Papers by Author: Wen Hsiang Hsieh

Abstract: The purpose of this study aims at the kinematic study of generalized Oldham couplings by conducting kinematic analysis, kinematic simulation, and prototype experiment. First, the characteristics of generalized Oldham couplings are presented. Then, kinematic analysis and kinematic are performed. Finally, a prototype and its associated experimental setup are established. An experiment is conducted to evaluate the performance of the coupling. The simulated result shows that the output of the coupling is non-uniform, and close to a sinusoid. The experimental result indicates that the experimental output approximately agrees with the theoretical, but with fluctuations and a phase lag.

Abstract: The purpose of this study aims at performing the kinematic study of the coil winder with a RCRC mechanism by investigating the geometry and conducting kinematic simulation. First, the motion principle of the shuttle is addressed. Then, the topological structure of the RCRC mechanism is examined, and its kinematic chain and kinematic sketch are drawn. Finally, a design example of the RCRC mechanism is given for illustration, and its feasibility is verified by performing kinematic simulation using ADAMS software. Finally, the simulated result shows that the shuttle can produce the required winding motion.

Abstract: The purpose of this paper aims at performing the structural synthesis for coil winders of the spatial 4-link type, therefore the atlas of new designs can be obtained. First, the design requirements and design constraints are specified based on the kinematics characteristic of coil winders. Then, the (4, 4) kinematic chains are obtained by number synthesis, and the atlas of feasible chains is generated. After that, the atlas of specialized feasible chains is found. Finally, all new designs are obtained through the particularization process, and two new design are found in this study.

Abstract: The acoustic horn plays a very vital part in high energy ultrasonic machining, and its design is critical to the quality and the efficiency of machining. This paper performs the analysis and design of acoustic horns for ultrasonic machining by employing ANSYS finite element software. Firstly, the theoretical dimensions of the horns are calculated and compared to three commercial available horns with different shapes. Moreover, their natural frequencies and amplitudes are obtained through the simulations of ANSYS. Finally, the numerical results are compared with commercial available horns. The results indicate that not only the natural frequencies of horns designed by theoretical models are more close to the vibration frequencies of ultrasonic generators, but also their amplitudes are superior to commercial available horns. Therefore, the trial and error time, for horn machining and dimensional modification of the horn design, can be greatly reduced by the proposed approach of this work.

Abstract: This study discuss the distribution of the flows when the forced convection impacted on the spin and the static in table tennis; the research method is using the thermal flow in the experiment which the thermal flow will reflect according to the imaging principle when it passes through the spin sphere; this can be used to simulate the flows of balls in static condition and backspin ball in high-speed and low-speed rotation; the air flow passes through the spin sphere and generates the ball pressure which forms the quality variation of the spheres in table tennis competition; the results showed that it has a lower drag force, low fluid momentum and lower rectilinear speed when the sphere is in static condition , low Reynolds number; on the contrary, it has a higher drag force and increasing rectilinear speed of flows when the Reynolds number is high. When the ball is in backspin condition, the flows are symmetrical presented, and then the flows are gradually distributed, asymmetrical presented and are upward. The higher the Reynolds number is, the smaller the wake region is due to that the forced convection effect increased; the smaller the Reynolds number is, the ball will have more significant spin kinetic energy increasing rate when the spin speeds up.

Abstract: The objective of this paper aims at investigating the feasibility of new coil winders with a spatial RSPC mechanism by conducting kinematic simulation. First, the design requirements and design constraints are specified based on the kinematics characteristic of coil winders. Then, the (4, 4) kinematic chains are obtained by number synthesis, and the atlas of feasible chains is generated. After that, the atlas of specialized feasible chains is found. Finally, new designs are obtained through the particularization process. In addition, an illustrated example of the RSPC mechanismselected from the new designs is given, and its feasibility is verified by performing kinematic simulation using ADAMS software. The result shows that it can meet the motion requirement of coil winders.

Abstract: The study aimed at improving the problems of warpage occurring in the mold injection of battery lower cases. Firstly, the effects of variations of molding parameters are investigated in order to minimize the warpage. Secondly, Moldflow software is employed to simulate the molten plastic flow inside the cavity, and followed by the holding pressure analysis. Moreover, Taguchi method is applied to find the optimum distribution of mold temperature, and its results are used to design cooling tubes. Finally, different cooling systems are parametrically simulated and the optimum combinations will be found. The analytical results indicate that the optimum parameters can reduce the warpage problem occurring during mold injection. Therefore, the yield rate of the products can be effectively raised.

Abstract: The purpose of this study is to present a novel concept for inline vibrating conveyors, and verify its feasibility by kinematic simulation. First, new conveyor is presented, and its merits are discussed. Then, its kinematically equivalent linkage is described. Moreover, the kinematic dimensions are investigated from its geometry. Finally, the solid model for the proposed design is established, then kinematic simulation is performed by ADAMS software. The simulation results indicate that the proposed new design can effectively advance the workpiece.

Abstract: The work aims to present a novel press system, and to investigate its feasibility by performing a kinematic study. Firstly, the new design is proposed, which is composed by a motor, a constant speed coupling, a gear reducer, a generalized Oldham coupling, and a slider-crank mechanism. Secondly, its structural sketch is drawn, and its kinematic dimensions are obtained by studying its motion geometry. Then, a design example is given for illustration. Moreover, the solid model of the design is established, and then the validity of the design is verified by kinematic simulation using ADAMS software. Finally, the effects of different link ratios on the output motion are examined by conducting a number of simulations. The results of simulations show that the new design can produce more flexible output motion than a mechanical press. In addition, it has the advantages of lower cost, high reliability, and lower energy consumption, compared to a servo press.

Abstract: The rapidly growing concern about environmental and resource protection have stimulatedmany industrial sectors to solve the disposal problems of used products. The recovery processes canbe simply categorized into material recovery and product/component recovery. Material recoverymostly involves disassembly for separation and processing of materials of used products. Destructive methods such as dismantling, shredding, or chemical operations are normally used. Product recoveryincludes disassembly, cleaning, sorting, replacing or repairing bad components, reconditioning,testing, reassembling and inspecting. These recovered components/products can be reused inrepairing and re-manufacturing. That provides an opportunity in bringing the used products back to an “as new” condition. This paper utilizes the concept of non-destructive method of product recovery processes and develops an automatic disassembly system for white board marker pens. The experimental results show that the cycle time for the disassembly processes is about 3.8 second that is believed to be compatible to the desired feeding rate for manufacturing. In addition, the reused rate for the recovered components is close to 100% except the fiber-refill component.