The Structure Analysis And Thermal Analysis Of Laser Radar

The Laser Radar requires some analysis of its structure in the design phase, inorder to verify the feasibility of the design. In this paper, Modal analysis, HarmonicResponse analysis and Steady-state Thermal-Stress analysis of the Laser Radar structurewere accomplished using the ANSYS software based on the finite element method.In the Modal analysis, the method of free-meshing is selected, and the naturalvibration frequencies of the Laser Radar were obtained. The evaluation about theresonance of the Laser Radar is given in the normal work time according to its vibrationfrequencies. In Modal analysis, the deformation of the deep-groove ball bearingscontained in the structure of the laser radar is non-linear, but the deformation of theobject in the ANSYS Modal analysis is considered as linear. So the deep-groove ballbearings need to be predigested, and the combin7hinge elements in three-dimensionalwere adopted as springs which have rigidity in three-dimensional to predigest the fourdeep-groove ball bearings.The Harmonic Response analysis was completed based on the Modal analysis. TheAmplitude-Frequency characteristic curves of the Laser Radar were gotten in thisanalysis, and the peak points in the curves were the natural vibration frequencies. Theresults of the Modal analysis data and the Harmonic Response analysis data werecompared.Based on the method of the stress analysis, the Steady-state Thermal-Stressanalysis of the Laser Radar structure were accomplished using the direct coupled fieldsmethod, and this analysis is about thermal stress and the thermal deformation of theLaser Radar working in the extreme maximum temperature and the extreme minimumtemperature. The numerical value of the thermal stress and thermal deformation wasgotten, and the situation of the Laser Radar working in extreme temperatures wasevaluated according to the thermal stress and the thermal deformation.The stiffness measurement of the deep-groove ball bearings which sizes were61900and61816is accomplished as the needs of bearings simplify in the ANSYSanalysis. All stiffness parameters of the deep-groove ball bearings were measured instatic situation. The measurement about the axial and radial rigidity of two deep-grooveball bearings used a dynamometer and two lever dial gauge. In the measurement, fourbearing assembly structures were designed. Several curves of load-displacement were gotten in the measurement. The preload factor was considered in the radial stiffnessmeasurement, and the measured results under different preloads were gotten. Based onthe displacements under different loads, the stiffness of the deep-groove ball bearingsunder different loads is calculated. The laws of the bearing stiffness in different loadsand preloads were analyzed.The radial stiffness of the two deep-groove ball bearings in different sizes wascalculated based on the empirical formula of the deep-groove ball bearing stiffness. Thestiffness value gotten from the measurement was compared with the data gotten fromthe empirical formula, and the measurement errors were analyzed. Considering variousfactors, the stiffness of deep-groove ball bearings using in the bearings simplify inANSYS analysis was given.