Applied Mechanics and Materials Vol. 389

Abstract: The field test results show that existing double-pump confluence hydraulic system with constant displacement pump of wheel loader could only save some energy while the load pressure is rather high (>15Mpa in the tests). However, the load pressure is usually low, especially when the wheel Loader is working on bulldozing operation or just steering and running. Thus, an optimized double-pump confluence hydraulic system was designed by adding a proportional valve and adjust operation rule, so that the output oil of steering pump flow into tank by the proportional valve while the load pressure is low and the relative position of joystick is not large (<72%), and in this way the throttle losses is reduced. Simulation results indicate that the optimized confluence hydraulic system could save 26.2% throttle losses while the wheel Loader is working on bulldozing operation.

Abstract: For the flight control problem occurred in 3-DOF Helicopter System, reference adaptive inverse control scheme based on Fuzzy Neural Network model is designed. Firstly, fuzzy inference process of identifier and controller is achieved by using the network structure. Meanwhile, the neural network connection weights are used to express parameters of fuzzy inference. Then, back-propagation algorithm is adopted to amend the network connection weights in order to automatically identify the fuzzy model and adjust its membership functions and parameters, so that the actual system output of adaptive inverse controller control which is adjusted can track the reference model output. Finally, the simulation result of 3-DOF Helicopter System based on the scheme shows that the method is effective and feasible.

Abstract: A simulation system for intertidal zone environment that can be remotely monitored is proposed. The system is divided into the two parts of remote control center and environment simulator, which are interconnected through wireless network technology. The remote control center performs remote monitoring through upper machine software, while the environment simulator can simulate natural environments such as ocean tides, water temperature and light illumination in different types of intertidal zones. Users can change and access the environmental parameters and data of the environment simulator by making instructions at the remote control center. A stable system is realized in accordance with the design requirements, and actual tests show that main features of the simulated natural environment in intertidal zones are very close to actual environment.

Abstract: Completed the design of experimental apparatus of magnetic levitation based on ADuC832 microcontroller and discussed the experimental results, the relationship between the forces on permanent magnet and the velocity of non-ferromagnetic conductor can be measured with strain gauge position sensor and photoelectric sensor. A magnet can be non-contact driven to rotate around its central axis by moving conductor, the relationship between the rotational speed of permanent magnet and the velocity of conductor can measured with bias circuit, verifying the correctness of the theoretical analysis. The experimental apparatus of magnetic levitation is well applied in experimental teaching.

Abstract: In order to suppress vibration in flexible manipulators, a model of magneto-rheological vibration absorber based on internal resonance phenomenon between the flexible manipulator and vibration absorber is built. And the structure of magnetic circuit is designed, which is used to provide the applied magnetic field for the magneto-rheological elastomer. The total magnetic flux density in air gap of magnetic circuit is theoretically analyzed and verified via the real measured data. It is proved by frequency shift experiment on the beam structure platform that, the magneto-rheological elastomer has the adaptive ability of shifting its natural frequency as the applied electric current changes. Therefore, the magneto-rheological vibration absorber has a wider vibration absorption frequency.

Abstract: For applications of single supply, a digital interface circuit of resolver based on AD2S1200 is designed in a single 5V system. According to the given resolver, the amplification factor and driver capability of excitation signal is calculated and verified. In order to adjust the excitation signals amplitude and provide enough drive current to the resolvers primary winding, an operational amplifier with high current output capability AD8532 is chosen to set an excitation signal buffer circuit which works as a unity gain inverting proportional amplifier. Besides, the design greatly reduces the amount of components which is especially appropriate for the installation in a constriction space. To give a test for the interface circuit, the microcontroller ATmega16 is used to read the 12-bit parallel angle position data of resolver. The test result shows that the interface circuit can not only work well but also obtain an accuracy of angle position within 0.1°.

Abstract: Aimed at protecting synthetic gemstone processing workers from silicosis that caused by continuously working along machines, a remote-control machine based on CAN-bus is designed. This paper focuses on introducing the hardware and software of its control system. ARM processor STM32F103VET6 with Cortex-M3 core is selected as the MCU, and with the application of motor driver, touch screen and special software, the system can implement auto-operation and manual-operation flexibly. Test data indicates that the control system is stable, easy to operate and suitable to be promoted in factory.

Abstract: This work presents a new approach to modeling the dynamic behavior of a viscously damped RF-MEMS switch. The model takes into account the effect of squeeze film on resonance frequencies of the switch structure. It also presents a new approach to modeling the impact force as well as its effect on transient pull-in, and release dynamics of the perforated switch membrane. Simulation results of the proposed model are validated against experimental results of the same exact switch, and the comparison was impressive. Model results show that the model is able to capture the experimental behavior of the switch with less than 2% error.

Abstract: In this paper, a new actuator with nanoscale micro-displacement is reported. The actuator not only can achieve a large stroke and nanoscale positioning accuracy, but also has the advantages of compact, low cost, high reliability and a single control system. The drive is controlled by a single power, and it consists of stepper motor, harmonic gear reducer, screw and the guide rail. The stepper motor is controlled by the pulse train and the harmonic gear reducer has high precision and small hysteresis. The precision screw converts the rotary motion of the stepper motor into linear displacement, and the plunger pushes the target in nanoscale motion accuracy through the guide rail finally.

Abstract: There isnt an efficacious assessment method to learn reliability of fuze electromagnetic inductive setting, only through statistics the numbers of feedback information to learn reliability. The article analyzes theory of fuze electromagnetic inductive setting about circuit. For this problem, each module with the fuze setting system is separated, design out a trial experimental terrace, and build the experimental proposal with changing the environment factors, measure the change of the wave shape characteristic about each module to get the characteristic parameter of fail-safe critical state wave shape of fuze setting. Get qualitative analysis methods to assess the reliability of fuze electromagnetic inductive setting in order to analyzing the electromagnetic inductive setting the setting reliability by the way of analysis to the wave shape distortion state.