基于S变换的叠梁闸门水脉动压力特性研究
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摘要
以叠梁闸门脉动水压力为研究对象,采用S变换方法对叠梁闸门泄水过程的脉动压力信号进行时频分析处理,研究脉动压力信号能量在时频内的分布规律,确定脉动水压力在不同泄水方案下的优势频率。通过脉动压力优势频率和叠梁闸门的固有频率分析比较,判定在泄水过程中叠梁闸门发生共振现象的可能。结果表明,脉动水压力为低频分布,不同时刻的频率明显不同;不同取水方案时频率成分有明显的变化,随着取水高程的增加,脉动能量分布越来越广泛,频率成分也越来越丰富。在泄水过程中脉动水压力频率较小,远小于叠梁闸门固有频率,闸门运行过程中不会出现共振现象。
Taking pulsating water pressure of a stop log gate as an example,S-stransformation was adopted to analyze pulsating water pressure signals recorded in time frequency domain,the energy distribution laws in time-frequency domain and the dominant frequencies of a pulsating water pressure signal were investigated.The resonance in the working condition was judged through comparing the frequencies of the pulsating water pressure and the natural ones of the stop log gate.The results showed that the frequencies of the pulsating water pressure are lower and vary with time;the frequency components have obvious change in different intake schemes,the pulsating energy and the frequency components are more abundant with increase in intake altitude;the frequencies of the pulsating water pressure are much lower during the process of outlet than the natural ones of the stop log gate,so the resonance can be avoided.
Taking pulsating water pressure of a stop log gate as an example,S-stransformation was adopted to analyze pulsating water pressure signals recorded in time frequency domain,the energy distribution laws in time-frequency domain and the dominant frequencies of a pulsating water pressure signal were investigated.The resonance in the working condition was judged through comparing the frequencies of the pulsating water pressure and the natural ones of the stop log gate.The results showed that the frequencies of the pulsating water pressure are lower and vary with time;the frequency components have obvious change in different intake schemes,the pulsating energy and the frequency components are more abundant with increase in intake altitude;the frequencies of the pulsating water pressure are much lower during the process of outlet than the natural ones of the stop log gate,so the resonance can be avoided.
引文
[1]Pinnegar C R.Time-frequency and time-time filtering with the S-transform and TT-transform[J].Digital Signal Processing, 2005,15:604-620.
[2]樊剑,吕超,张辉.基于S变化的地震波时频分析及人工调整[J].振动工程学报,2008,21(4):381-386.
[3]Jones K A,Porjesz B,Chorlian D,et al.S-transform time-frequency analysis of P300 reveals deficits in individuals diagnosed with alcoholism[J].Clinical Neurophysiology,2006, 117:2128-2143.
[4]彭新民,郭航忠,张蕊.流脉动压力的小波分析研究[J].水利学报,2003,8:26-31.
[5]瞿伟廉,刘少兵,王锦文,等.弧形闸门流激振动脉动压力HHT分析[J].武汉理工大学学报,2006,28(9):68-71.
[6]雷艳,刘礼华,魏晓斌,等.分层进水口导水叠梁门模型脉动压力最大幅值取值分析[J].动力学研究与进展A, 2007.22(3):273-277.
[7]Dursun A,Sarac Z,Topkara H S,et al.Phase recovery from interference fringes by using S-transform[J],Measurement, 2008,41:403-411.
[2]樊剑,吕超,张辉.基于S变化的地震波时频分析及人工调整[J].振动工程学报,2008,21(4):381-386.
[3]Jones K A,Porjesz B,Chorlian D,et al.S-transform time-frequency analysis of P300 reveals deficits in individuals diagnosed with alcoholism[J].Clinical Neurophysiology,2006, 117:2128-2143.
[4]彭新民,郭航忠,张蕊.流脉动压力的小波分析研究[J].水利学报,2003,8:26-31.
[5]瞿伟廉,刘少兵,王锦文,等.弧形闸门流激振动脉动压力HHT分析[J].武汉理工大学学报,2006,28(9):68-71.
[6]雷艳,刘礼华,魏晓斌,等.分层进水口导水叠梁门模型脉动压力最大幅值取值分析[J].动力学研究与进展A, 2007.22(3):273-277.
[7]Dursun A,Sarac Z,Topkara H S,et al.Phase recovery from interference fringes by using S-transform[J],Measurement, 2008,41:403-411.
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