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检索条件"机构=Key Laboratory for Control Theory and Applications in Complicated Systems"

共 933 条记录，以下是901-910 订阅

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Iterative estimation of phase distribution on reference planes in grating projection profilometry

Iterative estimation of phase distribution on reference plan...

引用

4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment

作者： Zhang, Xiaoling Zhang, Baofeng Lin, Yuchi Liu, Dongmei Li, Xiaofei Key Laboratory for Control Theory and Applications in Complicated Systems Tianjin University of Technology Tianjin China State Key Laboratory of Precision Measuring Technology and Instruments Tianjin University Tianjin China

ISBN: (纸本)9780819475435

The unwrapped phase distribution on reference planes with different heights in grating project profilometry are analyzed and synthesized. Then a two-parameter second-order rational polynomial to express the uneven phases on every plane is proposed. A first-order Taylor series expansion is employed to obtain the polynomial coefficients of rational polynomial based on least-square iterative estimation method. By this method, phases on all the reference planes are retrieved precisely and extended to the full field. The results of experiences proved that the method not only can retrieve the phases distribution on the full field from parts reference planes, but geometrical parameter error, real reference plane profile error and random error are decreased, and coordinate measuring precision is also increased. © 2009 SPIE.

关键词： Profilometry

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Study on fiber bragg grating displacement sensing

Study on fiber bragg grating displacement sensing

引用

International Symposium on Photoelectronic Detection and Imaging 2009: Material and Device Technology for Sensors

作者： Li, Li Ge, Chun-Feng College of Precision Instrument and Opto-Electronics Engineering Tianjin University Tianjin 300072 China Tianjin Key Laboratory for Control Theory and Applications in Complicated Systems Tianjin University of Technology Tianjin 300191 China

ISBN: (纸本)9780819476623

The paper proposes a novel demodulation method of fiber grating displacement sensing with applying dual grating structure. The linear tuning sensitive structure of isosceles triangle-shaped cantilever beam is designed which can be used to eliminate the influence from environmental temperature. The fiber grating is pasted in the cantilever top and under both sides. When the cantilever free end take place the displacement, this would generate strain which can make the gratings compression and tensile respectively, furthermore, cause the changes of bragg grating reflection wavelength. The changes of grating is caused by temperature influence in the same direction, and caused by stress change in the opposite direction. Therefore, the change of optical power caused by temperature was offset, that is, eliminate the influence from environmental temperature. When the free end has displacement or load, the grating on beam top surface was stretched, bragg wavelength drift to the long-wave direction, and the grating under the surface is compressed, which make wavelength drift to the short-wave direction. The changes of light intensity can be seen from the spectrogram. Using linear tuning properties without chirped of cantilever beam, micro-displacement in the free end can effective turned into the strain of equal intensity beam. The changes of bragg wavelength caused by strain can be shown in optical power meter, and would be transformed into voltage display through demodulation system. Therefore, displacement sensing information is derived indirect;the optical measurement of micro-displacement is realized. The experiment result shows the system sensitivity is 0.87mV/μm, and displacement resolution is 2.12nm/mm. © 2009 SPIE.

关键词： Fiber Bragg gratings

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Discrete chaotic synchronization and secure communication design

Discrete chaotic synchronization and secure communication de...

引用

5th International Conference on Natural Computation, ICNC 2009

作者： He, Hong Wu, Yi Zhang, Baofeng Zhang, Dajian Tian, Yong Wang, Kexi Meng, Hui Hou, Mingfeng Tianjin University of Technology Tianjin Key Laboratory for Control Theory and Application in Complicated Systems Tianjin 300191 China Research Institute of Measure Technology Tianjin 300192 China

ISBN: (纸本)9780769537368

In resent years, secure communication is becoming one of the researching hotspots in information safety. Some problems of chaotic synchronization and its application in communication are studied on the bases of the theory of nonlinear dynamics. It is a mode of correspondence, which transmits the desired information in the channel by means of encrypting, and then decrypts them at the receiving end. Chaos encryption is to encrypt the plaintexts and utilize random-like characteristics of chaos signal to secure the real-time communication. This paper bases on nonlinear dynamics theory and Starts from stability theory of dynamic system , In addition, it adopts Logistic mapping of discrete chaotic system and uses modular operation to design the synchronization and secure communication. This design is easily realization and has stronger anti-interference ability, and then the secure capacity of secure communication system is nice. © 2009 IEEE.

关键词： Secure communication

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Application of smart antenna interference suppression techniques in TD-SCDMA systems

Application of smart antenna interference suppression techni...

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6th International Conference on Fuzzy systems and Knowledge Discovery, FSKD 2009

作者： He, Hong He, Ying Zhang, Baofeng Zhang, Dajian Tian, Yong Wang, Kexi Meng, Hui Hou, Mingfeng Tianjin University of Technology Tianjin Key Laboratory for Control Theory and Application in Complicated Systems Tianjin 300191 China Research Institute of Measure Technology Tianjin 300192 China

ISBN: (纸本)9780769537351

The quality of mobile communications have been severely affected by interference among users in TD-SCDMA, in allusion to this problem, the smart antenna adaptive beam-forming algorithm are researched deeply in the thesis. According to the technical features that smart antenna can adaptive track the user signals realize the design and simulation of smart antenna in interference suppression, and compare and analyze the result then prove the advantage and disadvantage of two algorithms. We simulates the adaptive filter with MATLAB, the results prove that it can suppression interference in TD-SCDMA system with the effectiveness. © 2009 IEEE.

关键词： MATLAB

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Study on the Spatial Division Multiplexing Technique of Fiber Bragg Grating Sensors

Study on the Spatial Division Multiplexing Technique of Fibe...

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Photonics and Optoelectronics, SOPO

作者： Li Li Hong He Yuchi Lin Tianjin Key Laboratory of Control Theory & Applications in Complicated Systems Tianjin University of Technology Tianjin China

The optical switch spatial division multiplexing sensing system is proposed by using wavelength division multiplexer and unbalanced Mach-Zehnder interferometer. controlled by an optical switch, fiber Bragg grating sensing system based on spatial division multiplexing was achieved when a broadband source illumines FBG sensor array. With an isosceles triangle cantilever beam to realize linear tuning of Bragg wavelength of fiber grating without chirping by adjusting the deflection of the free end, the system employs an unbalanced Mach-Zehnder interferometer to translate the FBG wavelength signal related the strain into phase signal. The wavelength division multiplexer is adopt to realize the demand of the change of different fiber Bragg grating wavelength. The strain can be recovered by measuring the phase change of the signal with signal processing circuit. With the characteristic of high resolution, wide measuring range, this sensing system has the capability of measuring static strain as well as dynamic strain. Experiment demonstrated that the sensing sensitivity of this system, which was with a resolution of 20 nepsiv, was 0.29deg/muepsiv.

关键词： Strain measurement Wavelength division multiplexing Fiber gratings Bragg gratings Sensor arrays Wavelength measurement Optical switches Optical fiber sensors Optical arrays Signal processing

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Research of 3-Phase Reversible Rectifier Based on Current Hysteresis Regulator

Research of 3-Phase Reversible Rectifier Based on Current Hy...

引用

International Workshop on Computer Science and Engineering (WCSE)

作者： Kexin Wei Zishan Yang Chao Dong Tianjin Key Laboratory of Control Theory and Applications in Complicated Systems Tianjin University of Technology Tianjin China

According to the control requirement and actual project condition of three-phase high power factor rectifier, for the sake of eliminating inconstant switching frequency in the converter that brought on rather serious power supply harmonic pollution and shock damage of power devices and reducing difficulty of filter circuit design, based on these problems the constant switching frequency control algorithm adopting current hysteresis regulator was put forward. It combines their respective advance of current hysteresis control and constant switching frequency strategy, enhanced the system's dynamic response and well robust character, and minimized its switching loss. In terms of simulation results analysis, and construction of an experimental prototype based on DSP TMS320F2812, both of them verified the validity and superiority of the proposed algorithm.

关键词： Rectifiers Hysteresis Regulators Switching frequency Power harmonic filters Reactive power Switching converters Power supplies Power system harmonics Pollution

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The Research of Optimized Torque control Algorithm for PMSM Based on Grey Prediction Model

The Research of Optimized Torque Control Algorithm for PMSM ...

引用

International Conference on Fuzzy systems and Knowledge Discovery (FSKD)

作者： Gang Zhao Jinzhao Feng Qiang Sun Tianjin Key Laboratory of Control Theory and Applications in Complicated Systems Tianjin University of Technology Tianjin China

This paper realized the establishment of grey model for the uncertain part in terms of the analysis of current loop model in permanent-magnet synchronous motor (PMSM) close-loop control system in order to acquire improvement of current tracking character. Based on this model and the combination of torque constant value Kt in online identified strategy, this algorithm could enhance the calculation veracity of Kt through improving voltage accuracy, which made toque control precision improved to some extent. Through the MATLAB software to carry through algorithm simulation, compared with traditional PID control method, the result indicated that adopting grey prediction model to put up compensation control was able to improve current tracking capability and to achieve higher accuracy for torque control.

关键词： Torque control Predictive models Mathematical model Synchronous motors control system synthesis Tracking loops Voltage control MATLAB Software algorithms Three-term control

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Simulation for doppler signal periodogram spectral estimation methods

Simulation for doppler signal periodogram spectral estimatio...

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Joint Conference of the 2009 Symposium on Piezoelectricity, Acoustic Waves, and Device applications, SPAWDA 2009 and 2009 China Symposium on Frequency control Technology

作者： He, Hong Liu, Fang Zhang, Da-Jian Zhang, Bao-Feng Tian, Yong Wang, Ke-Xi Meng, Hui Hou, Ming-Feng Tianjin University of Technology Tianjin Key Laboratory for Control Theory and Application in Complicated Systems Tianjin 300191 China Research Institute of Measure Technology Tianjin 300192 China

ISBN: (纸本)9781424449507

With the rapid development of modern intelligent traffic, the speed-testing radar becomes a kind of essential equipment, which measures speed through the acquisition of the moving target signal frequency deviation according to Doppler principles. Traditional method uses analog filtering, whose measurement accuracy is low and the measured speed is slow. Obviously, it's difficult to meet the need of the modern intelligent transportation management. Speed radar signal processing generally uses the power spectrum estimation method. Periodogram Spectral estimation (using Hamming window periodogram method) considers for different signal to noise ratio of the data spectral estimation, and finally receives the largest frequency error to meet the system requirements for measurement accuracy. © 2009 IEEE.

关键词： Signal to noise ratio

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VRS technology based on multi-base station network and its error analysis

VRS technology based on multi-base station network and its e...

引用

Joint Conference of the 2009 Symposium on Piezoelectricity, Acoustic Waves, and Device applications, SPAWDA 2009 and 2009 China Symposium on Frequency control Technology

作者： He, Hong Liu, Hao Zhang, Da-Jian Zhang, Bao-Feng Tian, Yong Wang, Ke-Xi Meng, Hui Hou, Ming-Feng Tianjin University of Technology Tianjin Key Laboratory for Control Theory and Application in Complicated Systems Tianjin 300384 China Research Institute of Measure Technology Tianjin 300192 China

ISBN: (纸本)9781424449507

The existing problems of conventional RTK in actual applications specifically indicate that the difference technology can only eliminate the public error between base station and subscriber station under certain conditions. With the increases of baseline length (more than 20 km), the correlation of errors between tropospheric and ionospheric weakens or even disappears such that, the differential GPS technology loses its theoretical foundation. The experimental analysis shows that in network RTK, the Virtual Reference Station RTK technology enables VRS technology to extend the effective distance from 15 km to 50 km or more, and thus, to greatly enhance the relative positioning accuracy in medium-baseline and long-baseline (20-50km). © 2009 IEEE.

关键词： Error analysis

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DSP-Based control of the New Current Hystersis PWM Rectifier System

DSP-Based Control of the New Current Hystersis PWM Rectifier...

引用

International Workshop on Intelligent systems and applications, ISA

作者： Kexin Wei Huaping Li Shuiming Wang Tianjin Key Laboratory of Control Theory and Applications in Complicated Systems Tianjin University of Technology Tianjin China

In this paper, according to the control requirement and actual project conditions of three-phase high power factor rectifier, the research of low switching losses three-phase PWM rectifier adopts hysteresis current control strategy which bases on load current feed-forward control. The system not only improves the high-frequency switching problem, but also makes that the system has much lower dependence on the PI parameters of the outer-loop voltage regulator than conventional hysteresis current control PWM rectifiers. The system works well even under unbalance power conditions. Both simulated and experimental results confirm the validity of the new control strategy and lower dependence on the PI parameters of the outer- loop voltage regulator.

关键词： Pulse width modulation control systems Rectifiers Hysteresis Current control Regulators Reactive power Switching loss Feedforward systems Voltage control

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