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针对刮板输送机卡链工况,在考虑输送机中部槽的弹性和间隙、链轮与链条啮合特性等因素的基础上,建立了刮板输送机非线性动力耦合模型;通过仿真分析,得到了卡链工况下链条的最大动载;以仿真得到的最大动载为输入载荷,通过Ansys仿真分析了圆环链的受力状态。 相似文献
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以刮板输送机链轮和链条啮合传动为研究对象,分析了刮板输送机无载和有载工况下链条的动力学特性,并运用数值仿真的方法对刮板输送机特殊点处的链条速度和张力进行了仿真分析。结果表明:链条多边型效应的最主要的影响参数是链轮齿数,并且刮板输送机运行平稳性与链轮齿数成正比,13齿链轮稳定性远强于9齿链轮刮板输送机;多边形效应在有载侧对链条张力波动的影响比无载侧明显;多边形效应反应灵敏度与刮板输送机链条长度成反比,此研究结果为刮板输送机链轮和链条的选取提供了一定的理论依据,并为其动态特性研究提供了研究方法和理论基础。 相似文献
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矿用刮板输送机圆环链传动系统动力学行为研究 总被引:20,自引:0,他引:20
工作面刮板输送机是关键的煤矿综采设备之一,其采用圆环链传动实现对开采煤炭的输送,具有大载荷、高功率、长距离等特点。通过有限段法将刮板输送机的圆环链传动系统离散成Kelvin-Vogit模型,重点考虑其纵向动力学特性,利用Matlab/Simulink建立考虑链传动预紧力和双电动机驱动的系统动力学仿真模型。基于非线性有限元软件Abaqus分析链轮和链环的接触特性,并得到纵向动力学模型所需的链轮和链环的刚度系数。针对刮板输送机链传动系统的满载启动、自由停机和卡链等工况进行动力学仿真计算,计算得到了确保链条张力大于0所需的最小预紧力和链条预紧力对链条张力、速度等参数的影响。为刮板输送机链传动系统关键部件的优化设计和参数匹配提供理论依据。 相似文献
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根据刮板输送机运行时的实际工况,提出了一种解决传统链环张力监测装置需要定期更换电源模块,影响张力监测准确性的基于压电振动俘能的刮板输送机自动张力监测装置。对张力监测原理、监测装置布置结构以及压电振动俘能装置的工作原理、布置结构等进行了研究,结果表明:链传动系统工作时的最大张力约为125k N,其运行阻力约为13 k N,与刮板输送机运行实际工况一致,验证了该监测装置的可靠性。 相似文献
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For a Jeffcott rotor system with a 45° slant crack on the shaft, the motion equations are established with four directions, i.e. two transversal directions, one torsional direction and one longitudinal direction. It can be seen from the deducing process of the stiffness with the strain energy release approach that there are coupling stiffnesses of bending–torsion, bending–tension and torsion–tension for the slant-cracked shaft and only bending–tension for the transverse-cracked one. The paper shows that besides the coupling stiffnesses, there is bending–torsion coupling caused by the eccentricity. All these couplings affect the responses of the slant-cracked shaft and the transverse-cracked one. Comparing responses of a cracked shaft with an open crack model and those with a breathing crack model finds that there are the same prominent characteristic frequencies for these two kinds of shafts, even though the cracked shaft with a breathing crack model behaves much more non-linear than that with an open crack model. Therefore, almost all studies in this paper adopt the open crack model since it needs taking much longer time to compute responses of a breathing cracked shaft than that of an open cracked shaft. Analyses of steady responses indicate that the combined frequencies of the rotating speed and the torsional excitation in the transversal response and the frequency of the torsional excitation in the longitudinal response can be used to detect the slant crack on the shaft of the rotor system. 相似文献
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弹性联轴器对车辆动力传动系统扭振特性影响研究 总被引:6,自引:0,他引:6
车辆动力传动系统属于多自由度扭转振动系统,其轴系的扭转振动是影响其系统安全的重要因素之一。文中通过建立某车辆动力传动系统的多自由度质量-弹性-阻尼动力学模型,根据振动理论并依托系统扭振实验研究了3种弹性联轴器对该系统扭振特性的影响规律,着重分析联轴器刚度和阻尼对系统固有频率、固有振型、强迫振动响应等模态参数的影响。通过对比研究获得如下结论.匹配的弹性联轴器可以调整系统的低阶固有频率、避免系统发生共振、衰减共振振幅和发动机输出力矩的幅值不均匀性,即改善动力传动系统的扭振特性。 相似文献
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对装有n级橡胶阻尼式扭转减振器的发动机曲轴系统,建立其扭振分析的通程化模型。该模型适用于任意气缸数的发动机(V型或直列)曲轴系统。以优化参数的单级、两级并联和两级串联扭转减振器为例,对装有优化参数的减振器的发动机曲轴扭振进行计算比对,分析各减振器对发动机曲轴扭振的影响。计算结果表明,以控制曲轴在单简谐激励下各共振峰最小为优化目标选定的减振器,需要经过在实际发动机激励下进行强迫扭转振动分析验证后,方能实现最优选择。 相似文献
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针对货车非线性悬架系统,提出了一种确定货车传动系统扭转疲劳载荷的模拟方法。建立了4自由度双轴货车振动模型,以标准路面功率谱反推算法得到路面不平度为随机输入,用MATLAB/Simulink仿真计算得到车轮上的垂直随机动载荷,并将其转化为驱动轮上的扭转载荷。计算载荷可以用来编制货车传动系统扭转疲劳试验载荷谱、估计零部件的疲劳寿命。 相似文献
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针对曲轴扭转振动与整机辐射噪声问题,以某直列四缸发动机曲轴系统为研究对象,基于AVL Excite软件,在匹配扭振减振器(torsional vibration damper,TVD)与不匹配TVD两种情况下,采用弹性流体动力学模型轴承计算模型研究了曲轴扭振对机体所受激励与轴瓦表面压力分布的影响;并且在两种情况下,分别对曲轴扭振与车内噪声进行了试验测试,测试与主观评价表明,匹配TVD情况下曲轴扭振幅值降低,车内原有异响声明显改善。研究分析结果表明,扭振会使得曲轴模态频率附近范围内机体所受激励幅值增加,改变轴瓦表面载荷的幅值与分布规律,导致发动机乃至整车产生异响。 相似文献
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周向长弧形弹簧式双质量飞轮(DMF-CS)的扭转特性是扭转刚度及阻尼作用的综合效果,能更贴切地反映DMF-CS的隔振、阻振特性。对DMF-CS的扭转特性进行仿真分析,获得了不同摩擦因数下的扭转特性迟滞非线性曲线。仿真结果表明其滞回面积随摩擦因数的增大而增大,且以无摩擦时的扭矩曲线为基架。根据仿真分析结果建立了该DMF-CS的迟滞非线性扭转特性模型。进行了该DMF-CS扭转特性试验,应用试验数据对建立的模型进行了参数识别,模型识别结果与试验结果较接近,从而验证了模型的可靠性。 相似文献
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Torsional vibration of flexible drive chain is a historical issue. With the maximization development and the rotating machinery high-speed operation, the drive chain systems of large-scaled units become more and more complex, which makes the torsional vibration problems becoming increasingly prominent in recent years. This article deeply analyzed the small signal stability of large-scaled WECS based on CMT, elaborated the torsional vibration mechanism and reasons for the first time and pointed out torsional vibration is caused by the disturbance wind and the DPC strategy. The disturbance wind is an external stimulus and can produce a low-frequency torsional vibration at the same frequency as wind speed. The DPC could weaken the drive chain damping. If the total damping of drive chain is negative, the unstable torsion vibration will occur. And if the drive chain is still a under-damped dynamic, the high-frequency torsional vibration at natural frequency will be generated. Therefore, large-scaled WECS must have damping control. This study found that appropriate enhancing drive chain stiffness could reduce low-frequency torsional vibration caused by wind speed. Therefore, a damping and stiffness compensation control method was proposed to suppress the torsional vibration. Compared with the conventional damping control, the new method not only can suppress the high-frequency torsional vibration but also has a good restraining effect on the low-frequency torsional vibration. Furthermore, the detailed design procedures including the calculation of injection damping and stiffness were given in this paper. Finally, the correctness and effectiveness of our analysis were further verified by the simulation experiments 相似文献