| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a method and an apparatus in which the stability of a vibration analysis is ensured so as to enhance the accuracy of the vibration analysis and in which an inessential high-frequency mode can be damped by a method wherein an acceleration in the time which elapses from a certain time by a certain time is approximated by using a specific expression. SOLUTION: The time history response of a multimass-point linear vibration system expressed by Expression (1) at a time when an external force (f) is given is computed by a computer. At this time, an acceleration as at the time of ts=tn+τwhich elapses from the time of tn by the time ofτis approximated by Expression (2) at the time ofτas shown in Expression (2). In Expression (1), M, C and K represent the mass, the damping and the rigidity matrix of the vibration system, (a) represents the acceleration vector of the vibration system, (v) represents the speed vector of the vibration system, (d) represents the displacement vector of the vibration system, and (f) represents the external-force vector of the vibration system. In addition, in Expression (1), a state variable (b) and a state variable (c) represent an acceleration and a vector which expresses its differential amount respectively. This vibration analytical apparatus is realized as a computer in which a calculation means is formed on a storage device such as a memory, a hard disk or the like and which functions by a vibration analytical program.</p> |
