In gear measuring machines (GMMs), the tested is mounted on a mandrel, which pivoted at both ends by two centers in vertical arrangement. The upper center fixed and lower driven spindle of rotation. coaxiality error between central line mandrel average GMM always exists terms offset angle measured one plane. Such would cause an angular indexing resulting measurement error. This phenomenon has rarely been investigated. this paper, taken as example its rotary stage are measured. difference...

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...

Mechanical failure is primarily caused by coaxiality errors of axis. Traditional methods (synthetic gauge testing methods, method rotary axis, coordinate measuring machine, etc.) for detecting have some disadvantages such as: low efficiency, sensitive to human factors and cannot be used measure the axis that far apart without connection. In this paper, based on principle laser collimation, a non-connecting with long distance was proposed. By rotating module four-quadrant photo detector...

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...

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...

The functional information model of the technical system based on component unit is basis analysis computer aided function.Through introduction graph theory knowledge, establishing function directed graph's adjacency matrix and reachable matrix.The establishment multilevel advanced graphs can directly determine technology internal parallel chain.Using ENV to analyze causal relationship between adverse effects in chain, find key effect solve problem.

Technology forecasting is helpful for enterprises to achieve innovation at a high rate of speed.Forecasting technology maturity and evolution potential products, developing proper strategies locking development direction in the future are important contents forecasting.This paper uses TRIZ method researches relevant patent information analysis process cotton picker technology.By comparing fitting curve standard drawing evolutionary radar map, we forecast picker.The conclusion proved that...

Recently rumors have been rapidly propagated while the Internet has extensively developed. Research shows that highly credible comments with a distinct stance worthy information. In this paper, we attempt to combine user credibility and capture during information-dissemination process detect rumors. We propose User Stance Bi-Directional Graph Attention Networks (USBGAT) model extract accurate information for rumor detection based on high users strong stance, diminish ineffectively neutral...

Abstract Harmonic-drive transmission finds many applications in industry, especially manufacturing of industrial robots. As the key devices an robot, harmonic drive reducers determine robot’s performance, which includes positioning accuracy, loading capacity, life time, etc. To satisfy need high performance devices, development competent measurement system is great importance. An automatic with high-precision and multifunction under development. The consists power module, torque rotation...