Mid-spatial frequency (MSF) errors are always produced in magnetorheological jet polishing (MJP) with a simple vertical jetting model and require control during the process. The relation between surface MSF power spectral density is analyzed. Based on this, various concepts methods developed to restrain MJP. With cut-off frequency, appropriate removal function adopted. In addition, dedicated path uniform characteristics designed for polishing. weighted iterative algorithm proposed get...

Path effect on a polished surface always matches tool motions and manifests as mid-spatial frequency (MSF) errors in magnetorheological jet polishing processing. To control the path effect, extended methods part-constrained paths are presented this paper. The methods, Zernike extension Neighbor-Gerchberg extension, developed for building an with weak edge simulation. Under constraint of pitch principle, unicursal is to enhance randomness path, including turns dwell-point positions....

This paper aims to create a high-quality surface based on the linear contact material removal mechanism. For this paper, piezo-driven, flexure-based micro-motion stage was developed for vibration-assisted roll-type precision polishing system. Meanwhile, compliance matrix method employed establish amplification ratio and model of flexure The dimensions mechanism were optimized using grey wolves optimization (GWO) algorithm, aiming maximize natural frequencies. Using optimal parameters,...

Laser-induced damage threshold (LIDT) is a key parameter for optical components heavily influenced by the surface roughness in high-power laser uses. Present polishing technologies often bring about directional micro waviness to surfaces due path effect. Roughness features of K9 glass were studied this paper. A new evaluating restriction power spectral density specification was established, and off-specification frequency contents found out. Then electromagnetic simulation light field...

We propose a novel algorithm for efficient and robust pose determination of vehicles in traffic scenes from single monocular intensity images using calibrated cameras. consider the process as series evolutions initial to correct 3D space, which can be decomposed into two independent motions: translation rotation. The parameters are obtained based on point-to-line-segment distance (PLS distance), while rotation determined by geometric relationships among set specially constructed but...

To meet the special demands in small-scale discontinuous optical surface fabrication, integrated magnetorheological jet polishing (IMJP) tool with multiple motion degrees is introduced this paper. Four jetting models are implemented and investigated by means of IMJP for practical manufacture. ensure steady a long distance, ideal distribution characteristics magnetic field structure proposed, based on electromagnetic theory. The simulated subsequently using finite element analysis method,...

Subaperture polishing techniques usually produce rolled edges due to edge effect. The edges, especially those in millimeter scale on small components, are difficult eliminate using conventional methods. Magnetorheological jet (MJP) offers the possibility of removal these structures, owing its tool influence function (TIF) size. Hence, we investigate characters inclined MJP jetting models by means computational fluid dynamics (CFD) simulations and experiments. A discrete phase model (DPM) is...

The center line of the structured light stripe extraction is key step in process laser measurement structure. In process, a new method based on adaptive orientation template proposed to extract subpixel optical for influence quality source and inconsistent width image object surface. This algorithm firstly determines fringe region calculates each section by contour detection. Then use skeleton thinning obtain coarse gravity stripes. According cross stripe, generate direction corresponding...

A novel shape reconstruction method based on zero-curl gradient field estimation is presented in this paper. Zero-curl makes the most of curl information to obtain ideal data, and achieves with quality map path integration method. In process, an algebraic approach adopted enforce integrability, which maintains local well. Moreover, we use residual gradients surface obtained from Southwell zonal algorithm as raw data estimation, has a stable tradeoff between smoothness confinement. The...

Researchers occasionally use a single photomask to create stacked structure with identical patterns. This method is cost-effective but also challenging for precise overlay control, due the lack of coupled marks between successive layers. In this paper, an innovative approach has been developed address problem. By shifting exposure field specific offset, outer mark previous layer and inner current are aligned same coordinate position, allowing accurate measurement error. The raw values then...

This paper has analyzed the intelligent parking system algorithm based on camera calibration model. The model been established, initial image collection is acquired by generation module, im

Abstract In view of the defects total station and laser tracker in construction three-dimensional control network, a method network is proposed by combining tracker. Total stations trackers are utilized separately to observe points according free-stationing method. data processing, weights different types observations reasonably determined based on Helmert variance component estimation. The high-precision horizontal direction station, which better than <m:math...

The objective of this paper is to study the cutting forces in hard turning T250 steel with CBN tools. Experiments based on Box-Behnken design were conducted develop models by response surface methodology (RSM). Significance tests model are performed analysis variance (ANOVA). It also discussed effects parameters (cutting speed, feed rate and depth cut) force components. results show that can fit experimental data via variance. most important parameter cut, followed rate, while effect speed...

The prediction accuracy of the simulation cutting process is related with description nonlinear behavior material at extremely high strain, strain rate and temperature in machining. In this paper, an integral Johnson-Cook model presented to characterize mechanical work materials machining, parameters are determined by fitting data from both quasi-static compression tests. Then equation 2Cr13 stainless steel derived method used finite element orthogonal carbide tools. At last, result verified...

Machining of carbon-fiber-reinforced plastic (CFRP) is still a challenging due to its inhomogeneous and anisotropic properties, which often lead damage such as the delamination fiber pullout. The chip formation mechanism in machining CFRP completely different from metal cutting. In this paper, two-dimensional macro equivalent homogeneous finite element model established simulate dynamic cutting processes unidirectional (UD-CFRP). material constitutive, initial failure criterion evolution...

Most of the traditional methods light plane calibration obtain equation by extracting feature points, but efficiency obtaining points is low and number insufficient. To improve accuracy, this paper proposes a method to solve according Plücker matrix. This improves extraction accuracy centerline bar avoiding intersection with chessboard on target reference object converts center line into matrix form. The world coordinated system obtained homograph. According external parameters, camera...

By dry cutting 34CrNiMo6, hard-machined material, with carbide tool and ceramic tool, experimental analysis was carried out in wear force. Cutting the process is researched order to obtain patterns analyze influencing factors. Meanwhile, it found that force parameters (cutting speed, depth, feed) changes regularly, then experience formula of can be established.

Data timeliness of cutting process data is so intenser under the new situation than ever .It’s especially necessary to propose physical model on which optimization parameters based. In this paper mathematical established by analysis measured from cast iron experiments, then use MATLAB genetic algorithm calculate optimum combination parameters. The results show that could improve production efficiency in practice.

In order to solve the problems of manual extrusion with scraper on granulation network, such as high labor intensity, low production efficiency, bad environment and safety, a set equipment for automatic silicon mixture was developed. The main technical requirements, mechanical system design composition are introduced, electrical control is expounded. results show that can realize silicon-based mixture, efficiency high. has been successfully applied certain enterprise.

Recently, the research and exploration of ocean has attracted attention a large number scholars. Due to light scattering absorption in underwater imaging, fish observation images cause imaging blurred details lost. To handle above limitation, an polarization recovery technique is proposed recover visibility restoration color correction images. First, CIE-Lab model, morphological filtering used repair missing L channel, performed on A channel. Secondly, RGB adaptive contrast stretching...