Sweep frequency natural frequency measurement method

Sweep frequency natural frequency measurement methodIt is caused by frequency scanningfunctionsignal generatorTheJZQ-20ExciterGF200Power amplifierData acquisition analyzerComposed of components such as vibration sensors, etc., it mainly generates resonance in the workpiece through excitation and frequency scanning, and picks up signals through vibration sensors, inputData collection analyzer analysisDetermine the natural frequency of its workpieceAnd vibration analysis.This instrument has the advantages of fast testing speed, accuracy and reliability, and easy operation

Scope of application

Can be widely applied to Measurement of natural frequencies of various components, machined parts, products, and complete machinesAnd vibration analysisWidely used in metallurgy, military, machinery, chemical industry, bladesbrake discVarious types of enterprises such as motors, electrical appliances, vehicles, etc. After being tested by thousands of units in over 20 provinces and cities across the country, it has been proven that this instrument is indeed an ideal natural frequency measurement tool.

Sweep frequency natural frequency measurement methodIt is a common method for measuring the natural frequency of a workpiece, mainly by exciting and sweeping the frequency to induce resonance, and by picking up the resonance signal, the natural frequency of the workpiece is obtained1The specific steps are as follows:

1. A measurement system is composed of equipment such as a sweep frequency exciter, power amplifier, sweep frequency signal source, vibration frequency measurement analyzer, and vibration sensor.

2. Adjust the excitation frequency of the exciter from low to high while keeping the excitation power output constant.

3. By observing with a vibration measuring instrument, the amplitude of any vibration force (acceleration, velocity, displacement, velocity) rapidly increases at a certain frequency, which is the natural frequency of a mechanical vibration system of a certain order.

hammering method

The hammering method is an accurate and convenient measurement method that uses input force signals and output response signals for transmission analysis to obtain the natural frequencies of each order1The specific steps are as follows:

1. Use impact force to excite the workpiece.

2. By measuring the input force signal and the output response signal.

3. Perform transmission analysis to obtain the natural frequencies of each order.

The above two methods have their own advantages and disadvantages. The sweep frequency method is suitable for situations that require precise measurement, while the hammering method is suitable for situations where the natural frequency is quickly obtained. In practical applications, appropriate methods can be selected according to specific situations.

DFT6000 Natural Frequency Acquisition and Analysis System Software

The DFT6000 signal analysis system supports two working states: signal acquisition and post-processing analysis. The system has the following characteristics:

1. The entire system adoptsDeveloped in C++language, object-oriented programming, fully plugin architecture, system stability, reliability, and strong scalability.

2. The system supports both online mode and post-processing mode, with the option to switch between the two modes. It also supports workspace and project document management functions, making data management very convenient.

3. Support virtualTEDS sensors use a database for unified management, making them more convenient to use.

4. Simultaneously supporting multiple languages, the system defaults to supporting both Chinese and English. The language files are in text format, and users can translate them according to their actual needs to ensure good support for other languages. Different languages can be switched in real-time.

5. It can be equipped with various signal analysis instruments produced by our company, and the type of analyzer can be specified according to the actual product used by the user.

6. It has rich multiple parameter setting functions:

l The sampling start and end channels can be set arbitrarily;

l Randomly specify whether each sampling channel is saved or not;

l Can adjust the refresh rate of graphics when displaying waveforms;

7. Supports multiple file storage formats. The file format for saving can be the binary format exclusively used by Lianneng Company, or it can be saved asUFF58, UFF58b, MatLab5.0 format, convenient for users to analyze data using other software.

8. Multiple sampling methods:

l Oscilloscope mode;

l Manually triggered;

l Signal triggering;

l Continuous recording.

9. It has rich time-domain and frequency-domain analysis and processing functions, and the system supports displaying:

l Strain flower calculation

l Single trace oscilloscope view;

l Multi track time-domain waveform;

l Li Shayutu (i.eX-Y diagram, X-axis, Y-axis can specify any channel);

l Fourier analysis;

l Self spectral, power spectral, and power spectral density analysis;

l Transfer Function Analysis;

l Analysis of rotational speed of rotating machinery;

l statistical information(It can display the maximum and minimum values, peak to peak value, effective value, variance, standard deviation, peak factor, waveform factor, pulse factor, and margin factor of any number of channels).

10. Make full use of the computer's massive storage hard drive to record multi-channel signals for a long time, in real-time, and without interruption.