Adsorption type vibration exciter

Abstract

The invention discloses an adsorption type vibration exciter, which comprises an excitation module, a supporting frame, and three adsorption foots. The excitation module comprises a vibration excitation force source, a transmission rod, spring pieces, and a shell. The absorption foots comprise washers, steel shells, and neodymium iron boron magnets. The excitation module is separately in threadedconnection with the supporting frame and the steel shell of the middle adsorption foot by the external thread of the shell, a nut, and the external thread of the transmission rod. The supporting frameis connected with the two side wing adsorption foots by screws and nuts. The adsorption type vibration exciter is simple in structure, small in size, light in mass, and large in excitation force. Theadsorption type vibration exciter can be directly adsorbed and fixed to a structure needing excitation vibration. According to the adsorption type vibration exciter, the shortcomings that a traditional inertial mass vibration exciter and a traditional electromagnetic exciter are large in size, large in mass, required to be externally supported, and the like are overcame, and the vibration of various engineering structures can be effectively excited. Therefore, the invention provides an excitation apparatus with strong applicability for vibration modal analysis, fault diagnosis and detection,and active vibration control of an actual engineering structure.

Description

technical field [0001] The invention belongs to the technical field of vibration mode analysis, fault diagnosis and detection, and active vibration control, and in particular relates to an adsorption vibration exciter. Background technique [0002] Structural vibration modal analysis is an important experimental method for designing and optimizing the dynamic response of engineering technology structures, and one of the conditions for the success of structural vibration modal analysis is to be able to excite vibrations in key parts of the structure without affecting the dynamic response of the structure itself. These requirements often have special requirements on the shape, mass and force of the exciter. [0003] Structural fault diagnosis and detection is an important technical means of engineering asset management. It diagnoses and detects the characteristics of faults through the vibration of the fault structure itself or the vibration generated by the vibrator. Using t...

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Problems solved by technology

[0005] Existing vibrators mainly include inertial mass exciters, electromagnetic exciters and electro-hydraulic exciters. Traditional inertial mass exciters generate inertial force by applying acceleration to the inertial mass, often only in resonance The area is effective, and the large inertial mass also brings difficulties to the installation; the electromagnetic exciter uses the electromagnetic force received by the alternating current in the magnetic field to generate excitation. This kind of exciter will appear abnormal when the coil movement displacement is large. Linear; the electro-hydraulic exciter has a complex structure and low operating frequency

These traditional exciters generally have the disadvantages of large mass, complicated installation, and need for external support, and can only generate one-way excitation force

[0006] In recent years, smart materials have been developed and applied rapidly, especially piezoelectric ceramics and magnetostrictive materials. This material can realize the mutual conversion of electromagnetic energy and mechanical energy. The elongation and compression of the material's own length can provide thrust and tension for the outside world. However, this kind of application is less in the exciter, and the exciter using ordinary piezoelectric ceramics has a small force and is not suitable for vibration excitation of many engineering structures; due to the development of material science and manufacturing technology, (super) magnetic The emergence and application of stretchable materials and stacked piezoelectric ceramics provide new ideas and methods for the design of piezoelectric exciters

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