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Ding S.,Lanzhou University of Technology | Ding S.,Key Laboratory of Gansu Advanced Control for Industrial Processes
Advanced Science Letters | Year: 2012

Ultrasonic wave propagation velocity depends on the liquid downstream or upstream. In the same distance, the ultrasonic propagation time is different. The propagation time difference and the measured fluid flow rate are associated. The article studied the time difference method, and obtained the time difference, and it would calculate the fluid flow meter in the pipe. The error sources and error reducing methods were deeply analyzed, and it realized high-precision measurement of liquid flow. The AT89C51 microcontroller ultrasonic flow meter device has a low cost, high speed, high precision, reliability, adaptability advantages. © 2012 American Scientific Publishers. All rights reserved. Source


Zhou Y.,Lanzhou University of Technology | Li S.,Lanzhou University of Technology | Zhou Y.,Key Laboratory of Gansu Advanced Control for Industrial Processes
Journal of Theoretical and Applied Information Technology | Year: 2012

In this paper, we study the performance of the classical SW-ARQ, multichannel SW-ARQ and GBN-ARQ in discrete-time Geom./G/1 queue with setup mechanism. Based on the method of embedded Markov chain, the expressions of the packet average waiting delay, system average delay and channel utilization are respectively obtained. Finally, by numerical examples, we analyze the influences of packet length, the successful transmission probability and packet arrival rate on system average delay. The numerical simulation results show that the system delay could be lower by choosing an appropriate ARQ protocol. © 2005 - 2012 JATIT & LLS. Source


Li E.C.,Lanzhou University of Technology | Li Z.M.,Key Laboratory of Gansu Advanced Control for Industrial Processes
Advanced Materials Research | Year: 2011

Surface tracking with robot force control for position-controlled robotic manipulator is proposed. A neural network is applied to classify the unknown environment based on its dynamic response of the environment, on-line force feedback data are employed to estimate the normal and tangential directions of the unknown environment, the estimated vectors are used to generate the reference trajectory for the target impedance model. Real-time calculates the curvature of curve to be tracked to adjust the speed of the tangential direction, the reference scaling factor is determined by fuzzy reasoning according to current and forecast contact force, in order to adapt the reference trajectory generated for the changeable environmental parameters and control parameters. Simulation is conducted to verify its force tracking capability. © 2011 Trans Tech Publications. Source


Du X.,Lanzhou University of Technology | Hao X.,Key Laboratory of Gansu Advanced Control for Industrial Processes
Lecture Notes in Electrical Engineering | Year: 2012

International Water Association (IWA) and the European Co-operation in the field of Scientific and Technical Research (COST) Action 682/624 develop the activated sludge wastewater treatment Benchmark Simulation Model No. 1 (BSM1), the main purpose is to establish an activated sludge process (ASP) control program development platform. This paper detailed describes how to use Matlab M-files to establish BSM1, and then gives out the results of the model simulation. © Springer-Verlag Berlin Heidelberg 2012. Source


Ding S.,Lanzhou University of Technology | Ding S.,Key Laboratory of Gansu Advanced Control for Industrial Processes | Li W.,Lanzhou University of Technology
Key Engineering Materials | Year: 2011

In a variety of materials, the ultrasonic propagation velocity is different. Using ultrasonic reflection principle in the material, the measuring instrument detected the thickness of the measured object. AT89C51 microcontroller as the system core, with ultrasonic probe, transmitter circuit, receiver circuit, counter circuit, LCD display circuit together, completed the measurement of materials thickness. The measurement range was up to a 1.2 ∼ 200mm. Practice shows that the instrument is low cost, high speed, high precision, reliability, adaptability, etc. So it has broad application prospects. © (2011) Trans Tech Publications, Switzerland. Source

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