Purpose This paper aims to propose a hand–eye calibration method of arc welding robot and laser vision sensor by using semidefinite programming (SDP). Design/methodology/approach The conversion relationship between the pixel coordinate system plane is established on basis mathematical model three-dimensional measurement sensor. In addition, also model. ordinary least square (OLS) used calculate rotation matrix, SDP identify direction vectors matrix ensure their orthogonality. Findings...

Abstract Accurate locating of the weld seam under strong noise is biggest challenge for automated welding. In this paper, we construct a robust detector on framework deep learning object detection algorithm. The representative algorithm, single shot multibox (SSD), studied to establish framework. improved SSD applied detection. Under framework, combined with characteristics task, multifeature combination network (MFCN) proposed. comprehensively utilizes local information and global carried...

To design a stable laser vision seam-tracking system, an advanced weld image processing algorithm based on Siamese networks is investigated and proposed to resist the interference of arc spatter in welding process. This specially designed neural network, combined with powerful feature expression capabilities deep learning, takes two images different sizes as inputs generates target confidence map single forward pass by using cross-correlation algorithm. prevent error accumulation model...

Purpose This paper aims to propose a set of six-axis robot arm welding seam tracking experiment platform based on Halcon machine vision library resolve the curve issue. Design/methodology/approach Robot-based and image coordinate systems are converted mathematical model three-dimensional measurement structured light conversion relations between robot-based camera systems. An object algorithm via weighted local cosine similarity is adopted detect feature points prevent effectively...

Miniaturization is particularly important for satellite systems. The bandpass filter has achieved high performance on the basis of miniaturization by LTCC technology. To achieve performance, adding transmission zeros to improve stopband rejection considered. This created new structure series parallel resonant units. Using circuit simulation and 3D software optimize simulate, measured results match well with electromagnetic simulation, center frequency 140MHz,its bandwidth 60 MHz, at 200MHz...

The location and perception systems are important component of indoor mobile robots, research on their failure mode effect can provide guidance for improving the performance robots. In order to solve problem that weight distribution risk factors in traditional analysis (FMEA) is difficult evaluation results greatly affected by subjectivity, an improved FMEA method robot based interval triangular fuzzy number proposed. Firstly, expert weights allocated multi standard method, then determined...

The costs from the servicing of warranty depend on reliability product, maintenance actions, and strategy. In this paper, we focus a repair strategy based minimal imperfect repairs for two-dimensional warranty. We consider rectangular region with two measures (age usage) divide it into three disjoint sub-regions. failed item is rectified by when fails first time in second sub-region while all other failures are repaired minimally. derive optimal values these to minimize total expected cost....

The cost from the servicing of warranty depends on reliability product, maintenance actions, and strategy. In this paper, we focus a repair strategy based imperfect for two-dimensional (2D) warranty. We consider rectangular region with two measures (age usage) divide it into three disjoint sub-regions. Only first failure in second interval is rectified by while all other failures are repaired minimally. modeled 2D product strategy, then used two-stage process to minimize total expected cost....