A State of the Art Approach to Proper Car Care

Giek, George G.; Thurmond, Jeffery C.; McIntyre, Michael

doi:10.4271/850430

Cited by 1 publication

(2 citation statements)

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“…The specific material values: heat conductivity  , specific heat capacity c and density  ‡ for solid bodies and gases can be determined directly from table reference literature and standard literature like (Baehr, 2008;Giek, 1995). The heat transfer coefficient i  depends on the component geometry and flow conditions apart from the material.…”

Section: The Dynamic Characteristic and Hysteresis Effect Of An Air Smentioning

confidence: 99%

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The Dynamic Characteristic and Hysteresis Effect of an Air Spring

Löcken¹,

Welsch²

2015

International Journal of Applied Mechanics and Engineering

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In many applications of vibration technology, especially in chassis, air springs present a common alternative to steel spring concepts. A design-independent and therefore universal approach is presented to describe the dynamic characteristic of such springs. Differential and constitutive equations based on energy balances of the enclosed volume and the mountings are given to describe the nonlinear and dynamic characteristics. Therefore all parameters can be estimated directly from physical and geometrical properties, without parameter fitting. The numerically solved equations fit very well to measurements of a passenger car air spring. In a second step a simplification of this model leads to a pure mechanical equation. While in principle the same parameters are used, just an empirical correction of the effective heat transfer coefficient is needed to handle some simplification on this topic. Finally, a linearization of this equation leads to an analogous mechanical model that can be assembled from two common spring-and one dashpot elements in a specific arrangement. This transfer into "mechanical language" enables a system description with a simple force-displacement law and a consideration of the nonobvious hysteresis and stiffness increase of an air spring from a mechanical point of view.

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Section: The Dynamic Characteristic and Hysteresis Effect Of An Air Smentioning

confidence: 99%

“…Table 1. Material data according to Giek (1995 Table 2. Material data for air as an ideal gas according to Baehr (2008).…”

Section: Simulation and Validationmentioning

confidence: 99%