英文翻译Chapter 4 portable rotating machinery vibration monitoring system designWith the modernization of enterprise device management, how to make equipment, continuous, reliable, safe and efficient operation to meet the requirements of modern enterprise management, is particularly important. The rotating mechanical equipment during operation of the vibration signals generated a lot of hidden information that can help people to correctly judge the various types of rotating machinery during operation of the state. Theory of vibration analysis and condition monitoring technology is inseparable organisms. Based on vibration analysis of rotating machinery condition monitoring system is to run the process of rotating machinery vibration information generated by the core to determine rotating machinery is running or the anomaly occurred.4.1 The system worksThe system works: The acquisition rotating machinery vibration sensor equipment running in the process of the vibration signals, after filtering hardware circuit amplification, A / D conversion, and then upload the data through the USB interface to a computer for processing; host computer can be the data collector sample rate, channel selection and so the corresponding parameter settings; through the application of the software for signal analysis and processing and analysis of paint-related waveforms; and then, through the relevant waveform analysis and spectrum analysis to determine the health status of machinery and equipment.4.2 System Structure DiagramDesign concept of this system is the top-down design, the first device to achieve the overall planning function, and then divide the total work function to the hardware and software sub-modules to realize the system overall design block diagram shown in Figure 1. 4.3 Vibration speed sensor selectionVibration sensor (Sensor) is a collection can be generated by rotating machinery vibration signals, according to a certain law of vibration signals are converted to their corresponding physical quantity or signal and another output device, is to achieve large-scale rotating machinery condition monitoring of an important link If there is no vibration sensor to the original vibration signals accurately capture and conversion, rotating machinery condition monitoring can not be achieved.By collecting vibration signal of a different nature can be classified as follows: acceleration, velocity, displacement and so on. Vibration sensor selection must take into account sensor performance requirements; sensor static and dynamic characteristics. Vibration sensor static characteristics of the main parameters are: linearity, resolution and sensitivity. The dynamic characteristics of vibration sensors used it to respond to certain criteria to represent the input signal. As the rotating machinery vibration signals output sinusoidal signal, so the dynamic characteristics of sensors used to indicate the frequency response. Rotating machinery vibration test commonly used types of sensors are piezoelectric sensors and inertial rate sensors.Piezoelectric sensors used for non-rotating components of the acceleration measurement. It is characterized by the use of a wide frequency range, usually 0.2 10kHz, therefore, it is suitable for high-speed rotating machinery vibration tests. The quality of piezoelectric acceleration sensor is small, easy to install in mechanical equipment. However, piezoelectric sensors are high impedance, weak signal sensor, measuring the site vulnerable to electromagnetic, acoustic and thermal air currents and other interference, so that the output signal contains the part of non-vibration acceleration measurement points from a false signal.Inertial speed sensor is a contact-type vibration sensor, it is absolutely vibration velocity of the detected objects into moving parts moving relative to the absolute speed of the shell, and then through an internal transformation to the relative vibration velocity transform parts of the electromotive force, namely, by measuring the electromotive force to calculate the speed of rotating machinery vibration. Inertial speed sensor that has high sensitivity and low output impedance, but also the output power of a strong signal, so it is not susceptible to electromagnetic interference afternoon, for more complex and requires a long lead on-site, still higher signal to noise ratio. The sensors frequency range between 0.008 1KHz, no special pre-amplifier, install easy to use.The system uses the VS Series Vibration velocity sensor shown in Figure 4-2, which measured bearing, chassis or structure of the vibration intensity and vibration intensity. Such sensors measure the vibration is relative to the absolute vibration of free space; its output voltage is proportional to the speed and vibration, so called velocity type vibration sensors. Can also convert the speed of traffic through the displacement of points re-display processing? This measurement can ro