Applied Mechanics and Materials Vol. 459

Abstract: Pointing to the problems of students vague and ambiguous basic concepts on teaching the theoretical mechanics, the training courseware for the theoretical mechanics on the basis of basic concepts based on the Visual basic has been developed. The important points and difficulties have been concluded and the self-test system has been developed. The multiple choice question and judging problem have been concluded, which can provide better conditions for students to study and master this course.

Abstract: In the fierce market competition environment, to maximize the production efficiency, manufacturing enterprises mostly adopt the many varieties of small batch and discrete mode of production. The production process has the very strong flexibility. But the production process are lack of scheduling management or parallel machine production unit mostly adopts the scheduling method of static quota system, so the flexible resource in enterprise production system parallel machine scheduling began to reveal inadequate and it has reduce the production efficiency of the enterprise. This paper provide the Nested Partition Method for the problem, establishing the mathematic models for dynamic scheduling, and developing the corresponding algorithm, in order to improve the utilization rate of equipment and flexible resource.

Abstract: With the highest concentration of motorcycles in Asia, Taiwan was caused a major traffic congestion and air pollution. To effectively reduce these environmental burdens, Electric Motorcycle Industry Development and Promotion Plan was passed by Taiwanese government. With this plan, people was encouraged to invest in mass production of electric motorcycles. This paper uses the Technology Acceptance Model (TAM) to explore consumers behavioral intentions and their influencing factors regarding using hydrogen-electric motorcycles. This is a first in hydrogen battery research, and also one of this papers contributions. Results show that consumers' innovativeness towards hydrogen-electric motorcycles does not significantly affect behavioural intentions. To increase customers' behavioural intentions towards hydrogen-electric motorcycles, the customers' innovativeness towards hydrogen-electric motorcycles should be strengthened by motorcycle manufacturers, and perceived risk should be decreased. Then, to improve customers behavioural intentions towards hydrogen-electric motorcycles in the end.

Abstract: This paper presents an approach for numerical optimization design of blade stacking line for fan/compressor blade. In the present method, the linear interpolation method and Constant-Volume Tetrahedron approach are developed to exchange data between a Navier–Stokes equation solver which is adopted to evaluate the aerodynamic performance and a commercial software which is used to attain the structural characteristics. Both of those two data exchange method have been demonstrates. A simple Genetic Algorithm as a robust design optimization tool is employed to achieve the multi-objective optimization. The proposed approach is then used to optimized a fan rotor blade with different optimization goals to verify the feasibility of the reliability. The results show that, the single objective optimization design can improve the aerodynamic performance or structural characteristics remarkably, but might not promote both of those performances. On the contrary, the multi-objective and multidisciplinary design can improve the aerodynamic performance and structural strength at the same time. So, it can attain higher aerodynamic performance while satisfying the blade strength requirements.

Abstract: With the Melnikov method and numerical methods, this paper investigate the chaotic motions of a damped and driven morse oscillator. The critical curves separating the chaotic and non-chaotic regions are obtained, which demonstrate that when the Morse spectroscopic term is fixed, for the case of large values of the period of the excitation, the critical value for chaotic motions decreases as the dissociation energy increases; while for the case of small values of the period of the excitation, the critical value for chaotic motions increases as the dissociation energy increases. It is also shown that when the dissociation energy is fixed, the critical value for chaotic motions always increase as the dissociation energy increases for any value of the period of the excitation. Some new dynamical phenomena are presented for this model. Numerical results verify the analytical ones.

Abstract: Based on the modularized conception, the landing and taxiing response analysis system for aircraft with multi-wheels and multi-landing gears was developed. Firstly, the submodels, such as the oil pole model, the buffer model, the tire model and the landing gear model should be built one by one; then, the fuselage model can be assembled by the submodels; finally, the landing and taxiing responses of the aircraft can be calculated under the specified initial conditions. An aircraft model with multi-wheels and multi-landing gears was adopted as an example to verify the feasibility and effectiveness of the software.

Abstract: Human wrist and hand are easy to be injured. Physical rehabilitation therapy after a wrist or hand operation always takes a long time. A CPM machine is a mechanism based on the rehabilitation theory of continuous passive motion (CPM). It is properly applied during the first two stages of stiffness acts to pump blood and edema fluid away from the joint and periarticular tissues. CPM is thus effective in preventing the development of stiffness, if full motion is applied immediately following surgery. This paper shows the state of the art of modern devices used in CPM rehabilitation and, as a conclusion suggests future developments especially focusing the correct methods and exercises for CPM rehabilitation.

Abstract: This research investigates the stress distribution of the three types of implanted femurs using the finite element method analysis. The comparisons of the stress distribution between the implanted femursand the healthy femur were performed and the characteristics in the stress shielding of each casewere clarified. Since the load is transferred on the contact surface between the implant and the inner surface of the femur in the case of the total hip arthroplasty, the stress in the intertrochanteric zone (Gruen zone 7) become very small, and the phenomenon of the stress shielding is confirmed obviously. The stress distributions of the femurs afterthe resurfacing hiparthroplasty and the thrust plate prosthesis are about the same with that of the healthy femur, so, the possibility of the stress shielding is considered lower compared with the femur after the total hip arthroplasty. However, considering the stress concentration thatwill increase the risk of femoral fracture caused by the screws for the fixation of the implant in the thrust plate prosthesis, the resurfacing hiparthroplastymay beconcluded as the best method among these three types of implants to avoid stress shielding.

Abstract: The first three steps of staring action of a superb female athlete, who is in the Short track speed skating teamin Jilin province, were analyzed by Simi motion-Biomechanical Analysis System. Through an Analysis of Parameter by the Theory of Sports Biomechanics, we know the spending time and length of each step of the first three steps. After we compare our local Short Track Speed Skaters with those who are famous in china and the whole world, in the field of Technical characteristics and technical movements of start action, we find that for our local athletes, their consumed time of the first step among the first three steps is more than that spent by excellent Short Track Speed Skating female athletes in Our country and the world, but as for the length, theirs are shorter.

Abstract: The development of robotic devices to apply in the rehabilitation process of human lower limbs is justified by the large number of people with lower limb problems due to stroke and/or accidents. Thus, this paper presents a cable-driven parallel manipulator for lower limb rehabilitation which is composed by a fixed base and a mobile platform that can be connected to one cable at most six and can performing the movement of human gait and the individual movements of the hip, the knee and the ankle. This paper starts with a study of the basic movements of the lower limb. Then the kinetostatic and force analysis were presented. The graphical simulation and experimental tests of the cable-driven parallel structure for lower limb rehabilitation movements are presented showing the viability of the proposed structure.