Sun Yize

Research on Jacquard Control System for Three-Pile-Height Carpet Tufting Machine

This paper addressed the development of jacquard control system for three-pile-height carpet tufting machine. The tufting machine adopts electromagnetic clutches and servo motors as yarn-delivery mechanism. Base on the jacquard principle, design the hardware of the control system, analyzed the digital control logic for servo motor and clutch base on given design pattern, and developed the control software to realize the jacquard control. Utilize industrial computer and I/O boards to control servo motor and clutches, the IPC converts pattern information into the control information, drive servo motor to real time trace the main axis rotation, controls the state of magnetic-clutch through I/O board, and get three-level loop tufting carpet.

Modeling and analysis of the carrier arrangement in three-dimensional circular braiding

In this paper, the carrier arrangement in three-dimensional (3D) circular braiding is studied. To obtain suitable arrangements, the guide grooves of carriers are defined and divided into several types. Restricted conditions of the carrier positions are derived by obeying the characteristics of the carrier motion. Based on the restricted conditions, a mathematical model is established and applied to determine the possible carrier positions. Using the model, reasonable carrier arrangements are discussed. In comparison with practical engineering, the model is proven to be a useful tool for the 3D circular braiding process and helpful for designing a 3D circular braiding machine.

Effect of ultrasound on the quantitative analysis of wool in blends by chemical reaction with a mechanical device

The purpose of our research is to explore the effect of ultrasound applied on the quantitative analysis of wool in blended fabric by chemical reaction with a mechanical device. One cylindrical container for blended fabric for the whole process is designed, and detailed observations are made of the step of wool-dissolving assisted by ultrasound. A ventilation hole is essential for the fabric container or else the solvent will be unable to transcend in and out of the fabric container smoothly. For fabrics that cannot be untwisted into yarns, shredding into strips is a reasonable alternative. The fabric piece in the fabric container weighed 0.5 g and the appropriate time for dissolving was 40 minutes. As compared to the traditional manual method, dissolving in the fabric container assisted by ultrasound is equivalent, but is more convenient for mechanization and automation of the whole quantitative analysis.

Application of Power Ultrasound to Chemical Dissolution for Quantitative Analysis of Cotton and Polyester Blended Fabrics

In this paper, the feasibility of applying ultrasonic technology to quantitative analysis of cotton and polyester blended fabrics by the chemical dissolution method is explored. Four varieties of blends with different cotton contents were employed and dissolved in sulfuric acid solution with ultrasound assistance. Although three different frequencies: 20, 28 and 40 kHz were adopted, the experimental results indicate that there is no difference between them. For some fabrics that cannot be untwisted into yarns, ultrasonic technology has good experimental results while only needing a fabric form prepared from a small, long strip. By comparison with the traditional mechanical oscillation method stated in ISO 1833-11:2006, the more meaningful role of ultrasonic lies in the fact that the experimental time and usage of solvent can be reduced by half, which is in agreement with resource savings and environmental protection. Broadly speaking, the study demonstrated that ultrasound assisted chemical dissolution for the quantitative analysis of cotton and polyester blended fabric is feasible.

Profile Error Analysis of Following Ground Crankshaft Using Robust Gaussian Regression Filter

In order to control profile error, many precision grinder manufacturers use profile error pre-compensation method, however, when there are outliers in the original profile error measured data, the compensation accuracy of profile error will be greatly influenced and even the work piece will be scrapped. In this paper, in order to overcome this problem, a robust Gaussian regression filter is researched, at the same time Gaussian filter and Rk filter are used. Three filtration methods are applied based on the same set of profile error data with the same outlier. Comparing the analyzed results, it is obvious that the robust Gaussian regression filter has the strongest anti-outlier capability. The application of this kind of filter is of great significance to improve the crankshaft following grinding machine reliability and performance.

Research on Yarn Tension Modeling in Carpet Tufting Equipment System

Precise pile height is an essential quality measurement for sculptured-style jacquard carpet. Constructing correct the yarn tension model is the key to accurately control carpet pile height during manufacturing carpet. This paper described a standard tufting equipment system with essential components in the yarn path. First, the relationship of pile height and pile tension is formulated. Then, the A. P. Minakov Euler formula is introduced into yarn tension modeling which including the yarn guides, sub-line frame, and puller rollers parts. Finally, this tension model is validated by comparing yarn tension simulation result data and experimental measuring data.

Direct3D Based Multi-level Tufted Carpet Appearance Simulation

This paper proposed a simulation for tufted carpets appearance based on Direct3D. By analyzing the space structure of tufted carpet, using arranged loop pile 3D model on backcloth according to design pattern and process variable to simulate tufted carpet appearance. Use NURBS curve to create loop pile model. The texture mapping technology is adopted to simulate the appearance of yarn. Light model is setup for tufted carpet simulation in Direct3D. Using methods similar to physical simulation to simulate loop pile deformation caused by extrusion, and achieve more satisfactory results. Contrasting to planar simulation of tufted carpet, the 3D simulation could reflect the pattern by showing the height difference between loop piles. By changing the camera, the new simulation image can be created from different viewport. The test show the three-dimensional simulation of multi-level tufted carpet based on Direct3D is both feasible and effective.

Spatial Structure Analysis and Simulation of Multi-level Tufted Carpet

To help design complex pattern for multi-pile tufted carpet, this paper conducts the study on application development to simulate the appearance of tufted carpet in three-dimension (3D). First set up the 3D geometrical model of loop pile with NURBS curves in 3ds Max. By comparing the models with different loop pile’s cross section and trajectory, an appropriate model was proposed. Process variables also have a great impact on the result of the simulation. The application was developed with Visual C++ and Direct3D. The simulation allows to visualize the tufted carpet in 3D from any point of view. Dislocation and deformation between loop piles have also been achieved. The results indicate the spatial structure of the loop pile has a great influence on the tufted carpets’ appearance, and plays a more important role in appearance simulation.