A rock mass structure shear wave transducer based on piezoelectric ceramic micro-displacement actuator and its preparation method
A technology of piezoelectric ceramics and micro-displacement, which is applied in the field of rock mass structure shear wave transducer and its preparation, and in the field of rock mass structure shear wave velocity testing. Pure rock materials and other issues, to achieve the effect of high excitation power, low signal frequency and good durability
Inactive Publication Date: 2020-04-24
WUHAN UNIV
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Problems solved by technology
[0005] Aiming at the problem that the vibration source excitation waveform is uncontrollable and unsuitable for pure rock materials in the current rock mass structure wave velocity testing method, the present invention provides a micro-displacement actuator based on piezoelectric ceramics suitable for rock mass structure shear wave velocity testing. The shear wave transducer of the device has the characteristics of large excitation energy, low frequency, controllable waveform, and can directly test pure rock materials. It can be used as a shear wave excitation device in rock engineering investigation work.
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[0030] In order to more clearly illustrate the embodiments of the present invention and / or the technical solutions in the prior art, the specific implementation manners of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings in the following description are only embodiments of the present invention, and those skilled in the art can also obtain other drawings based on these drawings and obtain other implementation.
[0031] Such as figure 1 and figure 2 As shown, a rock mass structure shear wave transducer based on piezoelectric ceramic micro-displacement actuators, including piezoelectric ceramic micro-displacement actuators 1, ceramic spacers and an external metal model frame 2, the external metal The model frame is a square frame, and the four corners of the square frame are provided with gaps 6 to facilitate the generation of shear deformation in the frame plane, and the inner sides of the two corners of the 4...
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The invention discloses a rock mass structure shear wave transducer based on a piezoelectric ceramic micro-displacement actuator and a preparation method. The shear wave transducer comprises the piezoelectric ceramic micro-displacement actuator, an aluminum oxide ceramic chip and an external metal model frame. The piezoelectric ceramic micro-displacement actuator consists of multiple layers of piezoelectric ceramic chips and an inner electrode; and a protective shell and a lead are arranged at the external. The external metal model frame is designed as a square frame according to the size of the piezoelectric ceramic micro-displacement actuator; and the piezoelectric ceramic micro-displacement actuator is mounted in the diagonal line of the square frame through pretightening force, and ismade of an aluminum alloy material or other metal with higher mechanical quality factor. The aluminum oxide ceramic chip is formed by cutting aluminum oxide ceramic. The shear wave transducer is excellent in durability, high in shock excitation power, low in signal frequency, suitable for rock materials and applicable to the rock soil structure shear wave speed testing.
Description
technical field [0001] The invention belongs to the technical field of transducer preparation of piezoelectric ceramic materials and related materials, and in particular relates to a rock mass structure shear wave transducer based on a piezoelectric ceramic micro-displacement actuator and a preparation method thereof, which is applicable to rock mass structures Shear wave velocity test. Background technique [0002] The shear wave transducer based on piezoelectric ceramic sheet is a new type of shear wave excitation device developed in recent years. It has the characteristics of small size, easy installation and operation, and high sensitivity. It is used in structural defect detection, structural damage identification and The field of structural health monitoring has potential application prospects. [0003] The wave velocity test of rock mass structure is of great significance in rock engineering investigation. There are single-hole method, cross-hole method and surface ...
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IPC IPC(8): B06B1/06G01N29/04G01N29/07G01N29/34
CPCB06B1/0644G01N29/043G01N29/07G01N29/34G01N2291/011G01N2291/0232G01N2291/0289
Inventor 李应卫王雪瑶马永力
Owner WUHAN UNIV