共振搜索与驻留试验（RSTD）通常是为了对试件的疲劳和耐久性进行测试，RSTD试验能帮助用户找到试件结构的共振频率点并在共振点上进行驻留以检测试件的抗疲劳性和耐久性。RSTD试验中进行驻留试验时，其驻留方法包括频率锁定驻留、振幅峰值跟踪和相位跟踪。对于后两种留方法，在跟踪与驻留的过程中频率会有一些变化。我们大家都知道，在驻留试验中，由于试件的加速疲劳，试件的共振频率点会不断降低，但相位是不会变化的。因此，与频率锁定驻留相比，在进行驻留试验时，振幅峰值跟踪和相位跟踪的驻留方法更能有效地真实地跟踪到不断变化的共振点，从而对试件进行最有效的RSTD试验，以充分暴露其结构缺陷。 我们采用频率锁定驻留和相位跟踪驻留两种不同的驻留方法对试件进行试验，在本文中我们对两种试验结果进行了详细分析，同时也介绍了如何使用TENZO公司的SCS－8系列控制仪进行相位跟踪试验。

In recent years there has been a rapidly developing interest in the field of mechanical dynamics for a variety of reasons. Firstly, the development of stronger materials and greater economy in design has led to increasingly lighter structures, more prone to vibration problems. At the same time, increasing rotational speeds also give increasing likelihood of having to deal with structural resonances.

为什么要采用多变量控制？ 大家都知道，在振动台上做试验，编辑参考谱时，低频一般采用恒位移谱，中频采用恒速度谱，而高频采用恒加速度谱，这跟对振动台的控制方法有一定的关系。另一方面，我们可以通过研究加速度-速度-位移之间的幅值转换关系了解其中的原理。

Vibration is a mechanical phenomenon whereby oscillations occur about an equilibrium point. The oscillations may be periodic such as the motion of a pendulum or random such as the movement of a tire on a gravel road.

​​​​​​In physics, resonance is the tendency of a system to oscillate with greater amplitude at some frequencies than at others. Frequencies at which the response amplitude is a relative maximum are known as the system's resonant frequencies, or resonance frequencies. At these frequencies, even small periodic driving forces can produce large amplitude oscillations, because the system stores vibrational energy.