Tag Archive for stiffness (2 post)

55010I – Optimized Stiffness for Linear Time-invariant Dynamic System According to a New System Design

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2-55 Abstract :  This paper deals with a linear time-invariant dynamic system such as spring-mass-damper system. General dynamic systems are quite ommonly to be redesigned for another purpose of using. For example, if one utomobile must be redesigned to have more weights, the existing suspension must be replaced due to that gained weight. Therefore the stiffness and damping coefficient must be recomputed in order to make the automobile become suitable for using as previous. Here the spring-mass-damper system is used as an example to demonstrate the technique through dynamic optimization where the problem is solved in two categories as minimum energy and maximum jerk. Once the state and control variables are provided from the problem of minimum energy and maximum jerk, respectively, these parameters will be substituted in dynamic equations and leave the stiffness and damping coefficient as the unknown parameters to be solved. Solutions are computed through specific dynamic optimization program which known as parameter optimization. Finally, the new designed system becomes as good as previous system.

Author : Tawiwat Veeraklaew

55011I – Automobile Suspension Design for Smoothness by Minimizing Vector Cost of Jerk and Time

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3-55 Abstract :   An automobile suspension is designed for a luxury of drivers and passengers. However, these comfort issues are involved with minimum time, which related to maximum energy, and minimum jerk. This problem is defined as a dynamic optimization problem with several costs (vector cost). The solutions will compromise all the costs in the previous sentence and this paper shows how to obtain the solutions when the problem has two costs or more. Automobile suspension in simple mechanism is used to illustrate as example. Force that applied to the suspension from the wheel is provided while maximum jerk is considered. Then the problem is resolved with stiffness and damping coefficients are left as unknown parameters. Finally, the cost between time and jerk can be weighted easily to achieve a user purpose.

Author : Tawiwat Veeraklaew , Thanchanut Thammarut