Car Automotive

Archive for November 19th, 2009

In the development of a new vehicle platform, its crashworthiness is an important concern, and it is imperative to compare the impact severity of the vehicle and occupants under various test and design conditions. Since an impact is a physical event that involves analyses of impulses and energy components, such as kinetic energy, energy absorption, and energy dissipation, the analyses require both the principle of work and energy and that of impulse and momentum. Although both principles are derived from Newton’s Second Law, they are not mutually exclusive when it comes to solving problems involving impact and excitation.

It will be shown that any crash event, modeled by either a single-mass or a multi-mass system,involves impact and/or excitation. Recognizing the existence of the impact and/or excitation, the closed-form formulas  utilized to solve problems. Case studies, such as the dynamic principles of pyrotechnic pretensioner on the occupant responses, are investigated.

The preloading effect of a restraint system on the occupant response and ridedown efficiency are discussed. Many crashworthiness topics related to single and multi-vehicle collisions are analyzed by the engineering principles presented so far for determining the degree of crash severity. Applications of these principles to vehicle-to-vehicle compatibility, shear loading of truck  body mounts due to eccentric loading, and the methodology of accident reconstruction methodology are also presented.

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The European Union wants to establish a position as a forerunner of climate protection and to reduce total CO2 output by 30 percent on 1990 values by 2020. The officials in Brussels have even set their sights on a 60 to 80 percent reduction in carbon dioxide emissions by the middle of the century.

This is a highly ambitious target that could only be achieved through a massive collective effort on the part of all CO2 emitters – households, industry and transport.The public debate, however, often gives the impression that the automobile is primarily responsible for potential climate change. Despite the fact that passenger cars only account for twelve percent of total CO2 emissions in Germany, many environmental activists in particular consider personal transport to be the root of all evil, reason enough for politicians to pay particular attention to reducing passenger car emissions.

In December 2007, the European Commission published a proposal to limit
the CO2 emissions of all passenger cars registered from 2012 onwards.