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Synchronous excitation system used for thin shell high-order modal shape test and test method

A synchronous excitation, high-order mode technology, applied in vibration testing, testing of machine/structural components, measuring devices, etc., can solve problems such as difference in output power of driving power supply

Inactive Publication Date: 2015-11-11
NORTHEASTERN UNIV
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Problems solved by technology

However, due to the great differences in piezoelectric ceramics in size, material parameters, capacitance, preparation process (single-stage or dual-stage) and output power of driving power, piezoelectric ceramics are currently used directly as vibration excitation equipment. There are still some problems in using

Method used

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  • Synchronous excitation system used for thin shell high-order modal shape test and test method
  • Synchronous excitation system used for thin shell high-order modal shape test and test method
  • Synchronous excitation system used for thin shell high-order modal shape test and test method

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Embodiment Construction

[0084] Specific embodiments of the present invention will be described in detail below.

[0085] A synchronous excitation system for testing high-order mode shapes of thin shells, such as figure 1 shown, including:

[0086] An industrial computer that sends commands to generate vibration sources and obtains excitation signals in real time;

[0087] A signal generator that generates the corresponding vibration source signal according to the vibration source instruction of the industrial computer;

[0088] An in-phase power amplifier that converts the vibration source signal into an excitation signal with constant output frequency and phase and amplitude amplification;

[0089] Adsorption-type vibrators that use excitation signals to vibrate thin-shell components by means of adsorption;

[0090] A data acquisition instrument for collecting the excitation signal of the adsorption type vibrator;

[0091] The output end of the industrial computer is connected to the input end o...

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Abstract

The invention provides a synchronous excitation system used for a thin shell high-order modal shape test and a test method. The system comprises an industrial computer, a signal generator, an in-phase power amplifier, adsorption type vibration exciters and a data acquisition instrument. The output end of the industrial computer is connected with the input end of the signal generator. The output end of the signal generator is connected with the input end of the in-phase power amplifier. The output end of the in-phase power amplifier is respectively connected with the input ends of the adsorption type vibration exciters. The adsorption type vibration exciters absorb on the side wall of a thin shell component. Excitation signals outputted by the adsorption type vibration exciter affect on the side wall of the thin shell component. Meanwhile, the output ends of the adsorption type vibration exciters are connected with the input end of the data acquisition instrument. The data acquisition instrument is connected with the industrial computer. The synchronous excitation system used for the thin shell high-order modal shape test is simple and compact in structure without gap, small in profile, low in cost, high in load capacity and convenient in part processing, and beauty of the overall structure is enhanced and assembling is facilitated so that assembling and adjustment of the system are enabled to be quite convenient.

Description

technical field [0001] The invention relates to the technical field of mode shape testing, in particular to a synchronous excitation system and a testing method for testing high-order mode shapes of thin shells. Background technique [0002] There are a large number of thin-shell components in mechanical equipment such as gas turbines, centrifugal compressors, crushers, and granulators, such as structural shells, bearing outer rings, drums, and steel rings. These thin-shell components are often excited by high-order modes under the action of multi-field coupling environments such as aerodynamic fields, inertial force fields, and mechanical vibration fields, resulting in high-order vibration fatigue failures. Due to the abundant local vibration of the high-order mode shape and the increasingly complex vibration characteristics, there are often multiple nodes or multiple nodal lines. Using a single shaker to test the mode shape has uneven excitation energy distribution, and it...

Claims

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Application Information

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IPC IPC(8): G01M7/02
Inventor 李晖于辉李鹤罗忠孙伟闻邦椿
Owner NORTHEASTERN UNIV
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