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High Frequency Vibration Transmission Analysis on Agricultural Tractor by Using Combined Dynamical Energy Analysis and Transfer Path Analysis Approach

University of Nottingham-Gregor Tanner, Martin Richter
Yanmar R&D Europe s.r.l-Satoshi Morita
  • Technical Paper
  • 2019-32-0527
To be published on 2020-01-24 by Society of Automotive Engineers of Japan in Japan
Dynamical Energy Analysis (DEA) has recently been introduced as a mesh-based high frequency method modelling structure borne sound for complex built-up structures. Using DEA, the structure-borne sound of an assembled agricultural tractor was calculated and good agreement between measurement and DEA calculations has been shown. However, it is still difficult to model a solid structure as currently DEA is based on wave-transmission calculations through plates and plate-to-plate junctions. Additionally, it is often difficult to generate accurate FE meshes of assembled complex structures because of welds, bolts, and rubber brushes between components. In this paper, we propose a novel method to generate DEA elements based on measurement data in order to model solid parts of a complex structures. The method of Advanced Transfer Path Analysis (ATPA) is employed to extract energy-transmission characteristics of a structure. Firstly, Frequency Response Functions (FRFs) are measured between interface points on a structure. Then the direct transfer functions between all interface points are calculated using ATPA. Finally, DEA elements connecting interface points are calculated. They are based on the ATPA result…
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Oil, Reference, for "L" Stock Rubber Testing

AMS CE Elastomers Committee
  • Aerospace Material Specification
  • AMS3020B
  • Current
Published 2020-01-17 by SAE International in United States

This specification covers a petroleum-based reference oil.

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THE EFFECT OF BIODIESEL ON THE ELECTRICAL PROPERTIES OF AUTOMOTIVE ELASTOMERIC COMPOUNDS

Ford Motor Company-Rodrigo Polkowski Ângelo Aguiar, Oberti Almeida, Cristiane Gonçalves, Cristiano Herbert, Helano Santos, Jodalva Souza
  • Technical Paper
  • 2019-36-0327
Published 2020-01-13 by SAE International in United States
The lack of electrical conductivity on materials, which are used in automotive fuel systems, can lead to electrostatic charges buildup in the components of such systems. This accumulation of energy can reach levels that exceed their capacity to withstand voltage surges, which considerably increases the risk of electrical discharges or sparks. Another important factor to consider is the conductivity of the commercially available fuels, such as biodiesel, which contributes to dissipate these charges to a proper grounding point in automobiles. From 2013, the diesel regulation in Brazil have changed and the levels of sulfur in the composition of diesel were reduced considerably, changing its natural characteristic of promoting electrostatic discharges, becoming more insulating. Taking into account the critical factors mentioned above, the SAE J1645 standard specifies the levels of conductivity and maximum electrostatic energy accumulation (ESD) that automotive materials must meet to avoid unintentional discharges on these systems and guarantee the integrity of the involved components and the safety of occupants. Thus, this work aims to analyze the effect of (bio)diesel on the electrical properties…
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Transfer Function and Simplified Stiffness Model for Damper Design and Validation

EATON Ltda-André L. A. M. Leão, Bruno C. de Paulo, José I. Piva
  • Technical Paper
  • 2019-36-0229
Published 2020-01-13 by SAE International in United States
The process of vehicular components validation requires field performance verification. During the development process of a component, testing and data collection often require longer than the vehicle test period available for a given component. In order for the vehicle development process to encompass all components tests and software calibration both, cost and time increase. Thus, it has become progressively necessary to use simulation tools and bench analysis during product development processes. Mathematical tools for simulation have been gaining popularity exponentially due to the fact that they enable users to simulate many designs in order to find the optimal solution and reduce development time, prototypes and field tests costs. The present work uses the Signal Analysis Transfer Function Tool, combined with a bar model proposed for calculating stiffness, in the development of a rubber damper and support, as a solution to attenuate the vibration on the electronic module mounted on an automated transmission. The function of the rubber damper is to attenuate the vibration effect of sprung mass and the interactions with vehicle excitation. An important…
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CASE STUDY: RELATION BETWEEN LOADS AND ENGINE MOUNTS STIFFNESS VARIATION APPLIED ON MID SIZE TRUCK

General Motors Mercosul-Marcos Rogério Sanches Barbetti, Fernando Braga, Luiz Carlos Sá, Rafael Tedim Terra
  • Technical Paper
  • 2019-36-0094
Published 2020-01-13 by SAE International in United States
This Paper has as objective to present a study about how the stiffness variation can affect the powertrain mounts system loading. The initial driver for this research is to find enablers to improve the durability performance through loads reduction without noise and vibration degradation.In this study, we will review a summary about powertrain mounts main characteristics to help the understanding how to establish the static and dynamic characteristics, with the external excitations originated from durability track as well the engine torque applied over the system.We used the mid-size truck as physical hardware and the required load data were collected through load cells installed on the powertrain mount system.The load data were analyzed individually per mount and split over the three axles (X, Y and Z). As control factor, we applied different stiffness or “tunings” on the mount rubber body and as result, we established the relation between stiffness and powertrain mounts system loading.The presented graphic results show the load behavior along the durability tracks, it is possible to understand and establish the relation between loads…
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O-Ring Molded from AMS7274 Material

A-6C2 Seals Committee
  • Aerospace Standard
  • AS3570A
  • Current
Published 2020-01-09 by SAE International in United States

This standard establishes the dimensional and visual quality requirements, lot requirements, and packaging and labeling requirements for O-rings molded from AMS7274 rubber. It shall be used for procurement purposes.

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Acrylonitrile Butadiene (NBR) Rubber, Hot Oil and Coolant Resistant, Low Swell, 55 - 65

AMS CE Elastomers Committee
  • Aerospace Material Specification
  • AMS3227J
  • Current
Published 2020-01-03 by SAE International in United States

This specification covers a nitrile (NBR) rubber in the form of sheet, strip, tubing, extrusions, and molded shapes.

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Acrylonitrile Butadiene (NBR) Rubber, Hot Oil Resistant, Low Swell, 75 - 85

AMS CE Elastomers Committee
  • Aerospace Material Specification
  • AMS3229K
  • Current
Published 2020-01-03 by SAE International in United States

This specification covers a nitrile (NBR) rubber in the form of sheet, strip, tubing, extrusions, and molded shapes.

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Butyl (IIR) Rubber, Phosphate Ester Resident, 85 - 95

AMS CE Elastomers Committee
  • Aerospace Material Specification
  • AMS3239G
  • Current
Published 2020-01-03 by SAE International in United States

This specification covers a butyl (IIR) rubber in theh form of sheet, strip, tubing, extrusions, and molded shapes.

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CONNECTOR ACCESSORIES, ELECTRICAL, BACKSHELL, ENVIRONMENTAL, CABLE SEALING, STRAIGHT, GROUNDING (WITHOUT STRAIN RELIEF), CATEGORY 1C (FOR AS50151 SOLDER TYPE, V THREAD OF AS310XX CLASSES A, B, C, OR K CONNECTORS, AS95234 CONNECTORS)

AE-8C1 Connectors Committee
  • Aerospace Standard
  • AS85049/1B
  • Current
Published 2019-12-19 by SAE International in United States
No Abstract Available.
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