Papers by Author: Jian Ming Zhan

Abstract: At present, in the aquaculture environment, bait casting process of feeding machine is using time quantitative; such feeding way did not consider too much fish feeding law which will cause bait wasting and environmental pollution. An effective way to solve the problem is how to set the feeding amount through observing the fish aggregation. An intelligent bait casting method is proposed in this paper based on the machine vision technology, according to calculate the fish shoal area and shoal ratio in the feeding process. The calculate method of the fish shoal degree and flow chart of the main program is introduced. The feeding quantity is more close to the fishing bait habit. The advantage of using this method is making the bait casting more scientific and reasonable, not only saving the breeding cost, but also reducing the environment pollution.

Abstract: In order to achieve the performance of the steer-by-wire force feedback based on magnetorheological fluid (MRF) damper, an experimental system was developed. The aligning torque model and the return model based on MRF damper were built up. The general structure and hardware components were introduced. The change course of feedback force is achieved followed the change of the current of the MRF damper. Experiments showed that the force feedback system based on MRF damper can be used for automobile steer-by-wire system in the little angle.

Abstract: A new shape-adaptive compliant tool system is developed in this essay, which can be effectually integrated with industrial robots and five-axis NC machines. The main principle of the above compliant tool system can be described as follows: a passive servo mechanism of bi-directional rotating sphere hinge, working with the robots to control the tool-path which can meet the requirements of the adaptive capability on free-form surfaces. The normal polishing force could be controlled by the designed linear stepping motor and column helix spring system. The virtual prototyping of the tool system is created in ADAMS, and used to take the simulating experiments on workpieces which have typical free-form surfaces. The experimental results indicate that the tool system developed in this essay performs well on shape-adaptive capacity on free-form surfaces.

Abstract: This paper proposed a new ballonet polishing method for the precise polishing of aspheric parts. The method is based on the integration of a MRT (Magnetorheological fluid Torque servo)-based ballonet polishing tool system and a CNC lathe. By using this method, the decoupling control of force-position-posture can be realized in polishing process. The structure and working principle of the polishing tool system were introduced. The material removal model for ballonet polishing was established according to Preston Equation. The main factors affecting the material removal were discussed, and the control model of uniform removal was put forward.

Abstract: When a robot is used to polish or finish a curved surface, both feed movement and contact force have to be controlled at the same time so that the polishing tool would machine its work-piece at the right position in right posture with required force. In this paper, a passive wrist system is developed to adapt the shape of the machining curved surface by changing its posture along with the surface. And under the Fuzzy-PID policy, polishing force is controlled at a stable value in the normal direction of the named machining point while the polishing tool moving along the curved surface by multi-point machining. It means that the passive wrist system and the model of the surroundings could be used in force controlling when robots polish free-form surfaces with multi-point machining by a grinding ring.

Abstract: A small polishing robot must be made to adapt the change of curvature and slope of the cutting curved surfaces when it moves on the large curved surface. This paper develops a small moving robot to move on the large curved surface and polish it which can adapt the change of curvature and slope of the cutting curved surfaces. It also establishes the kinematics model and the inverse kinematics for movement control of the robot. By analyzing the motion characteristics and the processing of automatic polishing, the paper develops the posture equation of the robot. Experiments shows the small moving robot is capable of adaptability in polishing curved surfaces.

Abstract: Because of the industrial robot’s advantages and characteristics of degree of freedom, it is broadly applied in mold and die of curved surfaces polishing. But its excessive degree of freedom also brings great difficulties in programming for there is CAD/CAM software can do it well. By analyzing the ISO NC code and robot’s programming criterion, this paper develops off-line programming software for industrial robots in free-form surfaces polishing.

Abstract: When nano-abrasives of high speed polish work-piece, they cut it and crush it and there are brittle fracture and surface distortion. For work-pieces of hard-brittle materials, there should be no surface distortion. Therefore, the efficiency of nano-abrasives polishing work-pieces of brittle materials should be much lower than that of metals. In this paper, work-pieces of Cr12MoV and glass K9 are polished by nano-abrasives driven by high speed hydrodynamic suspension fluid to study how it works. The experiments show that the efficiency of nano-abrasives polishing work-pieces of hard-brittle materials is much higher than that of metals.

Abstract: An adaptive tool system of polishing robots for large freeform surface which is installed discoid tool is proposed. To improve processing efficiency, the mechanical of adaptive tool system adjust to curvature changing of large freeform surface is designed. Adaptability of the processing is analyzed and simulated, and kinematic equation of tool system is established. The polishing process of large freeform surfaces with tool system is analyzed.

Abstract: Aspheric parts are attracting many researchers’ attention for their excellent optical properties. The commonly used manufacturing technology for aspheric parts are mainly based on dedicated high precision machines, resulting in high cost and restricted application fields. To polish this kind of parts on general CNC machine tools, however, the surface quality improvement is limited due to the problem of force-position coupling. In order to solve this issue, a force-position decoupling control method for abrasive polishing was studied, a corresponding comliant polishing tool system was developed, and the mathematical model of the tool system was established. In addition, a polishing force controller was designed, and the performance of the tool system was numerically simulated. Simulation results showed that the polishing tool system can effectively achieve the tasks of force-position decoupling and the stable control of the polishing force.