Papers by Author: Zhi Hua Feng

Abstract: In this paper the rigid-flexible coupling dynamic characteristics for an existing constant temperature oscillator based on ADAMS has been investigated. The unbalance load caused by the rotation of the eccentric mass is carefully calculated. In view of this phenomenon, a new centroid adjustable balancing head is put forward, and the scheme is verified by ADAMS.

Abstract: Owing to spandex silks are very thin and transparent, it is very hard to spot the broken warp without alarm during sewing or weaving. Therefore, the key to solve the problem is to shutdown and alarm timely when warps break. The ways and principles of common warp stop are analyzed in this paper, a new type of warp stop motions is developed for textile purposes to avoid inconveniences and malfunctions of the traditional method. Alarming rate and stability can be improved effectively by the compact and lightweight design of drop stitches, controlling system with converting functions as well as the modified testing, protection, reset.

Abstract: In this paper, we analyzed the data of the 6 body breast sizing measurement parameters of 162 girl participants who were from Jiangsu aged 13-16, which were collected by the manual measurement. Then, the statistical analysis of the measurement data was carried out in the SPSS software, including the correlation analysis and the regression analysis. From the results of the analysis, we got four regression equations and the value range of four measurement parameters, which were used to design the size of the fitting mold of the girlish mold-cup bra.

Abstract: In order to solve the weighing problem of a type of incubator shakers, a new weighing method, combined with numerical analysis and experimental verification, is proposed. The numerical analysis based on the software of ANSYS Workbench indicates that the sum of the two-point strain in the mechanism is found to be constant and there is a fine linearity relationship between the sum of the two-point strain and the weight of load, so as to offer a measurement method for indirect measurement of the loading weight and this measuring method has been verified by experiment.

Abstract: Based on the new simple third-order shear deformation theory, the deflections and stresses of the simply surported symmetrical laminated composite plates are obtained by using the principle of virtual work .The solutions are compared with the solutions of three-dimensional elasticity theory, the first-order shear deformation theory and the Reddy’s higher order shear deformation theory . Results show that the presented new theory is more reliable, accurate, and cost-effective in computation than the first-order shear deformation theories and other simple higher-order shear deformation theories.

Abstract: Axially moving fabric can be met in many textile devices. In most cases, the transverse vibrations of fabric can cause a series of negative influents to the product. In this paper, the transverse vibration of axially accelerating moving fabric, which is excited by velocity fluctuations, is investigated by experimental method. The harmonic varying velocity is achieved through a brushless DC motor controlled by PWM technology based on the embedded microcontroller LPC1768. An inductive non-contact displacement sensor is used to measure transversal vibration of fabric. The motor speed is measured by a photoelectric encoder. The experimental data is processed by measurement platform based on Labview and the analysis is given. Laboratory measurements demonstrate the effect of velocity fluctuations on transverse vibration of fabric, particularly near the parametric resonance region.

Abstract: Due to the complicated structure and the high speed turbulence, it is difficult to measure and analyze the flow field characteristics of the main nozzle by experimental methods, naturally, some software such as FLUENT become a powerful tool to perform the numerical simulation for flow field of the main nozzle of an air-jet loom. The distribution of the airflow velocity and static pressure along axial and radial direction in main nozzle were investigated. The results indicated that the airflow in the main nozzle was extremely complex, its velocity in throat could be sonic and a certain backflow was produced. The research results will play an important role on the structural parameters optimization and energy conservation.

Abstract: This paper is concerned with the design of a control system for a robotic excavator known as the Lancaster University Computerised and Intelligent Excavator (LUCIE). A nonlinear proportional-integral-plus (PIP) control algorithm is developed for regulating movement of excavator arm. The nonlinear dynamics of the hydraulic driven arm is represented using the quasi-linear state-dependent parameter (SDP) model, in which the parameters are functionally dependent on other variables in the system. The model is subsequently utilised to develop a new approach to control system design, based on nonlinear PIP pole assignment. Implementation results demonstrate improved tracking performance of excavator arm in comparison with both linear proportional-integral-derivative (PID) and conventional (linearised) fixed-gain PIP control.

Abstract: In order to release the influence of shedding motion on warp tension fluctuation, easing device is often set on short looms with single back rest system. With the decrease of the beam’s diameter, the wrapping angle formed by warp and the active back rest will become bigger, and the effect of the easing device will be more significant. However, the wrapping angle of the double back rest system is a constant while the change of the beam’s diameter. The effect of easing device on air-jet looms of double back rests system is analyzed in this paper, and conclusion has been made that the easing device can be eliminated on the double back rests system.

Abstract: In this paper, a dynamic model of yarn in sizing machines is proposed. The fluxion in moving speed is taken into consideration. By sliding-mode control, the transverse vibration control of the yarns is studied and the control law based on varied tensions is designed. Numerical simulation are carried out using the finite difference approach and results show that the convergence rate of spacing errors of the yarn is fast and the transverse vibration can be well reduced.