Analysis of Vibration of Cylinder Block by Reduced Impedance Method

抄録

Vibrations of cylinder blocks of diesel engines with 4 and 6 bores are analyzed by the reduced impedance method proposed by the authors. A cylinder block is divided into some component structures, and the mechanical impedances of each component are calculated by the finite element method. These impedances are reduced and composed to get a unified equation of motion. This equation is solved to get the natural modes and the natural frequencies of the total structure. On the other hand, the natural frequencies are detected experimentally, using the Fourier translations of the measured impact waves of the force and the acceleration. The natural modes are observed by the holographic technique with an argon gas laser. The calculated results agree well with the experimental ones.