Model Updating of Multiple Nominally Identical Car Components

Abstract

A method for estimation of rubber bushing stiffness parameters is presented. Four individual rubber bushings, mounted in a car rear subframe are considered. A traditional model of the bushing elements using a generalised spring model, known as a CBUSH element in Nastran, is compared to a geometrically more realistic approach where the bushing is modelled with solid elements and a linear elastic material model. Each bushing is mass loaded to better reveal the bushing's dynamic behaviour in a lower frequency range of interest. In an initial step, the overall subframe model is updated towards test data. In a second step, the bushing parameters are updated. Three nominally identical components are used to investigate the spread between the identified parameters. The model updating procedure is based on frequency responses and equalised damping. The undamped behaviour at frequencies below 300 Hz are considered. To quantify the parameter uncertainty, with respect to measurement noise for each individual, an uncertainty quantification procedure is proposed, using a linear-in-parameters surrogate model with bootstrapping.Experimental Techniques (2020) 44:391-407Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Stochastic Model Updating of Bolt-Jointed Structure for Structural Dynamics Applications

“…Table 8 shows the mode shapes of the FE-Type 4 model. This is because CBUSH element connector is the most detailed spring element in which the joint stiffness can be provided in 6 degree of freedom (DoF) [26]. By doing so, the uncertainty study for the joint stiffness can be expanded into different DoF.…”

Analysis and optimization of the vehicle handling stability with considering suspension kinematics and compliance characteristics

“…For three identical rear subframes, finally a model update program using damping equalization has been successfully used to update all bushes of the rear subframe and find the optimal parameters of the bushes. 2 Plagge et al proposed a model that is based on physical ideas and reasonable assumptions about the microstructure of materials and is designed for high efficiency and robustness in finite element applications. 3 Sedlaczek et al, proposed an advanced phenomenological Daimler model of rubber bushings.…”