Advanced Materials Research Vol. 740

Abstract: The mechatronic elevator system driven by a permanent magnet synchronous motor (PMSM) is modeled by both the mechanical and electrical equations. The dimensionless forms are also derived for the purpose of practicable movements. In this paper, the minimum-input energy trajectory (MIET) and minimum control effort trajectory (MCET) based on Hamiltonian function and the five-degree (5-D) normalized polynomial trajectory are designed and compared. From the numerical simulations comparisons; it is found that the MIET has the minimum input absolute electrical energy (IAEE).

Abstract: Problems of practical educational process in mechatronics and automation appeared last time because of avalanche-like growth of information stream in the field lead to necessity to renovate concepts of laboratory base in educational activity. The paper considers modern approaches to practical training course realized in Novosibirsk State Technical University (Russia).

Abstract: Combined with vehicle map location surveillance applications, this paper presents a realization method of the map object pool based on the analysis of the basic principles of object pool technology. The test results by LoadRunner show that its reasonable to use the map object pool and it greatly enhances the real-time data processing performance of system map.

Abstract: The rule of Fire bore pressure and the maximum bore pressure point are very important problems in interior ballistics. This paper analyzed the characteristics of the bore pressure by an improved BP neural network, furthermore predicted the maximum bore pressure by the net-work well trained above. First, an improved three-layer BP neural network were established ,and trained by low frequency (20kHz) pressure data, and then several high frequency (50kHz,100kHz,200kHz) pressure data were fitted by the same network, furthermore the maximum bore pressure and the time of the maximum bore pressure were predicted by the network. Compared with the actual measured data, it was shown that this method also applied to the high frequency pressure data, and had a high fitting accuracy and prediction accurate. Above all, it proved the method is feasible and generic, can be applied to related dynamics problems, and has a value for application.

Abstract: In order to simulate the multi-sensor signals of the train integrated positioning system, and make signal fusion and verification, the train integrated positioning signal simulation system is introduced in this paper, which is based on GNSS and multi-sensor integrated positioning thoughts, the mathematical models and failure characteristics of the sensors are analyzed, the pulse speed sensor and gyro error models are established, the data simulation approach and data acquisition modules are adopted to simulate pulse speed sensor and gyroscope signals, the GNSS simulator is used to simulate GNSS signal under different scenes and conditions, signal fusion algorithms are used to conduct fusion and filtering of the integrated positioning signal. The results show the availability of the simulated signals. The train integrated positioning signal simulation system provides test environments with the parameters controllable, and lays a good foundation for the researches of the Beidou based integrated positioning system and the multi-mode satellite positioning technology.

Abstract: Bone drilling and cutting manipulations are widespread in the orthopedic surgery. In free hand performance of them some errors such as an inaccurate penetration and dilate of bone hole, overheating, harm soft tissues could be occurring. The goal of this study is to design and develop control concept for a bone drilling and cutting robotized system. The proposed orthopedic system consists of two executive modules for drilling and cutting and common control panel. The control algorithms and programs for drilling have done and given in the paper. We are developing the control algorithms for cutting manipulation.

Abstract: In this work, we study experimentally the effect of the geometry parameters of saw-tooth surface and micro-part on the motion of micro-parts. The experiments are performed for a range of saw-tooth pitch, p, micro-part length, l, and exciting frequency applied to the surface, f. By the use of particle tracking velocimetry method, we can achieve time-dependent velocity, and then ensemble-averaged velocity of the micro-parts. The results show that for different l and p but the same relative scale l/p, the profiles of micro-part velocity against the characteristic surface velocity pf are similar. However, they shift along pf axis depending on p. Furthermore, the profiles are the similar for the relative scale l/p of 4 to 100. It seems that the motion of micro-part depends on characteristic surface velocity pf than the relative scale l/p for l/p larger than a certain value.

Abstract: This paper proposes a real-time coplanar Non-Uniform Rational B-Spline (NURBS) curves fitting in CAD/CAM system to improve the fitting quality and reduce the calculation effort. The real-time NURBS curve fitting process consists of (1) the reading discrete points, (2) curve segmentation and data reshaping, (3) curve fitting, and (4) local and global modulation. According to the simulation and experimental results, the proposed approach certainly raises the fitting quality and the efficiency of calculation.

Abstract: The main purpose of this paper is to create an efficient ground-sweeping robot equipped with map-establishing and path-planning functions. Two ground-sweeping robots are connected with a master pc via a Blue-tooth protocol. The position of the ground-sweeping robot will be sent back to the master pc allowing the master pc to control the robots during the ground-sweeping process. An environmental map of the sweeping area will be established by emitting an ultrasonic wave from a rotating ultrasonic sensor within the robot. The geometry data will be sent back to the master pc via the Bluetooth module. The map of sweeping area will be made by the master pc using a wall-searching method. A single-chip Microcontroller PIC18F4520 is used as a control core to control the motor speed via the PWM in the robot. The clockwise and counter clockwise rotation of the motor will then be manipulated by a TA7279 IC. The robot is equipped with two ultrasonic modules used to detect the distance between the robot and the obstacle. This information will be sent back to the master pc via the Blue-tooth module. Consequently, results reveal that a prototype of the swarm robot system using two ground-sweeping robots and a master pc has positioning and mapping abilities.

Abstract: To assure product quality, an early warning and inspection system to predict the variation (trend) of a products quality (i.e. the product thickness) in the manufacturing process is necessary. Here, a manual online measurement of a production line installed with an online automatic warning system that will prevent manually accumulated errors from occurring is presented. Using this system, a quality trend profile will be made. The abnormal trend distribution will be obtained by randomly selecting the period of the quality trend profile and translating it into a time distribution bar chart. The monitoring online system will be pre-warned via the abnormal trend distribution. A products thickness can be obtained using a linear variable differential transformer (LVDT). The analogue signal will be transmitted to the AD converter of the PLCs analogue input channel. The digital signal will be transmitted from the series port to the remote PC via the web control unit. A profile of the products thickness measured by the LVDT will be monitored online and dynamically exhibited in the web-based remote system by using an embedded Javascript, an HTML, and a web control unit. The upper/lower thresholds will be preset in the product thickness profile. In addition, the quality monitoring system will be pre-warned via the time distribution bar chart when the abnormal trend distribution occurs. Consequently, the web-base monitoring system can be extended to remotely connect to all the LVDT devices.