W.D. Marscher and S.V. Frolov
Mechanical Solutions, Inc., NJ
Vibration detection and display using magnification, or amplification, of high-speed video will be presented as a very useful tool. Detection of very low displacement levels is demonstrated. Video methods detect displacement, but velocity is the key factor in shock and vibration evaluation. For a given velocity acceptance level, the displacement associated with that velocity decreases in proportion to the vibration frequency. At higher frequencies such as shock frequencies important for artillery loading and operation, and engine operation, it is much more challenging. Furthermore, adequate alignment of systems and machinery is key to its reliable operation. Poorly aligned shafting or other equipment can cause overloading, or internal rubs at close running clearances, and seals. Alignment can change in an unexpected manner between the at-rest “cold” non-operating condition, and its warmed-up and operating state. Conventional approaches can do a good job of assessing the degree and nature of misalignment, but such approaches can be impractical in some circumstances. The authors will present new optical methods based on video motion magnification and/or video scene interpretation show promise in many such applications. Case histories are provided.