Fundamentals of Vibration Measurement and （振动测试和基础）.pdfVIP

Phone: +61 (0) 402 731 563 Fax: +61 (8) 9457 8642 Email: info@ Website: Fundamentals of Vibration Measurement and Analysis Explained Thanks to Peter Brown for this article. 1. Introduction: The advent of the microprocessor has enormously advanced the process of vibration data acquisition and analysis in recent years. Measurement tasks that took hours only two decades ago can now be completed in minutes and better decisions made because of better data presentation. However, the basic processes of measurement and analysis have remained essentially unchanged, just like t he machines from which the vibration is measured. The results of the measurement and data analysis need to be compared with known standards or guidelines and decisions made as to whether the machine is acceptable for service or maintenance should be planned. Increasingly these processes are being handled electronically but we are still a long way from replacing the fundamental knowledge and experience of the vibration analyst. In this article we will review the basic principles of vibration measurement and analysis in order to lay the foundation for capable fault diagnosis to be considered later. 2. Fundamentals of Vibration: A simple machine may be represented as in the diagram below having mass, stiffness and damping. If we take this simple, single-degree-of-freedom model and excite it with a sinusoidal force F(t) then the distribution of forces generated by the resulting dynamic displacement x may be determined by the following equation:   m