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Aerospace Engineering 2006-05-01

2006-05-01
Materials mature The growth of air travel has always been dependent on the development of materials technology for structures and engines. Keeping track of production Aircraft manufacturers are making greater use of RFID and bar code technology, while also using new software that helps them keep production lines running smoothly. Breaking records via fuel management Onboard sensors reported lower-than-expectedfuel-tank readings not far into the around-the-world flight of the GlobalFlyer, jeopardizing the entire mission.
Book

Wireless Positioning Technologies and Applications

2008-01-01
At last—here’s a comprehensive book that puts full details on all short-range wireless-positioning methods at your command for instant access and use. This one-stop resource surveys each technique’s theory of operation, advantages and disadvantages, applicability in different domains, implementation procedures, and accuracy to help you select the right technology for any application and ensure the best results possible. Real-life examples together with 161 diagrams help bring all options into sharp focus. After introducing wireless positioning fundamentals along with various personal, commercial, and industrial applications, the book guides you step by step through radio signal time of flight methods, the signal strength method, the angle of arrival system, and the geometric use of distance measurement to determine location. It discusses location awareness applications and implementations using cellular networks.
Book

RFID Design Principles, Second Edition

2012-01-01
This revised edition of the Artech House bestseller, RFID Design Principles, serves as an up-to-date and comprehensive introduction to the subject. The second edition features numerous updates and brand new and expanded material on emerging topics such as the medical applications of RFID and new ethical challenges in the field. This practical book offers you a detailed understanding of RFID design essentials, key applications, and important management issues. The book explores the role of RFID technology in supply chain management, intelligent building design, transportation systems, military applications, and numerous other applications. It explains the design of RFID circuits, antennas, interfaces, data encoding schemes, and complete systems. Starting with the basics of RF and microwave propagation, you learn about major system components including tags and readers.
Magazine

Automotive Engineering International 2000-10-01

2000-10-01
Speed is king Motorsports offers automakers a fast way to develop new technologies and quick-thinking engineers. This article explores how DaimlerChrysler, Ford, and General Motors approach motorsports as an engineering tool. Electronics: changing the shape of the automobile The decisions made by the automotive industry the next few years will forever change the shape of the automobile. The electronic technologies to improve fuel economy, increase passenger safety, lower emissions, and improve reliability are evolving quickly, but because of their cost the exact timeframe for their implementation is undecided. Chevrolet Corvette The Z06 is the big news for 2001, the new model having a high-output 5.7-L LS6 V8 developed by GM Powertrain. Innovation meets the mid-size segment The 2001 Chrysler Sebring and Dodge Stratus offer more power, enhanced NVH characteristics, and improved safety. Third-generation M3 The all-new high-performance M3 coupe debuts in North America.
Book

Microelectronics Failure Analysis, Sixth Ed.

2011-10-01
This updated reference book, prepared by experts in their fields, contains dozens of articles covering a wide range of topics involving the failure analysis of microelectronics. It places the most important and up-to-date information on this subject at your fingertips.
Video

RFID on Aircraft Parts - Industry Initiatives, Testing Standards, and Best Practices for Storing Maintenance History Information Directly on Aircraft Parts

2012-03-22
The aerospace industry has long sought a solution for storing maintenance history information directly on aircraft parts. In 2005 leading airframe manufacturers determined that passive Radio Frequency Identification (RFID) technology presented a unique opportunity to address this industry need. Through the efforts of the Air Transport Association (ATA) RFID on Parts Committee and SAE International testing standards and data specifications are in place to support the broad adoption of passive RFID for storing parts history information directly on aircraft parts. The primary focus of the paper will be on the SAE AS-5678 environmental testing standard for passive RFID tags intended for aircraft use. Detail will be provided to help aerospace manufacturers understand their role and responsibilities for current programs and understand how this may impact their parts certification process.
Video

Detecting Damage and Damage Location on Large Composite Parts using RFID Technology

2012-03-16
Probabilistic methods are used in calculating composite part design factors for, and are intended to conservatively compensate for worst case impact to composite parts used on space and aerospace vehicles. The current method to investigate impact damage of composite parts is visual based upon observation of an indentation. A more reliable and accurate determinant of impact damage is to measure impact energy. RF impact sensors can be used to gather data to establish an impact damage benchmark for deterministic design criteria that will reduce material applied to composite parts to compensate for uncertainties resulting from observed impact damage. Once the benchmark has been established, RF impact sensors will be applied to composite parts throughout their life-cycle to alert and identify the location of impact damage that exceeds the maximum established benchmark for impact.
Technical Paper

New Acoustic Test Facilities of BMW

1985-05-15
850992
BMW has introduced new test stands for noise measurements on passenger cars and motorcycles. Information is given on room conditions, machinery equipment, sound levels, frequency ranges and types of measurement. The semi-anechoic room is designed for measuring the sound distribution emitted by a single vehicle. Road influence is simulated by a reflecting floor and a roller-dynamometer. The free field sound distribution in terms of distance and direction is measured in the anechoic room. This room has high-precision installations for sound source identification and noise mapping. The reverberation room serves to measure sound power emitted by the test object. Its second purpose is to subject the bodywork to a high-power external sound source and to measure the sound-deadening effect of the passenger compartment. In conclusion, the presentation provides reports on the initial experience with these test facilities.
Technical Paper

Simulation Methods for Evaluating Passenger Car Ride Comfort and the Fatigue Strength of Vehicle Components

1982-02-01
820095
A road simulation method has been developed to investigate ride comfort and fatique strength in the laboratory. A short description is given of the road profile generation technique used. The road to be simulated is recorded by driving the vehicle on the road and measuring the vertical accelerations and the forces of each spindle. In the laboratory the transfer behavior of the vehicle is determined with the aid of an identification technique. An iteration process is used. The simulation of the road profile and the forces is realised in the laboratory with multi-channel electrohydraulic equipments. Laboratory test results are shown and compared with road signals.
Technical Paper

Corrosion Failures in Semiconductor Devices and Electronic Systems

1983-12-05
831830
The automotive environment with its wide range of temperatures and corrosive liquids and gases provides a harsh environment for electronic systems. This situation is further compounded by the fact that these systems are composed of a wide variety of dissimilar materials. It should be no surprise, therefore, that corrosion can be a significant problem in electronic systems. This paper will discuss corrosion problems related to the following: open circuits in connector contacts, leakage and shorts on printed circuit boards, metal migration problems, and corrosion problems in plastic encapsulated semiconductor devices. In many of these corrosion situations, the initial mechanism involved in the corrosion process will often cause an electronic system to malfunction. It is, therefore, of utmost importance that these corrosion mechanisms be carefully evaluated during the development of electronic systems so that necessary steps can be taken to prevent their occurrence.
Technical Paper

Short Test Results on 1980 and 1981 Passenger Cars from the Arizona Inspection and Maintenance Program

1983-08-08
831209
This paper presents the results of a study which examined short test results and repair data on 1980 (GM vehicles only) and 1981 (all makes) model year passenger cars participating in the Arizona Inspection and Maintenance (I/M) program. The primary purpose of the study was to gather information on the failure rates of these vehicles using the Arizona short test, their mean emission levels, and the types of repairs performed on the failing cars. A unique part of the study was that a generalized software system was developed to extract very specific emission control information from the vehicle identification numbers (VIN's) for these vehicles. The results of the study indicate that in general these vehicles have quite low failure rates in comparison with pre-1980 vehicles, and that certain vehicles have a higher probability of failing the short test than others.
Technical Paper

Radio System Noise Suppression Measurements

1984-02-01
840165
Ford Motor Company is pursuing quantitative techniques in the identification and resolution of entertainment system electromagnetic interference (EMI). A radio frequency (RF) anechoic chamber provides shielding from external electromagnetic noise sources and minimizes measurement errors due to voltage standing waves in the room at high frequencies. Computerized radio frequency measuring equipment provides reports summarizing vehicle radiated emission data, tests data relative to radio system RF noise tolerance limits and documents emission attenuation following addition of EMI shielding and/or filtering.
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