Papers by Author: Shao Gang Liu

Abstract: Using the methods of grenade explosion scattering the extinguishing agent for crown fire saves has been an important remote way for crown fire saves. Scattering the solid agent from explosion is greatly influenced by external environmental and airflow in fire, which results in the low efficiency of extinguishing agent. Dispersion area of grenade scattering extinguishing agent can be calculated through the combination of numerical simulation and experimental determination. On the base of high extinguishing concentration, the structure of grenade is optimized and the efficiency of extinguishing agent is improved. For monoclonal crown fire, specific central explosive about 1.5% and the ratio of height to diameter is 3.5, the extinguishing agent the dispersion uniformity, use reduced by more than 20%.

Abstract: Since 1985 when the first appear of robots in surgery field, the interest and the amount of research in surgical robots have been increase significantly. We study in this paper the kinematics of a 6dof surgical robot by determining Denavit-Hartenberg parameters using simple approach supported by robotic toolbox. We describe in details the forward kinematics using the D-H parameters, the successful build of the robot was verified by plotting 3D model for the robot in two positions.

Abstract: Since 1985 when the first use of robot in surgery fields, the interest and the amount of research in surgical robots have been increase significantly. Various surgical robot systems have been developed, and many design models have been proposed. This paper discusses the development of surgical robot design and touches some design and control characteristics which are useful for the research in the field. The paper also provides the recent trends in the field and discusses some commercial surgical robots.

Abstract: A firing mechanism with associated pipe for a pneumatic cannon was developed. it can make the pressure of the chamber reach the full pressure immediately in the launching process. The dynamics analysis of the control pin were carried out and kinematics equations of projectile in the launching process were developed. The strength and impact process of the accompanying tube were confirmed by the computation analysis results.

Abstract: In order to study the effect of oil-air lubrication on sliding friction element, the experiments between oil-air lubrication and oil lubrication have been done by using friction-abrasion testing machine. By means of measuring the temperature rise, the friction coefficient of two different lubrication systems in the same conditions and studying the temperature rise and the friction coefficient of oil-air lubrication with different oil flow rate at the same load and rotating speed level, the results obtained show that when the oil flow rate of oil- air lubrication is equal to 10ml/h, the temperature rise of the element is the same as submerged lubrication caused. As the effect of oil aeration, the friction coefficient of oil-air lubrication is higher. When the load and rotating speed is at 1500N, 210rpm level, as the oil flow rate increases, the temperature rise and friction coefficient of oil-air lubrication element decreases significantly, however, they remain almost unchanged with the increasing of oil supply while the oil flow rate is increased to 15ml/h.

Abstract: Part flow and tool flow were the two mainly aspects of the workflow in flexible manufacturing system. During the past decades part flow deadlock was much more considered than that of tool flow. Tool flow deadlock problem in the condition that the production procedure can be interrupted was studied in this paper. The model of machine process based on the Petri net was set up and the definition of tool flow deadlock was proposed. Necessary and sufficient conditions for deadlock and potential deadlock were discussed according to graph theory method. A case was illustrated and showed that this method was to be correct and effective.

Abstract: The main aim of this paper is to study the mathematical model of the single planar capacitance sensor by boundary element method. This numerical method is used to compute the solution of the partial differential equation with complex boundary conditions which was established as the model of the single planar capacitance sensor. We find out the relationship between dielectric constant of the measured object and the capacitance value of capacitance sensors. A single planar capacitance sensor, which was set its specific size, is taken as an example, numerical example shows that this method is effective. The method and results can be applied to the practice of engineering, such as measuring wood moisture content and soil moisture contant, etc.

Abstract: A robot used for industrial spot welding is a 4-DOF serial mechanism, it can be applied to some special industries. There are multi via points known in path, each joint value can be accurately solved by the inverse kinematics. The quintic polynomial interpolation was adopted between each two adjacent desired via points, the continuous trajectory is formed in accordance with the time course. The simulation model is developed using SimMechnics, the movement parameters and path are obtained by simulating, the simulation results indicate that the motional parameters and path can be accurately and effectively obtained for robot analysis and design.