Exciter - Kishinki (English spelling)

Japanese: 起振機 - きしんき（英語表記）exciter

A device that applies a force that changes in a sinusoidal waveform over time to a structure to induce forced vibration. It is different from a vibration table, which vibrates a structure placed on a stand. It can be broadly divided into those that apply force to a structure from the outside using piston motion, and those that are attached to the structure itself and apply force using centrifugal force. Since the magnitude and frequency of the applied force can be controlled, by systematically changing the frequency (period) of the excitation force and measuring the vibration displacement generated in each part of the structure, the resonant frequency (natural frequency) of the structure, as well as the shape and damping of the vibration at that time, can be determined.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

時間とともに正弦波形で変化する力を加えて構造物に強制振動を起こさせる装置。構造物を台の上にのせて振動させる振動台vibration tableとは異なる。ピストン運動によって外から構造物に力を加えるものと，構造物そのものに取り付け，遠心力を利用して力を加えるものに大別できる。加える力の大きさと振動数が制御できるようになっているので，起振力の振動数(周期)を系統的に変化させて構造物各部に発生する振動変位を測定すれば，構造物の共振振動数(固有振動数)，そのときの揺れの形と減衰量が求められる。

出典　株式会社平凡社世界大百科事典第２版について　情報

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