Figure 8: Using the time-domain displacement response for the simulation experiment to solve the , values, which are both functions of time. (a) The time-domain displacement response is . (b) The velocity response is , which is the numerical differential of . (c) The acceleration response is , which is the numerical differential of . (d) The characteristic trajectory of the motion formula on the plane. (e) The coefficient of stiffness is solved as graph, , , and is not constant. (f) The coefficient of viscous damping is solvedas graph, , , and is not constant.