Advanced Materials Research Vols. 383-390

Abstract: According to the requirements of measurement of plantar pressure and shear stress in the meantime, this thesis puts forward a plan to construct a new insole plantar pressure and shear stress system based on multifunction data acquisition modular and Lab VIEW. Then the hardware part and software part are designed and developed respectively. There are 3 sensors are arrayed at each measurement point, that means 3 sensors are assembled in 3 different directions of X,Y and Z . The piezoelectric ceramic type sensors are designed, manufactured and calibrated according to scientific methods. Meanwhile, the DAQ card is selected carefully. Of course, the software part is developed based on Lab VIEW. A series of tests are performed in order to validate the function of the measurement system. The results satisfy the anticipated design requirements. At last, the problems and application trend of the measurement system are predicted.

Abstract: The essay introduced the design ideas and functional features of the manufacturing execution system based on the soda ash industry, with a view of helping manufacturing enterprises to solve practical problems in their production and management, and providing basis for their decision making.

Abstract: Six kinds of torque-splitting and speed-converging metal V-belt IVPST were raised; their global speed ratio and torque ratio of metal V-belt CVT output to metal V-belt IVPST output were derived. Two different torque-splitting and speed-converging metal V-belt IVPSTs were sum up: series and parallel metal V-belt IVPSTs. In series metal V-belt IVPST, speed ratio changing rate and torque ratio were related to gear ratio of planetary gear train and fixed gear transmission, but in parallel metal V-belt IVPST, that were only related to gear ratio of planetary gear train.

Abstract: A method for mercury high throughput rapid speciation analysis was built by short column capillary electrophoresis (SC-CE) coupled with inductively coupled plasma mass spectrometry (ICP-MS). A micromist nebulizer was employed to increase the nebulization efficiency and a laboratory-made removable SC-CE-ICP-MS interface on the basis of cross design was applied to alleviate buffer contamination of ICP-MS. In less than 60 s methylmercury (MeHg(I)) and inorganic mercury (Hg(II)) were separated in a 16 × 75 μm i.d. short column fused-silica capillary at 21 kV, while a mixture of 30 mmol/L boric aicd + 5% (v/v) CH3OH (pH=8.60) acted as running electrolyte. The precisions (RSD, n=5) of migration time and peak area for MeHg(I) and Hg(II) were in the range of 1.4-2.6% and 3.3-3.4%, respectively. The limits of detection (3σ) mercury species were 9.7 and 12.0 μg/L, respectively. The recoveries for Hg(II) MeHg(I) were in the range of 96-107% and 99-105%.

Abstract: In view of the characteristics of numerical control turntable servo system directly driven by permanent magnet ring torque motor, which is susceptible to load disturbance and parameter variation, a dynamic-integral sliding mode position controller is designed. Dynamic sliding mode control means making differential operation to switching function of conventional sliding mode control, thus, a new switching function can be obtained. The discontinuous terms are transferred to first or higher derivative of control quantity. Therefore, the dynamic sliding mode control law is continuous timely, and then the chattering can be effectively reduced. Meanwhile, in order to ensure the steady-state accuracy of system, the integral term is introduced in the switching function to realize dynamic integral sliding mode control. The simulation results indicate that dynamic-integral sliding mode control of permanent magnet ring torque motor has favorable dynamic response and strong robustness, and it is effective to weaken the chattering.

Abstract: On the basis of contrasting the research of home and abroad, this paper studies array magnetoacoustic tomography with magnetic induction as well logging new method. The paper introduces the design of the pulsed magnetic field for magnetoacoustic tomography with magnetic induction, analyses operational principle and parameters of charging system, introduces the operation mode of the discharging system in detail, the constitution of key parts circular plate coil, and realizes narrow width, high peak and repeat pulsed current with inductive load finally, and we obtained the distribution of the magnetic field. Magnetoacoustic tomography with magnetic induction combines the technology of Electrical Impedance Tomography and ultrasonic imaging, it can provide an impedance image with good accuracy and high spatial resolution, the method has a good prospect of application and extension in detection of resource, medical imaging and other fields.

Abstract: In this paper, the boiling heat transfer test rig was designed and built, while the characteristics of boiling Heat Transfer of refrigerants in micro-channel was researched. The wall temperature of micro-channel was measured by TH5104 Infrared thermography. The results showed that there were obvious variations for wall temperature of micro-channel along the axial direction when boiling heat transfer occurred in the micro-channel. The temperature distribution affected obviously by the heat flux, mass flow rate; vapor quality and heat transfer model.

Abstract: The precise pressure control in common rail is the prerequisite for the excellent performance of common rail diesel engine. Because of the complexity of engine working conditions, conventional PID controller cannot meet the demand of flexible control of common rail pressure, especially when engine load changes largely and rapidly. To overcome the shortcomings of conventional PID, feed forward Active Disturbance Rejection Control (ADRC) has been applied in the common rail pressure control system. The high pressure common rail system layout is drawn and the principle of common rail pressure control is introduced. Four control functions are carried out: “Rail pressure set point calculation”, “Feed forward controller”, “ADRC controller”, and “Flow to duty cycle”. Finally, experimental results comparing between feed forward ADRC controller and conventional PID controller shows that: feed forward ADRC controller is more effective than conventional PID controller because it is smaller in error, quicker in track speed and stronger in anti-jamming ability. It ensures the common rail engine meet the strict specification of the law based on the good dynamic performance.

Abstract: Using magnetron sputtering technology, the CuInSi thin films were prepared by multilayer synthesized method. The structure of CuInSi films were detected by X-ray diffraction(XRD), the main crystal phase peak is at 2θ=42.458°; The resistivity of films were measured by SDY-4 four-probe meter; The conductive type of the films were tested by DLY-2 conductivity type testing instrument. The results show that the annealing temperature and time effect on the crystal resistivity and crystal structure greatly.

Abstract: The stratified water-oil two—phase flow was modeled using VOF method in horizontal pipe and surface tension was taken into consideration using CSF model. It was found that the surface tension had great impact on the small density difference two-phase flow even in large diameter pipe, which would lead the interface curved and pressure gradient increased.