4篇
您的检索式：作者名="MENG Lingya"
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| 1 | Backstepping-based active fault-tolerant control for a class of uncertain SISO nonlinear systems显示文摘Active fault-tolerant control is investigated for a class of uncertain SISO nonlinear flight control systems based on the adaptive observer, feedback linearization and backstepping theory.Firstly an adaptive observer is constructed to estimate the fault in the faulty system.A new fault updating law is presented to simplify the assumption conditions of the adaptive observer.The asymptotical stability of the observer and the uniform ultimate boundedness of the fault estimation error are guaranteed by Lyapunov theorem.Then a backstepping-based active fault-tolerant controller is designed for the faulty system.The asymptotical stability of the closed-loop system and uniform ultimate boundedness of the tracking error are proved based on Lyapunov theorem.The effectiveness of the proposed scheme is demonstrated through the numerical simulation of a flight control system. | Meng Lingya Jiang Bin | 2009 | Journal of Systems Engineering and Electronics2009，20，6： | 6 |
| 2 | Leak Detection of Gas Pipelines Based on Characteristics of Acoustic Leakage and Interfering Signals显示文摘When acoustic method is used in leak detection for natural gas pipelines,the external interferences including operation of compressor and valve,pipeline knocking,etc.,should be distinguished with acoustic leakage signals to improve the accuracy and reduce false alarms.In this paper,the technologies of extracting characteristics of acoustic signals were summarized.The acoustic leakage signals and interfering signals were measured by experiments and the characteristics of time-domain,frequency-domain and time-frequency domain were extracted.The main characteristics of time-domain are mean value,root mean square value,kurtosis,skewness and correlation function,etc.The features in frequency domain were obtained by frequency spectrum analysis and power spectrum density,while time-frequency analysis was accomplished by short time Fourier transform.The results show that the external interferences can be removed effectively by the characteristics of time domain,frequency domain and time-frequency domain.It can be drawn that the acoustic leak detection method can be applied to natural gas pipelines and the characteristics can help reduce false alarms and missing alarms. | Lingya Meng Cuiwei Liu Liping Fang Yuxing Li Juntao Fu | 2019 | Sound & Vibration2019，53，4： | 2 |
| 3 | Ex-perimental study on leak detection and location for gaspipeline based on acoustic method显示文摘 | MENG Lingya LI Yuxing WANG Wuchang | 2012 | Journal of LossPrevention in the Process Industries2012，25，1： | 1 |
| 4 | Experimental study on leak detection and location for gas pipeline based on a-coustic method显示文摘 | Meng Lingya Li Yuxing Wang Wuchang | | 0，，01： | 1 |
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