Advanced Materials Research Vols. 971-973

Abstract: Using the chip MC9S12XS128, two-wheeled self-balancing robot control system is designed. Its posture information is detected by accelerometer MMA7260 and gyro NEC-03, multi inertial sensor data fusion is realized by Kalman filter, posture data optimal estimation is gotten, and the accuracy of posture sensing system is improved. Using integral separation PID control algorithm, controlling the left and right motors are accelerated or decelerated, self-balancing control of two-wheeled robot is achieved. The experimental results show that, using the hardware platform MC9S12XS128, Kalman filter algorithm has high efficiency and posture data fusion is accurate and reliable, requirements which are posture optimal estimation and inclination data real-time feedback are met, and the system is stable and can accurately and quickly realize self-balancing control of two-wheeled robot.

Abstract: To solve the synchronous belt drive design and 3D modeling problem, a synchronous belt drive design system has been developed with the Visual Basic language and SolidWorks platform. Applications have shown that this system can realize design calculation of the synchronous belt drive and the 3D modeling of spare parts and assemblies like the small belt pulley, large belt pulley and synchronous belt, as required by the customer. Also, it has a user-friendly interface, handy operation, simple operation, and accurate design results, to effectively shorten the design period.

Abstract: Based on the independent design front wheel drive vehicle traction control system (TCS), we finished the two kinds of working condition winter low adhesion real vehicle road test, including homogenous pavement and separate pavement straight accelerate, respectively completed the contrastive experiment with TCS and without TCS. Test results show that based on driver (AMR) and brake (BMR) joint control ASR system worked reliably, controlled effectively, being able to control excessive driving wheel slip in time, effectively improved the driving ability and handling stability of vehicle.

Abstract: Completed solid model of hydraulic mechanical power split CVT using Pro/E software basing on the transmission principle, achieved the whole transmission without interference assemble by the interference analysis and checking the gap. Carried on dynamics simulation analysis using ADAMS software, obtained the variation of plungers’ centroid and the bearing force in the rear end cover, it laid the theoretical foundation for subsequent experimental analysis.

Abstract: To find out the influence of particle shape on the force situation and sampling efficiency of the drilling tool, the discrete element method is employed to build the lunar regolith model and simulate the interaction between soil and drilling tool. A three-dimensional contact model is introduced to represent the impact between particles. To make sure the validity of the model, a triaxial-test is conducted to optimize the micro-parameters of the model. Then, the model is employed to the simulation of drilling process. From the computational simulation results, conclusions can be made: the particle shape will change the interlocking between particles, and the strip particles have the largest interlocking which makes the force situation largest and the sampling efficiency smallest.

Abstract: In the numerical control turning processing, for some of the special contour parts, G71 and G73 instructions are difficult to handle.The ball tool is often used for turning,but the programming is more complex.By the system macroinstruction of FANUC-0iCNC system, this paper writes the preparation of the outer contourloop, thus simplifying the ball tooling special parts operating procedures, and the processing efficiency is improved .

Abstract: The fault diagnosis of wind turbines is difficult because of the wind speed changing. To solve this problem, a method designated as Hilbert space feature entropy is proposed. The information entropy based on HHT is used to describe the wind turbine bearing vibration signal under different wind speeds. Using this method to analysis the fault of the D70 type wind turbine bearings, which proved that this method can effectively identify the fault of wind turbine bearing under different wind speed . Thus the method can be used as index and basis of the fault diagnosis of wind turbine bearing.

Abstract: The running process of rolling bearing is often nonlinear and abnormal. Therefore, this paper uses the method which combing KICA and LS-SVM to achieve bearings' fault monitoring and classification. Firstly, the vibration signal is mapped into the high dimensional space by using kernel methods, constructing the I2, Ie2 and SPE indicator in the high dimensional space to monitor the process data. And then when the fault occurred, extracting the time domain and wavelet energy features to construct the multi-domain mixed feature set, and input the feature vector into LS-SVM for classification. Experimental results show the method can complete the fault monitoring and classification of rolling bearing effectively.

Abstract: Taking the block of a diesel engine as example, the entity’s geometric model is constructed according to reasonable simplification of design. Research was made on the effects of the FEM modal analysis results with different meshing densities.The results provide reference for the choice of element in further engine modal analysis. The results also provide basis for further structure dynamic analysis and control of noise of the diesel engine.

Abstract: Hydraulic pipe is the one of the most important parts of the airplane. It is the channel to provide energy to the hydraulic system and has the characteristics of severe vibration, high temperature and easily broken. There still not mature equipment to detect its hidden problems so far. The text analyzed the causes of the pipe fracture such as improper tube chosen, overbending, incorrect arrangement and tubes vibration, put forward corresponding solutions and provide references for plane tube designing and routine maintenance.