Thermal Imaging Clearance Monitoring Method Of Rotating Pair Fusion Mechanical Dynamics

The rotating pair is one of the most commonly used movement pairs in equipment manufacturing.Due to the requirements of production and matching,there is usually a clearance between the rotating pair elements.At the same time,as the working time of the rotating pairs increases,the distance increases beyond the specified level of adjustment tolerance,causing the rotating torque element to collide and chaos in the motion state,resulting in the wrong arrangement of the mechanism and vibration,and a sharp decrease in the reliability and durability of the precision device.As the clearance increases,the movement period of the rotating pair with clearance becomes more chaotic and complex.At this point,the monitoring accuracy of the clearance will be reduced.And for most of the equipment,the main transmission mechanism is in a closed space,so the monitoring cost is high.At the same time,there are not many direct monitoring methods for the rotating pair with clearance in the existing studies.So a thermal imaging gap monitoring method for rotating pairs is proposed in this paper,which integrates mechanical dynamics.And on the basis of the sine mechanism,building to a simulation experiment platform was to verify the monitoring method.The experimental results show that this method improves the anti-interference robustness and ensures the better monitoring effect on the monitoring model.The main contents of the paper are as follows:Step 1: dynamic analysis of the rotation joint based on the separation position of the rotation joint element.Taking the rotating pair in the sine mechanism as an example,according to the separation position of the elements in the rotating pair,it is proposed to consider the energy loss to conduct a dynamic analysis of the penetration depth of the rotating pair with a clearance,Moreover,it is difficult to measure due to the small penetration between the rotating sub-elements,so the error of the penetration is verified by the correction effect of the penetration depth on the calculation clearance of the rotating sub.And finally,5 representative dynamic parameters in the penetration depth analysis process are extracted as the raw materials for the subsequent auxiliary thermal imaging.Step 2: research on the thermal imaging clearance monitoring method of rotating pair combined with mechanical dynamics.The thermal imaging of the rotating pair under different clearance conditions is acquired through the infrared thermal imager.Monitoring the clearance of rotating pairs through image feature extraction and classification learning.In order to effectively extract the features of image and strengthen the "personality" of the image,attention mechanism,CNN of CBAM module,is introduced.Meanwhile,residual units are embedded in the network to prevent the gradient explosion and degradation phenomenon of the network model.However,when the thermal imaging of the rotating pair contains interference,it is not enough to rely on the CBAM module and the cross residual unit.Therefore,in order to solve the monotonicity,sparsity,robustness and poor anti-interference of a single data,it will be refined.After the dynamic data is extracted by the multi-layer perceptron,the highdimensional feature map and the thermal imaging high-dimensional feature map are fused,and then retrained and classified to verify that the effect of analyzing mixed data is better than that of single thermal imaging data.Step 3: experimental verification.This article is to verify the effectiveness of the proposed monitoring method,based on the sine mechanism,a clearance fault simulation experiment platform is built.And the required motion parameters and thermal imaging of the rotating pair are obtained through a laser displacement sensor and an infrared thermal imager.The final verification is based on the rotating pair elements.The penetration analysis error of the separation position and the effectiveness of the thermal imaging clearance monitoring method of the rotating pair fused with mechanical dynamics.