Papers by Author: Shan Jiang

Abstract: This paper presents a nonlinear model of the pulse width modulated(PWM) pneumatic servo systems with long transmission lines which has a huge potential to be used in the automatic production lines and other industrial applications, for the advantages of low cost and clean. An averaging approach is adopted to describe the equivalent continuous-time dynamics of a PWM controlled nonlinear system. With this model, the simulation is taken with a fuzzy logic controller. The simulation results indicate that the PWM pneumatic servo system with long lines have good performance both in the position control and tracking ability.

Abstract: Biopsy precious research has an important relationship with treatment efficiency and side effect complication. Most of the investigation is focus on the non-creatural material which is used to substitute creatural soft tissue for precious research. The aim of this paper is to develop a prescription that can be used for opaque and transparent PVA making which has similar mechanics property to the creatural tissue. The preparation, characteristics, and the results of PVA hydrogel on the composite material are studied as the key investigation. Porcine liver tissue property is also tested as a consultant for PVA material preparation. Comparing with the liver tissue test result, certain component ratio and freezing-thaw circle are determined. This PVA hydrogel material shows big potential in the creatural material substitution application. This research will benefit others who are interested in using non-creatural material to do experiment or surgical technology training.