Magnetic fluid acceleration sensor based on first-order buoyancy principle

An acceleration sensor and magnetic liquid technology, applied in the direction of measuring acceleration, speed/acceleration/shock measurement, instruments, etc., can solve the problems of difficult flow of magnetic liquid, weak signal, and failure to be applied, etc., to achieve enhanced frequency difference, stable suspension, Enhance the effect of the transmitted signal

Inactive Publication Date: 2015-08-19
BEIJING JIAOTONG UNIV
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Problems solved by technology

[0003] The technical problem to be solved in the present invention is that the existing magnetic liquid damping shock absorber adopts the second-order buoyancy principle of magnetic liquid, which easily causes the problems of difficult flow of magnetic liquid and weak signal, which makes it impossible to be applied in engineering practice

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  • Magnetic fluid acceleration sensor based on first-order buoyancy principle

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Embodiment Construction

[0012] The present invention will be further described with accompanying drawing as specific embodiment:

[0013] A magnetic liquid acceleration sensor based on the principle of first-order buoyancy, such as figure 1 , the sensor device includes: a first permanent magnet 1 , a casing 2 , a mass block 3 , an end cover 4 , a second permanent magnet 5 , a magnetic liquid 6 , an upper coil 7 , and a lower coil 8 .

[0014] Connections between the parts making up the device:

[0015] First inject the magnetic liquid 6 into the shell 2, and stop injecting the magnetic liquid when the height of the magnetic liquid 6 is half of the height of the shell 2. Then put the mass block 3 into the casing 2, and after the mass block 3 is completely immersed in the bottom of the casing 2, continue to inject the magnetic liquid 6 into the casing 2 until it is full. Then the end cover 4 is fixedly connected to the housing 2, and the connection method can be welding, bonding or threaded connectio...

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Abstract

A magnetic fluid acceleration sensor based on a first-order buoyancy principle belongs to the field of mechanical engineering measurement. The problem that the existing magnetic fluid acceleration sensor cannot be applied in engineering practice due to a variety of structure problems is solved successfully. The device comprises a first permanent magnet (1), a shell (2), a mass block (3), an end cover (4), a second permanent magnet (5), magnetic liquid (6), an upper coil (7), and a lower coil (8). When acceleration is produced outside, the nonmagnetic mass block moves in a cavity, the volume distribution of the magnetic liquid (6) in the shell (2) changes, a signal is output, and first-order buoyancy formed by the first permanent magnet (1) and the second permanent magnet (5) inside the magnetic liquid (6) causes frequency difference between the mass block (3) and the shell (2). Thus, the sensitivity of the sensor is improved.

Description

technical field [0001] The invention belongs to the field of mechanical engineering measurement. Background technique [0002] Acceleration sensors are second only to pressure sensors in terms of sales volume, and are widely used in various fields such as transportation, biomedicine, oil exploration, and military industry. With the continuous development of science and technology, people's demand for acceleration sensors with high sensitivity, high reliability, high resolution and good linearity is increasing. The magnetic liquid acceleration sensor has high sensitivity to inertial force, and has the advantages of simple structure, small size, no mechanical loss and long life. However, the existing magnetic liquid acceleration sensor cannot be applied in engineering practice due to various structural problems. The specific problems are as described in the patents of application number CN103149384A and application number CN103675351A. The device described in this patent adop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P15/105
Inventor 李德才姚杰姜华伟黄串
Owner BEIJING JIAOTONG UNIV
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