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Development of Elastic Couoling Torsional Vibration Test System

Author: LiuZhiLiang
Tutor: CuiTianXiang
School: Harbin Institute of Technology
Course: Instrument Science and Technology
Keywords: Torsional vibration Flexible coupling LabVIEW Order Analysis
CLC: TH825
Type: Master's thesis
Year: 2009
Downloads: 147
Quote: 1
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Abstract


The flexible coupling throughout the shafting play connection shafting, to transmitting torque as well as reduce the role of the lateral and bending vibration. Rubber or the like elastic member to join, making the shafting stiffness, torsional vibration is generated in the both ends of the flexible coupling is easy. A Institute for the marine turbine elastic coupling in the transmission torque and reduce bending vibration while, minimize the torsional vibration, reduce the long-term operation of shafting torsional vibration caused by the risk of fracture. Based on this, the subject of the flexible coupling torsional vibration test system developed, to test torsional vibration to simulate the conditions in the long-term operation. The paper first analyzes the torsional vibration measurement research status at home and abroad, compare the pros and cons of the vibration test method is commonly used to reverse. Then start from the theory of mechanical vibration, the torsional vibration of single-degree-of-freedom Wiggler differential equations based on the principle of Mechanics of Materials and Tatsuro Bo, constituted by the natural frequency of torsional vibration differential equation is derived, using the finite element analysis method is established and solved The shafting tiny shaft torsional vibration equation of the segment, last establishment of shafting differential equations using the transfer matrix method for solving the natural frequency of the entire shafting torsional vibration. Next to the rubber sleeve flexible coupling, for example, the establishment of a mechanical model to analyze its torsional vibration characteristics of dynamic parameters and calculated according to the theory of vibration. Last elaborate torsional vibration analysis - resampling order analysis, in order to analyze the torsional vibration analysis of rotating machinery. On the basis of theoretical analysis of torsional vibration characteristics according to the theoretical analysis of the elastic coupling torsional vibration parameters, this paper proposes using the the chainring method for torsional vibration measurement. The test system according to the the chainring method of measurement principle, constitute a test system hardware platform using photoelectric pulse sensor measuring chainring pulse sequence signal the computer to the NI PXI-8104 embedded controller, PXI-6221 data acquisition card pulse signal for the collection. The system uses PXI-6221 multifunction data acquisition card with 16 single-ended analog input resolution of 16 sampling rate up to 250KS / s 24 TTL / CMOS digital I / O, as well as two 32-bit counter channel , can be realized, including the lateral vibration and torsional vibration, including a variety of forms of vibration measurement. The test software LabVIEW8.2 platform, combined with NI's DAQmx and sound and vibration toolkit written. The test system software, including data collection, time domain and frequency domain analysis, data storage and playback, as well as report printing module, speed signal acquisition, torsional vibration signal extraction and display, and the power spectrum and order spectrum of the vibration signal analysis and other functions. Test software interface is friendly, simple, powerful, and easy to operate. For torsional vibration characteristics, signal source simulation experimental measurements to verify the correctness of the test system functionality through the comparison of the measurement data and simulation of signal. And analyze the sources of error of this test system testing according to the test data, test accuracy of the present system is given.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Mechanical quantity measuring instruments > Vibrating measuring instruments
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