Advanced Materials Research Vols. 468-471

Abstract: By applying the principle of the closed tube, pressure measurement and ultrasonic water level measurement instruments, a kind of mobile and unfixed zero point water level meter system was introduced and designed in this paper to overcome the deficiency of its difficulty in measuring the arbitrary point water level by the currently fixed water level meters. The mobile water level meter system can measure arbitrary point water level precisely and rapidly in a certain range. Experiment testing has already shown the feasibility of the developed water level meter system with the characteristics of light and handy, easy fabrication and learning and can thus be widely used in the study of hydraulic model and physical model experiments.

Abstract: This paper presents adaptive control rules, in the dynamics level, for the nonholonomic mobile robots. Adaptive controls are derived for mobile robots, using Lyapunov stability technique, for tracking a reference trajectory and stability to a fixed posture. The presented control law can render system asymptotically stabilization at a desired target. The simulation shows it has good position tracking performance. This template explains and demonstrates how to prepare your camera-ready paper for Trans Tech Publications. The best is to read these instructions and follow the outline of this text.

Abstract: In the paper,we establish mathematics model of analysis and evaluation about NBA match. On the foundation of total error definition, according to actual fact, in the same area, for the sake of better reflection each ball team is stronger or weaker than other ball team in same area, we compute relative victory’s rate, and get coefficient of profit and loss, thus it makes us get a target value what can better body equity of each ball team about arrangement of match . In the model, we design zero or one programming model according to error definition .In the model,we find the method which two ball teams games are three games among same part and dissimilarity area.We get coefficient of profit and loss with matlab software ,the superior value of the east or the west,and arrangement of matchs about two ball teams with three games mutually.

Abstract: Nitrogen is a crucial parameter in maintaining crop health and predicting crop yield. It is possible that leaf nitrogen concentration (LNC) was quickly and non-destructively estimated by remote sensing method. The objective of this experiment was to develop a sensitive spectral index for monitoring LNC in wheat based on HJ-CCD data. In this study, we assessed several common spectral indices based on stepwise regression methods with the determination coefficient (R2) and root mean square error (RMSE). The results indicated that compared to other spectral index, the spectral index of 1.65SIPI-1.35PSRI was the most positively related to LNC (R2 = 0.6328, p<0.01), and the model for monitoring LNC based on 1.65SIPI-1.35PSRI was with the RMSE of 0.685 g.m-2 (p<0.01), and was significantly better than the models adopting other spectral indices. In conclusion, this study confirmed the feasibility of utilizing 1.65SIPI-1.35PSRI derived from airborne remotely sensed data to monitor LNC in wheat.

Abstract: According to the request of the facility agriculture, the parameters acquisition system is designed, into which the temperature, humidity, CO₂ concentration and illumination have been integrated. The light source control system for adjusting LED spectrum is designed together with relation of the plants and LED optic character, used as the supplementary lighting source of plant environment. The monitoring system replaces of traditional manual monitoring mode, so the automation has been improved greatly. Based on the different plants, different LED spectrum is employed to irradiate the plants, which is benefit to the plant growth. Experiments show that whole system works stably, temperature error is ±2.4%, humidity error is ±3.1%, CO₂ concentration error is ±0.7%, illumination error is ±1.9%, and the LED spectrum can be adjusted in 255 grades automatically or manually.

Abstract: In the measurement process of the large, complex surface, due to the errors of the installation, the errors of the machine bed itself and other factors, the probe can be over pressed. The situation of measuring interruption can be occurred. In the paper, take the measurement of the spiral bevel gear for example, by using of the gear meshing theory and differential geometry, through a series of coordinate transformations, the coordinates of the tooth surface grid nodes are calculated. Through measuring the tooth surface of the spiral bevel gear by using of Gear Measuring Center(GMC) and 3D scanning probe system, the follow-up control strategy of continuous scanning measurement based on the constant measuring force was proposed. The measurement and evaluation of the tooth surface were achieved through continuous scanning motion along the measurement path planned. In the measurement process, the measurement path was planned according to the theoretical models. The offset values of the probe were real-time detected, the constant deformation of the probe was ensured through controlling the motion of X,Y,Z axes. The mathematical model of the relationship between the velocity of each axis and the deformation vector of the probe was established. The continuous scanning measurement along the path planned based on the constant measuring force can be implemented. The requirement of the steady-state errors and real-time were meted by using of PID control strategy of subsection variable parameters. The method was finally simulated and experimented. The results showed that the occurrence of unexpected interruption in the measuring process can be effectively solved. It plays an important role for the highly-efficient and highly-precise measurements of the tooth surface.

Abstract: High force amplification in micro-scale can be achieved by MEMS compliant systems and such systems have been recently preferred to obtain high output forces in micro actuators due to its monolithic structure and ease of fabrication. We studied the mechanism of novel MEMS force amplifier in dynamic mode by modeling its rigid body mechanism with Matlab/Simulink programming. Kinematic analysis and dynamic response of the MEMS compliant system was obtained by modeling of velocity and acceleration parameters, and ramp input function, respectively. We found that the output force goes to infinity at zero-crank angle and there is 2650 times force amplification by a given very small crank rotation about 2.30.

Abstract: Torque measurement of transmission shaft has problems such as signal transmission, limited installation space and signal disturbance. In this paper proposes an embedded capacitive grid torque sensor. Through a special installation the output of capacitive grid sensor is proportional to twist angle, then torque can be calculated. The two electrodes of capacitive grid sensor can be embedded into the bearing and shaft respectively that reduces installation space, to improve the testability of transmission shaft. Experiments show that capacitive grid sensor performs high reliability and is able to be used in the case of strict environmental requirements in long time.

Abstract: The creative thinking of the pressure -continuously-regulating device based on a NC rotary valve is introduced. Its inner structure, operating principle and technical feature are given out. The equation that gas flow and pressure changed with the rotation angle of the valve core is provided too. Stepper motor is used as its actuating device in this creative pressure -continuously-regulating device whose basic component is the specially designed, such as valve body, valve core and some common connections. Orifice area is changed by rotating the valve core controlled with a PC-controlled stepper motor which, and then an accurate adjustment of flow rate is thus ensured. As the change of the rotation angle is continuous, the flow rate also changes continuously, so the change of the pressure must be continuous.

Abstract: As the grain size of nano ceramic has reached nanometer grade, it possesses high hardness, high wear resistance and high toughness. Therefore, the scalpel made by nano ceramic has the virtue of high wear resistance, good corrosion resistance, long service life, non-toxic, non-static, sharp edge and so on, but the processing of this kind of scalpel is extremely difficult. This paper prepares the nano-ceramic scalpel by using ELID grinding technology, and also studies the thickness, surface roughness, edge sharpness of scalpel. The research results show that the thickness of prepared scalpel is 0.3 mm, the surface roughness is 6-60 nm and the edge radius is 200 nm, the cutting experiment on suture shows that this scalpel can meet the requirements of international standard for medical scalpel when the cutting force is less than 0.8 N. This further proves that the ELID grinding technology is suitable for the preparation of nano-ceramic scalpel. The preparation technology and technological equipment of nano-ceramic scalpel are proposed on the basis of above achievements, and this technology possesses promising application prospect.