3体系に近似された弁ばねのサージングを制振するカム関数の導出

抄録

To reduce surging of a valve spring in a reciprocal engine, we design cam functions that simultaneously damp three eigen frequencies of the spring by modeling it into a series undamped 3DOF mass-spring system. The cam functions were defined from a finite-time-settling function termed vibration manipulation function (VMF), which consists of half-integer trigonal functions in an arbitrary operational period. The obtained analytical conditions of the valve spring decide the rising time of the cam. In simulations, we ascertained simultaneous suppression of the residual vibrations during translational motions of the 3DOF valve spring lifted with a designed two-dwell cam.