共查询到19条相似文献,搜索用时 125 毫秒
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针对某精密行星齿轮减速器的振动噪声问题,通过Romax Designer软件建立刚柔耦合动力学模型;并对减速器箱体进行模态分析,提取箱体的前六阶约束模态振型和固有频率,确定产生噪声的共振频率点;同时分析了齿轮传动误差、齿轮时变啮合刚度等激励的特性。提出通过齿轮修形降低减速器内部动态激励进而减小振动和噪声的方法,并使用LMS Virtual.lab软件对减速器进行声学响应求解。仿真结果表明,优化后减速器的振动和噪声明显降低;最后搭建了行星齿轮减速器试验台,实测噪声与仿真结果基本吻合,验证了该方法的合理性。 相似文献
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针对RV减速器运转过程中产生的噪声问题,对渐开线齿轮和摆线齿轮进行齿面修形,基于经验修形公式得到其修形量,建立正交试验表,以RV110E型减速器为研究对象,基于RecurDyn软件得到减速器在不同修形下的噪声值。结果显示,对于渐开线齿轮修形,RV减速器的降噪效果显著,最大噪声值减小了7.78 dB(A)。利用Romax软件建立RV110E型减速器虚拟样机,导入渐开线齿轮修形参数,对比修形前后的仿真结果可知,组合修形后的渐开线齿轮传动误差减小,齿面单位长度载荷峰值减小,齿面偏载问题和噪声均得到改善,有效提高了减速器的传动平稳性。研究结果对不同型号的RV减速器齿轮修形有一定的借鉴意义。 相似文献
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本文以某单电机电驱系统减速器为研究对象,针对整车NVH试验评价中减速器啸叫问题进行专项分析和优化,通过建立精确的减速器总成动力学性能分析虚拟样机模型,对齿轮啮合振动激励机理、传动路径和振动响应等进行详细分析,根据台架试验和整车试验结果标定虚拟样机模型,通过齿轮宏观参数及微观修形优化对齿轮加工误差、传递误差、啮合刚度和动态啮合力进行专项优化和控制;同时通过对零部件及系统的模态及振动响应分析,分析传递路径及系统响应结果,预测振动噪声风险,通过传递路径刚度及激励频率优化,降低系统振动响应和噪声风险;最后通过整车NVH性能试验验证改进效果.通过以上手段,显著降低了减速器的啸叫噪声,最终达成整车NVH性能要求. 相似文献
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用光学显微干涉法进行表面形貌测量时其深度测量范围的扩大和形貌测量精度的提高是一对矛盾。为此,本文设计出了一种基于波长轮换与相移扫描相结合的三波长表面形貌测量系统,并提出了一种基于椭圆拟合与相位差大小尺度相结合的相位提取与识别算法。将这种算法运用于多波长干涉图像的数据处理,有效地提高了形貌的整体测量精度,并拓展了深度测量范围。实验结果表明:在深度测量范围扩大近15倍的条件下,采用粗糙度国家基准校准的方波多刻线样板得到的表面粗糙度数据与校准数据的相对误差仅为4.12%,表明该系统在一定的深度范围内能够实现表面形貌的高精度测量。另外,针对该系统设计的多波长相位识别算法对环境噪声要求不高,可以支持系统的高噪声或在线测量。 相似文献
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Integration Planning Model of IDEF0 and STEP Product Data Representation Methods in a CMM Measuring System 总被引:1,自引:1,他引:0
Z.-C. Lin J.-J. Chow 《The International Journal of Advanced Manufacturing Technology》2001,17(1):39-53
The measuring process using a CMM involves a large amount of data. It is necessary to understand and clearly define the data
required by the measuring process and the relationships of these data before incorporating automation into a CMM system. This
paper uses the IDEF0 model to analyse the measuring function requirements for solving the problem of ambiguous internal information
flow and material flow during the measuring process. A data module for the CMM measuring system was developed using the EXPRESS
language in STEP, to support the IDEF0 function process module. An information flow design model was also established, which
integrated the IDEF0 process requirement analysis model and the EXPRESS data module. The objective is to enhance the efficiency
of the development of measuring systems by system designers, and to provide a basis for future development of measuring information
systems using STEP data formats. 相似文献
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本文构建了一套基于虚拟锁相放大技术的、能准确测量微弱信号的高精度宽波段原位光学测量系统。介绍了该测量系统的建立目的,系统结构及原理;阐述了如何通过美国Ni公司的图形化编程语言Labview来虚拟实现锁相放大器功能,并应用于本套测量系统。这样既降低了成本,又简化了系统结构。测量了系统光源在200-2500nm的光强分布,测量了系统紫外可见部分及红外部分测量重复性,分别能达到0.12%、0.54%。最后利用该套系统测量了一块石英玻璃的透过率,并与lambda950的测量结果比较,两者测量结果平均相差0.95%。实验结果表明,使用了虚拟技术来实现锁相放大处理的该套原位光学测量系统的测量精度较高,对杂光和电气设备带来的噪声的抑制能力较强,能有效得对样品进行原位光学性能测量。 相似文献
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基于DSP的汽车转速及噪音测量仪设计 总被引:4,自引:1,他引:4
结合单片机AT89C51并采用浮点DSP芯片TMS320VC33技术,开发了一种既能测量汽车噪音又能实时给出汽车转速的新型测量仪器,其中DSP主要用于数据的计算而单片机用于人机接口和管理。文中主要介绍了仪器的硬件设计和总体软件策略。 相似文献
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一种用于空间辐射测量的信号检测方法 总被引:2,自引:0,他引:2
针对空间辐射测量中的被测信号常常受到系统噪声、漂移及背景辐射的影响,讨论了一种用于空间辐射测量的信号检测方法---数字同步累加解调法。实现了测量系统对背景噪声的实时扣除,使系统的测量灵敏度约提高了一个量级。介绍了实现该方法的电子学系统构成及系统设计中要注意的关键环节。最后将该方法的测量结果与采用常规方法测量所得的结果进行了比较,证明该方法对背景噪声扣除了近80%且对小信号测量的效果较佳。 相似文献
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Eun-Goo Kang Sung-Jun Park Sang-Jo Lee 《The International Journal of Advanced Manufacturing Technology》2005,25(7-8):647-651
The measurement of cutting force is one of the most frequently used techniques for monitoring machining processes. Its widespread application ranges from tool condition identification, feedback control and cutting system design to process optimization.This paper suggests another system for measuring cutting force in milling processes. Generally, tool dynamometers are taken into account for the most appropriate cutting force measuring tool in the analysis of a cutting mechanism. However, high prices and limited working space make in situ systems difficult for a controllable milling process. Although an alternative suggestion is to use an AC current from a servomotor, it is unsuitable for cutting force monitoring because of a small upper frequency limit and noise.The suggested cutting force measuring system is composed of two piezo load cells placed between the moving table bracket and the nut flange of the ball screw. It has many advantages, such as lower cost and a wider measurement range than the tool dynamometer, over using the built-in feeding system and the low-cost piezo load cell for applying a conventional machining center.This paper focuses on the performance test of a newly developed measuring system. By comparing the cutting force between the tool dynamometer and the system developed from a series of end milling experiments, the accuracy of the cutting force measurement system was verified. Linearity, transverse sensitivity and the upper frequency limit of the system were verified by experiment. 相似文献
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为了快速评价工业线阵CCD相机质量,本文选择信噪比为评价因子,建立了测试系统,研究了基于相机输出图像测试相机噪声的方法。分析了线阵CCD相机的噪声,建立了一个基于固定模式和随机噪声的信噪比计算模型,并分析了相关双采样(CDS)过程对电源噪声的影响。设计了一套适于工业场所的相机快速信噪比测试系统,结合理论分析数据和实际测试图像数据,提出了仅通过输出的8bit图片计算各噪声参数的方案。最后,对测试系统引入的光源不均匀性噪声进行了讨论,并证明该实验平台光源符合工业标准EVM1288要求。实验结果表明:当相机模数(AD)转化设置为8.7dB时,输出信噪比可达44dB;若排除光源干扰,输出信噪比可达46dB。该方案简便快捷,满足工业现场对相机信噪比评估的要求。 相似文献
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A microprocessor-based system for measuring low-frequency (less than 100 Hz) electrical noise power spectra is described. The main function of the microprocessor was to determine the noise autocorrelation function using simple 'one bit' autocorrelation arithmetic, subsequent Fourier transformation to find the power spectra being done on a larger computer. Given that such larger computing facilities already exist, this system is much less expensive than more conventional analogue techniques. We illustrate the way in which this system was implemented to measure current noise in insulating polymers. 相似文献