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CN-116642409-B - Absolute displacement measuring device special for vibrating table and method for expanding vibration absorption band of vibration absorber

CN116642409BCN 116642409 BCN116642409 BCN 116642409BCN-116642409-B

Abstract

The invention discloses a special absolute displacement measuring device for a vibrating table, which comprises a base for fixing the device, a main body part for eliminating vibration and a clamping device for installing a sensor, wherein the base part is connected with a support through a disc spring, the clamping device at the upper part of the support is connected with the main body part through an upper pressing plate and a lower pressing plate and a screw, a mass block is arranged in the support and is connected with the clamping device through the spring, the sensor is installed on the upper surface of the base, an electromagnet bracket is fixed at the middle part of the base through threads, a wire arrangement groove is formed in the bottom of the electromagnet bracket, an electromagnet is installed at the upper part of the electromagnet bracket, and a signal acquired by the sensor is processed through a processing system and then transmitted to the electromagnet.

Inventors

  • LU XI
  • LI PAN
  • ZHANG JIANRUN

Assignees

  • 东南大学

Dates

Publication Date
20260508
Application Date
20230531

Claims (4)

  1. 1. The special absolute displacement measuring device for the vibrating table comprises a base part (1), a main body part (2) arranged on the base part (1), an acceleration sensor (15) and a processing system (5) for processing acceleration sensor signals, wherein a clamping device (3) is arranged at the top of the main body part (2), and the clamping device (3) comprises an eddy current displacement sensor (31) for measuring displacement, a screw (32) and a pressing plate (33), and is characterized in that the base part (1) is connected with the main body part (2) through a disc spring (4); A compression spring (23) is arranged in the main body part (2) along the length direction of the main body part (2), one end of the compression spring (23) is connected with the upper end of the main body part (2), and the other end is connected with a mass block (22); an electromagnet (14) capable of applying suction force to the mass block (22) is arranged below the mass block (22) on the base part (1); The acceleration sensor (15) transmits the obtained acceleration signal to the processing system (5), and the electromagnet (14) converts the signal transmitted by the processing system (5) into electromagnetic force to be applied to the mass block (22).
  2. 2. The device for measuring absolute displacement specially used for a vibrating table according to claim 1, wherein the formula for converting acceleration information into electromagnetic force information by the processing system (5) is as follows: ; wherein F is electromagnetic force, a is acceleration amplitude measured by an acceleration sensor (15); The frequency measured by the acceleration sensor (15), m 1 is the total mass of the main body part (2), the clamping device (3) and the disc spring (4), m 2 is the mass of the mass block (22), k 2 is the rigidity of the compression spring (23), and t is time.
  3. 3. The device for measuring absolute displacement specially used for vibrating tables according to claim 1, wherein only the mass block (22) is influenced by the magnetic force of the electromagnet (14) in the main body part (2), the clamping device (3) and the disc spring (4).
  4. 4. A method for expanding the vibration absorption frequency band of a vibration absorber is characterized in that based on the special absolute displacement measuring device for the vibration table, which is described in any one of claims 1-3, an external force is applied to a mass block (22) through an electromagnet (14) so that the device has the vibration absorption function at all frequencies of the vibration table; The motion differential equation of the two-degree-of-freedom undamped system is as follows: ; Order the , , ; The method can obtain the following steps: ; ; Wherein m 1 is the total mass of the main body part (2), the clamping device (3) and the disc spring (4), m 2 is the mass of the mass block (22), k 1 is the rigidity of the disc spring (4), k 2 is the rigidity of the cylindrical compression spring (23), x 1 is the displacement of the main body part (2), x 2 is the displacement of the mass block (22), F is electromagnetic force, and F 0 is the force applied by the vibrating table to the base part (1); Is equivalent mass, A 1 is the vibration amplitude of the main body part (2), A 2 is the vibration amplitude of the mass block (22), and t is time; a frequency measured for the acceleration sensor (15); the vibration amplitude A 1 of the main body part (2) is 0, namely When the vibration is 0, the dynamic vibration absorber achieves the vibration absorption effect, and the vibration absorber can provide different frequencies for the vibration table Is adjusted by vibration of (a) So that A 1 is kept to be 0, the effect of eliminating the vibration of the main body part (2) and the clamping device (3) is achieved at any frequency, and the clamping device (3) is kept relatively static with the ground.

Description

Absolute displacement measuring device special for vibrating table and method for expanding vibration absorption band of vibration absorber Technical Field The invention belongs to the technical field of dynamic vibration absorbers, and particularly relates to a special absolute displacement measuring device for a vibrating table and a method for expanding a vibration absorption band of the vibration absorber. Background At present, the dynamic parameters of a machine tool are often required to be measured through a vibrating table, and the vibration amplitude of a tool nose, a main shaft and other structures of the machine tool are required to be measured. The existing sensor is usually fixed on the vibrating table or the ground, the sensor fixed on the vibrating table vibrates along with the vibration of the vibrating table, and the sensor fixed on the ground also vibrates due to the influence of the vibrating table on the environment, so that the measurement accuracy of the sensor is affected. Disclosure of Invention The invention aims to solve the technical problems and provide a special absolute displacement measuring device for a vibrating table and a method for expanding a vibration absorption frequency band of a vibration absorber, wherein the absolute displacement measuring device is used for eliminating sensor vibration caused by vibration of various frequencies. By applying an applied load to the mass. The special absolute displacement measuring device for the vibrating table comprises a base part, a main body part, an acceleration sensor and a processing system, wherein the main body part is arranged on the base part, the processing system is used for processing signals of the acceleration sensor, the top of the main body part is provided with a sensor component used for measuring displacement, and the base part is connected with the main body part through a disc spring; a compression spring is arranged in the main body part along the length direction of the main body part, one end of the compression spring is connected with the upper end of the main body part, and the other end of the compression spring is connected with a mass block; an electromagnet capable of applying suction force to the mass block is arranged below the mass block on the base part; The acceleration sensor transmits the obtained acceleration signal to the processing system, and the electromagnet converts the signal transmitted by the processing system into electromagnetic force to be applied to the mass block. Further, the formula for converting acceleration information into electromagnetic force information by the processing system is as follows: wherein F is electromagnetic force, a is acceleration amplitude measured by an acceleration sensor; Is the frequency measured by the acceleration sensor, m 1 is the total mass of the main body part, the clamping device and the disc spring, m 2 is the mass of the mass block, k 2 is the compression spring rate, and t is the time. Furthermore, in the main body part, the sensor component and the disc spring, only the mass block is influenced by the magnetic force of the electromagnet. Further, the sensor assembly comprises an eddy current displacement sensor and a pressing plate for fixing the eddy current displacement sensor. The invention also discloses a method for expanding the vibration absorption frequency band of the vibration absorber, which comprises the steps of applying external force to the mass block through the electromagnet based on the special absolute displacement measuring device for the vibration table, so that the device has vibration absorption function at each frequency of the vibration table; The motion differential equation of the two-degree-of-freedom undamped system is as follows: Order the ,,; The method can obtain the following steps: Wherein m 1 is the total mass of the main body part, the clamping device and the disc spring, m 2 is the mass of the mass block, k 1 is the stiffness of the disc spring, k 2 is the stiffness of the cylindrical compression spring, x 1 is the displacement of the main body part, x 2 is the displacement of the mass block, F is the electromagnetic force, and F 0 is the force applied by the vibrating table to the base part; Is equivalent mass, A 1 is the vibration amplitude of the main body part, A 2 is the vibration amplitude of the mass block, and t is time; frequency measured by an acceleration sensor; The vibration amplitude A 1 of the main body part is 0, namely When the vibration is 0, the dynamic vibration absorber achieves the vibration absorption effect, and the vibration absorber can provide different frequencies for the vibration tableIs adjusted by vibration of (a)So that A 1 is kept to be 0, the effect of eliminating the vibration of the main body part 2 and the clamping device 3 is achieved at any frequency, and the relative rest of the eddy current displacement sensor and the ground is kept. The beneficial effects a