Abstract
When an impact drive mechanism (IDM) is subjected to a heavy load, the large inertia of that load will seriously decrease the moving efficiency of the IDM. To solve this problem, a method of dynamic mass isolation is introduced in this article. The influence of load inertia is decreased to a minute value by adopting a light slider and using a spring between the load and the IDM. Thus, the moving efficiency can be increased. Kinematic models have been established and calculated by MATLAB/Simulink. Two prototypes have been fabricated and used to conduct a series of experiments. With a load of 1.8 g, the prototype with dynamic mass isolation presents a moving efficiency of 50.6%, whereas the other prototype without isolation presents a moving efficiency of only 11.9%. As a result, the average step size of the former is approximately four times larger than that of the latter. Moreover, the prototype with dynamic mass isolation can hold almost the same average step size with a wide range of load mass. The proposed method is low cost and may have practical significance for application in any known IDM-based actuating system to improve the performance.
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