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The benefits of using Composite Bearings in Aircraft Shock Absorbers

Trelleborg Sealing Solutions-Brian Bowen, Torben A. Andersen
  • Technical Paper
  • 2019-01-1898
To be published on 2019-09-16 by SAE International in United States
This paper will use actual examples from aircraft recently introduced into service, to describe the main advantages of changing from the currently used metallic bearings, to composite bearings. Abstract: The introduction of composite bearing in a recently introduced twin aisle aircraft has resulted in: • Weight saving, by replacing bronze bearings with plastic bearings • Lowering of the particle count in the shock absorber oil, (Reduced contamination with metal particles) leading to reduced wear on seals and bearings. Qualification testing showed that Composite Bearings are able to provide longer service life than bronze bearings.
 

The Szorenyi Three-Chamber Rotary Engine concept

Partner Rotary Engine Development Agency-Peter King
  • Technical Paper
  • 2019-24-0168
To be published on 2019-08-15 by SAE International in United States
Currently automotive engines are reciprocating or Wankel rotary engine types. Reciprocating engines are bulky, heavy and complex, mainly due to the intake and exhaust valves and their associated cam-­‐train. Wankel engines are rev limited due to the large eccentric load on the crankshaft, and have poor sealing of the apex seals leading to poor economy and undesirable emission gases. The Rotary Engine Development Agency (REDA) has designed a three­‐chamber rotary internal combustion engine concept using its patented Szorenyi Curve. It is an evolution of the four chamber engine design which was the subject of SAE Technical Paper 2017-­‐01-­‐2413 and SAE publication ‘So You Want to Design Engines: UAV Propulsion Systems’. This paper on the three­‐chamber engine concept includes an analysis of the major issues affecting the Wankel engine. The Wankel engine’s geometry results in excessive crankshaft deflection (due to the centrifugal force of the rotor which is eccentric to the crankshaft) and this limits its revs. However, the analysis in the paper reveals that the revs cannot be increased by increasing the diameter of the…
 
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Gland Design: Nominal 3/8 Inch Cross Section for Compression-Type Seals

A-5B Gears, Struts and Couplings Committee
  • Aerospace Standard
  • AS4832A
  • Current
Published 2019-06-17 by SAE International in United States

This SAE Aerospace Standard (AS) offers gland details for a 0.364 inch (9.246 mm) cross-section gland (nominal 3/8 inch) with proposed gland lengths for compression-type seals with two backup rings over a range of 7 to 21 inches (178 to 533 mm) in diameter.

 
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Cork and Rubber Composition Sheet; for Aromatic Fuel and Oil Resistant Gaskets

AMS CE Elastomers Committee
  • Aerospace Material Specification
  • AMSC6183B
  • Current
Published 2019-06-10 by SAE International in United States

This specification covers vulcanized sheet made of granulated cork uniformly dispersed in a synthetic rubber compound, for use in gaskets where aromatic fuel or oil resistance is required.

 
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Specification for O-Ring Face Seal Connectors: Part 1 - Tube Connection Details and Common Requirements for Performance and Tests

Hydraulic Tube Fittings Committee
  • Ground Vehicle Standard
  • J1453/1_201906
  • Current
Published 2019-06-06 by SAE International in United States

The three parts of SAE J1453 cover material, dimensional, and performance requirements of steel O-ring face seal (ORFS) connectors for tubing and the O-ring face seal interface and nut portion of hose stem assemblies for nominal tube diameters of 6 through 50 mm.

 
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Groove Design - Metal Face Seal

E-25 General Standards for Aerospace and Propulsion Systems
  • Aerospace Standard
  • AIR1108A
  • Current
Published 2019-06-06 by SAE International in United States

Groove designs presented herein are applicable for use with machined or formed metal seals which are similar in configuration to those shown in figure 3, which operate under internal pressure or in vacuum service and which have been specifically qualified or recommended by the purchaser or the manufacturer for use with this AIR. They are also applicable for use with metal o-rings (e.g., MS9142 MS9202 thru MS9205) where interchangeability with machined or formed metal seals is desired. For metal o-ring groove designs where interchangeability is not a requirement refer to ARP674.

 
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A Computational Process to Effectively Design Seals for Improved Wind Noise Performance

Dassault Systemes SIMULIA-Robert Powell, Sivapalan Senthooran, Philippe Moron
Jaguar Land Rover-Nicholas Oettle
Published 2019-06-05 by SAE International in United States
The ability to assess noise transmitted through seals to cabin interiors early in the design process is very important for automotive manufacturers. When a seal design is inadequate, the noise transmitted can dominate the interior noise, making the wind noise performance of the vehicle unacceptable. This can cause launch delays, increasing costs and risking loss of sales. Designing seals using conventional experimental processes is challenging, since the location and strength of flow noise sources are not known when the seal design is planned. Making changes to the seal system after the tooling stage is expensive for manufacturers as tooling and redesign costs can be considerable. Deliberate overdesign by adding multiple layers of seals in a wide range of locations also can reduce profit by unnecessarily raising part and manufacturing costs. Consequently, there is a strong motivation to use reliable computational capabilities to predict interior noise transmitted through seals early in the design process to address these challenges, designing seals right first time.The current study presents a computational process that can be used to predict interior…
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Door Closure Sound Quality Engineering Process

Bruel & Kjaer North America, Inc.-Todd Freeman
Brüel & Kjaer Sound And Vibration A/S-Bret Engels
Published 2019-06-05 by SAE International in United States
An important factor contributing to a customer’s subjective perception of a vehicle, particularly at the point-of-purchase, is the sound created by the passenger doors during closure events. Although these sounds are very short in duration the key systems that control the sounds produced can be highly coupled. Similarly, the necessary efforts required to understand key design criteria affecting the sound can also be highly complex.Within this paper sub-systems affecting the door closure sound are evaluated to understand key structural properties and behaviors toward the contribution to the overall sound produced. This begins with the subjective preferences of typical sounds and the difficulties with both measuring and reproducing these sounds appropriately and leads directly to the target setting and target cascading process. With targets in place, it becomes important to link them with physical measurements of the vehicle and door system to identify the key controlling mechanisms that can be affected through design.The behavior of the door system during a closure event is key for the sound produced and can be studied to understand both the…
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Development of 1D Model of Impact Force in Powertrain Equipment

Denso-Yuma Yoshimaru, Makoto Kondo, Yukie Omuro, Masashi Inaba
Published 2019-06-05 by SAE International in United States
Electromagnetic valves excellent in sealing properties and resistant to sliding are often used in powertrain equipment installed in gasoline- or diesel-engine vehicles. An electromagnetic valve has the function of moving internal valve members by means of electromagnetic force generated by the application of a voltage and thereby changing the flow path. When an electromagnetic valve operates, however, the valve members impact with one another, emitting impact noise caused by it. With the requirement for low noise in electromagnetic valves having become stricter recently from the viewpoint of comfort in the passenger compartment, predicting the noise is needed at the design stage.With this background, this paper describes the development of a 1D model of impact force that will enable the noise and the product performance to be examined simultaneously for a GDI (gasoline direct injection) high pressure pump. In contrast to the conventional model in which a movable member is taken as a mass point with a spring and a damper placed at the impact section, this paper proposes a technique in which a spring-mass model…
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PACKING, PREFORMED - MS28775 O-RING

A-6C2 Seals Committee
  • Aerospace Standard
  • AS28775A
  • Current
Published 2019-06-03 by SAE International in United States
No Abstract Available.
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