采煤机截割部壳体动态特性及热—结构耦合分析
发布时间：2019-02-16 11:40
【摘要】：随着我国薄煤层资源开采量的日益提高,薄煤层采煤机的工作安全可靠性变得尤为重要,由于工作环境恶劣,薄煤层采煤机在工作过程中会产生剧烈的振动以及随之而来的噪声、瞬时冲击力引起的局部破坏、长时间运行导致的高温胶合变形等问题,以上种种现象会加速采煤机的疲劳破坏,对操作人员的安全造成威胁。因此,利用虚拟样机技术模拟真实环境下的采煤机工作状态,分析研究其动态特性及结构强度可以有效地解决上述问题或提早对问题进行预测,避免不必要的损失。本文以某新型薄煤层采煤机为研究对象,以多体动力学理论、振动学理论、多场耦合分析理论等为基础,利用Pro/E.ADAMS和ANSYS Workbench等软件实现了对新型薄煤层采煤机截割部壳体的协同仿真。为研究采煤机工作时的稳定性,对截割部壳体进行了模态分析和谐响应分析,得到壳体的固有模态、相应振型和正弦载荷激励下壳体关键位置的位移响应曲线,与截割部各种激励频率进行比较分析,得到采煤机截割部壳体振动特性与激励频率的关系。考虑到采煤机工作过程中可能出现的强度不足等问题,对壳体进行了热-结构耦合分析,首先通过计算齿轮摩擦发热、轴承摩擦发热、齿轮搅油发热、油封摩擦发热等对截割部进行热分析,得到壳体的温度分布云图,在此基础上进行热-结构耦合分析,得到壳体的应力及变形云图,并与未考虑温度场时的分析结果进行比较,得到了温度场对壳体结构强度的影响。对壳体进行疲劳寿命预测,将疲劳寿命不足位置进行结构优化改进,增大部分过渡圆角半径后的壳体应力集中明显消失,热-结构耦合应力减小,疲劳寿命显著提高,可以满足恶劣工况下的使用需求。本文研究采煤机截割部壳体可靠性时,全面考虑了壳体动态特性和多场耦合条件下壳体的结构刚度和强度,使分析预测更加准确可靠,为采煤机截割部壳体的动态特性研究及多场耦合分析提供了新的方法。
[Abstract]:With the increasing exploitation of thin coal seam resources in our country, the safety and reliability of thin coal seam shearer becomes more and more important, because of the bad working environment. In the working process of thin coal seam shearer, it will produce violent vibration and noise, local damage caused by instantaneous impact force, high temperature gluing deformation caused by long time operation, and so on. The above phenomena will accelerate the fatigue damage of shearer and threaten the safety of operators. Therefore, using virtual prototyping technology to simulate the working state of shearer in real environment, analyzing and studying its dynamic characteristics and structural strength can effectively solve the above problems or predict the problems earlier, and avoid unnecessary losses. In this paper, a new type of thin coal seam shearer is taken as the research object, based on multi-body dynamics theory, vibration theory, multi-field coupling analysis theory, etc. The collaborative simulation of the cutting part shell of a new thin coal seam shearer is realized by using Pro/E.ADAMS and ANSYS Workbench software. In order to study the stability of the shearer, the modal analysis of the cutting part shell is carried out, and the natural mode, the displacement response curve of the critical position of the shell under the excitation of the corresponding mode and the sinusoidal load are obtained. The vibration characteristics of the shell of the cutting part of the shearer are compared with the excitation frequency of the cutting part, and the relation between the vibration characteristics and the excitation frequency is obtained. Considering the problem of insufficient strength in the shearer, the thermal-structural coupling analysis of the shell is carried out. Firstly, the friction heat of the gear, the friction heat of the bearing and the heat of the oil stirring of the gear are calculated. The thermal analysis of the cutting part was carried out, and the temperature distribution cloud diagram of the shell was obtained. On this basis, the thermo-structural coupling analysis was carried out, and the stress and deformation cloud diagrams of the shell were obtained, and the results were compared with the analysis results without considering the temperature field. The influence of temperature field on the strength of shell structure is obtained. The fatigue life of the shell is predicted, and the structure of the shell with insufficient fatigue life is optimized and improved. The stress concentration of the shell decreases obviously after increasing the partial transition radius, the coupling stress of the thermal-structure decreases, and the fatigue life of the shell increases significantly. Can satisfy the use demand under the bad working condition. In this paper, the dynamic characteristics of the shell and the structural stiffness and strength of the shell under the condition of multi-field coupling are considered in order to make the analysis and prediction more accurate and reliable when the reliability of the cutting part shell of the shearer is studied. It provides a new method for the study of dynamic characteristics and multi-field coupling analysis of cutting part shell of shearer.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD421.6
本文编号：2424407
[Abstract]:With the increasing exploitation of thin coal seam resources in our country, the safety and reliability of thin coal seam shearer becomes more and more important, because of the bad working environment. In the working process of thin coal seam shearer, it will produce violent vibration and noise, local damage caused by instantaneous impact force, high temperature gluing deformation caused by long time operation, and so on. The above phenomena will accelerate the fatigue damage of shearer and threaten the safety of operators. Therefore, using virtual prototyping technology to simulate the working state of shearer in real environment, analyzing and studying its dynamic characteristics and structural strength can effectively solve the above problems or predict the problems earlier, and avoid unnecessary losses. In this paper, a new type of thin coal seam shearer is taken as the research object, based on multi-body dynamics theory, vibration theory, multi-field coupling analysis theory, etc. The collaborative simulation of the cutting part shell of a new thin coal seam shearer is realized by using Pro/E.ADAMS and ANSYS Workbench software. In order to study the stability of the shearer, the modal analysis of the cutting part shell is carried out, and the natural mode, the displacement response curve of the critical position of the shell under the excitation of the corresponding mode and the sinusoidal load are obtained. The vibration characteristics of the shell of the cutting part of the shearer are compared with the excitation frequency of the cutting part, and the relation between the vibration characteristics and the excitation frequency is obtained. Considering the problem of insufficient strength in the shearer, the thermal-structural coupling analysis of the shell is carried out. Firstly, the friction heat of the gear, the friction heat of the bearing and the heat of the oil stirring of the gear are calculated. The thermal analysis of the cutting part was carried out, and the temperature distribution cloud diagram of the shell was obtained. On this basis, the thermo-structural coupling analysis was carried out, and the stress and deformation cloud diagrams of the shell were obtained, and the results were compared with the analysis results without considering the temperature field. The influence of temperature field on the strength of shell structure is obtained. The fatigue life of the shell is predicted, and the structure of the shell with insufficient fatigue life is optimized and improved. The stress concentration of the shell decreases obviously after increasing the partial transition radius, the coupling stress of the thermal-structure decreases, and the fatigue life of the shell increases significantly. Can satisfy the use demand under the bad working condition. In this paper, the dynamic characteristics of the shell and the structural stiffness and strength of the shell under the condition of multi-field coupling are considered in order to make the analysis and prediction more accurate and reliable when the reliability of the cutting part shell of the shearer is studied. It provides a new method for the study of dynamic characteristics and multi-field coupling analysis of cutting part shell of shearer.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD421.6
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