| The elastic coupling is the power transmission component commonly used in shaft system.It is used to adjust the torsional vibration characteristics of the system,to change the natural frequency of the system to reduce vibration and avoid resonance,pulsating torque,it is widely used in the transmission shafting system with large disturbance torque,such as ships,mines and so on.Rubber is widely used as elastic element for high elastic coupling because of its special elasticity and damping properties.The thermal conductivity of the rubber material itself is extremely low,and a lot of thermal power is generated under dynamic torque.If the condition of heat generation and dissipation is not balanced,it will affect product performance,shorten product life and affect the reliability of shaft system operation.Therefore,it is of great practical significance to study the temperature field of high elastic coupling.The introduction of heat dissipation hole can improve the heat dissipation performance of the high elastic coupling,while saving the material to reduce the production cost.However,removing the material will reduce the torsion rigidity of the product,an increase in the amount of deformation can lead to a rise in heat.How to balance the conflict,make the product to achieve the light weight effect and improve the heat dissipation performance have significant engineering value.In view of the above two points,this paper conducted the following research.The ability to transfer torsion is the most important performance characterization of the coupling,the static torsion stiffness of the high elastic coupling is obtained based on the hyper-elastic constitutive model,it also provides data basis for the internal heat source in temperature field calculation.The three-dimensional steady-state temperature field and transient temperature field of high elastic coupling under dynamic loading are obtained based on the viscoelastic constitutive model,furthermore,the allowable perturbation torque of the high elastic coupling under different working conditions is analyzed.The material test provides basic information for studying the mechanical properties and temperature field of the high elastic coupling.Uniaxial tensile,biaxial tensile and plane tensile experiments were performed,a suitable hyper-elastic constitutive model is selected according to the experimental results.The dynamic thermal mechanical analysis was carried out to fit the formula between the damping loss factor and temperature,to provide data basis for the viscoelastic loss iteration,to reveal the mechanism of temperature rising under the dynamic load of the high elastic coupling.The static torsion stiffness experiment was carried out based on static torsion testing machine,the temperature field experiment was conducted based on dynamic testing machine.The feasibility of numerical simulation based on finite element method is verified by comparing the error of experimental value and simulation value.The temperature rise of rubber under different working conditions is studied,the prediction accuracy of the empirical formula which considering the correlation of damping factor and temperature was higher than formula which considering the damping factor was a constant.There was a quantitative relationship between the internal and surface maximum temperature rises of the rubber parts.The internal temperature rise can be predicted by measuring surface temperature or operating conditions.To monitor the performance of couplings and the reliability of rotation shafts.Based on optistruct topology optimization results,three new style elastic couplings with heat dissipation holes are designed.Statics analysis and temperature field analysis were carried out to determine the optimal opening direction.Study on the influence of aperture location,aperture size and aperture difference on the overall performance of the coupling,it provides a theoretical basis for the design and development of new couplings and other rubber-like products. |
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