Vibration isolation mechanism based on ratio electromagnet

Abstract

The invention discloses a vibration isolation mechanism based on a ratio electromagnet. The vibration isolation mechanism comprises a load rod, a first balance mechanism, the ratio electromagnet, a second balance mechanism, a micrometric displacement sensor and a PID operation control unit. The longitudinal central axis of the load rod coincides with the longitudinal central axis of the ratio electromagnet. One end of the load rod is used for bearing a system where vibration isolation is going to be conducted. The first balance mechanism and the second balance mechanism are used for providing the horizontal tension capable of limiting the load rod on the longitudinal central axis of the ratio electromagnet. The output end of the micrometric displacement sensor is connected with the PID operation control unit. The output end of the PID operation control unit is connected with the ratio electromagnet. The PID operation control unit is used for outputting a closed-loop control signal after conducting PID operation on the longitudinal opposite position. The ratio electromagnet works in a linear working area under the effect of the closed-loop control signal, outputs the force unrelated to displacement, and acts on the load rod so that the load rod can be in a suspended state and low-frequency vibration isolation can be achieved. The requirement for vibration isolation during high-precision absolute gravity measurement can be met.

Description

technical field [0001] The invention belongs to the technical field of vibration isolation, and more specifically relates to a vibration isolation mechanism based on a proportional electromagnet. Background technique [0002] The force exerted on an object by the attraction of the earth is called gravity. The gravitational object is the earth. The direction of gravity is always straight down. The magnitude of the gravitational force on an object is proportional to the gravitational acceleration g. An absolute gravimeter is an instrument that measures the acceleration due to gravity g. The vibration isolation mechanism is one of the key components of the absolute gravimeter. [0003] The FG5 absolute gravimeter produced by the Micro-g LaCoste company in the United States is one of the most accurate commercially produced absolute gravimeters. The mass block can effectively measure the falling distance of about 0.25m, and the total uncertainty of the measurement results can...

AI Technical Summary

Problems solved by technology

The mechanical structure and system of Micro-g LaCoste's super spring are very complex, requiring precise design and processing, and the cost is very high

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