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Negative feedback control loading device and method for ultrasonic excitation of concrete components

A loading device and concrete technology, applied in program control, computer control, general control system, etc., can solve the problems of unstable coupling load, difficult to adapt to the large size and irregular shape of concrete structures, and achieve easy layout, all-round and The effect of flexible detection and simple operation of the device

Active Publication Date: 2020-07-03
NANJING HYDRAULIC RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the applied coupling load is unstable in the prior art, or it is difficult to adapt to the large size and irregular shape of the concrete structure, and proposes a negative feedback control loading device and method for ultrasonic excitation of concrete components

Method used

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  • Negative feedback control loading device and method for ultrasonic excitation of concrete components
  • Negative feedback control loading device and method for ultrasonic excitation of concrete components
  • Negative feedback control loading device and method for ultrasonic excitation of concrete components

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A negative feedback control loading device for ultrasonic excitation of concrete components, comprising: a base 101, an electromagnet 102, a support sleeve 103, a screw rod 104, a high-frequency dynamic miniature pressure sensor 105 and a current control module 106, the lower surface of the base 101 and the The detection objects are bonded with adhesive, the upper surface of the base 101 is magnetically adsorbed to the lower surface of the electromagnet 102, the upper end of the electromagnet 102 is fixedly connected with the lower end of the support sleeve 103, and the inner thread of the upper end of the support sleeve 103 is sleeved with a screw rod 104, the spiral The rod 104 is provided with a self-locking mechanism and the lower end is fixedly equipped with a high-frequency dynamic micro-pressure sensor 105, the high-frequency dynamic micro-pressure sensor 105 is electrically connected with the current control module 106, the electromagnet 102, the support sleeve 10...

Embodiment 2

[0041] The differences based on Example 1 are:

[0042] A negative feedback control loading method for ultrasonic excitation of concrete components, applied to a negative feedback control loading device for ultrasonic excitation of concrete components, comprising the following steps:

[0043] S1. Fix the base 101 on the surface of the member to be tested, place the main body of the loading limiter on the base 101, connect the circuit of the negative feedback loading device, and make the main body of the loading limiter be attracted to the base 101 by magnetic force;

[0044] S2. Place the exciter in the main body of the loading limit sleeve, input the signal of the magnetic attraction force to be applied to the current control module, and generate a corresponding magnetic attraction force between the main body of the loading limit sleeve and the base 101;

[0045] S3. Rotate the screw rod 104 in the main body of the loading limit sleeve to make it resist and press the vibrator...

Embodiment 3

[0052] The differences based on Examples 1 and 2 are:

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Abstract

The invention discloses a concrete component ultrasonic excitation negative feedback control loading device and method, and belongs to the technical field of civil engineering and concrete buildings.The concrete component ultrasonic excitation negative feedback control loading device and method can stably apply magnetic attraction force strictly as expected, the coupling pressure is controlled byusing the magnetic attraction force as an upper limit, an excitation force amplitude necessary for the ultrasonic generation system to normally output wave excitation is used as a variable, and thusthe ultrasonic generation circuit in excitation can be always close to the best operating point. When the magnetic attraction force is completely converted into the coupling pressure to act on an exciter, the attenuation of the magnetic attraction force (the magnetic attraction force is maximum when the electromagnet is tightly contacted with the pedestal, and is reduced along with the increasingseparation distance between the electromagnet and the pedestal) generated by periodical change of the distance between the main body part and the pedestal of the loading limit sleeve caused by the excitation stroke of the excitatory can be compensated.

Description

technical field [0001] The invention relates to the technical fields of civil engineering and concrete construction, in particular to a negative feedback control loading device and method for ultrasonic excitation of concrete components. Background technique [0002] Cracks are the most typical and common form of concrete structural diseases, which profoundly affect the durability and stability of structures. Large-scale visible cracks are formed by the development of micro-cracks. Timely detection (non-detection) cracks and early prevention and control of structural micro-cracks can avoid engineering accidents, which has very important technical value. At present, commonly used concrete defect detection methods, such as ultrasonic testing, radar, and crack microscopy, are all used to detect parameters such as the width of cracks that have been found, and do not have the ability to actively find micro-cracks. Ultrasound-induced infrared thermography has been proven capable ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/72G05B19/042
CPCG01N25/72G05B19/0423
Inventor 汤雷贾宇张盛行王海军官福海高军军王玉磊
Owner NANJING HYDRAULIC RES INST