Assembly connection load intelligent control method based on shape memory alloy

Abstract

The invention discloses an assembly connection load intelligent control method based on shape memory alloy. The method comprises the following steps of (1) measuring parameters of a shape memory alloymaterial: determining required parameters, and determining parameter values; (2) building a screw bolt connection deformation compatibility equation: obtaining the initial effective length of a screwbolt, obtaining the effective length of the screw bolt after pre-tightening force exertion, obtaining balance relationship after the pre-tightening force exertion and using a displacement compatibility equation in any state; (3) calculating the connection rigidity of the screw bolt: calculating the rigidity of the screw bolt and the rigidity of a connected element; (4) building a screw bolt connection load control model: studying a shape memory alloy gasket connection loading path, obtaining the attributes of two SMA gaskets in an ultimate state at the restoring stage, and obtaining the temperature-restoring force relationship under the temperature rise state restoring condition; and (5) performing assembly connection intelligent control: monitoring a connection load, and controlling theconnection load. Due to the special mechanical characteristics of the shape memory alloy, the invention can provide a connection load intelligent control model and method for the assembly connection,and can provide the technical support for the screw bolt assembly connection.

Description

[0001] 【Technical field】 [0002] The invention belongs to the field of intelligent manufacturing, in particular to an intelligent control method for assembly connection load based on shape memory alloys. [0003] 【Background technique】 [0004] Bolt connection is widely used in complex precision electromechanical systems in the fields of aerospace, petrochemical, energy and electric power due to its convenient disassembly, good interchangeability, and easy access to high connection loads. Its connection stability is directly related to The reliability and durability of the service performance of the whole machine. Under extreme service environments such as high temperature, high pressure, and high-frequency vibration, the bolted connection structure is prone to failure problems such as creep relaxation and vibration self-relaxation, which makes it difficult to effectively maintain the connection load, thereby affecting the connection stability. According to statistics, the di...

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Problems solved by technology

Of the above two methods, although the former can prolong the service life of the equipment, it is powerless to reduce the preload force. The latter can compensate for the drop preload force, but it increases the equipment maintenance cost and affects the production efficiency, and is limited by the structural space. Restrict some parts that are difficult to perform secondary tightening

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