The geometric error motions of rotary stages greatly affect the accuracy constructed machines such as machine tools, measuring instruments, and robots. In this paper, an embedded sensor system for real-time measurement two radial three angular a stage is proposed, which makes use encoder with multiple scanning heads to measure rotational angle miniature autocollimator tilt errors axis rotation. assembly grid disc mirror are also evaluated compensated. developed device can be fixed inside...

The machine vision measurement module is indispensable for the Modularized Flexible Precision Assembly Station (MFPAS), which a fully automatic assembly system being developed at Dalian University of Technology (DUT). MFPAS consists basic and additional modules, are expected to be flexible, expandable, re-configurable adapt variety parts with large size range, requiring able achieve accurate position, as well orientation different scale. An zooming was set up evaluation final integration in...

2D rotary stages are used in much manufacturing equipment. Besides the inherent geometric errors each axis, position and orientation between two axes also important position-independent errors. Considering that existing methods for testing complex, a simple method is proposed. A laser diode assembled on end of stage's transit sensitive device to test trajectories spots when axis rotates. Then, standing rotates 180 degrees axis's other end. The same experiment repeated, separated by comparing...

A harmonic reducer (HR) is widely used because of high precision, small size, light weight and a series advantages. However, the disadvantage that its transmission ratio generally not less than 60. According to market research study, more 60% reducers have This implies large restricts HR from applications in demanding (20–60). In this method presented for designing with as low 20. First, by clarifying principle reducing HR, design model two-wave tooth profile deduced detail, four-tooth...

为了实现微小磁性零件装配设备的精密装配任务,弥补加工误差和安装误差带来的系统精度损失,提出了一套自动标定及误差补偿方法。依照设备布置形式建立了不同模块的坐标系,提取影响装配精度的全部误差参数。根据导轨的位置关系建立了模块之间的运动转换模型,进而推导出基于装配任务的误差补偿模型。以设备中的机器视觉系统作为测量工具,同时设计专用标定板。通过观察各模块运动前后特征点的坐标变化对误差参数进行测量和辨识,并使用粒子群算法对参数进行了全局优化。基于开发的自动标定软件,在装配区域进行了标定和验证实验。实验结果表明,补偿后的系统开环控制精度在6 μm以内,满足设备的装配精度需求。该方法为微小零件装配设备提供了自动化、高精度和高效率的标定方案。

Position and orientation (PO) estimation with microscopic vision is essential for various micromanipulation tasks. Herein, to improve the accuracy flexibility of PO estimation, a generic algorithm proposed based on Discriminative Correlation Filter (DCF), in which position-estimator an orientation-estimator are combined into one framework developed mutual correction mechanism. The extraction spectral features utilized decouple rotation translation transformations target. And DCF employed...

Abstract Calibration of the micro force sensors is necessary for measurement microNewton forces, which are critical to analytical applications sensor in analysis micromanipulators, microrobots and microgrippers. This paper proposes a novel calibration system calibrate PZT thin film using bimorph probe as loading part. Sensitivities were calibrated by composed drive testing system. The combines 3-dimensional positioning stage, frequency synthesizer, an electronic balance static state or...

Background: In most of the deep-cavity shell plastic products injection moulds, such as test tubes, syringes, and other medical devices, slender core structure is essential. The uneven pressure polymer melt acting on during filling process easily causes deformation, resulting in shift, wall thickness inequality parts, a series problems, which then affect final shape mechanical properties parts. type deep cavity component prone to shift defects molding, syringe sleeve inability achieve...

Due to the narrow working space and small dimensions of bolted shafts, assembly miniature joint in gimbal is highly dependent on human experience skills, consistency cannot be guaranteed. In this paper, a precision system for developed, which including computer control human-computer interaction unit, 3-DOF shaft picking frame 2-DOF tightening unit fixture feeding etc. After prototype automated was built, several sets gimbals were selected experiments. The results show that it takes about 25...

Kinematic error is an important indicator for evaluating the performance of harmonic drive gears. Previous methods calculating kinematic only considered a single meshing tooth, effect other teeth was compensated by homogenization coefficient. Because complex contact state gears, results these are always inconsistent with experimental results. This paper proposes mathematical model considering all to predict pure First, points on each tooth determined, and states flexspline circular spline...

Reducing the flexspline (FS) deformation is important for decreasing alternating stress, flare angle in axial direction, spatial of teeth, and tube length. However, it may increase probability insufficient engagement depth nonexistent conjugate tooth profiles. In this study, a mathematical model harmonic drive (HD) with new profile proposed to reduce FS while satisfying existence conjugated profile. First, generation mechanism discussed detail connection method circular arc transition were...

Piezoelectric transducer wafers are usually used in pairs to adjust the resonant cavity length of ring laser gyro. In practice, paired required have similar piezoelectric charge coefficient d31. To handle pairing operation in-batch, an automatic sorting system was developed on basis deformation measurement, which adopted a frame Cartesian-coordinate robot. The were self-aligned vertical direction, and vacuum holder pick up, transfer, then place them thee testing desk one by one. excitation...

The vibration signal of rolling bearing is complex and nonstationary.In the process fault diagnosis, if only describe single fractal characteristics signal, some certain conditions can't be identified accurately.Therefore, this paper uses multi-fractal dimension as characteristic quantity, puts forward a method based on lifting wavelet transform for diagnosis.The step diagnosis goes follows: firstly, decompose into three layers reconstruct it by transform, to highlight state signal;...

By converting the alignment issue of multiple span rotary shafts into a non-connected shaft issue, we present precision strategy for shafts, and laser-based method measuring misalignment is proposed. The quadrant photodiode detector was calibrated at different rotation angles to obtain sensitivity coefficient. According calibration results, experiment scheme optimized. Then measurement experiments were carried out error source, uncertainty results analyzed. Finally, also measured by...

Laser tracker instruments are used wildly in the measurement of spatial position, but have complicated structure and high manufacture cost. In this paper, a kind 3D laser ball bar instrument for measuring position was introduced, which principle is passive tracking method. Based on analysis error sources, compensation model established according to multi-body system modelling Then, series calibration methods errors proposed, such as angular two rotary stages, transit tilt axis tilt....

Reference level involute is used for evaluating other involutes, but it very difficult to measure reference exactly. Nowadays the available methods measuring precise include single base disc mode, electronic generation and CNC three-coordinate mode. But measurement accuracy of modes above not suitable involute. A instrument involute, double discs instrument, introduced. It consistent with principle entirely. Besides having advantages basic can remove Abbe error caused by stylus, has no...

The rolling bearing is one of the most important and widely used parts in rotating machinery. It necessary to establish a reliable condition monitoring program which can avoid serious fault runtime diagnose failure timely accurately when it happens. This paper puts forward diagnosis method based on PSO-SVM mixed-feature. Firstly, we extract features time domain, frequency order quenfrency domain. Secondly, select both Support Vector Machine (SVM) parameters by Particle Swarm Optimization...

Tiny interference components are widely used in aerospace and instrumentation other fields. The contact stress distribution is the key to evaluating quality of joints, such as joint force, wear, fatigue. In this study, ultrasonic waves were measure on mating surface components. acoustic model optimized based statistical microcontact theory virtual thin-layer theory. reflection coefficient-contact stiffness mapping relationship obtained by model. stiffness-contact with help calibration...

Various micromanipulations require the assessment of target's position and orientation (PO) under microscopic vision. Here a universal method based on multi-feature fusion discrimination correlation filtering (DCF) is suggested to improve accuracy PO estimation. A continuous convolution operator first introduced achieve sub-pixel localization for high-precision location Then, by decoupling translation rotation with Fourier-Mellin transformation, information expressed using features...