Advanced Materials Research Vol. 411

Abstract: Short arc usually lost the most part of information in measurement, therefore the fitting center can not be found accurately. The shortage of least-square method is analyzed in short arc fitting. The uncertainty of fitting center direction and fitting radius is illustrated. And we derived the solution to estimation of fitting center direction. Base on the testing environment, radius constraint least-square fitting circle method is proposed. Simulations demonstrated excellent performance of this algorithm.

Abstract: The mass sensitivity of a piezoelectric diaphragm biosensor has been investigated. The piezoelectric diaphragm utilizing a flexural vibration mode is an acoustic wave device which can be immobilized with a bio-molecular recognition layer on its surface. The mass sensitivity of the sensor was analyzed by the approximately theoretical and FEM methods, respectively. The sensitivity formula expressed by the structural parameters and the material parameter was educed for easy computing. The procedure utilizing Rayleigh method for the analytic solution of the sensitivity was introduced. The expression was verified by using a commercial FEM software package, ANSYS. The simulations are well consistent with the theory.

Abstract: According to the relation of inertia moment and electromechanical time constant, dynamic structure and inertia moment of double loop DC motor control system is proposed. The effect of the moment of inertia on the dynamic response process of the double-loop DC control system is analyzed. In addition, the mathematical relation of the inertia moment and the rotation acceleration for the double-loop DC control system is discussed. Lastly, the effectiveness of the mathematical relation is verified through the experiment of the actual system.

Abstract: To optimizing efficiently control parameters in feed servo system for adequately giving out the CNC machine tools, the velocity loop control model is built, and the comprehensive evaluation function is given. The standard particle swarm algorithm is improved to optimizing the parameters of velocity loop control in CNC machine tools. It shows the best overall performance of the velocity loop in CNC machine tools that parameters optimized by improved particle swarm algorithm Compared with genetic algorithm, the standard particle swarm algorithm and handy calculation. This optimized algorithm is a new efficient ways to solve parameter optimization of CNC servo control system.

Abstract: This paper describes an interpolation algorithm in the multi-axis motion control system, which can achieve six-axis interpolation operations, greatly improving the processing efficiency. Using modular design idea on the Quartus II platform, by DDA interpolation theory, interpolation modules are built through VHDL. And these interpolator modules are connected into schematic diagrams. By those schematic diagrams a linear interpolator, a circular interpolator and a composite interpolator are formed. The corresponding functions of those interpolators have been simulated on the Quartus II platform. The simulation shows that this interpolation algorithm is effective to complex multi-axis motion control system.

Abstract: Real-time control method about all software CNC based on Windows was proposed in the paper, and the data transfer methods were given. The determination method of clock interrupt about software CNC and the enhancement of the interrupt level were given in the paper to meet the needs of the speed control and the interpolation operator. The resolves showed that the speed of the whole software CNC was significantly improved.

Abstract: The performance tests and the requirements of experiments on aircraft alighting gear actuating cylinder in the salt spray and hot and humid environment are presented in this paper, and the hydraulic system of experimental device is designed. The host computer software is developed by Lab Windows/CVI for actuating cylinder on test parameters settings, monitoring, and storage and record, The Siemens PLC are used at the sub-processors to control the salt spray experimental device. The field-test shows that the device control precision is higher to pressure, flow rate, and the parameters such as temperature, and it can realize the simulation for different salt spray and hot and humid environments. The test on aircraft landing gear by using actuating cylinder has a good human-computer interaction and communication function. The device is safe, reliable and it can reach the test requirements.

Abstract: Laminar Cooling is an indispensable part of hot strip steel mill. Based on the devices, instruments and control requirements of 1150mm hot strip steel mill in a certain actual Iron & Steel Co., the laminar cooling control system is designed, including hardware figuration, network framework, software functions, mathematical model, etc. The engineering practice proves that the control system is steady and reliable, and it has the value being popularized in the other similar production line.

Abstract: The precision of micromanipulator is affected by the characteristic of compliant spring. With consideration of nonlinearity and large deformation, the dynamic equation of compliant spring based on principle of Bernoulli-Euler equation and pseudo rigid body model are proposed in this paper. The relationships among property of load, displacement, curvature etc and geometrical parameter are analyzed. The stress equation of compliant spring is established. Experiments show that this model is correct and can be used to design precise micromanipulators efficiently.

Abstract: We focus on the design of an intelligent tracing car controller based on analog circuits. In this work, detectors, processing unit and driver module are acted as the Infrared tube, LM393 and the switch of transistor circuit respectively. The voltage comparison and filtering are finished after analyzing and processing the track information acquired. And the signal controls the driver circuit action. Therefore the intelligent tracking process was realized. The physical test results show that the design is simple, stable working and good following mark ability.