Information and Recommendations for the （信息和建议）.pdf

Information and Recommendations for the Engineer ED-200 ENGINEERING DATA Aerovent • TC Ventco • Fiber-Aire • Twin City Fan Blower • TC Axial • Clarage Fan Fan System Vibration There is a trend in the fan industry that is causing significant some of the basic concepts and is specifically oriented changes in fan design and in the manner in which fans are towards practical considerations involved with fan applica- marketed. As a result of the maturing vibration measuring tions. instrumentation market, computer software and mainte- nance training programs have been adapted which equate “low vibration” with long life, higher quality, and lower main- What Is Vibration? tenance costs. The fan manufacturers used to be the “vibra- Forces that are not constant in amplitude or direction over tion experts” and set the tolerance for acceptable levels of time can cause solids to move repetitiously. We call this vibration. In our evolving industry, the experts are the vibration. The similar motion imparted to the air is called administrators of the maintenance programs, and the equip- sound. These phenomena are somewhat interchangeable ment is expected to conform to their expectations. This has since sound can cause vibration and vibration can cause created a number of problems: sound. One difference is that sound is only dealt with when 1. Specifications are being written by people who may be it is audible while vibration must be addressed even when it vibra