共振搜索與駐留試驗（RSTD）通常是為了對試件的疲勞和耐久性進行測試，RSTD試驗能幫助用戶找到試件結構的共振頻率點并在共振點上進行駐留以檢測試件的抗疲勞性和耐久性。RSTD試驗中進行駐留試驗時，其駐留方法包括頻率鎖定駐留、振幅峰值跟蹤和相位跟蹤。對于后兩種留方法，在跟蹤與駐留的過程中頻率會有一些變化。我們大家都知道，在駐留試驗中，由于試件的加速疲勞，試件的共振頻率點會不斷降低，但相位是不會變化的。因此，與頻率鎖定駐留相比，在進行駐留試驗時，振幅峰值跟蹤和相位跟蹤的駐留方法更能有效地真實地跟蹤到不斷變化的共振點，從而對試件進行最有效的RSTD試驗，以充分暴露其結構缺陷。 我們采用頻率鎖定駐留和相位跟蹤駐留兩種不同的駐留方法對試件進行試驗，在本文中我們對兩種試驗結果進行了詳細分析，同時也介紹了如何使用TENZO公司的SCS－8系列控制儀進行相位跟蹤試驗。
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.
為什么要采用多變量控制？ 大家都知道，在振動臺上做試驗，編輯參考譜時，低頻一般采用恒位移譜，中頻采用恒速度譜，而高頻采用恒加速度譜，這跟對振動臺的控制方法有一定的關系。另一方面，我們可以通過研究加速度-速度-位移之間的幅值轉換關系了解其中的原理。
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.
