Applied Mechanics and Materials Vols. 365-366

Abstract: Near-infrared (NIR) spectroscopy combined with the partial least squares (PLS) regression was successfully applied for the rapid quantitative analysis of Zn²⁺ in soil. The models were established using an approach based on randomness and similarity to obtain objective and practical models. Sixty-three samples were randomly selected from a total of 148 samples as the validation set. The remaining 85 samples were used as the modeling set, and it was divided into similar calibration (50 samples) and prediction (35 samples) sets. The results show that the long-NIR region at 1100 nm to 2498 nm could be considered as the information waveband of Zn²⁺ in soil. The optimal number of PLS factors was 10, and the validation root mean square error (V-SEP) and validation correlation coefficients of prediction (V-R_P) were 21.817 mg kg^-1 and 0.849, respectively. The Zn²⁺ prediction values of the validation samples are close to the measured values. The results provided valuable reference for designing the dedicated spectrometers.

Abstract: Near-infrared (NIR) spectroscopy combined with moving window partial least squares (MWPLS) method was successfully applied to the waveband selection for the rapid chemical-free determination of Zn²⁺ in soil. Based on randomness and similarity, an effective approach was performed to obtain objective and practical models. The optimal MWPLS waveband was 1136-1252 nm, and the corresponding optimal number of PLS factors was 6. The validation root mean square error (V-SEP) and validation correlation coefficients (V-R_P) of prediction were 15.658 mg kg^-1 and 0.925, respectively. The Zn²⁺ prediction values of the validation samples are close to the measured values. The results provided a reliable NIR model and can serve as valuable references for designing the dedicated spectroscopic instruments.

Abstract: A mechanical system to detect the static wheel weight of the railway bogie using hydraulic pressure has been designed. Wheel weight can be acquired by a pressure sensor mounted on the hydraulic pressure distributor and displayed by a wheel load indicator with a resolution of 0.1 KN when the hydraulic pressure induced from the hydraulic hand pump lifts a wheel by mechanical components connected with the hydraulic pressure cylinder. The measurable wheel load is 100 KN. Also, a height indicator which is attached on the wheel using a magnet shows the elevated height of the wheel from the rail.

Abstract: Ohm is the basic unit of electric parameter. Its quantity transferable system is achieved by the ohm resistor. The quality of the ohm resistor is directly related to the accuracy and reliability of quantity transmission system. Ohm resistor can be divided into DC resistor and AC resistor to use. With the development of modern electronic technology, the AC resistor attracts more attention. The design and manufacture of AC resistor has always been difficult which involves cross-integration of the mechanics, electromagnetic and material science, the design effect of most products is not ideal. The technical features, design principles and factors in manufacturing are present in this paper for AC resistor manufacture and test units.

Abstract: In this paper, the virtual instrument technology is used in torsional vibration study to create a set of torsional vibration natural frequency detection scheme for rotating machinery which is based on the characteristics of controllable one-way overrunning clutch. Also, a test system that is highly sampling frequency, good accuracy and fast data processing capability is developed. This system consists of high-precision dynamic torque sensor, microprocessor-based high-speed data relay module, IPC-based workbench. Finally, the measured results and the calculated results were compared, and it shows that the measured and the calculated results come very close.

Abstract: The collection of periodic profiles of oceanographic data at specific bites is a critical component of oceanographic monitoring programs. Typically, this type of work is completed by lowering instrumentation from ships but the cost of these operations has often meant that the temporal and spatial coverage of these surveys is less than ideal. As an alternative, moored profilers have been developed but the energy required moving a substantial package up and down a mooring hire can represent a major limitation. A new profiling instrument with Torque balance mechanism is under development. This device is based on a taut single point mid-water mooring system. It incorporates a small, instrumented vertically profiling float attached via an electromechanical cable to a winch integral with the main subsurface flotation. On a pre-set schedule, the instrument float carrying sensors is winched up to the surface. And it can be immediately winched down to a certain depth. To respond to the concern of energy demands, torque balance mechanism has been designed to conserve a substantial portion of the potential energy lost during the ascent phase of each profile and subsequently use this energy to pull the instrument down. Compared with the previous singlepoint layered measurement, it is useful and economica1.

Abstract: It detected the canopy temperature of rice via automated infrared imaging technology in the test under different irrigation condition, taking the Idso empirical model to determine the lower bound equation of the canopy-air temperature differences, and so to get the best period of observing the rice water deficit by the CWSI, in addition the relationship of the CWSI, soil water content and transpiration rate were also analyzed. The preliminary test analysis showed that the CWSI can reflect the rice water stress conditions well.

Abstract: Space robotic systems are expected to play an increasingly important role in future space activities. With continuous growth of demands of control precision and robustness, researches of complex dynamic characteristics for robot joints become the key problem for space manipulators design. In this paper, the main research achievements on dynamics modeling for joints with harmonic drives are reviewed, and future studies are recommended. Firstly, we summarize the application status of joints with harmonic drives in space robotic systems. Secondly, dynamic characteristics of joint in space environment are discussed. Then, the advances in joint modeling, including compliance, transmission friction and hysteresis, are introduced. Moreover, identification methods and relevant research works are reviewed. Finally, the future research trends are forecasted.

Abstract: The national grid power robotics laboratory has developed four generations of substation inspection robot, through the non-contact infrared acquisition equipment ReTu, image and audio information, automatic identification equipment heat defect, abnormal appearance, to staff send alarm information, and provide the basis for the equipment state inspection data. Robot modelling design especially industrial era, is an important attribute of the robot, this paper is the inspection robot for substation humanoid design important discussion, through the modern industrial design method.

Abstract: To manufacture three-dimensional textile composite preform using method of unilateral suture technique, a unilateral suture manipulator system has been designed. In order to inspect whether it can meet the design requirements , this article establish the kinematic model of the major institutions by using vector method,and use simulation software to analysis the kinematics of thread-leading, thread-hooking and thead-taking-up mechanism. Accordingly, law of motion graphs of the mechanism can be reflected, and the simulation results demonstrate the design of unilateral suture manipulator which are reasonable and efficient.