Differential piezoelectric type three-dimensional acceleration sensor

Abstract

The invention provides a differential piezoelectric type three-dimensional acceleration sensor and belongs to the field of three-dimensional acceleration sensors. The sensor comprises a base, a mass block and piezoelectric patches, wherein the base and the mass block are in square, the mass block is sleeved in the base, a boss is arranged on four sides of the mass block respectively, each of the piezoelectric patches is attached to each of bosses, a third piezoelectric patch, a fourth piezoelectric patch, a fifth piezoelectric patch and a sixth piezoelectric patch are attached to the left, the right, the front and the rear of the mass block respectively, a first piezoelectric patch is attached to the upper side of the mass block, a second piezoelectric patch is attached to the lower side of the mass block, the first piezoelectric patch and the second piezoelectric patch are connected to a first different amplifying circuit, the third piezoelectric patch and the fourth piezoelectric patch are connected to a second different amplifying circuit, and the fifth piezoelectric patch and the sixth piezoelectric patch are connected to a third different amplifying circuit. The sensor is simple in structure, small in size and capable of achieving differential accurate measurement of three-dimensional acceleration through piezoelectric patches.

Description

[0001] technical field [0002] The invention relates to a three-dimensional acceleration sensor, in particular to a differential piezoelectric three-dimensional acceleration sensor. Background technique [0003] Three-dimensional acceleration sensors are widely used in various fields. Especially in the field of bearing fault diagnosis, according to statistics, many faults in rotating machinery are closely related to rolling bearings. Among them, 70% of mechanical faults are caused by vibration faults, and 30% of vibration faults are caused by rolling bearings. When the bearing is defective, the function of the system will be reduced or lost, and serious or even catastrophic accidents will occur. Therefore, monitoring the vibration status of bearings is beneficial to discovering early failures of bearings, preventing safety accidents and reducing economic losses. [0004] Vibration signals are usually acquired through accelerometers. The acquisition of bearing vibration sig...

AI Technical Summary

Problems solved by technology

The acquisition of bearing vibration signals is mostly based on the vibration signals obtained by one-dimensional acceleration sensors or two-dimensional acceleration sensors, but they cannot fully express the vibration state of the bearing in all directions. Using multiple acceleration sensors to obtain the vibration state of the bearing in all directions requires more Large installation space and higher installation conditions

However, the current three-dimensional piezoelectric acceleration sensors have disadvantages such as complex structure, large volume, low output sensitivity and high installation requirements.

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