The reference location is typically either the fixedexcitation location when performing a shaker excitation or the stationary accelerometer location when performing an impact test.
典型情况是，要么当进行激振器激励时激励位置固定，要么进行锤击试验时加速度位置固定。
2
The chaotic motion of a pipe single mode system of the fixed supported at two ends under base excitation is actively controlled by introducing the feedback of notch filter.
对于两端固定输流管道在基础简谐激励下的单模态系统，利用凹槽滤波器对系统的混沌运动进行了控制。
3
Operational abilities and excitation force characteristics of a new national trailing-edge fixed-vane excitation system (FVES) with a slotted rotating cylinder were verified by flight tests.