Advanced Materials Research Vols. 538-541

Abstract: 3D ink-jet printing is regarded as the ideal manufacturing technology for Heterogeneous Object(HO) materials, but this technology is much restricted by the high requirement on idealized materials, high forming cost and imperfect modeling and layering technology for HO. To solve these problems, a virtual 3D ink-jet printing system for simulation of HO fabrication is developed in this paper. Since the physical model is replaced by the digital model, the potential risk will be avoided effectively and it will result in higher product quality and much lower manufacturing cost. Finally, examples of the virtual formed prototypes are given.

Abstract: This paper presents a parallel control method for the structural dynamic topology optimization problem. The necessary and feasibility of parallel control during the optimization iteration process were discussed, respectively. The parallel control algorithm based on traditional sequential programming method was constructed by introducing MMA. The method proposed in this paper can improve the drawback of low computational efficiency and local convergence in FEA, which has been illustrated in the results discussion section in the end of the paper.

Abstract: In order to improve low-speed flexibility and high-speed handling and stability of multi-axle vehicle, a double-phase steering system was designed with planetary gear system. An in-phase steering mode is used when steering wheel turning in small angle. A adverse-phase steering mode is used when steering wheel turning in large angle. A five-axle vehicle simulation model was established with software ADAMS/VIEW. The research of all-wheel steering and non-all-wheel steering for high speed and low speed was respectively processed. When running in high speed, the lateral acceleration and yaw rate of the centroid are significantly lower when rear wheels steering in in-phase mode than the rear wheels not turning, which makes the possibility of roll and drift decrease, when vehicle overtaking in high-speed. When running in low speed, compared with rear wheels not steering, when rear wheels sreering, lateral acceleration increased by only 12.8%, yaw rate is 17.3% higher, diameter of the centroid trajectory is reduced by 12.9%, which greatly increases the mobility and flexibility of the multi-axle vehicle when turning at low speed.

Abstract: Aiming to the production processes which require two kinds of restoration procedures, this paper describes charts with two pairs of control limits. Different restoration procedures depend on where a sample mean is. We study the positions of these control limits and statistical properties of these charts. The conclusion is that these charts have the same average run length as the traditional Shewhart charts for in-control process or out-of-control process. However they can distinguish between the big shift sizes and the small shift sizes of the process mean effectively.

Abstract: To reduce the miss distance of flight test missile, the midcourse guidance law is studied in this paper. The nonlinear projectile dynamic model is developed at first, and then designed the midcourse guidance law with the impact point prediction information. The guidance law was designed using the difference between predicting impact point and target point. To improve the guidance law’s performance, this research inducted the predicted impact point’s velocity information and integral term into guidance law command. At the end, the simulation was developed. The results of simulation show that the guidance law designed in this study is successful and it can satisfy the test missile’s flight mission requirements.

Abstract: Mechanical systems is vulnerable to be influenced of its structure and human factors for its subsystems, components and the complex relationship between each unit, causing the mechanical systems to be failed, which severely affects the reliability of the mechanical systems. based on Petri nets models of mechanical systems analysis, from safety, intermediate and failure three aspects, 3-level working model of “safety-intermediate-failure” is introduced to reflect the reliability (functioning fully) of mechanical systems, intermediary transition between reliable and failure, failure (can not work). Through using the union and intersection operation of stochastic event, and considering the different values of the related failure parameters among basic events which impacts on the reliability of mechanical system, eventually the calculation of mechanical system reliability vector with the intermediate state is established.

Abstract: Through measurement the sizes of the head and neck at all kinds of activity state was obtained. It was analyzed to get the parameters of the structure of hood, such as the length and the width of hood, which accord with the movement of the head and neck. According to the parameters, two-piece hood was drafted. By comparison and analysis with human body data, it can be drawn the two-piece hood is not good in fitness and aesthetics and three-piece hood is more fitted structure. The width of the middle piece has a big effect on structure of the three-piece hood. A mathematical model about the relationship between the width of the middle piece with the head circumference and hood length can be got with the multiple linear regression in SPSS, so that the optimal three-piece hood can be got just with head circumference and hood length.

Abstract: This research is to integrate the QFD and TRIZ theories into innovative principles of the intelligent patient bed design processes. The use of the QFD matrix expansion and its importance for the evaluation and analysis to build the front-end preventive design process will meet customer needs. The evaluation is based on the order of importance; the quality characteristics of the target specifications and quality characteristics of the correlation matrix. The design of an integrated sensor system to monitor patients‟ body movements while lying on beds enables the data quantity to be collected and analyzed to identify the cause of bed sores and the spots that bed sores are prone to occur. Armed with this information, designers and engineers can work to develop much-improved and market competitive products, which is the focal point of this article. Doctors can then treat patients more efficiently and effectively. All physical response data derived from the patients (testers) are documented to assess the correlations between the sensors and the human body. During the test time, the mechanism was activated, and all of which were able to effectively facilitate the reduction of bed sores for the patient by the intelligent patient bed.

Abstract: In view of well- designed treadmill is advantageous to healthy, the author analyzes the design problem of the existing treadmill which exists in using function, art function and material technique function and others, discusses the shape design, the color design and the components design. Among them t the components design mainly elaborate the bottom frame design, the handrail design and other designs. Then the possibility is analyzed. On this foundation, the design practice of new type treadmill is done.

Abstract: This paper completes the camshaft optimization design of curve by digital modeling and simulating of the engine using the GT-POWER and Flow simulation; and realizes the reform of the combustion chamber and the regulation of compress ratio, and successfully verify the work feasibility which is full use the power stroke for the top two stroke engine exhaust and the effect of energy saving and emission reduction by using this method that the reform of and combustion chamber replaceable piston top experiment method, on the piston top to have specific shape and quantitative embedded in the size of the piston top. And it explores a set of method that can make machining camshaft quickly and accurately, and reduces the time and the cost of the CAM processing effectively.