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Turbulent Pressure Spectra for Separated Flow Conditions

Calvin College-Kurtis DeVries
Calvin Engineering-Richard DeJong
Published 2019-06-05 by SAE International in United States
The magnitude of the turbulent pressure spectrum in fluid flow over an obstruction is usually much larger than in attached flow over a smooth surface. External features on a vehicle, such as windshield wipers, side mirrors and pillars which cause flow separation, are a major source of wind noise. The modeling of the pressure spectrum in separated flow is important for designing quiet vehicles. In this study wind tunnel tests have been performed with different shaped obstructions to measure and correlate the surface pressure spectra with flow parameters such as the pressure coefficient and separation size. The model by Chase for attached turbulent boundary layer pressures is generalized to apply to separated flow conditions.
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Bolt, Machine - Double Hexagon Extended Washer Head, Drilled, Pd Shank, Silver Plated, Nickel Alloy, UNS N07718, 185 ksi Min, .3750-24 UNJF-3A

E-25 General Standards for Aerospace and Propulsion Systems
  • Aerospace Standard
  • AS3253D
  • Current
Published 2019-06-03 by SAE International in United States

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WASHER, KEY - 270 DEG, LOCKING, CRES, UNS S32100

E-25 General Standards for Aerospace and Propulsion Systems
  • Aerospace Standard
  • AS9582C
  • Current
Published 2019-04-10 by SAE International in United States
No Abstract Available.
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Numerical Investigation of Wiper Drawback

Dassault Systemes-Jonathan Jilesen
Exa Corporation-Tom Linden
Published 2019-04-02 by SAE International in United States
Windscreen wipers are an integral component of the windscreen cleaning systems of most vehicles, trains, cars, trucks, boats and some planes. Wipers are used to clear rain, snow, and dirt from the windscreen pushing the water from the wiped surface. Under certain conditions however, water which has been driven to the edge of the windscreen by the wiper can be drawn back into the driver’s field of view by aerodynamic forces introduced by the wiper motion. This is wiper drawback, an undesirable phenomenon as the water which is drawn back on to the windscreen can reduce driver’s vision and makes the wiper less effective.The phenomena of wiper drawback can be tested for in climatic tunnels using sprayer systems to wet the windscreen. However, these tests require a bespoke test property or prototype vehicle, which means that the tests are done fairly late in the development of the vehicle. Furthermore, these results do not provide significant insight into the mechanisms driving the wiper drawback.In order to better understand wiper drawback a numerical simulation is presented of…
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Development of Brushless Smart Motor for Front Wipers

Mitsuba Corp.-Tomohiko Annaka, Naoki Kojima, Takeshi Ikeda, Masaaki Kimura
Published 2019-04-02 by SAE International in United States
Along with the auto industry’s proactive engagement in autonomous driving and the development of hybrid electric vehicles (HEVs) and electric vehicles (EVs) driven by regulatory compliance for vehicle emissions control and fuel economy, there is a growing need for quieter, lighter, more compact and efficient designs of electronic components for automobiles. For wiper functions, the demand for improving wiping performance at high driving speeds and increasing wiped areas is on the rise. To fulfill all these needs, this project aimed to develop the world’s first brushless controlled wiper system, focusing on the following key elements: 1) power efficiency improvement and noise reduction through an effective sensing design and control methods of field weakening and wide-angle commutation, and 2) lightweight and compact design by reducing the weight and shaft length. The first challenge was to minimize power consumption in consideration of constant load changes during wiper operation as well as reducing the motor noise. With the correction method applied to the sensing design and the field weakening control and the wide-angle commutation control, the final design…
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A Development of the Prediction and Optimization Tool for Wiper High Speed Performance

Hyundai Motor Company-Hunjae Kim
Published 2019-03-25 by SAE International in United States
In this paper, we focused on the robust wiping performance of high speed driven condition as an important situation for vehicle safety. Frist, we selected appropriate wiper performance parameter to accurately predict its ability not only systematic point but also vehicle point. Second, we obtained parameter sensitivity of wiper high-speed performance using DFSS technique. Third, we developed prediction and optimization tool using commercial program; Excel and Visual Basic. Finally, we improved our tool to compare vehicle test and then modified prediction coefficient for the accuracy of tool. Thus, we proposed a systematic tool to predict wiping performance in high speed vehicle, and successfully obtained efficiency when we developed the new project’s wiper performance.
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Study on Basic Principles of Operation Noise of Wiper System on Vehicle

Hyundai Motor Company-Nak Kyoung Kong, Kihong Lee, Jongmin Park
Published 2019-03-25 by SAE International in United States
The wiper system consists of a motor, linkage, arm, and blade, which provides a clear front view to the driver by removing rain, snow, and foreign matter from the windshield glass. It is a system component that requires a robust design to meet system rigidity, scrubbing performance, and operating noise to any external conditions to provide the driver with a front view. In recent years, however, customer complaints about wiper noise have increased as automobile engine and noise levels have decreased. Based on the analysis of wiper noise, this paper presents quantitative judgment criteria for various wiper noises. In addition, we predict the change of wiper noise to environmental factors through the sound field analysis and propose the solution.
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WASHER, KEY - 90° LOCKING, CRES, UNS S32100, METRIC

E-25 General Standards for Aerospace and Propulsion Systems
  • Aerospace Standard
  • MA4037B
  • Current
Published 2019-03-18 by SAE International in United States
No Abstract Available.
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WASHER, CUP, LOCK - CRES AMS5510

E-25 General Standards for Aerospace and Propulsion Systems
  • Aerospace Standard
  • AS9880A
  • Current
Published 2019-02-18 by SAE International in United States
No Abstract Available.
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Washer, Thermal Compensating, Metric Series

E-25 General Standards for Aerospace and Propulsion Systems
  • Aerospace Standard
  • AIR1754B
  • Current
Published 2019-02-18 by SAE International in United States
The purpose of this document is to define: - compensation washer application requirements - recommended materials - washer thickness determination - dimensioning
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