This paper presents an optimization methodology for determining the optimal suspension characteristics of an automatic washing machine.

Earlier publications by the authors have presented the modeling and experimental validation of the suspension dynamics of a horizontal-axis washing machine. That machine was characterized by the horizontal tub being suspended by three springs and supported by two dry-friction absorbers. A companion paper (Part I) assessed the modeling and validation of a different washing machine where the horizontal tub stands on four shock absorbers.

In this paper (Part II) various formulations for the optimization of the suspension system introduced in Part I are described and implemented by using a parametric grid optimization method. The primary objective of this effort is to determine the most suitable criteria that will be employed for future washing machine design optimization with different configurations. It is concluded that a weighted multiobjective function subject to washing machine cabinet motion constraint is appropriate for this purpose.

Future work will be toward the employment of an analytical optimization methodology in order to develop a complete design software that will be used by washing machine suspension design engineers.

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