【正文】 ing machinery vibration test monly used types of sensors are piezoelectric sensors and inertial rate sensors.Piezoelectric sensors used for nonrotating ponents of the acceleration measurement. It is characterized by the use of a wide frequency range, usually ~ 10k Hz, therefore, it is suitable for highspeed 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 nonvibration acceleration measurement points from a false signal.Inertial speed sensor is a contacttype 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 plex and requires a long lead onsite, still higher signal to noise ratio. The sensor39。 through the application of the software for signal analysis and processing and analysis of paintrelated waveforms。英文翻譯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. 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 puter for processing。 host puter can be the data collector sample rate, channel selection and so the corresponding parameter settings。 and then, through the relevant waveform analysis and spectrum analysis to determine the health status of machinery and equipment. System Structure DiagramDesign concept of this system is the topdown design, the first device to achieve the overall planning function, and then divide the total work function to the hardware and software submodules to realize the system overall design block diagram shown in Figure 1. 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 largescale 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。s frequency range between ~ 1KHz, no special preamplifier, install easy to use.The system uses the VS Series Vibration velocity sensor shown in Figure 42, 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。 transverse sensitivity ratio: 5%③ Direction: (provides for horizontal direction 0 176。 177。Horizontal: 0 176。 10 176。 Insulation resistance : 20M Hardware Design Module Analog signal conditioning circuitJP1 then collected the raw vibration sensors capture signal amplification through the filter into the analog circuit A / D chip for A / D conversion, in order to host puter for data processing.1. Signal filteringVibration sensor will be a nonpower rotating machinery vibration signals into electrical signals, but the vibration signals superimposed on the scene useless noise, these no