Applied Mechanics and Materials Vols. 138-139

Abstract: In order to calculate the interaction between complicated foundation and sluice plate conveniently, an effective method was proposed to solve this problem in the paper. This method regarded the sluice plate and foundation as two substructures, which are connected with chain-bars. The unit displacement of the sluice plate and the settlement of the foundation surface are calculated by the analytical method and the finite element method, respectively. And the counter-force of the foundation is calculated by the mixed method. At the same time, the displacement and internal force are calculated by the principle of superposition. All the results reflect the interaction effect between the sluice plate and foundation fairly good.

Abstract: With respect to aircraft with redundant multiple control effectors, a nonlinear controller, which is composed of a virtual control law and a dynamic control allocation with position constraints of each effector, is designed. Based on Lyapunov stability theory and LaSalle invariant set theorem, asymptotic stabilities of upper control subsystem, dynamic control allocation subsystem and overall closed-loop system are proved respectively. Simulation results show the effectiveness of the proposed method.

Abstract: In view of the shortcoming of the existing structural reliability calculation method, this paper establishes optimization model of the structural reliability index from the geometric meaning of the structural reliability index. Then, the authors propose a method based on improved particle swarm optimization algorithm for solving the reliability method. Particle swarm algorithm is easy to fall into local optimum. So, the authors construct simulated annealing particle swarm algorithm which has the strong local search ability .simulated annealing particle swarm algorithm is a global optimization algorithm. Using it to solve the reliability index can avoid doing partial derivatives to the structural performance function and the deficiency of traditional method is effectively overcomed which is easily being trapped in local optima. Therefore, it is a very effective method to solving the structural reliability index of the complex structure. In the end, some examples demonstrate the validity of this method.

Abstract: As an important lifeline, regelation have a lot of serious effects to the transmission towers and transmission lines. China has been serious affected by the macroclimate, microtopography and microclimate condition, many accidents caused by ice cover occured frequently, it seriously impacted on people’s life and the development of social economy. In order to strengthen and improve the anti-icing capability of transmission tower-line system, it is necessary to study the iced transmission tower-line system. In this paper, the wire model, ground wire model and insulator model were established, and made a reasonable layout at the same time, then the coupled model of the transmission tower-line system is set up. It is supposed that the ice and transmission line are combined closely when there is no external loads, the ice is considered as circular cross-section, the composite structure of ice-transmission line is set up, then the coupled model of the composite structure-tower is set up, the dynamic characteristics of model can be obtained by the model analysis used the finite element analysis software SAP2000.

Abstract: This paper reviewed of the development of highway guardrail status briefly, combined with the median guardrail design principles and requirements, then committed to design a new median guardrail which can improve the overall performance. By using finite element software ANSYS, the new guardrail imposed by the load which the size of the load force the same as auto collision impact, then observed the results to solve and test the strength of guardrail. At last, there was a prospect for future research.

Abstract: By comparing the advantages and disadvantages of several different aerodynamic theories for propellers, the strip theory is applied to predict the performance of propeller at the primary design station of propellers, and the Multiple Rotating Reference Frames (MRRF) method based on solving the N-S equations is applied to evaluate the aerodynamic performance of propeller. The validation of the MRRF method is against the experimental data of a propeller. The comparison of calculated result with the experimental data shows that, the MRRF method used in this paper is reliable to predict the aerodynamic performance of propellers. The cruise altitude of Solar Airplanes is usually very high, so the Reynolds numbers of the propeller sections are very low. The key factor of the aerodynamic design of the propeller is that how to keep the propeller at high cruise efficiency by the output power restriction of the electromotor. The analysis of the designed propeller shows that the cruise efficiency of the designed propeller is no lower than 70%, and the power required at the best cruise efficiency condition is match for the rated output power of the electromotor.

Abstract: In this paper, a new method is given about using Hamilton principle to establish multi-degree-of-freedom electro-hydraulic mix-drive motion simulator model. And dynamic analysis is performed based on kinetics and kinematics. The simulation is done on multi-degree-of-freedom electro-hydraulic mix-drive motion simulator and Hamilton principle. As cases, some calculating results on dynamic simulation are plotted with the help of Matlab Lagrange. The work in the paper could be seen as a theoretical basis to research motion simulator in depth.

Abstract: When production needs, the technology of aquifer thermal energy storage (ATES) can achieve cooling or heating by running the “underground cold water reservoir” or the “underground heat water reservoir”. In this paper, taking Sanhejian Coal Mine as an example, we discuss that with the same pumping and irrigation flow in multi-wells, distribution and change of temperature field in aquifers when energy storage system runs. The simulation results of aquifer temperature field show that any cold water well running can make temperature around the centerlin rise, and the rate rose from 0.4 °C to 6 °C as time increases. Any cold water well running can make the lowest temperature of other cold water wells around it rise 0.4°C or 0.5°C, the temperature of the aquifer whose temperature is below 15°C rises about 1°C or 2°C. It proves that the distance of wells is reasonable. When the whole system runs, the temperature field of 2°C to 10°C change greatly, the temperature field of 10°C to 15°C is stable, which is less affected by heat energy consumption in cold water well.

Abstract: Seismic stratigraphy and seismic geomorphology provides an indication of a carbonate platform’s internal and external architecture. High quality 3D seismic data integrated with wireline logs and core materials furthers detailed depositional element analysis, lithology prediction and diagenetic modification of the stratigraphic section, which help to build a depositional model, sequence stratigraphy framework and enhance the evaluation of the reservoir potential of this unit and a prediction of fluid flow during hydrocarbon production. This study mainly focus on using 3D seismic data calibrated with core and logs from oil field A to characterize the stratigraphy and geomorphology of the depositional elements of the carbonate reservoir (Aptaian Stage) and infer the process of the deposition where appropriate. Integration of seismic data with well data provides the frame work for reconstruction depositional evolution history the reservoir. The high seismic resolution of the A reservoirs also provides useful analogs for other subsurface reservoirs from similar depositional environments.

Abstract: High Altitude Long Endurance (HALE) Solar UAV is integrated with a series of motor-propeller propulsion systems along the large aspect-ratio wing. These systems have an obvious effect on the flight dynamics of the UAV. This paper established a model for the interaction between distributed propulsion systems and the flight dynamics of the airplane, it was used to improve the computation of the UAV’s flight quality, results with and without the modified model were compared. It was found that the large aspect-ratio wing integrated with distributed propulsion systems can change its stability significantly. According to the result, parameters of the propulsion systems are adjusted to optimize the flight quality and system efficiency.