モーダルアナリシスによる工作機械動特性の同定と改良

概要

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The dynamic characteristics of machine tool structure including its natural frequencies and resonant modal shapes are measured precisely by the help of modal analysis method with a mini computer. The software system is developed which can identify the amounts of distributed masses, dampings and stiffnesses, and then can analyse which part of the structure may affect upon the resultant dynamics to what degree. In the system a mathematical model can be automatically obtained by giving modal parameters measured and the information with respect to the measuring points and further the simulation of structural modification for improvement of the dynamic characteristic of the machine can be carried out by use of structural parameters obtained. The method is applied to a vertical milling machine in order to improve the vibrational mode which influences greatly to the cutting capacity of the machine. Comparison with the actual structural modification and computed results of simulation show a good coincidence and also the reduction of vibration at the frequency under consideration is observed in cutting test.
公益社団法人精密工学会の論文
1980-11-05