Applied Mechanics and Materials Vols. 672-674

Abstract: In view of solar arrays applied in large-scale stratospheric airship, modular thinking was proposed by reasonable decomposition of solar array to design composite maximum power point tracking (MPPT) controller where the input and output are both in parallel, which ensures maximized solar energy output on a limited area. And each solar array sub-model was equipped with independent MPPT controller to control power tracking separately. Then, the solar array composed of three sub-models was used for simulation and its result indicates that MPPT controller of each sub-model can track the power quickly, and the output power can reach 93% of maximum input power when the efficiency loss of converter in reality is not considered . So, the model constructed in this paper can be used to optimize the design and analyze output characteristics quantitatively for the large-scale stratospheric airship's solar array.

Abstract: Aimed at improving the dynamic response of the lower limb for patients, an impedance control method based on sliding mode was presented to implement an active rehabilitation. Impedance control can achieve a target-reaching training without the help of a therapist and sliding mode control has a robustness to system uncertainty and vary limb strength. Simulations demonstrate the efficacy of the proposed method for lower limb rehabilitation.

Abstract: This paper proposes an auto-focus method that is based on Ostu segment. The method uses the variance of the two classes of the segment results as the guidance of the auto-focus system. This guidance function responses to wide range of object distance range, it has a strong anti jamming ability and it provides a wide range of the guidance value. The result shows that this method can work well and the time it takes to focus is unconcerned to the position when the focus process starts and it responses to a wide range of object distance.

Abstract: Based on AC servo system of deep hole processing,a new kind of open CNC system is proposed by calling the dynamic link library under Windows operating system, which is made up of googol motion controller GE-400-PV,Panasonic MINAS driver and AC servo motor, has good man-machine interface, solved that the traditional methods is difficult to satisfy the practical requirements in the precision and efficiency of the deep hole processing, experiments show that, the control system can achieve the effect of precision processing, fully meet the requirements of mechanical technology in practical application.

Abstract: The electro-hydraulic position servo control system is a typical complex nonlinear system. It is difficult in achieving the control which has high quality performance.To overcome the effects of non-linearity, parameter uncertainty, external disturbances and load changes, the design of controller is particularly critical. This paper summarizes the controllers which are applied widely: PID controller, fuzzy controller, neural network controller and hybrid controller. Additionally, the paper analyses their performances. At the same time, this paper also points out the prospects of the controllers.

Abstract: Abstract. Because of the characteristics of public buildings, waste exists in university building heating. The traditional time-sharing heating method is opening valve in heating time, and intermittently open valve in anti-freezing time. This heating strategy without considering the realistic weather factors leads to problematic application of heating. According to above situation, this thesis presents a method which intelligently change the watts of heating. Experiment shows that the new metod can intelligently switch on-off valve, and provide a safety and comfortable surroundings for residents. Moreover. Comparing with time-sharing control scheme more energy is saved.

Abstract: There are many rich and plain ecological thoughts in Chinese traditional architecture commonly. The traditional buildings are well adapted to local geographical features, whether natural or cultural morphology. Affecting of traditional philosophy and ecological ideology, there are enough ecological spirits from the settlement pattern, architecture form, the construction method. Through the research of the ecological environment and ecological aesthetics of traditional architecture, people can look for a sustainable development of the environment for human survival way.

Abstract: The truss structure has characteristics of small mass with high rigidity etc., so it is still practical in structures and researched by engineers and scientists. Here a truss structure with the paraboloid top surface is presented; several truss forms of the octahedral space units are connected into it. The equilibrium matrix is calculated by the force-density method. From the equilibrium matrix, number of the self-stress mode and number of the displacement mode of the structure is calculated. According to the obtained result, the structure is proved to be in equilibrium. Through the ANSYS software, the truss structure is researched for deformation under outer forces and it is proved that the structure has certain rigidity and withholding capacity.

Abstract: On the basis of rigid pile composite foundation mechanism, This paper makes assumptions and establishes settlement calculation models, then applies shear displacement method to solve interaction flexibility coefficient of the pile-soil system and raises a rigid pile settlement calculation method, considering the effect of cushion.By calculating a certain experiment, it was found that theoretical and measured values of the relative error is smaller ,which can provide a reference for settlement calculation of rigid pile composite foundation in engineering.

Abstract: Taking regions of hot summer and cold winter as the research object, this paper researched the characteristics of climatic resources and economic condition of the regions, summarized the active and passive adaptability of building energy-saving technology under local climate condition and economic condition, thus it provided reference and guidance for the future development of building energy-saving technology in hot summer and cold winter regions.