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Reinforcement of Low-Frequency Sound by Using a Panel Speaker Attached to the Roof Panel of a Passenger Car

Hyundai Motor Company-Munhwan Cho
Korea Advanced Inst of Science & Tech-Ki-Ho Lee, Jeong-Guon Ih
  • Technical Paper
  • 2020-01-1570
To be published on 2020-06-03 by SAE International in United States
The woofer in a car should be large to cover the low frequencies, so it is heavy and needs an ample space to be installed in a passenger car. The geometry of the woofer should conform to the limited available space and layout in general. In many cases, the passengers feel that the low-frequency contents are not satisfactory although the speaker specification covers the low frequencies. In this work, a thin panel is installed between the roof liner and the roof panel, and it is used as the woofer. The vibration field is controlled by many small actuators to create the speaker and baffle zones to avoid the sound distortion due to the modal interaction. The generation of speaker and baffle zones follows the inverse vibro-acoustic rendering technique. In the actual implementation, a thin acrylic plate of 0.53ⅹ0.2 m2 is used as the radiator panel, and the control actuator array is composed of 16 moving-coil actuators. The shape of the desired speaker zone is an ellipse, and the required amplitude of this piston source is…
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In-situ studies on the effect of solar control glazings on in-cabin thermal environment for hot and humid climatic zones

Saint Gobain India Pvt., Ltd.-Jyothi Latha Tamalapakula
  • Technical Paper
  • 2020-01-1257
To be published on 2020-04-14 by SAE International in United States
Thermal comfort in a passenger cabin is the basic necessity of an occupant especially in hot and humid climatic conditions. It is known that the reflective glazing solutions provide better thermal comfort inside the cabin due to significant reflection of IR part of solar radiation. However, in hot and humid climatic zones like India, significant reduction in heat load can also be achieved through cost effective solar control absorbing glazings. Thus, the present work aims to study the effect of solar control absorbing glazings on cabin inside temperatures and its impact on thermal comfort of the occupants in tropical climates. A combination of glazing sets with a range of solar energy transmission and absorption values are considered for the study. Indoor soak and cool tests are performed on a sedan model with multiple sets of solar control absorbing glass combinations. A constant ambient temperature of 38˚C and solar radiation of 1000W/m2 are maintained throughout the tests. Wind speed was simulated for a vehicle running speed of 45kmph. Net heat gain inside the cabin as a…
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Durability Study of Automotive Additive Manufactured Specimens

Colorado Photopolymer Solutions-Amelia Davenport, Neil Cramer
Eastern Michigan University-Forough Zareanshahraki
  • Technical Paper
  • 2020-01-0957
To be published on 2020-04-14 by SAE International in United States
The long-term weathering behavior of three different 3D printable, non-stabilized, UV cure resin formulations (A and B with thiol-ene base, and C with acrylate chemistry) was studied using tensile testing, nano-indentation, and photoacoustic infrared (FTIR-PAS) spectroscopy. To this end, type I tensile bars were printed from each resin system using a 3D printer, and were post UV-cured under a broad spectrum source. Systems A and C showed a similar trend after weathering. They first experienced an increase in modulus and tensile strength, due to additional crosslinking of the residual unreacted species. This increase in mechanical properties was followed by a drop in modulus, tensile strength, and percent elongation, due to the over-crosslinking and consequent embrittlement. System B, however, showed remarkable retention of the mechanical properties before/after weathering. Nano-indentation results were in good agreement with the tensile properties, showing a similar trend in hardness variations. Although Systems A and C outperformed System B in photooxidation performance, all three systems demonstrated promising results considering no hindered amine light stabilizers (HALS) were used in the formulations. Both photooxidation…
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Equivalent damping added by Sound package

FCA US LLC-Dilal Rhazi, Kunal Mathur, Abhishek Nulkar
  • Technical Paper
  • 2020-01-1397
To be published on 2020-04-14 by SAE International in United States
In Automotive and Aerospace industries, sound package has an important role to help identify and control vehicle noise in order to improve passenger comfort and reduce environmental noise pollution. The well-known used approaches to model the sound package are Transfer Matrix Method (TMM) combined with Statistical Energy Analysis (SEA). The effect of sound package on the sound radiation can be summarized in three points. (i) Interact with the non-resonant response of the panel to modify the mass law. (ii) Act as a barrier and modify the radiation efficiency of the panel. (iii) Acts as a multilayer damping treatment on the panel. To the best of our knowledge, the equivalent damping due to the multilayer has not been done by earlier researchers and it's a novel approach. In this paper, an experimental study will be conducted to assess the add-on damping by sound package for different configurations. The decay rate method will be used to measure the damping indicator on a flat samples attached to acoustic treatments. Different parameters will be investigated such as: Nature of…
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Test Methods for Insulated Electric Wire

AE-8D Wire and Cable Committee
  • Aerospace Standard
  • AS4373F
  • Current
Published 2020-03-12 by SAE International in United States
This standard describes test methods for insulated, single conductor, electric wire intended for aerospace applications. Particular requirements for the wire being tested need to be specified in a procurement document or other detail specification. Suggested minimum requirements are included in the notes at the end of some of the test methods. SAE Performance Standard AS4372 uses some of the tests in this document for evaluating comparative performance of aerospace wires.
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Spectral Transmission Test

Glazing Materials Standards Committee
  • Ground Vehicle Standard
  • J1796_202003
  • Current
Published 2020-03-11 by SAE International in United States
The scope of this SAE performance standard is to define the test method by which the direct solar and visible transmittance of safety glazing materials for road vehicles shall be measured. Adherence to this performance standard will facilitate writing, use, and referencing of reports by government, industry, and other organizations.
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Human Health Risk Assessment of Space Radiation

University of Pittsburgh-Ashmita Rajkumar
  • Technical Paper
  • 2020-01-0020
Published 2020-03-10 by SAE International in United States
Mars has been the topic of colonization and discovery for the last few decades but there have been hindrances in implementing the mission. This focus on Mars colonization has only deepened after the discovery of water on its surface. The discovery of water on Mars has led researchers to believe that its sustainability of life is higher than any other uncolonized planet. Although, life can survive on Mars, it is highly unethical to send communities to Mars without acknowledging the risks, especially those concerning the well being of humans. The risks of living on Mars are slowly unraveling through extensive research, but it is evident that certain health care measures must be taken in order to prevent potentially fatal conditions. One of the biggest problems is health concerns that astronauts face after returning from Mars. Health problems in space have been increasingly difficult to deal with because of the lasting circumstances that astronauts suffer upon returning back to Earth. As a result of these issues, NASA has delayed its Mars mission to circa 2028. Another…
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Los Alamos High-Energy Neutron Testing Handbook

Honeywell Aerospace-Laura Dominik
Los Alamos National Laboratory-Steve Wender
  • Technical Paper
  • 2020-01-0054
Published 2020-03-10 by SAE International in United States
The purpose of the Los Alamos High-Energy Neutron Testing Handbook is to provide user information and guidelines for testing Integrated Circuits (IC) and electronic systems at the Irradiation of Chips and Electronics (ICE) Houses at the Los Alamos Neutron Science Center (LANSCE) at Los Alamos National Laboratory (LANL). Microelectronic technology is constantly advancing to higher density, faster devices and lower voltages. These factors may increase device susceptibility to radiation effects. The high-energy neutron source at LANSCE/LANL provides the capability for accelerated neutron testing of semiconductor devices and electronic systems and to simulate effects in various neutron environments.
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RAD-HARD Microelectronics for Space Applications

  • Magazine Article
  • TBMG-36071
Published 2020-02-01 by Tech Briefs Media Group in United States

For orbiting satellites, design requirements are extensive as a result of the extreme environment in space, including wide-ranging and rapidly changing temperatures, satellite body charging effects and high-energy particle bombardment and radiation. These dynamics drive the need for high-reliability engineering concepts for all system components. In the case of microelectronics, this takes a unique form and drives innovation for techniques to overcome these damaging effects.

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RAD-HARD Microelectronics for Space Applications

Aerospace & Defense Technology: February 2020

  • Magazine Article
  • 20AERP02_01
Published 2020-02-01 by SAE International in United States

For orbiting satellites, design requirements are extensive as a result of the extreme environment in space, including wide-ranging and rapidly changing temperatures, satellite body charging effects and high-energy particle bombardment and radiation. These dynamics drive the need for high-reliability engineering concepts for all system components. In the case of microelectronics, this takes a unique form and drives innovation for techniques to overcome these damaging effects.

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