共查询到20条相似文献,搜索用时 108 毫秒
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由于转子永磁体和定子铁芯之间存在极强的电磁吸力,当转子旋转时会引起电机定子的机械振动。现对不同转子结构的永磁同步电机的电磁振动问题进行分析比较,包括表面式、内置式转子结构,其中内置式转子结构又分径向式和切向式转子结构。首先分析了永磁电机内部的电磁力分布,通过二维电磁场的分析计算,可以得到在不同转子位置时电机内部的电磁力分布。将电磁力耦合到电机的瞬态结构有限元模型中,可以计算得到永磁同步电机的振动特性。 相似文献
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结合工程实例,采用有限元方法建立了框架式压缩机基础的计算模型,并对其进行了模态分析和谐响应分析.基于数值分析表明:基础存在绕机组转轴的回转振动,且水平与竖向振动耦合比较明显,其影响不能忽略.梁柱节点区域加腋可以提高结构刚度,高转速时对振动效应影响不明显. 相似文献
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Coherence technique for noise reduction in rotary compressor 总被引:1,自引:0,他引:1
H. C. Kim M. G. Cho J. Kim J. H. Park J. Shim 《Journal of Mechanical Science and Technology》2012,26(7):2073-2076
The noise and vibration of a rotary compressor, a type of multi-input, single output system, are generally studied through frequency analysis. Although this method is effective in analyzing frequency components, using this method to identify the specific source of the noise (4 kHz to 6 kHz) is difficult. Hence, noise source should be studied systematically. In this study, a coherence analysis method based on systems analysis is used to identify the compressor noise source. Compressor noise source is identified through the coherence between the vibration signals on the shell of the compressor and the noise signal at one point near the compressor (1 m away from the compressor). A one-third octave band is employed for frequency analysis. The design of experiment is conducted to identify possible noise factors, such as volume, size, and neck area of the resonator in the compressor cylinder. Analysis showed that noise was generated from the cavity of the cylinder and the muffler inside the rotary compressor. A new type of muffler was applied to the rotary compressor to verify this finding. Noise was dramatically reduced. 相似文献
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BX32-20/2T2-100/8型往复式压缩机振动分析 总被引:1,自引:0,他引:1
针对BX32往复式压缩机投用以来一直存在振动过大、运行不稳定等问题,对其进行了改造。通过对BX32往复式压缩机结构进行理论和有限元的振动分析,得出了支承杆共振是引起缓冲罐焊缝断裂、机器振动的主要原因。对压缩机的支承进行了重新设计,通过实施得到了满意的工业应用效果。 相似文献
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Time-dependent vibration frequency reliability analysis of blade vibration of compressor wheel of turbocharger for vehicle application 总被引:1,自引:0,他引:1
Blade vibration failure is one of the main failure modes of compressor wheel of turbocharger for vehicle application. The existing models for evaluating the reliability of blade vibration of compressor wheel are static, and can not reflect the relationship between the reliability of compressor wheel with blade vibration failure mode and the life parameter. For the blade vibration failure mode of compressor wheel of turbocharger, the reliability evaluation method is studied. Taking a compressor wheel of turbocharger for vehicle application as an example, the blade vibration characteristics and how they change with the operating parameters of turbocharger are analyzed. The failure criterion for blade vibration mode of compressor wheel is built with the Campbell diagram, and taking the effect of the dispersity of blade natural vibration frequency and randomness of turbocharger operating speed into account, time-dependent reliability models of compressor wheel with blade vibration failure mode are derived, which embody the parameters of blade natural vibration frequency, turbocharger operating speed, the blade number of compressor wheel, life index and minimum number of resonance, etc. Finally, the rule governing the reliability and failure rate of compressor wheel and the method for determining the reliable life of compressor with blade vibration is presented. A method is proposed to evaluate the reliability of compressor wheel with blade vibration failure mode time-dependently. 相似文献
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研究了离心压缩机机壳在内部基频气动力激励下的振动辐射噪声。考虑机壳与轮盘、轮盖之间的间隙,采用SSTk-co湍流模型模拟了离心压缩机的整机三维非定常流场,得到蜗壳内表面的脉动压力,然后将脉动压力的基频部分加载到蜗壳上,模拟离心压缩机蜗壳在非定常气动力激励下的振动噪声。研究表明:机壳内壁面基频压力脉动主要分布在无叶扩压器靠近叶轮出口一侧;机壳主要基频振动噪声源位于蜗壳靠近出口管道一侧;该离心压缩机机壳基频振动位移幅值很小,最大振动位移仅为11.8×10^-9m,因此可以忽略机壳的基频振动对离心压缩机运行安全性的影响。 相似文献