Applied Mechanics and Materials Vol. 678

Abstract: For armored vehicles electrical system fault diagnosis of fault original data collection difficult situation, this paper introduces the fault diagnosis technology based on fault tree model and fault diagnosis based on neural network technology, and the two kinds of fusion technology, complement each other, with a certain type of equipment control system as an example the case analysis, illustrates the fault tree of the neural network and the rationality and validity of the integrated fault diagnosis thinking.

Abstract: The estimation and detection of sensor bias fault in a dynamic system is discussed. The development of more general methodology for diagnosing sensor bias faults in a dynamic system which depends on the state of the system is established. The non linearity in the system nominal model is assumed to be the function of input and output only, this note used the adaptive technique of model based system and Kaczmarz’s Projection algorithm. An Observer is designed to generate residual of the system which indicates the presence of fault and initiates to estimate unknown sensor bias in the presence of model uncertainties. The tank level system is considered for simulative example is presented to illustrate the methodology. The robustness, sensitivity and stability properties of the dynamic system were analyzed.

Abstract: The existing dynamical systems of wireless capsule endoscopy are studied and analyzed. Based on the shortcomings presented in paper, a novel driving method is proposed. That is driving the wireless capsule endoscopy with three-dimensional orthotropic magnetic field outside the human body, and the resultant magnetic field can be obtained and adjusted through the electric current flowing in three coils orthogonal to each other. This paper focuses on the analysis of complex moving mode of wireless capsule endoscopy, and the result is very important to the design of drive and control circuit.

Abstract: The optimization design method of geometric parameters of skid shoe which is used to subject weight of marine structures is proposed. Considering skid shoe as steel frame structure, total weight and the bearing capacity of the skid shoe are selected as optimal objectives, and geometric parameters of the skid shoe are taken as design variables. Taking the strength, stiffness, local stability of the skid shoe as the constraint conditions, multi-objectives constraints optimization model of geometric parameters is established, and solved based on complex method. According to research results, a computer program has been developed using VC language. Then geometric optimum parameters of skid shoe in service of CNOOC are analyzed by the program. The results show that optimized design decreases steel volume, steel plate thickness by 28.7%, 18.4%, respectively, compared with original design. The optimization method has a series of advantages, such as simple model, fast calculating speed, high calculation accuracy.

Abstract: The rope haulage monorail transport system is an important kind of subsidiary transport system in the underground mine. We propose a control system using frequency conversion on rope haulage monorail transport system in this paper, which consists of PLC control console, AC inverter, speed sensor, over-wind protection switch, sound-light alarm, leakage monitoring device, etc. Our control system can realize the start-stop control, the forward and backward control, the frequency conversion control, the over-wind protection, and so on. This control system can also real-timely detect and display the status information of transport system. The field experiments have showed that our control system using frequency conversion can well satisfy the needs of automatic operation of rope haulage monorail transport system.

Abstract: Due to the influence of robot arm’s and patient’s cantilever’s weight a drive motor with large drive torque was required in the design of upper-limb rehabilitation robot. In order to solve this problem, a new gravity-supporting system that combines gas spring and tension spring to provide supporting force was presented. Due to the use of this device in Upper Limb rehabilitation robot, the power and torque fluctuation of the driving motor can be reduced and the security and stability of robot can be increased. First of all, the movement mechanism was designed and the theoretical analysis is given to prove that it can reduce the driving torque of motor effectively. Three dimensional model of the device was created by Pro/E and was imported into ADAMS/view for the dynamic simulation and got the change curves of driving torque on the condition of the supporting device or not . In the end, the experimental data verify the application of the device that extreme driving torque of robot was decreased over 50%.

Abstract: In order to strengthen the accuracy and stability of the measurement information, and to enhance the safe and stable operation of the new generation intelligent substation and smart grid, it studied the metering abnormal diagnosis technology, put forward the design scheme of the metering abnormal and online diagnosis system of the new generation intelligent substation, realized real-time processing of the metering abnormal and online diagnosis analysis of the abnormal reason. The analysis model for experiment was set up. The results and tests show that the metering abnormal and online diagnosis system of the new generation intelligent substation can make the real-time analysis and review, and real-time monitor the working condition of the metering system for the whole substation. The design and implementation of the system provides a good platform for realizing the reliability, stability, versatility and interconnection of the metering system of the intelligent substation. It is suitable to the construction of the new generation intelligent substation.

Abstract: The paper research a health examination robot, which set height, weight, blood pressure, blood glucose, cholesterol, blood oxygen, electrocardiogram (ECG), energy check in one certain. In the design, adopt 32 bit embedded ARM micro controller NuMicro NUC140, RFID card reader, oxygen check control module and ECG check control module, taking into account the system connection and RFID identification, parameters of historical data query and ECG check process. Experimental data show that system functions are realized and to promote low-cost medical treatment.

Abstract: Through the way of imposing sinusoidal torques of certain frequencies and amplitudes on the steering engines in servo state, and at the same time, measuring the changes of steering engines’ shaft angle, the system measures the steering engines’ stiffness. In the design of its structure, a frameless direct drive torque motor is used to provide loading torque, while with the aim of improving the torque loading performance and simplifying the control model, a spring beam is used to transfer torque. A control mode of three close-loop including torque, position and current is applied and a kind of explicit torque control based on position inner loop is achieved. The simulation results show that the desired goal can be achieved, which means that the amplitude and phase errors of the loading torque can both meet the requirement.

Abstract: The maximum power point tracking (MPPT) for the small-scale wind power generator systems is a hot research topic. We presented a novel solution for MPPT in 2013 that eliminates the disadvantages of conventional methods, such as low reliability and high loss. The wind power generator system is able to track maximum power automatically without using converters and control circuits. This paper mainly discusses the design method for this novel generator. A prototype has been designed and manufactured, and simulations and experiments have validated the generator system concept.