Collision vibration systems are usually modeled as a nonlinear spring whose characteristics are described by the broken line model. These systems are called piecewise-linear systems. A piecewise-linear system is highly nonlinear, and it is usually difficult to predict the system response using any general analytical solution. If the effects of design parameters such as clearance size and dynamic nonlinearity of the systems are known, the structures can be designed to be safer and more comfortable. In a previous paper, forced collision vibration for 2nd order super harmonic resonance in a mass-spring system for two-degree-of-freedom was analyzed. The restoring force, which is generated when a mass collides elastically to another mass, was modeled as an asymmetric piecewise-linear system. In this research, the 1/2nd order sub-harmonic resonance is treated for the same system in the previous research. In order to analyze resulting vibration for the 1/2nd order sub-harmonic resonance, the Fourier series method is applied and analytical solutions for this system are derived. Next, following the analytical solutions, numerical calculations are performed, and the resonance curves are constructed by using resulting vibration. Effects of amplitude ratio of excitation, nonlinearity of the system and mass ratio on the resonance curves are shown numerically. For verification of the analytical solutions, numerical simulations are performed by the Runge-Kutta method, and numerical results based on analytical solutions are compared with numerical simulation results on the resonance curves. As a result, the analytical solutions are in a fairy good agreement with the numerical simulation results.
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