Patent ID: 7114394

Claim:
A vibration test system for structures comprising a vibration exciting means for vibrating a real model portion that is a portion of a structure to be assessed, a load measuring means for measuring a load that is imposed on the real model portion by the vibration exciting means, and a computer that receives a numerical model representing a numerical model portion that is a portion of the structure to be assessed other than the real model portion, receives a load value measured by the load measuring means, produces a command signal, which is transmitted to the vibration exciting means, according to the received model and value, wherein the computer comprises: a command displacement calculating means for calculating a displacement, which is made by the real model portion in a predetermined time after completion of measurement by the load measuring means, according to the load value measured by the load measuring means and an external force value; a command signal producing means for producing a command signal, which is transmitted to the vibration exciting means, using as a target value the displacement calculated by the command displacement calculating means; and a step control means for controlling the vibration exciting means, the load measuring means, the command displacement calculating means, and the command signal producing means so that they will act cyclically, wherein: the command displacement calculating means uses an αOS method to time integration to solve a vibrational equation that provides a displacement; and the command displacement calculating means solves an equilibrium equation on the basis of an increment of the solution of the vibrational equation obtained at each time step from the solution thereof obtained at the previous time step.