Posts Tagged ATI
Do You Get Shaken and Stirred with MIL-STD-810G?
Posted by Markutus in Defense, Including Radar, Missiles and EW on September 29, 2011
Negative Stiffness Vibration Isolator
This four-day class will provide education in the purpose of each test, the equipment required to perform each test, and the methodology to correctly apply the specified test environments. Vibration and Shock methods will be covered together and will include an overview of Sine and Random Vibration as well as classical waveform shock testing, drop testing and Shock Response Spectrum Testing. Instrumentation, vibration equipment, control systems and fixture design will be covered.
Each climatic test will be discussed individually, focusing on requirements, origination, equipment required, test methodology and understanding of results. Class members will participate in a tour of a lab that daily performs the full spectrum of 810G tests. Class discussion will be supported by projected visuals and video clips.
Commencing with a review of basic vibrations, we will explore vibration measurements and analysis. We’ll compare sinusoidal vs. random vibration testing systems, specifications, standards and procedures. We will emphasize vibration and shock test fixture design, fabrication, experimental evaluation and usage. We will study shock measurement, shock response spectrum (SRS) and shock testing.
Climatic testing will be looked at in great detail, emphasizing required equipment and instrumentation, correct interpretation of specifications and hints to ensure that the tests are brought to a successful conclusion. We laboratory test the protected equipment (1) to assure twenty years equipment survival and possible combat, also (2) to meet commercial test standards, IEC documents, military standards such as STANAG or MIL-STD-810G, etc.
What you will learn:
• perform vibration, shock and climatic tests
• evaluate and select equipment to perform testing
• convert field measured data into a test program,
• interpret vibration and shock test requirements and results,
• supervise vibration, shock and climatic tests,
• specify and experimentally evaluate vibration and shock test fixtures
When you visit a test lab or review a test program, you will have a good understanding of the requirements and execution of dynamics and climatics tests and so be able to ask meaningful questions and understand laboratory personnel responses.
If you are in need of more technical training, then boost your career with the knowledge needed to provide better, faster, and cheaper solutions for sophisticated DoD and NASA systems. Why not take a short course instead?
ATI short courses are less than a week long and are designed to help you keep your professional knowledge up-to-date. Our courses provide a practical overview of space and defense technologies which provide a strong foundation for understanding the issues that must be confronted in the use, regulation and development of complex systems.
Course Outline, Samplers, and Notes
After attending the course you will receive a full set of detailed notes from the class for future reference, as well as a certificate of completion. Each participant will also receive a copy of Wayne Tustin’s text ‘A Minimal-Mathematics Introduction to the Fundamentals of Random Vibration and Shock Testing, HALT, ESS & HASS, also Measurements, Analysis & Calibration’, including a CD containing a number of video clips pertaining to sine and random vibration and shock behavior and testing.
Please visit our website for more valuable information.
About ATI and the Instructor
Our mission here at ATI is to provide expert training and the highest quality professional development in space, communications, defense, sonar, radar, and signal processing. We are not a one-size-fits-all educational facility. Our short classes include both introductory and advanced courses. ATI’s instructors are world-class experts who are the best in the business. They are carefully selected for their ability to clearly explain advanced technology.
Steve Brenner has been working in the field of environmental simulation and reliability testing for over 30 years. Beginning in the late sixties with reliability and design verification testing on the Lunar Module, the Space Shuttle in the eighties, to semiconductor manufacturing equipment in the nineties, Mr. Brenner has always been involved with the latest techniques for verifying equipment integrity through testing.
Mr. Brenner began his career as an Environmental test engineer with Grumman Aerospace Corporation in New York, worked as design verification and reliability engineer for the Air Force, an Environmental Test Engineer for Lockheed Missiles and Space company, and spent 18 years with Kaiser Electronics in San Jose, where he managed the Environmental Test Lab and was involved with the design of hardware intended for severe environments. Mr. Brenner has been working as a consultant in the reliability testing field since 1996.
Times, Dates, and Locations
For the times, dates and locations of all of our short courses, please access the links below.
Nov 1-4, 2011 Cincinnatti, OH
Nov 14-17, 2011 Jupiter, FL
Dec 5-8, 2011 Santa Clarita, CA
Do You Resonate with Shock, Noise and Vibration?
Posted by Markutus in Acoustics & Sonar, ENGINEERING, Uncategorized on July 19, 2011
Negative Stiffness Vibration Isolator
Two Short Courses from ATI on Vibration, Shock or Noise
in Vehicles, Devices, and Equipment
If you are concerned with vibration, shock or noise in vehicles, devices, and equipment; then Applied Technology Institute (ATI) short courses maybe for you.
Why not take a short course?
Our short courses are less than a week long and are designed to help you keep your professional knowledge up-to-date. They provide a practical overview of space and defense technologies which furnish a strong foundation for understanding the issues that must be confronted in the use, regulation and development of complex systems.
If you are test personnel who conduct or supervise or “contract out” vibration and shock tests, then take the three-day course fundamentals course. It also benefits design, quality and reliability specialists who interface with vibration and shock test activities.
If you have some prior acquaintance with vibration or noise fields, then you should sign up for the more advanced four day course. It emphasizes understanding of the relevant phenomena and concepts in order to enable the participants to address a wide range of practical problems insightfully.
See sections below for more details on these two short courses from ATI.
FUNDAMENTALS OF RANDOM VIBRATION & SHOCK TESTING
This three-day course is primarily designed for test personnel who conduct or supervise or “contract out” vibration and shock tests. It also benefits design, quality and reliability specialists who interface with vibration and shock test activities.
From this course you will obtain the ability to understand and communicate meaningfully with test personnel, perform basic engineering calculations and evaluate tradeoffs between test equipments’ and procedures.
Each student receives the instructor’s brand new, minimal-mathematics, minimal-theory hardbound text Random Vibration & Shock Testing, Measurement, Analysis & Calibration. This 444 page, 4-color book also includes a CDROM with video clips and animations.
What you will learn:
• How to plan, conduct and evaluate vibration and shock tests and screens.
• How to attack vibration and noise problems.
• How to make vibration isolation, damping and absorbers work for vibration and noise control.
• How noise is generated and radiated, and how it can be reduced.
This course is intended for engineers and scientists concerned with the vibration reduction and quieting of vehicles, devices, and equipment. The course will provide guidance relevant to design, problem solving, and development of improvements.
It will emphasize understanding of the relevant phenomena and concepts in order to enable the participants to address a wide range of practical problems insightfully. The instructors will draw on their extensive experience to illustrate the subject matter with examples related to the participant’s specific areas of interest.
Although the course will begin with a review and will include some demonstrations, participants ideally should have some prior acquaintance with vibration or noise fields. Each participant will receive a complete set of course notes and the text Noise and Vibration Control Engineering, a $210 value.
What you will learn:
How to attack vibration and noise problems
What means are available for vibration and noise control?
How to make vibration isolation, damping, and absorbers work
How noise generated and radiated, and how it can be reduced?
Course Outline, Samplers, and Notes
Determine for yourself the value of these courses before you sign up.
• Fundamentals of Random Vibration & Shock Testing course slide sampler
• Vibration & Noise Control course slide sampler
Our other short courses are designed for individuals involved in planning, designing, building, launching, and operating space and defense systems. See our samples (See Slide Samples) on some of our courses.
Or check out the new ATI channel on YouTube.
After attending a course you will receive a full set of detailed notes from the class for future reference, as well as a certificate of completion. Please visit our website for more valuable information.
About ATI and the Instructors
Since 1984, ATI has provided leading-edge public courses and onsite technical training to DoD and NASA personnel, as well as contractors. Whether you are a busy engineer, a technical expert or a project manager, you can enhance your understanding of complex systems in a short time. You will become aware of the basic vocabulary essential to interact meaningfully with your colleagues.
Our mission here at ATI is to provide expert training and the highest quality professional development in space, communications, defense, sonar, radar, and signal processing. We are not a one-size-fits-all educational facility. Our short classes include both introductory and advanced courses.
ATI’s instructors are world-class experts who are the best in the business. They are carefully selected for their ability to clearly explain advanced technology.
Fundamentals of Random Vibration & Shock Testing course
Wayne Tustin has since 1995 been president of a specialized engineering school and consultancy he founded in Santa Barbara, CA. His BSEE degree is from the University of Washington, Seattle. He is a licensed Professional Engineer – Quality in the State of California. Wayne’s first encounter with vibration was at Boeing/Seattle, performing what later came to be called modal tests, on the XB-52 prototype of that highly reliable platform. Subsequently he headed field service and technical training for a manufacturer of electrodynamic shakers, before establishing another specialized school on which he left his name. Wayne has written several books and literally hundreds of articles dealing with practical aspects of vibration and shock measurement and testing.
Vibration & Noise Control course
Dr. Eric Ungar has specialized in research and consulting in vibration and noise for more than 40 years, published over 200 technical papers, and translated and revised Structure-Borne Sound. He has led short courses at the Pennsylvania State University for over 25 years and has presented numerous seminars worldwide. Dr. Ungar has served as President of the Acoustical Society of America, as President of the Institute of Noise Control Engineering, and as Chairman of the Design Engineering Division of the American Society of Mechanical Engineers. ASME honored him with its Trent-Crede Medal in Shock and Vibration. ASA awarded him the Per Bruel Gold Medal for Noise Control and Acoustics for his work on vibrations of complex structures, structural damping, and isolation.
Dr. James Moore has, for the past twenty years, concentrated on the transmission of noise and vibration in complex structures, on improvements of noise and vibration control methods, and on the enhancement of sound quality. He has developed Statistical Energy Analysis models for the investigation of vibrations and noise complex structures as submarines, helicopters, and automobiles and has been instrumental in the acquisition of corresponding data bases. He has participated in the development of active noise control systems, noise reduction coating and signal conditioning means, as well as in the presentation of numerous short courses and industrial training programs.
Times, Dates, and Locations
Fundamentals of Random Vibration & Shock Testing
Sep 20-22, 2011 Detroit, MI
Oct 4-6, 2011 Santa Clarita, CA
Nov 7-9, 2011 Acton, MA
Vibration & Noise Control
Sep 26-29, 2011 Boston, MA
Mar 12-15, 2012 Columbia, MD
Apr 30-May 3, 2012 Boston, MA
Drone Fleets: The Countries That Possess Them And Potential For Robotic Wars
Posted by Val in Unmanned Aerial Systems (UAS) or Unmanned Aerial Vehicles (UAV), unmanned aircraft systems (UAS) on July 5, 2011
Despite some pretty disturbing news on UAV developments that are coming from China and a group of other countries U.S. remains the global leader in development, production and most importantly successful implementation of unmanned aircraft vehicles or drones. However, there is a lot of speculation regarding the world’s expanding drone fleets and their potential for reducing the threshold for going to war. Here is a list of known facts regarding this sensitive issue.
- USA is the main developer and manufacturer (however not exporter) of UAVs. Near the top of the line, the Predator B, or MQ9-Reaper, manufactured by General Atomics Aeronautical Systems, costs about $10.5 million. By comparison, a single F-22 fighter jet costs about $150 million.
The new smaller models are currently developed.
- Raytheon Missile Systems is in process of designing a 13lb Small Tactical Munition to be carried by smaller unmanned aircraft like Shadow, TigerShark, Hunter and Viking. The device is around 24 inches long and 4 inches around.
- Northrop Grumman has come out with the Viper Strike, a gliding,GPS-aided laser-guided variant of the Northrop Grumman Brilliant Anti-Tank (BAT) munition which originally had a combinationacoustic and IR seeker. The Viper Strike is 36 inches long and only 5.5 inches in diameter.
- Lockheed Martin has releasedthe Scorpion (21.5 inches in length, and 4.25 inches in diameter),which is adaptable to multiple launch platforms, including manned or unmanned systems.
- China is constantly increasing it’s development and production as well as export of drones. At the most recent Zhuhai air show they revealed WJ-600 drone and than two dozen other Chinese models. Little is known about their actual abilities but the speed at which they have been developed highlights how U.S. military successes with drones have changed strategic thinking worldwide and spurred a global rush for unmanned aircraft.
- Israel, the second-largest drone manufacturer after the United States, has flown armed models, but few details are available.
- India announced this year that it is developing ones that will fire missiles and fly at 30,000 feet.
- Russia has shown models of drones with weapons, but there is little evidence that they are operational.
- Pakistan has said it plans to obtain armed drones from China, which has already sold the nation ones for surveillance.
- Iran last summer unveiled a drone that Iranian President Mahmoud Ahmadinejad called the “ambassador of death” but whose effectiveness is still unproven, according to military analysts.
China’s drone technology hasn’t reached the world’s first-class level, but the Chinese are catching up quickly. This is something we know for sure.
Did You “Hear” About the Underwater Acoustical Courses at ATI?
Posted by admin in Acoustics & Sonar on June 24, 2011
Acoustic simulation in a simple ocean environment
Video Clip: Click to Watch
Maybe Being “Underwater” is a Good Thing?
Since 1984, the Applied Technology Institute (ATI) has provided leading-edge public courses and onsite technical training. Whether you are a busy engineer, a technical expert or a project manager, you can enhance your understanding of complex acoustical systems in a short time.
Why not take a short course? ATI short courses are less than a week long and are designed to help you keep your professional knowledge up-to-date. Our courses provide a practical overview of acoustical technologies which provide a strong foundation for understanding the issues that must be confronted in the use, design and development of such complex systems.
The three courses below present the fundamentals of underwater acoustic analysis and modeling, which deals with the translation of our physical understanding of sound in the sea into mathematical formulas solvable by computers. The courses provide a comprehensive treatment of all types of underwater acoustic models including environmental, propagation, noise, reverberation and sonar performance models.
ATI’S UNDERWATER ACOUSTIC SYSTEM ANALYSIS COURSE
This four-day course is based upon the text Underwater Acoustic System Analysis by William Burdic. The course presents the fundamentals of underwater acoustics, acoustic signal generation and acoustic signal processing in sufficient depth to permit the analysis and optimization of the performance of underwater systems. The sonar systems include a variety of applications including active and passive detection of surface and sub-surface targets, acoustic communications, acoustic intercept and underwater depth sounders. The course will stress the required skills and techniques for system analysis and performance prediction.
Course Outline:
• Introduction to Sonar Analysis: Historical overview; important acoustical properties and characteristics; Acoustical Waves; Reflections and Refraction in the Ocean; Units and db.
• Sound Propagation In The Ocean: Sound Speed Variation in the ocean with variation in temperature, depth, salinity; Geographic Variation; Acoustic bottom and surface losses; absorption losses; Typical propagation modes; surface layer; shallow channels; deep channels; convergence zones; RAP; Typical Propagation Curves.
• Ambient Noise in the Ocean: Sources of noise; shipping; wind generated; thermal; others; Noise spectra; ambient noise angular distribution and correlation properties; use of the spatial correlation function in system calculations.
• Target Characteristics: Passive signature sources including propulsion, propeller, auxiliary machinery, flow-induced noise; effect of self-generated noise on sonar performance; Target strength for mono-static and bi-static sonars; Reverberation from volume, surface and bottom.
• Acoustic Transducers: Definitions, piezo-ceramic properties; Hydrophone configurations; equivalent circuits and sensitivity; Projector configurations, equivalent circuits, efficiency and operation.
• Beamforming-Spatial Filtering: Purpose and types of beamforming; spatial filters, multi-element arrays, array shading functions; beam steering; gain of arrays in distributed noise; angle estimation.
• Performance Analysis-Statistical Basis: Hypothesis testing and optimum detection processors for active and passive systems; ROC curves; Estimation of time delay, frequency and bearing.
• Performance Analysis: Practical examples; Examples illustrating the analysis of sonar systems; passive narrowband and broadband detection; passive angle tracking and ranging; High-power system detection for multipath reverberation and noise-limited conditions with Doppler Processing.
Your Instructors for this Course:
William Burdic received his BS and MS at Oregon State University. He served as an instructor in the Department of Electrical Engineering, Oregon State University when he joined Rockwell International. He has been engaged in the analysis and design of advanced radar and sonar systems. He is the author of two books “Radar Signal Analysis” and “Underwater Acoustic System Analysis”.
James W. Jenkins joined the Johns Hopkins University Applied Physics Laboratory in 1970 and has worked in ASW and sonar systems analysis. He has worked with system studies and at-sea testing with passive and active systems. He is currently a senior physicist investigating improved signal processing systems, APB, own-ship monitoring, and SSBN sonar. He has taught sonar and continuing education courses since 1977 and is the Director of the Applied Technology Institute (ATI).
ATI’S UNDERWATER ACOUSTICS 201 COURSE
This two-day course explains how to translate our physical understanding of sound in the sea into mathematical formulas solvable by computers. It provides a comprehensive treatment of all types of underwater acoustic models including environmental, propagation, noise, reverberation and sonar performance models.
Specific examples of each type of model are discussed to illustrate model formulations, assumptions and algorithm efficiency. Guidelines for selecting and using available propagation, noise and reverberation models are highlighted.
Demonstrations illustrate the proper execution and interpretation of PC-based sonar models. Each student will receive a copy of Underwater Acoustic Modeling and Simulation by Paul C. Etter, in addition to a complete set of lecture notes.
Your Instructor for this Course:
Paul C. Etter has worked in the fields of ocean-atmosphere physics and environmental acoustics for the past thirty-five years supporting federal and state agencies, academia and private industry. He received his BS degree in Physics and his MS degree in Oceanography at Texas A&M University. Mr. Etter served on active duty in the U.S. Navy as an Anti-Submarine Warfare (ASW) Officer aboard frigates. He is the author or co-author of more than 180 technical reports and professional papers addressing environmental measurement technology, underwater acoustics and physical oceanography. Mr. Etter is the author of the textbook Underwater Acoustic Modeling and Simulation (3rd edition).
Course Outline:
• Introduction. Nature of acoustical measurements and prediction. Modern developments in physical and mathematical modeling. Diagnostic versus prognostic applications. Latest developments in inverse-acoustic sensing of the oceans.
• The Ocean as an Acoustic Medium. Distribution of physical and chemical properties in the oceans. Sound-speed calculation, measurement and distribution. Surface and bottom boundary conditions. Effects of circulation patterns, fronts, eddies and fine-scale features on acoustics. Biological effects.
• Propagation. Basic concepts, boundary interactions, attenuation and absorption. Ducting phenomena including surface ducts, sound channels, convergence zones, shallow-water ducts and Arctic half-channels. Theoretical basis for propagation modeling. Frequency-domain wave equation formulations including ray theory, normal mode, multipath expansion, fast field (wavenumber integration) and parabolic approximation techniques. Model summary tables. Data support requirements. Specific examples.
• Noise. Noise sources and spectra. Depth dependence and directionality. Slope-conversion effects. Theoretical basis for noise modeling. Ambient noise and beam-noise statistics models. Pathological features arising from inappropriate assumptions. Model summary tables. Data support requirements. Specific examples.
• Reverberation. Volume and boundary scattering. Shallow-water and under-ice reverberation features. Theoretical basis for reverberation modeling. Cell scattering and point scattering techniques. Bistatic reverberation formulations and operational restrictions. Model summary tables. Data support requirements. Specific examples.
• Sonar Performance Models. Sonar equations. Monostatic and bistatic geometries. Model operating systems. Model summary tables. Data support requirements. Sources of oceanographic and acoustic data. Specific examples.
• Simulation. Review of simulation theory including advanced methodologies and infrastructure tools.
• Demonstrations. Guided demonstrations illustrate proper execution and interpretation of PC-based monostatic and bistatic sonar models.
ATI’S UNDERWATER ACOUSTIC MODELING AND SIMULATION COURSE
The subject of underwater acoustic modeling deals with the translation of our physical understanding of sound in the sea into mathematical formulas solvable by computers. This course provides a comprehensive treatment of all types of underwater acoustic models including environmental, propagation, noise, reverberation and sonar performance models.
Specific examples of each type of model are discussed to illustrate model formulations, assumptions and algorithm efficiency. Guidelines for selecting and using available propagation, noise and reverberation models are highlighted. Problem sessions allow students to exercise PC-based propagation and active sonar models.
Each student will receive a copy of Underwater Acoustic Modeling and Simulation by Paul C. Etter (a $250 value) in addition to a complete set of lecture notes.
View course sample for this course
Your Instructor for this Course:
Paul C. Etter has worked in the fields of ocean-atmosphere physics and environmental acoustics for the past thirty years supporting federal and state agencies, academia and private industry. He received his BS degree in Physics and his MS degree in Oceanography at Texas A&M University. Mr. Etter served on active duty in the U.S. Navy as an Anti-Submarine Warfare (ASW) Officer aboard frigates. He is the author or co-author of more than 140 technical reports and professional papers addressing environmental measurement technology, underwater acoustics and physical oceanography. Mr. Etter is the author of the textbook Underwater Acoustic Modeling and Simulation.
Course Outline:
• Introduction. Nature of acoustical measurements and prediction. Modern developments in physical and mathematical modeling. Diagnostic versus prognostic applications. Latest developments in acoustic sensing of the oceans.
• The Ocean as an Acoustic Medium. Distribution of physical and chemical properties in the oceans. Sound-speed calculation, measurement and distribution. Surface and bottom boundary conditions. Effects of circulation patterns, fronts, eddy and fine-scale features on acoustics. Biological effects.
• Propagation. Observations and Physical Models. Basic concepts, boundary interactions, attenuation and absorption. Shear-wave effects in the sea floor and ice cover. Ducting phenomena including surface ducts, sound channels, convergence zones, shallow-water ducts and Arctic half-channels. Spatial and temporal coherence. Mathematical Models. Theoretical basis for propagation modeling. Frequency-domain wave equation formulations including ray theory, normal mode, multipath expansion, fast field and parabolic approximation techniques. New developments in shallow-water and under-ice models. Domains of applicability. Model summary tables. Data support requirements. Specific examples (PE and RAYMODE). References. Demonstrations.
• Noise. Observations and Physical Models. Noise sources and spectra. Depth dependence and directionality. Slope-conversion effects. Mathematical Models. Theoretical basis for noise modeling. Ambient noise and beam-noise statistics models. Pathological features arising from inappropriate assumptions. Model summary tables. Data support requirements. Specific example (RANDI-III). References.
• Reverberation. Observations and Physical Models. Volume and boundary scattering. Shallow-water and under-ice reverberation features. Mathematical Models. Theoretical basis for reverberation modeling. Cell scattering and point scattering techniques. Bistatic reverberation formulations and operational restrictions. Data support requirements. Specific examples (REVMOD and Bistatic Acoustic Model). References.
• Sonar Performance Models. Sonar equations. Model operating systems. Model summary tables. Data support requirements. Sources of oceanographic and acoustic data. Specific examples (NISSM and Generic Sonar Model). References.
• Modeling and Simulation. Review of simulation theory including advanced methodologies and infrastructure tools. Overview of engineering, engagement, mission and theater level models. Discussion of applications in concept evaluation, training and resource allocation.
• Modern Applications in Shallow Water and Inverse Acoustic Sensing. Stochastic modeling, broadband and time-domain modeling techniques, matched field processing, acoustic tomography, coupled ocean-acoustic modeling, 3D modeling, and chaotic metrics.
• Model Evaluation. Guidelines for model evaluation and documentation. Analytical benchmark solutions. Theoretical and operational limitations. Verification, validation and accreditation. Examples.
• Demonstrations and Problem Sessions. Demonstration of PC-based propagation and active sonar models. Hands-on problem sessions and discussion of results.
ATI Releases New Radar Systems Analysis & Design Using MATLAB Technical Training Short Course Sampler
Posted by Val in & SIGNAL PROCESSING, Defense, Including Radar, Missiles and EW, ENGINEERING on March 15, 2011
On March 15, 2011 ATI released new Radar Systems Analysis & Design Using MATLAB technical training short course sampler.
- This course provides a comprehensive description of radar systems analyses and design. A design case study is introduced and as the material coverage progresses throughout the course, and new theory is presented, requirements for this design case study are changed and / or updated, and the design level of complexity is also increased. This design process is supported with a comprehensive set of MATLAB-7 code developed for this purpose. By the end, a comprehensive design case study is accomplished. This will serve as a valuable tool to radar engineers in helping them understand radar systems design process. Each student will receive the instructor’s textbook MATLAB Simulations for Radar Systems Design as well as course notes.
- The course is scheduled to be presented on May 2-5, 2011 in Columbia, MD. Register here.
ATI Releases new Radar Signal Analysis and Processing using MATLAB Technical Training Short Course Sampler
Posted by Val in & SIGNAL PROCESSING, Defense, Including Radar, Missiles and EW, ENGINEERING on March 15, 2011
On March 16, 2011 ATI released new Radar Signal Analysis and Processing using MATLAB technical training short course sampler.
- This three-day course develops the technical background needed to predict and understand the factors controlling the performance of radar systems including anti-clutter and anti-jamming signal processing techniques.The course introduces the fundamental concepts and properties of various techniques without the necessity of a detailed analytic background.
The course is scheduled to be presented on July 13-15, 2011 in Laurel, MD. Register here.
ATI Releases Grounding & Shielding for EMC Technical Training Short Course Sampler
Posted by Val in Defense, Including Radar, Missiles and EW, ENGINEERING on March 15, 2011
On March 15, 2011 ATI released Grounding & Shielding for EMC technical training short course sampler.
- This three-day course is designed for technicians, operators, and engineers who need an understanding of all facets of grounding and shielding at the circuit, PCB, box or equipment level, cable-interconnected boxes (subsystem), system and building, facilities or vehicle levels. The course offers a discussion of the qualitative techniques for EMI control through grounding and shielding at all levels. It provides for selection of EMI suppression methods via math modeling and graphics of grounding and shielding parameters.Our instructor will use computer software to provide real world examples and case histories. The computer software simulates and demonstrates various concepts and helps bridge the gap between theory and the real world. The computer software will be made available to the attendees. One of the computer programs is used to design interconnecting equipments. This program demonstrates the impact of various grounding schemes and different “fixes” that are applied. Another computer program is used to design a shielded enclosure. The program considers the box material; seams and gaskets; cooling and viewing apertures; and various “fixes” that may be used for aperture protection. .
There are also hardware demonstrations of the effect of various compromises and resulting “fixes” on the shielding effectiveness of an enclosure. The compromises that are demonstrated are seam leakage, and a conductor penetrating the enclosure. The hardware demonstrations also include incorporating various “fixes” and illustrating their impact.
UFO Landing From Space Or Giant Ice Circles
On Tuesday, January 11, 2011 ATI staff noticed a change in our view of giant ice circles on the surface of Beards Creek in Riva, MD. Under a light cover of snow they looked even more surreal.
As we discussed in the previous post ice circles are a rare phenomenon and we at ATI feel privileged to have witnessed it.
ATI Staff witnesses mysterious ice circles on Beards Creek in Riva, MD
On Monday, January 10, 2011 ATI staff came in to work to discover that the view out of their windows has changed dramatically. One of the perks of working at Applied Technology Institute is the expansive views of the Beards Creek and South River. However, what we saw that morning was entirely different. The surface of the water was covered in large ice circles 4-6 ft. in diameter.
As it turns out, an ice disc, ice circle, or ice pan is a natural phenomenon that occurs in slow moving water in cold climates. Ice circles vary in size but have been reported to be more than 4 metres (13 ft) in diameter.
Ice discs form on the outer bends in a river where the accelerating water creates a force called ‘rotational shear’, which breaks off a chunk of ice and twists it around.[5] As the disc rotates, it grinds against surrounding ice — smoothing into a circle. A relatively uncommon phenomenon, one of the earliest recordings is of a slowly revolving disc was spotted on the Mianus River and reported in a 1895 edition of Scientific American.
River specialist and geography professor Joe Desloges states that ice pans are “surface slabs of ice that form in the center of a lake or creek, instead of along the water’s edge. As water cools, it releases heat that turns into frazil ice” that can cluster together into a pan-shaped formation. If an ice pan accumulates enough frazil ice and the current remains slow, the pan may transform into a ‘hanging dam’, a heavy block of ice with high ridges low centre.
Low Frequency Home Noise Continued – Another Expert Opinion – Understand How The Noise Is Getting Into The House
Posted by Jim in ENGINEERING, Underwater Acoustics and Sonar on March 6, 2010
See the previous post from Carolyn about low frequency noise in her home that bothers her sleep and living.
Jim,
There may be a question about how the noise is getting into the house, whether by airborne transmission of noise outside or ground borne vibration into the structure of the house with noise radiation due to floor/wall vibration. Carolyn said they hear the noise inside but not outside which would suggest that it is ground borne. Also, there are train tracks in the area that where the locomotives sit idling all night. These could be a source of both airborne noise and ground borne vibration at low frequencies. If the problem involves ground borne transmission then modifying the windows will not do much as the path does not involve transmission through the windows. Also, are the vibration at levels sufficient to be feelable by the inhabitants?
It would be good if measurements could be carried out to reliably determine whether the transmission is airborne or ground borne. At a minimum, measurements are needed to monitor actual levels of noise inside and outside the house to determine a frequency spectrum of the noise and to establish a correlation between outside and inside levels when the noise occurs. It would be good also to monitor floor or wall vibration levels along with ground vibration levels outside around the house. These measurements would quantify how the noise is getting into the house as a basis for deciding how best to approach reducing it.
The suggestion about adding a second pane to the windows should help if the transmission is airborne and the windows are the weak link in blocking transmission through the outer walls of the house – brick should be heavy enough for the solid walls, leaving the windows and possibly the doors. Dealing with ground borne transmission would be more complicated as decoupling the foundation and structure of the house from ground borne vibration transmission is not easy.
In non-engineering terms, have the people been in the house for a while?, is this a new problem that developed recently?? Your wondering about contacting someone in public administration about local noise standards is good. Also, are there neighbors with the same issues that could be brought into the pursuit of a solution? We often have community noise problems where a group of neighbors are involved in seeking solutions with the offending company, who is often willing to pursue a solution to maintain good community relations and may be willing to pay to develop a solution.
I would be willing to communicate or talk with Carolyn directly about the problem. We are consultants but would be willing to discuss things in a preliminary fashion.
Jim Moore
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