Noise, vibration, and harshness

Customer Initial cost Operational and maintenance costs Quality Range (between refueling) and refueling convenience Passenger/cargo space Performance (acceleration, speed, ride quality, acceptably low levels of noise, vibration, and harshness) Safety... 

Another important performance imperative is NVH (noise, vibration, and harshness) concerns. FEA can help in this aspect as well by making predictions about natural frequencies. In our example, the frequency predicted for the first mode is... 

NVH noise, vibration, and harshness — the acoustic and tactile stimuli... 

Polypropylene, a homopolymer polyolefin engineering plastic provides excellent chemical resistance, purity and it is the lightest of all commercial plastics. PP offers innovative solutions to many challenges that face the automotive industry today. Its low density compared to traditional materials significantly contributes to fuel economy and reduced material costs. Its excellent noise, vibration, and harshness (NVH) properties contribute to enhanced passenger comfort. Thus, PP has become the most important thermoplastic material in automobile industry. PP homopolymers, random copolymers, and impact copolymers are used in products such as automotive parts and battery cases, carpeting, electrical insulation, and fabrics. 

BSR/NVH BSR means "buzz, squeak, and rattle." NVH stands for noise, vibration, and harshness. This step examines the interaction of the component with others in the system. 

Elastomers serve a large potion of the overall need for plastics in the automotive industry. Their prime applications are in energy absorption, followed by noise, vibration, and harshness. However, the industry is crowded with many equivalent choices, and competition is growing fiercely. Sometimes, as a result of regulatory changes in areas such as safety and fuels, the need arises for either more elastomers or novel ones with differentiated properties. 

The low specific density provides weight saving and helps to improve fuel economy, while also reducing cost. The intrinsically superior noise, vibration and harshness (NVH) properties contribute to improved comfort. 

Most automotive R D projects within adaptronics are concerned with active vibration control (AVC) and active structural acoustic control (ASAC) for optimization of NVH (noise, vibration and harshness) characteristics and even soimd design. Furthermore, active measmes to increase the passive safety of vehicles are being developed. Shape and position control as well as structmal health monitoring (SHM) are stiU of secondary importance. 

In recent years, demands have increased in using polyamide (PA) and polyethyleneterephthalate (PET) products to replace certain metal structures in the automotive vehicle air induction and power train systems, lawn/garden and power tools [1-2]. An average car uses 18 kg of PA and 3 kg of PET. With the annual vehicle production at nearly 12 million, the needed amount of PA is more than 200 million kg and more than 45 million kg for under-the-hood applications alone [5]. The design of these components, especially those critically stressed parts such as vibration welded air intake manifolds [5-4], door and instrument panels, requires advanced analyses of structure [5-5], NVH (noise, vibration, and harshness), welded joints [5], and service life [7],... 

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