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Research Papers

Dynamic Response Optimization of Complex Multibody Systems in a Penalty Formulation Using Adjoint Sensitivity

[+] Author and Article Information
Yitao Zhu

Advanced Vehicle Dynamics Laboratory and
Computational Science Laboratory,
Department of Mechanical Engineering and
Department of Computer Science,
Virginia Tech,
Blacksburg, VA 24061
e-mail: yitao7@vt.edu

Daniel Dopico

Advanced Vehicle Dynamics Laboratory and
Computational Science Laboratory,
Department of Mechanical Engineering and
Department of Computer Science,
Virginia Tech,
Blacksburg, VA 24061
e-mail: ddopico@vt.edu

Corina Sandu

Advanced Vehicle Dynamics Laboratory,
Department of Mechanical Engineering,
Virginia Tech,
Blacksburg, VA 24061
e-mail: csandu@vt.edu

Adrian Sandu

Computational Science Laboratory,
Department of Computer Science,
Virginia Tech,
Blacksburg, VA 24061
e-mail: sandu@cs.vt.edu

1Corresponding author.

Manuscript received October 29, 2014; final manuscript received January 10, 2015; published online February 11, 2015. Assoc. Editor: Rudranarayan Mukherjee.

J. Comput. Nonlinear Dynam 10(3), 031009 (May 01, 2015) (9 pages) Paper No: CND-14-1268; doi: 10.1115/1.4029601 History: Received October 29, 2014; Revised January 10, 2015; Online February 11, 2015

Multibody dynamics simulations are currently widely accepted as valuable means for dynamic performance analysis of mechanical systems. The evolution of theoretical and computational aspects of the multibody dynamics discipline makes it conducive these days for other types of applications, in addition to pure simulations. One very important such application is design optimization for multibody systems. In this paper, we focus on gradient-based optimization in order to find local minima. Gradients are calculated efficiently via adjoint sensitivity analysis techniques. Current approaches have limitations in terms of efficiently performing sensitivity analysis for complex systems with respect to multiple design parameters. To improve the state of the art, the adjoint sensitivity approach of multibody systems in the context of the penalty formulation is developed in this study. The new theory developed is then demonstrated on one academic case study, a five-bar mechanism, and on one real-life system, a 14 degree of freedom (DOF) vehicle model. The five-bar mechanism is used to validate the sensitivity approach derived in this paper. The full vehicle model is used to demonstrate the capability of the new approach developed to perform sensitivity analysis and optimization for large and complex multibody systems with respect to multiple design parameters with high efficiency.

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References

Figures

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Fig. 1

Five-bar mechanism

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Fig. 2

The Bombardier Iltis vehicle. Adapted from Ref. [27].

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Fig. 3

Topology of the multibody vehicle model

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Fig. 4

Left front suspension system

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Fig. 5

The modified speed bumps test

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Fig. 6

The evolutions of the parameters of chassis vertical acceleration

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Fig. 7

Dynamic response of chassis vertical acceleration

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