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针对转子多维动态信号测量需要在多个位置采用不同种类的传感器进行分布测量以及难以通过单一传感器实现转子多动态参数同步测量等问题,提出一种基于面阵相机的转轴多维动态参数的视觉同步测量方法。首先,系统地描述了基于转轴端面标靶图案的三维振动位移和转速视觉测量原理,建立了转轴真实动态参数和标靶图案动态参数之间的内在联系。其次,推导了转轴振动三维位移和转速测量公式,联合转轴三维运动仿真模型验证了转轴动态参数的测量原理和算法正确性,通过仿真模型分析了影响系统测量精度的因素。最后,通过搭建转子测试平台,将视觉系统测得的转轴三维振动位移和转速分别与电涡流位移传感器和编码器的测量结果进行对比,验证了转轴多维动态参数端面视觉测量方法的有效性和可靠性。 相似文献
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基于89C51的计算机可锁定加密键盘设计 总被引:1,自引:0,他引:1
介绍PC键盘和键盘接口的PS/2通信协议,以及用89C51实现可锁定键盘的软件和硬件设计方法。具有安全可靠、容错能力强、可以直接采用标准键盘进行改装、便于实现等优点,并保留标准键盘的全部功能。 相似文献
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介绍一种基于IAP15W4K58S4单片机的巡检智能车软硬件设计方案,为增强巡检智能车的灵活性,采用麦克纳姆轮实现全向移动功能,并提供蓝牙遥控、PS/2手柄遥控及摄像头图像传输等功能。该巡检智能车采用模块化设计,主要包括多路电源电路模块、双路电机驱动模块、单片机主控电路模块、蓝牙遥控功能模块、PS/2手柄遥控功能模块、摄像头驱动模块及手机端的App程序,可通过单片机输出的PWM信号控制电机转速,并可通过旋转编码器进行测速。该巡检智能车系统成本低、灵活性高、运行稳定可靠。 相似文献
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MPEG-2是一种应用范围很广的数据压缩标准,而熵编码器是基于MPEG-2标准的视频编码器中的重要组成部分。该文介绍了MPEG-2中有关熵编码的压缩编码原理,并具体讨论了熵编码器的功能及其实现,对熵编码器的各个功能模块,利用MAX+PLUSII软件分别做了详细的结构设计,进行了功能模拟和验证。 相似文献
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考虑到软件老化具有动态性,准确预测软件老化趋势,可降低软件老化所造成的损失,提出基于动态命令树算法的软件老化趋势预测方法.采用基于降噪自编码器与混合趋势粒子滤波的软件老化趋势预测方法,通过软件未老化特征训练降噪自编码器,把软件老化特征数据输入训练完毕的降噪自编码器中获取重构误差,对重构误差进行平滑处理后,设成观测值输入混合趋势粒子滤波算法,实施软件老化趋势预测.在预测阶段,使用基于动态命令树算法的软件老化趋势预测命令管理方法,实现软件老化趋势预测指令的动态管理,优化软件老化趋势的动态预测效果.实验结果表明,所提方法可提升软件老化趋势预测的精度,预测效果显著. 相似文献
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用光电编码器测量某钻机上车体转角时,其输出信号曾产生附加脉冲,从而导致测量误差.通过对编码器的安装连接方式及使用状况分析,发现这是由于编码器转轴与对接圆孔之间有间隙,且编码器转轴偏心安装所致.给出了消除误差的解决方案. 相似文献
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基于Java及PS/2协议的数控仿真平台 总被引:1,自引:0,他引:1
数控加工技术是机械类工科大学生必备的专业技能之一,但由于资源的缺乏及安全的考虑,受培训者实际动手操作的机会有限,教学效果不佳.数控仿真很好地解决了上述问题.文中以数控车床为主要研究对象,给出了切削加工的简单运动学模型和力学模型及Java语言的程序实现,取得了具有真实感的仿真效果.同时基于PS/2协议开发了数控车床的仿真面板,并实现仿真程序与仿真面板的连接.开发出跨平台(cross platform)、即插即用(plug and play)具有真实感的数控车床仿真教学平台. 相似文献
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螺旋桨滑流带来的复杂气动力影响目前只能在风洞试验中获得,为了准确测量气动力从而获得螺旋桨滑流的影响量,使用旋转轴天平直接与螺旋桨相连并高速同步旋转进行风洞试验;对旋转轴天平的试验原理、数据处理方法进行了深入研究,设计开发了风洞旋转轴天平信号处理系统;综合考虑了信号衰减、电磁环境等干扰问题,通过时钟背板触发启动采集,保证了信号采集的同步性,系统整体处理精度等指标都满足试验技术要求;还创新性地开发出了风洞动态数据连续测量技术,大幅提高了试验效率;经过多次风洞试验测试,实现了对旋转轴天平信号的调理、采集和处理功能,为高效率、低噪声的先进螺旋桨设计和涡桨飞机气动噪声设计提供了技术支持。 相似文献
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Dukki Chung Francis L. Merat Fred M. Discenzo James S. HarrisAuthor vitae 《Sensors and actuators. A, Physical》1998,70(3):1361-249
Photoelasticity can be used to accurately measure surface strains or stresses in a part or structure. In this paper we describe the use of a photoelastic transducer and neural net image processing to estimate the torque of stationary and rotating shafts. A strain sensitive (photoelastic) plastic cylinder is attached to the shaft and illuminated by polarized light. As the shaft torque varies the photoelastic plastic displays the corresponding shaft strain as a two-dimensional fringe pattern when viewed through an optical polarizer. The strain that causes this observed optical pattern is a complex function of the torque applied to the shaft. In this paper, we describe the use of neural net image processing to estimate this function to realize an optical torque sensor. A CCD camera/image processing system was used to acquire and process the optical patterns. A neural net torque estimator was trained with these fringe patterns and tested against a laboratory strain gauge torque sensor. Our experiments show that the neural net torque estimator can accurately estimate (to within a few percent) the applied torque for both static and slowly rotating (<20 rpm) shafts. 相似文献
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深入浅出地介绍了转轴编码器的工作原理,从硬件连接和软件设计两个方面分别介绍了编码器的接口电路、8279芯片编方式的选择考虑及编码器顺、逆方面旋转时的识别和取值程序。 相似文献
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The system studied in this paper is a rotating disk/spindle assembly supported by hydrodynamic bearings with a rotating shaft
design. Based on an experimentally verified mathematical model [1, 2], this paper presents how various spindle parameters
affect critical vibration modes of the system, such as half-speed whirls and (0, 1) unbalanced modes (i.e., rocking modes).
The parameters studied include number of disks, hub/shaft interface stiffness, shaft rigidity, thrust bearing location, radial
bearing stiffness, radial bearing damping, and radial bearing locations. To simulate operational tests, the numerical study
focuses on frequency response functions (FRF) of rotating disk/spindle systems subjected to linear base excitations. Simulation
results show that 1-disk configuration has smaller FRF amplitude than the 4-disk configuration. In addition, the amplitude
of half-speed whirl is primarily controlled by the radial bearing stiffness. In contrast, the amplitude of (0, 1) unbalanced
modes is dominated by hub/shaft interface stiffness. Finally, radial bearing locations significantly affect the amplitude
of half-speed whirls and (0, 1) unbalanced modes simultaneously.
Received: 16 October 2001/Accepted: 31 December 2001 相似文献
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根据LabVIEW的功能特点,提出了用LabVIEW对数字电路进行仿真教学.本文以74148集成8线-3线优先编码器为例分析了LabVIEW在数字电路教学中的应用,并完成了4线-2线、8线-3线、10线-4线普通编码器和优先编码器的设计,将各个编码器程序集成在一个主程序面板中,用数字显示的方式将结果显示出来.通过仿真验证其结果与实际元器件的功能完全相同,这样既丰富了教学方法和手段,又提高了教学质量,增强了学生学习的兴趣和积极性. 相似文献
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虚拟仪器技术在柴油机故障诊断系统中的应用 总被引:3,自引:2,他引:3
介绍虚拟仪器的基本概念,以及利用此技术组建柴油机故障诊断系统的方法。在可视化编程环境中,实现多功能仪器软面板,并能对数据进行处理、显示和打印等操作。 相似文献
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滚齿切削扭矩测试系统的设计 总被引:1,自引:0,他引:1
本文介绍滚齿切削过程的一种扭矩测试系统,该系统结合电压/频率转换技术和光电耦合,实现了信号的无接触传输,并开发利用8098单片机数据采集技术,为在旋转轴上测量切削力提供了一个切实可行又可靠的方法。 相似文献
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Real-time classification of rotating shaft loading conditions usingartificial neural networks 总被引:1,自引:0,他引:1
Vibration analysis can give an indication of the condition of a rotating shaft highlighting potential faults such as unbalance and rubbing. Faults may however only occur intermittently and consequently to detect these requires continuous monitoring with real time analysis. This paper describes the use of artificial neural networks (ANNs) for classification of condition and compares these with other discriminant analysis methods. Moments calculated from time series are used as input features as they can be quickly computed from the measured data. Orthogonal vibrations are considered as a two-dimensional vector, the magnitude of which can be expressed as time series. Some simple signal processing operations are applied to the data to enhance the differences between signals and comparison is made with frequency domain analysis. 相似文献