| Summary: | Engineering structures operate with a nonlinear dynamics behaviour at certain amplitude of input range which will produce noticeable changes and unpredictable effects. In this paper, the nonlinear property of a spring is investigated. The simplified mass-spring system is developed which consists of two springs attached on a thin plate structure. The translational degree of freedom is considered in the experimental and a preferential direction on the length direction of the spring is investigated. The linear property is first investigated via impact testing for the acceleration measurement. Subsequently, the spectral testing with different amplitude of periodic chirp excitations is carried out to identify the nonlinear property of the springs. The nonlinear dynamics behaviour of the springs are identified from the significant changes of natural frequencies from the frequency response function of the system. © 2019 Published under licence by IOP Publishing Ltd.
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