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Optimization of Multi-Layer Panel Constructions Using Experimental Modeling via Transfer Matrix Method

Bruel & Kjaer North America, Inc.-Edward Ray Green, John Anton
Published 2019-06-05 by SAE International in United States
In a previous paper [1], a method was introduced to predict the sound transmission loss (STL) performance of multi-layer panel constructions using a measurement-based transfer matrix method. The technique is unique because the characterization of the poro-elastic material is strictly measurement based and does not require modeling the material. In this paper, it is demonstrated how the technique is used to optimize the STL of lightweight, multi-layer panel constructions. Measured properties of several decoupler materials (shoddy and foam) are combined with sheet metal and barrier layers to find optimal combinations. The material properties are measured with the impedance tube per ASTM E2611 [2].
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Rethinking aluminum for NVH abatement

Automotive Engineering: June 2019

Lindsay Brooke
  • Magazine Article
  • 19AUTP06_01
Published 2019-06-01 by SAE International in United States

Engineers, abandon those mastics! New “quiet” materials solutions are at hand.

Engineers who have witnessed aluminum-intensive vehicles being “uncloaked” in a full competitive teardown relate the same story: After you've pulled the carpet out and stripped it down to the naked bodyshell, the “band-aids” are clearly exposed-typically on the floorpan, bulkheads, on the rear package tray of sedans, around the wheelhouses, and within the noise-critical dash panel and cowl plenum.

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Foam for NVH solutions

Automotive Engineering: June 2019

  • Magazine Article
  • 19AUTP06_05
Published 2019-06-01 by SAE International in United States

New innovations for a wide variety of sound-deadening applications.

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Experimental Investigation of Proton Exchange Membrane Fuel Cell with Metal Foam Flow Field

Tianjin University-Xu Xie, Xiaoyan Sun, Mengqian Zhu, Guobin Zhang, Kui Jiao
University of California - Davis-Siyuan Wu, Jae Wan Park
Published 2019-04-02 by SAE International in United States
Compared with conventional flow field, metal foam has been increasingly used for gas distributor in the PEM (proton exchange membrane) fuel cell due to its high porosity and conductivity, which significantly enhances the species transport under high current density condition. In this study, the cell performances with metal foam and graphite parallel flow field are compared under normal and subzero temperature conditions. Besides, electrochemical impedance spectroscopy (EIS) is recorded to characterize the Ohmic, polarization and polarization resistance. Under normal condition, the cell with metal foam exhibits three times better performance than the one with parallel flow field. Meanwhile, the effects of inlet gas humidity and flow rates on cell performance are also studied, indicating that the cathode flooding easily occurs due to its difficult water removal. However, the high flow rate can greatly ease the cathode water flooding. Under subzero temperature condition, metal foam cell shows higher startup voltage and better ice storage capability. In addition, the effects of start-up temperature and current density on cold start performance of PEM fuel cell are studied and…
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Adhesive, Contact Polychloroprene (CR) Rubber, Resin Modified

AMS P Polymeric Materials Committee
  • Aerospace Material Specification
  • AMS3704B
  • Current
Published 2019-03-28 by SAE International in United States
This specification covers a polychloroprene (CR) rubber, resin modified, solvent-type contact adhesive in the form of a liquid.
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The Application of Additive Manufacturing to the 2018 SAE Aero Design Challenge

North Carolina A&T State University-Nathan David Blake, Cynthia Waters, Simon Esau, John Kizito
Published 2019-03-19 by SAE International in United States
This project focuses on the application of polymer additive manufacturing to the 2018 SAE Aero Design Regular Class competition for North Carolina A&T State’s 2017/2018 senior project team. The Regular Class SAE Aero Design challenge requires participating teams to create a high lift, high efficiency remote controlled aircraft that is designed to carry as many passengers and additional cargo mass as possible while still being able to meet land and air performance requirements defined by the competition rules. Constraints set by the competition rules include material constraints, a max gross weight of 55 lb, a limited power supply of 1000 W, a 12-ft wingspan limitation, enclosed cargo and passenger bays, the ability to unload and load all cargo and return the plane to a flight ready configuration within 1 minute, and a takeoff distance of 200 ft. The wide use of additive manufacturing and hot wire foam cutting for this aircraft design has allowed for accurate and efficient component production, as well as increased design complexity compared to traditional manufacturing methods seen at competition. Most…
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X-Ray Study of Low-Density Materials

  • Magazine Article
  • TBMG-33903
Published 2019-03-01 by Tech Briefs Media Group in United States

It's hard to get an X-ray image of low-density material like tissue between bones because X-rays just pass right through like sunlight through a window. Sandia studies myriads of low-density materials, from laminate layers in airplane wings to foams and epoxies that cushion parts. So they borrowed and refined a technique from the medical field, X-ray phase contrast imaging, to look inside the softer side of things. The technique measures not just the number of X-ray photons that get through the sample, as in conventional X-ray imaging, but also the phase of the X-rays after they pass through, offering a complete look at interfaces inside a structure.

 

Nanoscale Pillars Act as Memory Foam

  • Magazine Article
  • TBMG-33936
Published 2019-03-01 by Tech Briefs Media Group in United States

A customizable nanomaterial was developed that combines metallic strength with a foam-like ability to compress and spring back. The material can store and release mechanical energy on the nanoscale, and fits into existing industrial semiconductor processes.

 

Investigation of Tyre Acoustic Cavity Mode Induced In-Cabin Noise

Apollo Tyres Ltd.,-Jaiganesh Subbian, Sankarganesh Padmanaban, Amarnath Skp
Published 2019-01-09 by SAE International in United States
In-cabin noise induced by tyre air cavity resonance is one of the major issues among other sources. Introducing foam in cavity or changing tyre cavity design is expensive and sometimes they may not solve the problem. Most of the cases the intended techniques are difficult to implement. There are several factors which can affect the tyre cavity resonance. In this work we have studied the effect of acoustic and structural coupling of tyre wheel assembly on tyre cavity resonance. The modal testing of tyre wheel assembly and rim reveals that wheel rim mode affects the tyre cavity resonance. Shifting wheel rim mode away from air cavity mode by using lighter wheel rim reduces the In-cabin noise due to air cavity resonance. Later air cavity resonance mechanism is simulated and verified with the modal test results. In-cabin noise due to air cavity resonance can be optimized by means of using this validated numerical simulation method in the early design stage of tyre development.
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Automotive Gear Lubricants for Commercial and Military Use

Fuels and Lubricants TC 3 Driveline and Chassis Lubrication
  • Ground Vehicle Standard
  • J2360_201901
  • Current
Published 2019-01-07 by SAE International in United States
The gear lubricants covered by this standard exceed American Petroleum Institute (API) Service Classification API GL-5 and are intended for hypoid-type, automotive gear units, operating under conditions of high-speed/shock load and low-speed/high-torque. These lubricants may be appropriate for other gear applications where the position of the shafts relative to each other and the type of gear flank contact involve a large percentage of sliding contact. Such applications typically require extreme pressure (EP) additives to prevent the adhesion and subsequent tearing away of material from the loaded gear flanks. These lubricants are not appropriate for the lubrication of worm gears. Appendix A is a mandatory part of this standard. The information contained in Appendix A is intended for the demonstration of compliance with the requirements of this standard and for listing on the Qualified Products List (QPL) administered by the Lubricant Review Institute (LRI). Appendix A contains a summary of key qualification requirements. A complete listing of qualification requirements and procedures can be found in the Program Document (PD4000) - Gear Lubricant Review Program - available…
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