Papers by Author: Wei Min Yang

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Authors: Qian Wang, Peng Cheng Xie, Wei Min Yang, Yu Mei Ding
Abstract: The new micro-nano lamination technology is developed to produce composite materials with alternating layers structure. After polymer melt enter into the unit passing the process of stream-reverse-superimposed, it produces functional composites with dozens or even thousands of alternating layers, it obtains barrier performance that general multi-layer co-extrusion can not compare with. Equipment cost is low and production process is simple in the barrier composite material production process.
Authors: Chang Feng Guan, Wei Peng, Liu Qin, You Chen Zhang, Wei Min Yang
Abstract: A simplified 3D model of a rotational molding machine oven was built, and a numerical investigation was carried out with the RNG k-ε approach in FLUENT. Since the temperature field in the original oven structure was distributed unevenly, three types of reformed designs were proposed and numerically studied. Results showed that by changing the inclined angle of inlet flow to 30° downward, hot air flowed onto the mold surface directly, the temperature field around the mold became more uniform but temperature in the bottom of the mold was still a little bit low. By changing the inclined angle of hot air to 30° downward and 45° rightward and leftward, or by changing both the cross sectional dimension of the inlet to 900mm×400mm and the inclined angle of hot air to 30° downward, the temperature field became more uniform and the average temperature around the mold remained relatively high, these two reformed designs were effective with good feasibility and economic efficiency, which could be considered in the future design of rotational molding machine.
Authors: Zhi Zhong Han, You Cheng Zhang, Wei Min Yang, Peng Cheng Xie
Abstract: PLA is a bio-based biodegradable plastic, which has excellent biocompatibility and biodegradability. Because the mechanical properties of microcellular foaming material is similar to petroleum-based plastics (PS), PLA foams have been considered as ideal alternative materials. However, PLA has several inherent drawbacks such as low melt strength and slow crystallization kinetics, which severely inhibit the PLA foaming process to produce high-density forms and uniform cell morphology. By adding a chain extender or nanoparticles, and blending with other biological materials, these ways could effectively enhance the expansion ratio and the cell density of PLA and improve the mechanical properties of PLA foams. The most current investigations on microcellular foaming of PLA were reviewed in the article, and outlook of PLA foams was raised.
Authors: Gang Gou, Peng Cheng Xie, Wei Min Yang, Yu Mei Ding
Abstract: The ability for polymer melt to flow into the microstructure is a crucial factor for successful molding in the microinjection molding of plastic parts. In this study, a simplified analytical model with a direct hot runner nozzle and was constructed to estimate the filling percentage of mold’s cavity. The filling behavior of polymer melt was observed by 3D simulation software Moldflow. The effects of the mold temperature, melt temperature, injection pressure, injection rate, and packing pressure on the filling behavior of polymer melt were investigated. Results revealed that the filling percentage increased with respect to the increase of mold temperature and melt temperature which didn’t exceed its degradation temperature. The injection pressure and packing pressure dramatically influence the filling percentage, and it made no sense to lift the injection speed to fill the cavity when the injection speed reached the relatively high values, and only processing parameter combined available could guarantee the perfect flow and filling for the microstructure.
Authors: Cai Xia Shi, Wei Min Yang
Abstract: In the engineering background of 1000 cubic meters of anchored tank, the large-scale finite element software ANSYS was used to analysis of modal and transient of oil storage tanks. Completed oil tank model and carried on the modal analysis and then vibration characteristics were gained. On this basis, considering the earthquake excitation, analyzes dynamic response of the anchored tank under seismic load. Then gained the oil tank overall structure of displacement, equivalent stress, axial and circumferential stress. From images can be analyzed that the main vibration mode is multiple circumferential wave, the stress of upper tank and its seams is the largest under earthquake loading and easy to be damaged, strengthen circle should be set up. Through the simulation analysis provided powerful basis for seismic design of the vertical storage tank.
Authors: Ying An, Wei Min Yang, Yang Zhang, Hui Qing Zhao
Abstract: Using of rubber non-rotating drill pipe protectors is one of the most important technology measures to reduce the casing wear and rotary torque of drill pipe in case of drilling deep well, ultradeep well, extended reach well and horizontal well. This paper presents the operating principle of protectors, and investigates the effect on contact pressure with the using of protectors by finite element analysis (FEA). The results give out the theoretical foundation of reducing the casing wear and rotary torque of drill pipe by using rubber non-rotating drill pipe protectors.
Authors: Wei Min Yang, Li Jiao Pan, Peng Fei Zheng, Yong Qiang He
Abstract: Control system with position sensor is susceptible to the severe environment such as high temperature, humidity and vibration, which reduce the stability of control system. Position sensorless control of permanent magnet linear synchronous motor need not position sensor so that it can use in abominable environment. According to three phases voltage and two phases current measured from motor, the position and speed of motors mover can be estimated directly based on extended Kalman filter algorithm which is a kind of recursive algorithm. So position sensorless close loop control of PMLSM can be realized.
Authors: Pan Pan Zhang, Jian Wang, Peng Cheng Xie, Li Lei Miao, Wei Min Yang
Abstract: A new concept of microinjection molding module was designed and presented. The module was designed as a multi microinjection module, which is matched with a vertical injection molding machine (IMM) and can be applied to usual IMMs. A planetary gear pump was integrated in this module to complete the multi microinjection molding(MμIMM)。The module is fixed between the stationary platen and the mold of IMM. The plasticizing unit of the IMM provides the melt and initial pressure for the multi microinjection molding module. With this module, a usual IMM could be upgraded to a precise microinjection machine and has the capability of precise metering for the microinjection molding.
Authors: Dong Mei Jiao, Fang Deng, Wei Min Yang
Abstract: The injection molding of plastic parts was simulated and analyzed by MOLDFLOW. Based on the result of mold flow analysis, we can optimize the structure of the mold, select equipment, determine parameters of process, and predict potential defects. The CAE technology could improve mold design ability, shorten plastic parts development cycle, improve the quality of plastic parts, reduce costs, and strengthen competitive power.
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