共查询到17条相似文献,搜索用时 88 毫秒
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1引言舞台机械过程控制中存在大量的噪声,其直接影响了舞台的控制效果。我们通过比较模拟滤波器与数字滤波器的优缺点,重点分析了数字滤波器的设计原理方法,设计了一种滤波器,应用在舞台机械主从分布群控系统中,取得了较好的控制效果。2噪声分析在舞台机械控制过程... 相似文献
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机械共振是伺服系统中普遍存在的一个问题,机械共振主要由伺服系统中功率传输元件的柔性所引起.伺服系统中标准的控制律是按照刚性耦合的负载来设计的,然而,在实际的伺服系统中柔性普遍存在,这种柔性会减小系统的稳定裕度、降低系统的性能甚至引起系统不稳定.带阻滤波器是处理机械共振的最常用的方法,本文提出了一种伺服系统中带阻滤波器设计的新方法,该方法较老方法具有明显的优点. 相似文献
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柔性环节带来的机械谐振是制约伺服系统性能提升的一个关键问题。通过对伺服系统机械谐振的原理阐述,分析引起伺服系统机械谐振的两种原因。利用加速度反馈的方法可以等效增大电机惯量,从而抑制机械谐振。本文提出一种基于卡尔曼滤波器的惯量比可调负载转矩反馈方法,并通过确定最优惯量比进而计算得到负载转矩反馈系数。基于卡尔曼滤波器设计负载转矩观测器,再将观测到的负载转矩反馈到电流环给定中。通过matlab对观测器及负载转矩反馈抑制机械谐振效果进行仿真验证。 相似文献
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在地质勘探滤波器的设计中,随着电子设备工作频率范围的不断扩大,勘探岩石电位磁场信号受到干扰,干扰源主要的包括高压线输电线、运行的大型机械、车辆等,对信号的干扰的主要表现在50Hz的工频谐波均大脉冲的随机干扰.传统的滤波方式对于50Hz工频及其谐波的干扰一般通过多次时域数据叠加的方式削弱,采用多次运算完成滤波,对芯片的能耗较大,缺陷明显.为提高滤波器性能,提出了系数可重置的带通滤波器设计方法,以保证在低能耗下,减少CSAMT实施中的电磁干扰.通过加窗sine函数完成了带通滤波器系数在FPGA硬件上的计算与生成,实现了滤波器的内核复用,节约了FP-GA的资源消耗,提高了滤波器的灵活性和适用范围.仿真与野外试验结果表明,系数可重置带通滤波器在CSAMT测量方法中可将采集的通带外的电通道噪声抑制在-140dB以下. 相似文献
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首先介绍了时间序列ARMA模型及其建模方法,并利用该方法基于振动环式微机械陀螺的实测数据建立了振动环式微机械陀螺随机漂移的ARMA模型。在此模型基础上,设计了Kalman滤波器。仿真结果表明此方法能够有效抑制微机械陀螺的零点随机漂移。 相似文献
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新型F-P腔滤波器的性能分析及控制 总被引:1,自引:0,他引:1
介绍了一种实用新型法布里珀罗(F-P)腔滤波器的结构设计和工作原理,它以光纤准直器与光学膜片组成F-P腔和以逆压电效应型微位移器进行腔长调谐。分析了F-P腔滤波器的机械特性及其对扫描特性的影响,通过调整输入波形的形式来修正F-P腔滤波器的扫描畸变,从而达到计算机控制F-P腔滤波器扫描的高精度和可控性。F-P腔滤波器的扫描位移可达到1μm以上,扫描频率高于160Hz,自由谱区达50 nm,扫描线性度为1%。 相似文献
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Microelectromechanical system (MEMS) devices exhibit characteristics that make them ideal for use as filters in acoustic signal processing applications. In this study, a MEMS filter is constructed from multiple mechanical structures (e.g. cantilever beams) and a differential amplifier. The outputs of the structures are then processed by the differential amplifier to achieve the filter functionality. The important parameters of the mechanical structures and the MEMS filters are investigated using a simulation approach, including the structural damping factors, the normalized frequency ratios (NFR) of the MEMS filters, the number of mechanical structures required to construct individual MEMS filter, and the spatial arrangement of the multiple mechanical structures relative to the differential amplifier. Furthermore, the mutual coupling effects among these parameters are evaluated by detailed simulations. The simulation results show that a plot of the NFR versus the damping factors can be used to determine the optimal parameters for the mechanical structures. The number of mechanical structures required to construct a MEMS filter must equal 2n, with n as an integer, and these mechanical structures should be arranged as a geometric series with increasing resonant frequencies and with specific connections to the differential amplifier.This material is based (in part) upon work supported by the National Science Council (Taiwan) under Grant NSC 91–2213-E-010-008 and Delta Electronics Foundation. The authors would like to express their appreciation to the NSC Central Regional MEMS Center, Semiconductor Research Center of National Chiao Tung University (Taiwan), and the NSC National Nano Device Laboratories (Taiwan) in providing experimental facilities. 相似文献
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机械过滤过程是海水淡化处理的前端重要环节,对其优化运行研究有助于降低机械过滤成本。本文通过对深层过滤理论的研究,得到在恒流条件下,滤层孔隙率与滤饼压降之间的关系模型。以此为基础建立了以机械过滤器清洗周期为应变量,以机械过滤器年周期运行费用为目标函数的关系模型,通过仿真优化,得到机械过滤器的最佳清洗周期。且对机械过滤器在一个清洗周期内,孔隙率、滤饼压降等参数的变化情况作了探讨。研究表明,在恒流条件下,当孔隙率大于0.5之前,滤饼压降随着孔隙率的减小而缓慢增加,尤其在孔隙率为0.6~0.8之间,滤饼压降增加非常缓慢,在孔隙率小于0.5之后,随着孔隙率的减小,滤饼压降快速增加;通过对最佳清洗周期模型的分析,最佳清洗周期不受机械过滤器每年运行时间的影响,但受到停机清洗费用的影响较大,它随着每次清洗费用的增加而增加;在每次清洗费用不变的情况下,随着年运行时间的增加,年节约费用不断增大;在年运行时间不变的情况下,随着每次清洗费用的降低,年节约费用也在不断增加。 相似文献
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Matthias Firl Roland Wüchner Kai-Uwe Bletzinger 《Structural and Multidisciplinary Optimization》2013,47(4):507-521
This paper introduces a general fully stabilized mesh based shape optimization strategy, which allows for shape optimization of mechanical problems on FE-based parametrization. The well-known mesh dependent results are avoided by application of filter methods and mesh regularization strategies. Filter methods are successfully applied to SIMP (Solid Isotropic Material with Penalization) based topology optimization for many years. The filter method presented here uses a specific formulation that is based on convolution integrals. It is shown that the filter methods ensure mesh independency of the optimal designs. Furthermore they provide an easy and robust tool to explore the whole design space with respect to optimal designs with similar mechanical properties. A successful application of optimization strategies with FE-based parametrization requires the combination of filter methods with mesh regularization strategies. The latter ones ensure reliable results of the finite element solutions that are crucial for the sensitivity analysis. This presentation introduces a new mesh regularization strategy that is based on the Updated Reference Strategy (URS). It is shown that the methods formulated on this mechanical basis result in fast and robust mesh regularization methods. The resulting grids show a minimum mesh distortion even for large movements of the mesh boundary. The performance of the proposed regularization methods is demonstrated by several illustrative examples. 相似文献