Advanced Materials Research Vols. 482-484

Abstract: Aim to study the teaching contents, methods, means, and practice of pharmaceutical analysis course in engineering colleges in order to improve teaching efficiency and quality.

Abstract: A new type of Li-ion supercapacitor was fabracatied with activated carbon as cathode and graphite pre-intercalated Li ion as anode. The electrochemical characterization was also conducted with cyclic voltammetry and AC impedance methods. By this unique cell design , the capacitance of Li-ion supercapacitor keep the same level to double elecric layer supercapacitor ,But the voltage window of supercapacitor can be enhanced from 2.5V to 4.2V.So the energy density of Li-ion supercapacitor can be enhanced 4 times of common carbon-based supacapacitor. There is above 99% capacitance retention for Li ion supercapacitor after 200 cycles at 200mA discharge current. A pure capacitance behavior can be found at the frequency below the knee in its AC impedance spectroscopy.

Abstract: The structure and the operating principle of automobile hydraulic power-assistant steering system (HPS) are studied. The state-pace equation of the system is established by applying power bond graph method. The simulation of HPS is carried on in Simulink which is a software package of Matlab, and the dynamical properties of HPS are analyzed under different conditions. The simulation consequences provide theoretical basis for performance analysis and optimization design of HPS.

Abstract: Compared with link constant hangers, main-compensating constant hangers are structural symmetric, having high theoretical constant force. Swing cams are important component of the device, therefore the design of cam curve is the key of constant hangers. Based on the analysis of working principle of constant hangers, a mechanical model of constant hanger is established, and the differential equation of cam curve is derived by means of coordinate transformation .Meanwhile, spring parameters are determined. Curve equation is resolved and the cam curves are plotted. Then, the influence of spring parameters on cam curves is discussed. Finally, force values acting on the cam and the central rod are calculated according to cam curve. The simulations in this paper can be used to instruct the actual engineering design.

Abstract: The chord vibration frequency analysis is carried out based on the theory of vibration of continuous systems. The finite element software is used to analyze frequencies of different chords, which is compared with the theoretical frequency. The relevant conclusions demonstrate that studies on guitar chords’ sound quality and intonation using proposed finite element method are doable and necessary. It has certain directive significance in guitar production process.

Abstract: To solve higher-order elliptic gear manufacturing problems, this paper builds the model of hobbing process based on higher-order elliptic gear equation, and researches the graphic simulation technology of hobbing process by using tools (inclined) rack. Four higher-order elliptic spur gears and helical gears with different parameters are simulated by Matlab, to verify the processing model built and the condition of hobbing process can be applied. This work provided the theory foundation for the manufacturing modular of higher-order elliptic gear in CNC System and the reference for its manufacture.

Abstract: In order to acquire the best filling time, Mold trial is made by setting different injection time, or Moldflow software is used to analysis data recorded by computer. Whether doing successive trials or being simulated point by point, is very tedious. Put forward a method of using the Lagrange to simulate a curve based on the mold flow analysis, the minimum of the curve is the best filling time. This method can gain the best filling time as quickly as possible, and improve the efficiency of the mold flow analysis.

Abstract: The simulation model of full hydraulic power steering system whose key part is full hydraulic power steering unit is established based on AMESim. According to the parameters from one articulated construction vehicle, the dynamic characteristic of the full hydraulic power steering system can be studied. Through the input from steering wheel and external load in different situations, the response curve is obtained, that can provide references for the design of full hydraulic power steering system in articulated construction vehicles.

Abstract: The development of ESP Hardware-In-the-Loop(HIL) test bench has brought great benefit to the development of ESP system and could shorten the development period. Therefore the accuracy of ESP HIL bench is crucial to the development of ESP system. The adjustment of vehicle parameters is an important section in the simulation model and it decides the accuracy of the bench to a great extent. The vehicle parameters from actual measurements are limited, so it is very difficult to obtain a high-accuracy simulation model. The article offers a way to solve this problem. With CANoe from Vector Corp., the experiment data were gathered from actual vehicle and returned to simulation model through CAN telecommunication. This will enable the simulation model to operate in the same mode of actual vehicle. By contrasting the output of response, the vehicle parameters will be adjusted step by step, until the response of simulation model is same as the one of actual vehicle.

Abstract: There is much technical information of the engine running in vacuum △P in engine air intake system. According of the engine intake system analysis of the formation mechanism of vacuum △P, three-gradient analysis model is established. Then put forward the principle of quantitative diagnosis technology used the △P in automobile fault. Establish the concepts, such as "illegally gas", "quantitative diagnosis" in engine air intake system. Try to build the application system of quantitative diagnosis technology in modern automotive fault.