Non-Asbestos and Asbestos Based Cylinder Head Gaskets-Differences in the Basic Design Principles

1987 ◽  
Author(s):  
Dietrich Berner
Keyword(s):  
Cylinder Head ◽  
Design Principles ◽  
Basic Design

scholarly journals Passivhaus

Encyclopedia ◽  
2020 ◽  
Vol 1 (1) ◽  
pp. 20-29
Author(s):  
Alejandro Moreno-Rangel
Keyword(s):  
Building Design ◽  
Design Principles ◽  
Low Energy ◽  
Design Criteria ◽  
Basic Design ◽  
Passive House ◽  
Low Energy Buildings

Passivhaus or Passive House buildings are low-energy buildings in which the design is driven by quality and comfort, hence achieving acceptable levels of comfort through post-heating or post-cooling of fresh air. Additionally, Passivhaus building design follows the Passivhaus design criteria, as described in the Passive House Planning Package (PHPP). This article aims to introduce the Passivhaus background, development, and basic design principles. Finally, it also presents a brief description of the performance of Passivhaus buildings.

Design Principles of Controlling Vehicle Gear Whine Noise Based on Loudness Metric

2013 ◽  
Vol 477-478 ◽  
pp. 86-89
Author(s):  
Dong Guo ◽  
Quan Shi ◽  
Wen Li Li ◽  
Chuan He Xu
Keyword(s):  
Case Studies ◽  
Dynamic Behavior ◽  
Sound Quality ◽  
Design Principles ◽  
Noise Spectrum ◽  
Basic Design ◽  
Vehicle Noise ◽  
Gear Noise ◽  
Tonal Frequency ◽  
Human Hearing

In-vehicle noise is composed of a variety of tonal (frequency-related) components and the tonal components play an important role in the improvement of sound quality for interior vehicle noise. Among them, gear whine noise is the key contributor to total in-vehicle noise and gain a lot of researchers interest. Through their effort, thespl (dBA)is relatively low. However, customers still perceive the tonal components and complain about the vehicle quality. Therefore a better understanding of how tonal components are perceived is necessary for automotive gear transmission designers. In this study, firstly, gear dynamic behavior is briefly introduced to get the gear noise spectrum. Secondly, human hearing mechanism to different tonal components is summed. Then loudness case studies are conducted. Finally, some basic design principles of controlling gear whine noise are proposed based on the results.

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