Advanced Materials Research Vols. 317-319

Abstract: Green cutting is one of the developing tends in the industry field. Water vapor can be introduced in metal cutting as coolant and lubricant due to its pollution-free, generating easily and unneeded disposal. Therefore, a special generating system is developed to produce suitable water vapor, and a simulation to the velocity of water vapor jet flow is presented. Then tool wear was investigated and a new capillary model is proposed, based on the experimental results. According to the boundary-layer theory, the kinetics equations of flow were solute. The velocity and flux of molecule are presented. In the capillary, the adsorption of tool-chip interface results in boundary lubricating film; the conical shape of capillary limits the depth of coolant and lubricant penetrating; and the negative press is the motility for coolant and lubricant penetrating. The study results show water vapor can decrease tool wear about 10% times and 20% comparing to cutting fluids and dry cutting, and water vapor could be a potential solution of green cutting.

Abstract: The modified electrodes of Mo(W)-S-Ag cluster compounds films on silver surface were investigated by FT-IR, FT-Raman and XPS. The new modified electrodes were applied to the catalytic oxidation of ascorbic acid. This sort of catalytic effects can be inferred because the oxidation peak potentials of ascorbic acid moved to more negation compared with the bare Ag electrode and the oxidation peak currents increased with the increasing of ascorbic acid concentration. The overpotentials of ascorbic acid were significantly reduced. The cycle voltammograms (CV) measurement revealed the linear relationship between the oxidation peak current and the concentration of ascorbic acid ranging among 0.001~ 0.06 mol.L-1.

Abstract: Bearingless induction motor is a multi-variable, nonlinear and strong coupled system. On the basis of working principle of bearingless induction motor, independent control of suspension control windings is combined with rotor flux-oriented control of torque control windings in the paper. Meanwhile, in order to improve robustness and decoupling performance of system, the modified internal model control (MIMC) is applied in the control of two sets of windings to realize the dynamic decoupling of currents and stable control of radial displacement. The results of simulation experiments show that the proposed strategy has good ability of disturbance rejection and robustness, so the stable operation of motor can be achieved effectively.

Abstract: This paper proposes an active mount of naval ships in order to reduce unwanted vibrations. The active mount consists of rubber element and piezostack actuator. To avoid being broken piezostack actuator, the inertial actuator which the piezostack actuator is connected to the inertial mass and rubber element is devised. After describing the configuration of the mount, the active mount system supported by four mounts is then constructed. To attenuate the transmitted vibrations, the feedforward control is designed and experimentally implemented to the system. Vibration control performances such as vertical accelerations are evaluated at each mount and presented in frequency domain.

Abstract: This study presents the configuration and modeling of haptic mater device for minimally invasive surgery (MIS) using ER fluid. The haptic device has 3-DOF rotational motion which is realized by the ER spherical joint. The ER spherical joint is designed based on Bingham model. The haptic master device that consists of spherical joint as an inner electrode and sphere housing as an outer electrode is manufactured. Generated torque of the manufactured haptic master device is then experimentally evaluated with respect to applied electric field.

Abstract: This paper proposes a new brake featuring magneto-rheological (MR) fluid. The outstanding feature of the proposed MR brake is the possibility of compensating for the passive friction completely. It consists of two coils, one quasi-stator and two rotors. These rotors are in relatively reverse rotation mode. After a configuration of this brake is proposed, an optimization procedure based on integrated finite element analysis (FEA) and Particle Swarm Optimization (PSO) algorithm is developed to obtain its geometric dimensions. Then, the simulated performance of the optimized brake is shown with remarkable discussions.

Abstract: Transplanting of plug seedling is one of the most important operations during vegetable and flower production. Due to the higher labor intensity and lower efficiency for the operation, it is difficult to enlarge production scale for vegetables and flowers. Although transplanting of plug seedling is now common method, all operations are still manually conducted in China. To enlarge productivity for increasing food supply, it has become an urgent task to achieve automation of plug seedling transplanting for Chinese horticulture industry. This paper deals with the automatic transplanter for plug seedling, which is significant to promote development of production automation of seedling nursing and transplanting in China. Then, the simple, practical automatic transplanter for plug seedling, including manipulator, conveyor system for plug tray and flowerpots, overall structure and PLC control system was designed. Finally, Prototype was manufactured and performance tests were conducted. Results showed that the automatic transplanter had reliable transplanting performance.

Abstract: Due to the complex nonlinear coupling characteristics of non-bearing induction motor control system, the basic requirements to maintain the stable operation of the bearingless induction motor is to achieve the decoupling control between electromagnetic torque and radial force, and it is also difficult to design efficient and reliable control system in this field. In this paper, the entire control system is divided into the rotating control system and suspension control system, a control method direct slip linear control based on space vector modulation (DSLC-SVM) is put forward. As to rotating part, because of the direct control of the slip, the flux magnitude deviation and the current total harmonic distortion (THD) can be reduced. As to suspension part, the voltage PWM controlled inverter is adopted to improve the utilization of DC bus voltage and reduce the impact of high harmonics. At last, by comparing the simulation results with traditional control methods, the feasibility and correctness of this method are demonstrated.

Abstract: According to magnetic suspension motorized spindle system, high speed motorized spindle system based on bearingless induction motor is presented in this paper. The prototype of high speed motorized spindle system with bearingless induction motor is studied and analyzed by using finite element analysis software Ansoft/Maxwell and Riccati transfer matrix method, and compared with high speed motorized spindle system supported by Active Magnetic Bearing (AMB). The results show that high speed motorized spindle system with bearingless induction motor has distinct advantage of simple and compact structure, which is easier to realize high speed and extra-high speed operation.

Abstract: This paper presents a new design of an electro-rheological (ER) fluid-based haptic master device that is used for a minimally invasive surgery (MIS). This device consists of a bi-directional ER clutch/brake and an ER brake from which a repulsive force is realized. First, the modeling of these clutches/brakes is conducted. In addition, to transmit a complex rotation from the handle of the device to three independently rotary movements, a gimbal mechanism is adopted. At last, in order to evaluate the repulsive forces generated from the device, an experimental test is undertaken.