Applied Mechanics and Materials Vols. 701-702

Abstract: According to the robot positioning accuracy, this paper proposed an error compensation method after updating the controller parameters based on the D-H parameters model and Dynacal system. The proposed method is effectiveand was validated on the developed robot of which the mean error was reduced to 0.092mm. The method can greatly improve the positioning accuracy of the robot.

Abstract: In order to meet the demand of power supply voltage and capacity, power battery usually uses multiple single cells in series. Due to that performance difference will be increased in the process of charging and discharging, eventually it leads to a sharp drop in battery performance and shorten the cycle life. By analyzing the causes of battery failure in advance, the design is based on the energy storage the inductance of the non dissipative equalization circuit. According to the different status of a single cell in the battery pack, the fuzzy control algorithm can fine-tuning the charging current of single battery through balanced circuit, so as to realize rapid equalization charging of the battery pack. This paper makes a comparison with the charging simulation experiment by using charging model of four batteries in series. Experimental results show that the imbalance between the battery pack can cause damage to the battery and cannot make each battery charged in. The designed balance circuit and fuzzy equilibrium controller designed can realize lossless transfer of energy to reduce the inconsistency of each single cell and achieve the requirement of the equalizing charge.

Abstract: Because there are several axles in multi-axle vehicle, steering controlling is very complex. It is proposed to use the front wheel steering angle and D as input controlling variables, and to realize centroid sideslip angle control. A five-axle vehicle model was built with ADAMS software, and the control strategy was built with Simulink software. The steering angle step response simulations were processed, such as only font wheels steering, fixed D value steering, and different sideslip angle control strategy. It is found that for only font wheels steering test, variable sideslip angle control strategy could make the overshoot of yaw rate reduce from 98% to 10%, convergence time reduce to 57%.

Abstract: Spherical hinge as a kinematic pair is widely used in mechanical engineering, but clearance inevitably exists in it and reduces the run precision of the mechanical system. In this paper, two-mode theory of nonlinear spring-damper contact force and modified Coulomb friction model are used for creating a virtual prototype model of a kinematic pair with clearance. Drive force is calculated in 4 kinds of working conditions, 3 different sizes of clearance. Influence of the clearance on accuracy of the transmission force is discussed.

Abstract: The structure and principle of four-wheels independent driving and steering (4WIS-4WID) electric vehicle are presented firstly, and on this basis the structure of network control system base on CAN bus is built. Kinematics and dynamics models of typical steering modes (such as all wheel steering, front (rear) wheel steering, parallel steering, zero-radius steering) are built, and the control strategy is presented. The experimental results show that the control system structure and control algorithm are effective.

Abstract: This paper analyzes the characteristics of the PLC and MATLAB, describes the OPC technology and introduces the system structures and procedures which uses the OPC technology to achieve the exchange of data between PLC and MATLAB system. For example, in the plastic tank temperature control system, it mentions the BP neural network PID control algorithm which is applied to the PLC control system by using the MATLAB intelligent controller. The results show that this control method is simple and the control effect is good, much better than the traditional PID control.

Abstract: Faced with a serious case of energy waste in the city's public lighting, in this paper, we design a streetlamp which can turn on and off based on natural illumination lights. Depending on the people need for each grade road illumination of different time, it can automatically adjusts the applied voltage lighting by using load regulator, to achieve the purpose of saving lights, without regard to seasonal variation. This paper introduces the control principle, hardware and software flow of the system. Practice shows that the system is scientific and reliable and its energy-saving effect is obvious, and the system has high promotional value.

Abstract: Induction heating is widely used in Industry, it’s meaningful to control the process of heating accurately. In the heating process, electromagnetic field and Thermal field are strongly coupled. Through the comparison of two-way coupled and single-way coupled, this paper verified the importance of multiphysics simulation in heating process by simulation of the cycle induction heater.

Abstract: High-load pinhole is the key to improve the loading ability of power units. In this paper, a feedforward compensation method by modified Prandtl-Ishlinskii (P-I) model is proposed to characterize the hysteresis of Giant Magnetostictive Actuator (GMA) used on pinhole boring system, and the validation of model is examined by comparing the input-output relations of model and experimental data under 20Hz. Finally, a feedforward controller of inverse P-I model is designed to compensate the hysteresis. The experiments show hysteresis nonlinearity of GMA is reduced effectively under a wide frequency band from 21% to 2.3%.

Abstract: Using multidimensional liquid chromatography technology, a liquid chromatography sample pretreatment system which was controlled by a microcontroller was designed. Real sample pretreatment experiments have been done. The experimental results showed that the complex samples can be separated effectively with this system according to 3 polarities. The operation of this system is simple, fast and high automatic, which meet the requirements of pretreatment of liquid chromatography complex samples.