共查询到19条相似文献,搜索用时 62 毫秒
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基于对转子系统振动进行控制的目的,本文研究了电磁阻尼器结构参数的优化设计,建立了一种不完全对称的电磁阻尼器的结构模型。将这种不完全对称的电磁阻尼器应用于滑动轴承支撑的转子系统上,计算机仿真证明这种不完全对称的电磁阻尼器对转子系统的振动控制是有效的。 相似文献
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主动弹支干摩擦阻尼器控制转子突加不平衡响应的研究 总被引:3,自引:0,他引:3
建立了弹支干摩擦阻尼器——转子系统突加不平衡响应的计算模型,理论分析和实验验证了转子系统突加不平衡响应特性。结果表明,主动弹支干摩擦阻尼器能够有效控制转子系统突加不平衡的振动响应;并且,当动、静摩擦片之间压紧力增大时,将随之使振动幅值减小、瞬态过程缩短。实验与理论分析结果吻合较好。 相似文献
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被动式电磁阻尼器对转子振动进行控制的机理探讨和实验研究 总被引:2,自引:0,他引:2
设计了一种新型的被动式电磁阻尼器,其采用直流稳压电源供电,无需控制。本文对该阻尼器用于转子振动控制的机理进行了探讨,实验研究了该阻尼器的减振、增稳效果。结果表明,该阻尼器减振效果明显,结构简单,性能可靠,成本低,有推广应用价值。 相似文献
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以多支承转子 轴承 弹性基础系统为研究对象,对多支承转子系统某支承处轴承载荷变化引起不同支承点处轴及轴承的耦合振动响应进行了研究。首先,建立了多支承转子系统支承间的耦合振动模型,并进行了仿真和试验,耦合振动模型考虑了每个支承处的油膜耦合效应,通过轴承载荷敏感度矩阵得到各支承耦合力;然后,利用龙格库塔法对油膜刚度为定刚度和动刚度两种情况下的转子系统进行了数值分析及仿真;最后,在8支承转子试验台上进行试验,采取改变某一支承处的位移来得到轴承载荷的变化,并提取各支承处的振动信号。结果表明,轴承位置在稳态和瞬态两种情况下改变时振动响应明显不同,油膜刚度为动刚度的分析结果更为合理。 相似文献
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径向电涡流阻尼器对柔性转子系统振动的控制 总被引:1,自引:0,他引:1
为了抑制转子系统的振动和研发高性能的转子系统振动主动控制执行元件,基于电涡流原理提出了一种新型的转子系统径向电涡流阻尼器,在一个带有双盘的柔性转子系统上详细地测量了不同磁场强度条件下径向电涡流阻尼器支撑的转子系统在非旋转状态下的传递函数、在恒定转速下的运动轨道以及在慢加速运行过程中的不平衡响应曲线,并进行了利用径向电涡流阻尼器对转子系统的振动进行分段和比例控制的有效性试验。结果表明了这种新型的径向电涡流阻尼器不仅具有结构简单、无需流体介质、无机械接触等特点,而且其动力特性还容易控制,在设计合理的条件下能够显著地减小转子系统的振动,是一种被动和主动兼备具有良好发展和应用前景的转子系统阻尼结构。 相似文献
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由于高转速和大功率的需要,现有很多转子设备往往是基于滑动轴承设计的,因而由不平衡故障引起的振动成为影响这些设备安全运行的关键因素。为了探究整体式挤压油膜阻尼器(ISFD)对滑动轴承转子系统因不平衡故障产生振动的抑制效果,对安装有ISFD阻尼支承后的转子系统的不平衡振动响应进行了研究。首先,以实验室现有的转子试验台为基础,设计了安装有滑动轴承的ISFD阻尼支承结构,对ISFD的减振机理进行了介绍;然后,运用有限元方法,研究了ISFD弹性体的径向刚度特性;最后,搭建了单跨对称转子试验台,采用试验的方式,研究了该ISFD阻尼支承结构对转子不平衡振动的抑制效果。研究结果表明:在较宽的载荷范围内,ISFD弹性体的位移值与静载荷呈线性关系,具有优良的线性刚度特性;ISFD具有优良的阻尼特性,可以较好地抑制不同转速工况下滑动轴承转子系统的不平衡振动,在1 800 r/min的工况下,转子在x和y方向的振动降幅分别为38.4%和49.4%;ISFD阻尼支承可以有效抑制滑动轴承转子系统不平衡故障导致的工频振动,在1 600 r/min的工况下,转子在x和y方向的工频振动降幅分别为19.5%和29.4%,... 相似文献
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发动机转子-滚动轴承系统的振动性能研究 总被引:2,自引:1,他引:1
针对发动机转子 滚动轴承系统建立了有限元模型,将弹性轴段、刚性圆盘和弹性支承的动力方程集结后得到系统振动方程,分析计算了支承刚度对系统固有频率的影响。将转子不平衡惯性力和轴承支反力作为激励,求解了系统的稳定响应,得出了合理设计支承刚度和阻尼,可以改善转子系统的振动特性的结论。通过转子系统模拟实验,对该结论进行了验证。 相似文献
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采用基于正弦扫频技术的恒位移测试方法来获取转子支承系统在一系列恒定位移幅值响应下的频响函数,并辨识转子支承的非线性刚度参数。首先对转子支承系统进行两端支承状态下的模态分析,得到转子系统在线性支承条件下的模态;然后采用正弦激励进行仿真测试,对转子支承进行不同水平的恒位移测试,通过模态分析得到不同响应水平下的模态参数,建立等效非线性参数与响应之间的关系,再结合等效线性化理论,识别非线性刚度参数。 相似文献
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Stability and bifurcation of a rigid rotor in cavitated squeeze-film dampers without centering springs 总被引:1,自引:0,他引:1
Jawaid Iqbal Inayat-Hussain Hiroshi Kanki Njuki W. Mureithi 《Tribology International》2001,34(10):2369
The continuation method is employed to investigate the non-linear response of a rigid rotor supported by squeeze-film dampers without centering springs. The Floquet transition matrix method, which was used to examine the stability of the periodic response, indicated that the rotor may lose stability via period-doubling and saddle-node bifurcations at certain parameter values. The continuation method, which allows for switching from one solution branch to another, enabled the solution branches of period-two, four, eight and sixteen to be mapped out. By simultaneously varying the unbalance and bearing parameters, the combination of these two parameters that avoids the occurrence of non-synchronous vibration or jump phenomena in this system was determined. 相似文献
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This study analyzes the dynamic behavior of a flexible rotor supported by two couple-stress fluid film journal bearings with non-linear suspension systems. The analysis employs a short journal bearing assumption and considers the respective effects on the dynamic response of the system of the lubricant type (i.e. Newtonian or non-Newtonian), the bearing housing suspension system (i.e. linear or non-linear), the rotor speed and the degree of rotor unbalance. The behavior of the system is analyzed by reference to bifurcation diagrams, dynamic trajectory diagrams and Poincaré maps, respectively. In general, the results show that the dynamics of the system are significantly dependent on the rotor speed and the degree of rotor unbalance. Furthermore, it is found that the use of a couple-stress fluid lubricant enhances the dynamic stability of the rotor-bearing system considerably compared to that obtained when using a traditional Newtonian lubricant. Finally, the results show that the common assumption of a linear journal housing suspension system results in a significant underestimation of the vibrational amplitudes of both the rotor and the bearing and should therefore be replaced by a non-linear assumption. 相似文献
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On the vibration of rotor-bearing system with squeeze film damper in an energy storage flywheel 总被引:1,自引:0,他引:1
The permanent magnetic bearing and the small-sized hydrodynamic spiral groove bearing are utilized as supports for the rotor of the energy storage flywheel system. The hydrodynamic bearing and the squeeze film damper do not need the oil cycle to remove the heat caused by friction because the friction loss is small. The linear dynamics model with four degrees of freedom is built to describe the vibration of the flywheel rotor-bearing system. The squeeze film dampers show good behavior in suppressing the vibration and improving the stability of the rotor-bearing system. The analytical solution of the dynamic characteristic coefficients of the squeeze film is achieved from Reynolds equation after some simplifications are taken. The numerical computation shows that the moment unbalance excites larger vibration of the rotor than the force unbalance. The upper damper plays an important role in helping the rotor pass its critical speed. The damping coefficient of the squeeze film dampers should be selected carefully. The flywheel arrived at the speed of 39,000 rpm and stored the energy of 308 Wh in the experiment. The calculated unbalance response is compared to the test response of the rotor storing quantities of kinetic energy. The comparison indicates that the dynamics model of the rotor-bearing-damper system is appropriate. 相似文献
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The present work studies fluid forces in a squeeze film damper with a circumferential feeding groove. The groove is taken as a special damper to analyse fluid forces. The dynamic performance of the squeeze film damper is attributed to the special damper, two film lands, and their interactions. From this viewpoint, dynamic effects in the groove are studied based on linearized Navier-Stokes equations to consider effects of variations of fluid velocity and pressure in the groove on forces in the damper. Investigations on film lands are conducted by using a simplified Navier-Stokes equation to include fluid inertia. Then, the two part analyses are combined together by studying the interactions of the flow and the pressure between the groove and film lands from the continuity condition and a Navier-Strokes equation, resulting in new models for force predictions. The new models are compared with experimental results and published work. Comparisons show the new models give better predictions and correlation with experimental data than traditional theory. The new models give a significant improvement on results obtained by traditional theory, especially for tangential force. Based on the new models, the effects of the groove on fluid forces are studied. 相似文献
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The influence on coupling vibrations among shaft-torsion, disk-transverse and blade-bending of a rotor system with a mistuned blade length was investigated analytically. The shaft–disk–blades system appeared to have four types of coupling vibrations, shaft–blade (SB), shaft-disk-blade (SDB), disk–blade (DB), and blade–blade (BB) mode. The natural frequencies in a mistuned blade were not only found changed but also the types of coupling modes. First, the DB modes in a tuned system disappeared and instead they are replaced by SDB modes. Second, the disk experienced mode localization due to the mistuned blade. The results also showed that every mode's frequency varied with the mistuned error linearly in one direction, either positive or negative, but not in both directions. At last, the effects of rotation on the changes of the rotor's natural frequencies were illustrated. Frequency loci showed merging phenomenon with an increase in the rotational speed. 相似文献
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