Applied Mechanics and Materials Vols. 397-400

Abstract: In order to improve the seeding quality of paddy planter, some parts of rice seed-metering, such as sufficient regulator and delivery tube, were optimally designed, and field experiment was completed to optimize the structural and working parameters. Central composite design was employed to as design the experimental plan by means of the Design-Expert software (Version 7.0). The parameters of travel speed (A), sufficient regulator’s angle (B) and length of delivery tube (C) were selected as influence factors, and seeding quality rate(y₁), damage ratio of seeding(y₂) and ratio of seeding holes(y₃) were chosen as objective indexes. Regression models were established and analyzed based on Design-Expert and SAS software. The experiment results indicated that sufficient regulator improved quality of seeding and ratio of seeding holes especially with a few rice seeds in seed room. Under experimental conditions, the importance of each variable on y₁, y₂ and y₃ was A>C>B, C>B>A and C>B>A and effects of the interaction of A and C on y₁, the interaction of B and C on y₂ and the interaction of A and C on y₃ were significant by response surface analysis. By multiple objective programming, the optimal parameters were obtained as follow: travel speed of 2.8km/h, angle of sufficient regulator of 72°and delivery tube’s length of 0.25m. This study has important significant to well improvement seeding quality of rice direct-seeding.

Abstract: This paper proposes a product module division method based on BOM and degree of modularity. First, based on BOM, the product structure tree is formed by taking spare parts as nodes, and the incidence matrix and correlation diagram are obtained by analyzing a variety of correlation of the nodes. Then, it proposes the definition of the degree of modularity, minimum value and mean value of the optimal degree of modularity are selected to determine the division of the modules. Finally, the working unit of the wheel loader are taken as an example to describe the reasonableness and effectiveness of this method.

Abstract: The phenomenal growth in three-dimensional printing technology has the potential of ushering in the next wave of industrial revolution. As part of an advanced project design conducted at the Aerospace Engineering of the University of New South, the concept of a printable unmanned aerial vehicle was explored. A subsequent small scale test model was manufactured using three-dimensional printing technology for wind tunnel testing and validation. The exercise demonstrates the huge potential of such printing technology in future aircraft designs. Key words: 3D printing, design, manufacture, UAV

Abstract: This research proposes a novel wireless RFID-based thermal convection inclinometer. Five new ideas are presented. The first one is to make it on a flexible substrate to save more energy than the traditional silicon. The second one is to integrate both an inclinometer and a wireless RFID antenna on the same substrate, such that it becomes a wireless sensor and very convenient for usage. The third idea is to apply the hemi-cylindrical chamber instead of the previous rectangular one, so the gas distribution is more streamlined to increase the sensitivity. The fourth idea is to use a non-floating structure instead of the floating one, thus it is more simple and low cost without making a cavity in the substrate. The fifth idea is to apply stacking material for the temperature sensors, so that the sensitivities are not only larger, but the curves are more linear. Three kinds of stacking height were studied, such as 1, 1.5 and 2mm. Moreover, three types of material with different thermal conductivity are also tested, such as alumina nitride (AlN), copper and silicon. If the chamber is filled with the traditional carbon dioxide, one can see the combination of AlN/2mm is better, and the maximal linear operating range and sensitivity are 75° and 0.107°C/Degree, respectively.

Abstract: Improving the driving range and driving performance are critical for pure electric vehicles (EV). Transmission ratios directly affects drivability and economy of EV. This paper analyzed the impact of various transmission ratios on the performance of EV, verified the vehicle performance with different transmission ratios by simulation with models built with GT-drive software, and based on EV performance requests, optimized the EV transmission ratios, presents single reduction gear and multi-speed transmission ratio scheme respectively, compared the EV performance with these two transmission schemes respectively, simulation results show that multi-speed transmission system can improve the performance of electric vehicle on dynamic and economy.

Abstract: White light scanner plays a vital role in reverse engineering. It has penetrated into all industries. It includes cars, grinding, aircraft, and mobile phone industry and so on. The paper introduces the basic principle of white light scanner and the measurement techniques.

Abstract: Temperature is an important parameter representing the motor operating conditions. Temperature monitoring data are time series data, which have strong correlations in time. From the perspective of mathematical statistics, these correlations of time series were analyzed using EViews6.0 software in this paper. Through the establishment of ARIMA model, the motor shell temperature time series was predicted.The final prediction model is ARIMA(1,1,2). Simulation shows that ARIMA model has high predict precision and can be used to predict the temperature of motor shell, which can help to detect equipment failures, avoiding the losses caused by motor faults.

Abstract: In order to construct a swarm to accomplish the future space missions, e.g., space exploration, which will be unmanned and necessarily highly autonomous, some enable technologies should be first investigated deeply, such as deployment optimization, inter satellite link and collide avoidance. In this paper, an optimal model of deployment for satellite platforms is presented firstly, which is indeed an intrinsic multi-objective optimization model. Secondly, an inter satellite link based on free-space optical communication is designed to accomplish the information exchange among the notes in swarm. Thirdly, an effective collide avoidance strategy using potential function is put forward to reduce the lost of swarm notes during moving to the target location. With the technologies previously mentioned, swarm will exhibit the properties of self-protecting, self-healing, self-configuring, and self-optimizing compared with traditional large-size satellite. This work affords a strategy to achieve the concept mission, swarm-based space mission.

Abstract: A model identification scheme based on the action dependent adaptive critic design (ADACD) is proposed for MIMO discrete nonlinear system. This scheme first introduces a critic network to approximate the overall identification evaluation of the system and then adjust the parameters of the identification network (i.e. action network) to minimize the output of the critic network. The system is proved to be uniformly ultimately bounded by using Lyapunov method. Furthermore, the weights of the critic and identification networks are also guaranteed to be bounded.

Abstract: In order to improve anti-jamming capability and transmission efficiency of the inductive setter, a structured approach to construct several low density parity check(LDPC) codes is used in this paper. The LDPC codes have different error-correcting capability, and can timely correct BER which are generated during the transmission of channel. The simulation analysis show that the LDPC codes can effectively avoid retransmission of the codeword, and raise the Induction Setter anti-jamming capability and transmission efficiency. The method of LDPC codes used in the inductive setting can ensure the control information efficiently load to the fuse.