Vibration damping vehicle

Uses Hot-melt adhesives for paper lamination road marking compds. bitumen sealant/roofing sheet ingred. vehicle vibration damping material corrosion protection wrappings back-coating compositions (carpet tiles)... 

Automotive (glazing of windshields, glazing of rear lights, recreational vehicles, vibration damping, gas tank liner)... 

Active Vibration Reduction. An active vibration control system consists of a hydraulic or electrodynamic actuator, vibration sensor, and electronic controller designed to maintain the seat pan stationary irrespective of the motion of the seat support. Such a control system must be capable of reproducing the vehicle motion at the seat support, which will commonly possess large displacement at low frequencies, and supply a phase-inverted version to the seat pan to counteract the vehicle motion in real time. This imposes a challenging performance requirement for the control system and vibration actuator. Also, the control system must possess safety interlocks to ensure it does not erroneously generate harmful vilxation at the seat pan. While active control systems have been employed commercially to adjust the static stiffness or damping of vehicle suspensions, to improve the ride comfort on different road surfaces, there are currently no active seat suspensions. 

Most butyl rubber is used in the tire industry. Isobutylene-based rubbers are used in underhood hose for the polymer s low permeability and temperature resistance, and high damping, resilient butyl rubbers are used for NVH (noise, vibration, harshness) applications such as automotive moinits for engine and vehicle/road NVH attenuation. ... 

In vehicles and mobile machinery in which an operator is seated, the springing and damping of the seating should be adjustable so that it can be set up to minimize the vibration transmitted from the terrain or from the work, e.g. rock drilling. 

Suppression of flexural vibrations in metal plates and bars by application of a thin layer of polymeric material, either spread directly or applied in the form of a tape, has become of great importance both for elimination of noise (especially in vehicles and airplanes) and for improving fatigue characteristics. It was mentioned in Chapter 7 that measurements of resonance frequencies and damping in such compound layered systems can be used for obtaining the viscoelastic properties of the polymeric stratum. Conversely, knowledge of the viscoelastic properties and their dependence on frequency and temperature (and plasticization, incorporation of fillers, etc.) aids in the selection of antidamping materials for specific applications. ... 

Automobile suspension units include a number of elements which possess nonlinear characteristics in either displacement or velocity. It has been noted that correct modeling of these nonlinear characteristics is indispensable [1] when studying the dynamic behavior of a suspension unit, and hence its contribution to overall vehicle vibrational comfort. It has also been shown [2] that the most important nonlinearity is that of the shock absorber damping characteristic. The importance of the damper has stimulated a number of studies regarding the modeling and specification of shock absorbers [3-9]. The objective of the present study is to quantify the influence of the damper curve on the vertical force transmissibility from the wheel hub to the upper dome. The upper McPherson dome was chosen as the output measurement point because it is the location at which the greatest static and dynamic forces enter the car body from the suspension unit. The vertical direction has been isolated for the purposes of this study because it is the principal vibrational direction for an automobile on a typical road. 

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