A method for the sensitivity analysis of the dynamic transient response of flexible multi-body systems is presented. The main objectives in developing the method are: 1) to reduce cost and achieve accuracy of the sensitivity analysis, 2) todevelop a performant tool for the sensitivity analysis and the optimisation of flexible multi-body systems. Practical applications are located in the automotive industry, with the optimisation of the driving behaviour of vehicles and in the aerospaceindustry. The method consists in solving simultaneously the dynamic and the sensitivity problem. Two simple examples are presented to demonstrate the method, one for a dynamic response problem, and the second one for a kinematic problem .
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