Applied Mechanics and Materials Vols. 303-306

Abstract: In micro lens, the adaptive lenses are potential breakout in the future. The adaptive liquid lenses had been reported in several literatures. However, it’s regret for existing adaptive liquid lenses who can’t realize zoom synchronously keeping the image surface stable. For solving the problem a pair of all-silicone lenses called lens group was put forward. The lens group was firstly fabricated and assembled. The lens group was researched from theoretical calculation to find the synchronous relation between the front lens and the back lens. At last the lens group was seriously tested including its total focal lengths and image surface drifts. The theoretical researches and the testing result testified the all-silicone lens group was possible to facilitate the adaptive lens into applications.

Abstract: It is very important that the flexible tires have some effects on the movement of the vehicle. To analyze the influence of the flexible tire on different road surface roughness in the steering movement of the vehicle, the paper cites the traditional two degrees of freedom (2-DOF) model for steering movement of vehicle, analyzes deformation of the tires when the flexible tires scroll on the hard and soft road surface. The paper establishes mechanical model about the relationship of the tires and different road surface, and advances mathematics equation in the typical 2-DOF model. To verify theoretical derivation the tests of steering motion of the vehicle are done on the different road surface roughness.The results show that yaw rate of the vehicle is very different on the soft and hard road surface when the vehicle steers along the same turning radius path and at the same speed. The results illustrate that analysis of theory is right.

Abstract: In this paper, the material point method (MPM) is reviewed. Its theory and advantages over other numerical methods are briefly summarized, and current development status reviewed. Due to the unique features of the MPM, it can be a significant tool in marine science research. Potential applications in marine science are also discussed.

Abstract: In this paper, some sufficient conditions are obtained by discussing the oscillatory behavior of solutions for a class of even-order nonlinear functional differential equations, and our results generalize and improve some known results.

Abstract: This paper studies orbital periodic solutions of a Lotka–Volterra difference system. Using a trial method, a condition is obtained for period-3 or period-4 orbital solutions of this system, and we show that the existence of a pair of initial functions of period-3 or period-4 orbital solution implies that they are 3-periodic or 4-periodic.

Abstract: Underwater explosion vessel is the main equipment to experimentally study the law of underwater explosion by small quantity of explosive. It is the main equipment of explosive metalworking. In order to the safe using of underwater explosion container and the efficiency, we must accurately determine the strength of the container. Based on the actual engineering design, the brief summary about engineering design method of 10gTNT equivalent deep water explosion vessel has carried on.

Abstract: Model built for the bicycle, road and the driver and contact established between them is the core technological issue for the study of frame’s deformation and driver’s injury on the electric bike accidents. A rigid model of bicycle, road and obstacle is built by using ADAMS software, and the driver is as Hybrid Ⅲ body collision model by LifeMOD software. Contact between them is established, especially on the driver’s chest to handlebar. Base on the rigid-body collision theory, the collision point of head and the speed of the chest were compared with different speed in the range of 15-35km/h. The simulation results shows that the impact between the rider’s chest and handlebar is the main reason to the difference of rider’s dynamic behave. Simulation results verify the validity of this model and lays fundamentals for the study of driver injury in electric bicycle accidents.

Abstract: Due to the characters of the ultra high pressure vessel employed in food processing, a seal structure was introduced in this study. Then numerical analysis was performed using the larger finite element stress analysis software ansys12.0 for the stresses of the seal structure under internal pressure. In order to solve the contact question of delta-ring seal structure by using face-face contact model, a 3-D axisymmetric solid element was employed to calculate the stresses of the connected location among delta-ring, blind cover and end cylinder, the mises stresses in this structure were analyzed. Thus, the distribution nephograms of the stress on the contact surface were obtained in different conditions. Full-field plastic deformation of seal structure was generated when the inner pressure was larger than 300Mpa. At last, the reason for residual deformation was analyzed.

Abstract: Abstract. In the highly developed stage of economy, information, technology and culture, system research has been conducted on human, furniture, space as well as environment by ergonomics to have the indoor environment adapt to people’s demands on life activities and to raise both the social materials and spiritual life to a new level, which has brought new value to the design world. Focusing on the main line “human-space-environment”, the analysis for a series of psychological and physiological activities produced when people sit on the seat indoors have been conducted on the basis of ergonomics and environment-related behavior theory. So that people can create a safe, healthy, cozy and high-efficient working and studying environment actively in the environment design.

Abstract: Various of cable elements are used in the numerical analysis of cable structures. According to the mechanical characteristics of highline cable system of alongside replenishment at sea, two cable elements are investigated: catenary element, which is the exact solution, and parabolic element, which is the approximate solution but simpler to calculate. The equilibrium equations of each cable element are introduced, and the expressions of tangent stiffness matrix are derived. The tangent stiffness matrix of catenary element is calculated through Newton interactive method.