Vibration analyzer measurement method determination application
The multi-functional mechanical vibration analyzer is the basic instrument for plant condition monitoring and predictive maintenance. It is a tool for equipment reliability management and TPM. It is easy to operate and is suitable for equipment maintenance and inspection personnel. It is also suitable for production operators. It is used to measure, record and track machine status, find abnormalities, and be able to diagnose and trend common machine vibration faults.
principle
Vibration analyzer vibrometers are generally piezoelectric, and there are roughly two types of structures: 1 compression type; 2 shear type, vibration analyzer principle is to use the piezoelectric effect of quartz crystal and artificially polarized ceramic (PZT). Designed. When a quartz crystal or an artificially polarized ceramic is subjected to mechanical stress, a charge is generated on the surface thereof, and the magnitude of the charge density formed is strictly linear with the magnitude of the applied mechanical stress. At the same time, the mechanical stress is proportional to the acceleration value under certain sensitive mass. Under certain conditions, the charge generated by the piezoelectric crystal is proportional to the perceived acceleration.
The generated charge is output by the charge amplifier and other arithmetic processing. It is the data we need. Q=dij?F=dij?ma where: Q-piezoelectric crystal output charge, dij-piezoelectric crystal second-order piezoelectric Tensor, sensitive mass of m-acceleration, a-accepted vibration acceleration value. The vibrometer piezoelectric accelerometer bears the amount of charge output per unit of vibration acceleration value, and its charge sensitivity is expressed in units of pC/ms-2 or pC/g (1g=9.8ms-2). The vibration accelerometer is essentially equivalent to a charge source and a capacitor. After the equivalent circuit is simplified, the voltage sensitivity of the accelerometer can be converted to Sv=SQ/CaSv-, the voltage sensitivity of the accelerometer, mV. Charge sensitivity of /ms-2SQ-accelerometer, capacitance sensor of pC/ms-2Ca-accelerometer Piezoelectric speed sensor, which adds an integral circuit to the piezoelectric accelerometer by passing an acceleration signal The speed value of the vibration can be obtained by dividing the product once.
classification
1. Handheld vibration analyzer
The pocket vibration analyzer is designed according to the national standard series test standard and instrument standard. The circuit design is advanced, all integrated circuits are used, and the charge conversion stage is placed in the probe, which has the advantages of low noise, anti-interference and can be connected by thick cable.
2. Blasting vibration analyzer
The blasting vibration analyzer is applied to the blasting measurement project. It is a dynamic analysis instrument specially used to record and analyze the vibration data of blasting vibration. The instrument can form an intelligent test system with the sensor and data analysis system.
Measurement method
1. Using the vibration analyzer to check the status of the equipment, although it can not be used as the sole basis for the equipment overhaul cycle, it is very necessary as a reference condition. Since the speed of pumps, fans and other equipment is low, the damage caused by vibration is not unique. For example, sometimes there is no problem with the vibrometer, but the impeller is severely corroded and needs to be overhauled. Therefore, it is determined that the equipment overhaul period should be comprehensively considered from the aspects of the vibration meter test results, the cumulative operation time of the equipment, and the efficiency.
2. The application of vibration analyzer detection is also necessary as an acceptance method after equipment overhaul. It should be pointed out that due to the different degrees of old and new equipment, the inspection value of the acceptance is not uniformly defined. It should be based on the detection value of the pump group before the overhaul, and the inspection value of the repair value is not made. Uniform provisions shall be based on the test value before the overhaul of the pump set being accepted, and the repair value shall be lower than the pre-repair value. In addition, the application of the vibrometer can also find pump group installation problems (including poor alignment, long-term loosening of anchor bolts), and cavitation of the pump.
In short, the vibration analyzer and other testing instruments are used together to facilitate analysis of the operating state of the equipment. If the vibrometer is combined with oil quality analyzer, motor fault detector and other instruments, it can more accurately judge the operation of the equipment.
application
Vibration Analyzer for Drive Motors, Cash Dispensers, Generators, Transmissions, Fans, Turbines
Vibration analyzer
Can acquire two spectra simultaneously
Spectrum resolution up to 6,400
Real-time monitoring of spectrum dynamics
The spectrum can be amplified 1~6 times
The cursor has a single, harmonic and side wave display function
lTimeSignal (time waveform measurement function)
Expressed in terms of amplitude versus time
Check for impact
Determine if bearings and gears are damaged
Folding lCoastDown/up (resonance analysis function)
Simultaneous resonance testing of two measuring points
Resonance frequency measurement range 30~192,000 RPM
It can analyze the vibration value and phase change when the speed decreases/rises
Vibration value and phase trend line resolution is 167 points
lEnvelope (envelope)
Measurement bandwidth 3.2k~4.2kHz or 3.2k~20kHz
Display the high frequency signal through the filter at 0.5~1000Hz
Determine if bearings and gears are damaged
Folding lVibshape (modal analysis function)
Frequency measurement range 0.5~3,200 Hz
Simultaneous acquisition of specified frequency and amplitude of two measuring points
Two multiplier measurements can be specified at the same measurement point
Amplitude units can select displacement, velocity, acceleration
lTotalValue (total vibration value measurement function)
Simultaneous measurement of total vibration values ​​of two measuring points
Digital and bar graphs show total vibration values
Measuring bandwidth 10~3,200 Hz
Amplitude units can select displacement, velocity, acceleration
Folding lBearingCondition (bearing condition measurement function)
Simultaneous measurement of bearing conditions at two measuring points
Digital and bar graph display bearing condition
Measuring bandwidth 3,200~20,000 Hz
Amplitude unit g (RMS value)
lRoute (path measurement)
Preset measuring machine and measuring point
Automatically compare with the previous measurement of the same measurement point
Preset vibration alarm value and display warning signal
The measurement process can be noted on the sensory inspection status to the measurement point
All records of sensory inspections can be sent back to the computer
Online dynamic balance correction function
l Suitable for balanced speeds from 30 to 192000 RPM.
l Single and double plane dynamic balance correction can be implemented.
l Display unbalanced amplitude and phase in polar coordinates.
l Built-in digital speed tracking filter.
l Real-time monitoring and warning function with speed change.
l Built-in test weight automatic calculation function.
l The weight can automatically convert the weight distribution.
l The balance correction radius can be changed at any time.
l Calculate and store the system equilibrium reaction matrix.
l It can calculate and compare whether it meets the ISO-1940 standard.
Computer Analysis Software:
l Chinese window version analysis software
l Equipment and measurement point database construction file
l Measurement data transmission
l Spectrum and trend analysis and automatic report printing
l Built-in 18 brand bearing database
l Calculation and setting of system damage frequency such as gears
l Vibration warning value setting
Modal analysis software:
l Built-in square, rectangular and cylindrical models are available
l suspicious, copying or disassembling any part of the component
l You can input modal analysis data measured from other instruments by yourself.
l Change the measured value under dynamic simulation to change the new mode in real time.
l can change the modal vibration frequency by itself
l Zoom in or out to simulate graphics
l Printable analysis report and display maximum and minimum amplitude curves
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