Objective:To evaluate the clinical efficacy of sinew-regulating bone-setting manipulations plus exercise therapy in treating chronic non-specific low back pain(CNLBP).Methods:A total of 65 CNLBP patients were divided ...Objective:To evaluate the clinical efficacy of sinew-regulating bone-setting manipulations plus exercise therapy in treating chronic non-specific low back pain(CNLBP).Methods:A total of 65 CNLBP patients were divided into two groups by the random number table method.Thirty-three cases in the treatment group were intervened by sinew-regulating bone-setting manipulations plus exercise therapy;32 cases in the control group were intervened by medium-frequency electrotherapy plus exercise therapy.Before and after treatment,visual analog scale(VAS),dynamic and static muscle endurance of low back,median frequency(MF)of surface electromyography(sEMG)and Oswestry disability index(ODI)were used to evaluate the low back function.The therapeutic efficacy was estimated after treatment.Results:The two groups each had 2 dropouts during the study.The total effective rate was 90.3%in the treatment group versus 66.7%in the control group,and the between-group difference was statistically significant(P<0.05).After treatment,the VAS score,dynamic and static muscle endurance of low back,MF of sEMG and ODI score all changed significantly in both groups(all P<0.05);all the items in the treatment group were significantly different from those in the control group(all P<0.05).Conclusion:Sinew-regulating bone-setting manipulations plus exercise therapy can effectively release pain in CNLBP patients,increase muscle endurance of the low back and improve the quality of life,and its therapeutic efficacy is more significant than that of medium-frequency electrotherapy plus exercise therapy.展开更多
To enhance the applicability and measurement accuracy of phase-based optical flow method using complex steerable pyramids in structural displacement measurement engineering applications, an improved method of optimizi...To enhance the applicability and measurement accuracy of phase-based optical flow method using complex steerable pyramids in structural displacement measurement engineering applications, an improved method of optimizing parameter settings is proposed. The optimized parameters include the best measurement points of the Region of Interest (ROI) and the levels of pyramid filters. Additionally, to address the issue of updating reference frames in practical applications due to the difficulty in estimating the maximum effective measurement value, a mechanism for dynamically updating reference frames is introduced. Experimental results demonstrate that compared to representative image gradient-based displacement measurement methods, the proposed method exhibits higher measurement accuracy in engineering applications. This provides reliable data support for structural damage identification research based on vibration signals and is expected to broaden the engineering application prospects for structural health monitoring.展开更多
Microstructured roll workpieces have been widely used as functional components in the precision industries. Current researches on quality control have focused on surface profile measurement of microstructured roll wor...Microstructured roll workpieces have been widely used as functional components in the precision industries. Current researches on quality control have focused on surface profile measurement of microstructured roll workpieces, and types of measurement systems and measurement methods have been developed. However, low measurement efficiency and low measurement accuracy caused by setting errors are the common disadvantages for surface profile measurement of microstructured roll workpieces. In order to shorten the measurement time and enhance the measurement accuracy, a method for self-calibration and compensation of setting errors is proposed for surface profile measurement of microstructured roll workpieces. A measurement system is constructed for the measurement, in which a precision spindle is employed to rotate the roll workpiece and an air-bearing displacement sensor with a micro-stylus probe is employed to scan the microstructured surface of the roll workpiece. The resolution of the displacement sensor is 0.14 nm and that of the rotary encoder of the spindle was 0.15r~. Geometrical and mathematical models are established for analyzing the influences of the setting errors of the roll workpiece and the displacement sensor with respect to the axis of the spindle, including the eccentric error of the roll workpiece, the offset error of the sensor axis and the zero point error of the sensor output. Measurement experiments are carded out on a roll workpiece on which periodic microstructures are a period of 133 i^m along the circumferential direction. Experimental results demonstrate the feasibility of the self-compensation method. The proposed method can be used to detect and compensate the setting errors without using any additional accurate artifact.展开更多
在研究起重机吊重系统防摇控制时,可以分别对小车位移和摆角子系统进行控制器设计。由于在起重机摆角子系统中吊重摆角角速度一般靠传感器进行测量,增加了运行和维护成本。为此提出了设计起重机摆角子系统非线性扩张状态观测器对起重机...在研究起重机吊重系统防摇控制时,可以分别对小车位移和摆角子系统进行控制器设计。由于在起重机摆角子系统中吊重摆角角速度一般靠传感器进行测量,增加了运行和维护成本。为此提出了设计起重机摆角子系统非线性扩张状态观测器对起重机摆角子系统状态信息进行重构,软测量摆角角速度。给出了观测器的结构方程,并运用Matlab对观测器参数进行了优化整定。参数整定后的扩张状态观测器能够在0.3 s内估计出系统摆角和摆角速度,并且在0.5 s内估计出了系统的外界干扰。仿真结果表明:经过Matlab参数整定的扩张状态观测器(extend state observer,ESO)可以实现对非线性的起重机摆角子系统状态信息的软测量。展开更多
In order to improve the machining ac cu racy of spiral bevel gear,difference surface was adopted to characterize its gl obal form deviations quantifiably and correct its deviations.The theoretical to oth surface model...In order to improve the machining ac cu racy of spiral bevel gear,difference surface was adopted to characterize its gl obal form deviations quantifiably and correct its deviations.The theoretical to oth surface model of spiral bevel gear was built,and the actual tooth surface o f spiral bevel gear had been got by using latticed measurement.The equation of difference surface which can characterize the actual tooth surface deviation s was built by means of mathematical method in combination with measurement prin ciple.The quantitative mathematical relationship between the actual tooth surfa ce deviations of spiral bevel gear and the corrected values of the machine-sett ing parameters had been referred,and the theoretical correction formula of the global form deviations had been got by the least square method.Finally,the pinion of spiral bevel gear in the automobile rear axle has been set for an exam ple to account for the effectiveness of the deviation correction by use of the d ifference surface method.展开更多
文摘Objective:To evaluate the clinical efficacy of sinew-regulating bone-setting manipulations plus exercise therapy in treating chronic non-specific low back pain(CNLBP).Methods:A total of 65 CNLBP patients were divided into two groups by the random number table method.Thirty-three cases in the treatment group were intervened by sinew-regulating bone-setting manipulations plus exercise therapy;32 cases in the control group were intervened by medium-frequency electrotherapy plus exercise therapy.Before and after treatment,visual analog scale(VAS),dynamic and static muscle endurance of low back,median frequency(MF)of surface electromyography(sEMG)and Oswestry disability index(ODI)were used to evaluate the low back function.The therapeutic efficacy was estimated after treatment.Results:The two groups each had 2 dropouts during the study.The total effective rate was 90.3%in the treatment group versus 66.7%in the control group,and the between-group difference was statistically significant(P<0.05).After treatment,the VAS score,dynamic and static muscle endurance of low back,MF of sEMG and ODI score all changed significantly in both groups(all P<0.05);all the items in the treatment group were significantly different from those in the control group(all P<0.05).Conclusion:Sinew-regulating bone-setting manipulations plus exercise therapy can effectively release pain in CNLBP patients,increase muscle endurance of the low back and improve the quality of life,and its therapeutic efficacy is more significant than that of medium-frequency electrotherapy plus exercise therapy.
文摘To enhance the applicability and measurement accuracy of phase-based optical flow method using complex steerable pyramids in structural displacement measurement engineering applications, an improved method of optimizing parameter settings is proposed. The optimized parameters include the best measurement points of the Region of Interest (ROI) and the levels of pyramid filters. Additionally, to address the issue of updating reference frames in practical applications due to the difficulty in estimating the maximum effective measurement value, a mechanism for dynamically updating reference frames is introduced. Experimental results demonstrate that compared to representative image gradient-based displacement measurement methods, the proposed method exhibits higher measurement accuracy in engineering applications. This provides reliable data support for structural damage identification research based on vibration signals and is expected to broaden the engineering application prospects for structural health monitoring.
文摘Microstructured roll workpieces have been widely used as functional components in the precision industries. Current researches on quality control have focused on surface profile measurement of microstructured roll workpieces, and types of measurement systems and measurement methods have been developed. However, low measurement efficiency and low measurement accuracy caused by setting errors are the common disadvantages for surface profile measurement of microstructured roll workpieces. In order to shorten the measurement time and enhance the measurement accuracy, a method for self-calibration and compensation of setting errors is proposed for surface profile measurement of microstructured roll workpieces. A measurement system is constructed for the measurement, in which a precision spindle is employed to rotate the roll workpiece and an air-bearing displacement sensor with a micro-stylus probe is employed to scan the microstructured surface of the roll workpiece. The resolution of the displacement sensor is 0.14 nm and that of the rotary encoder of the spindle was 0.15r~. Geometrical and mathematical models are established for analyzing the influences of the setting errors of the roll workpiece and the displacement sensor with respect to the axis of the spindle, including the eccentric error of the roll workpiece, the offset error of the sensor axis and the zero point error of the sensor output. Measurement experiments are carded out on a roll workpiece on which periodic microstructures are a period of 133 i^m along the circumferential direction. Experimental results demonstrate the feasibility of the self-compensation method. The proposed method can be used to detect and compensate the setting errors without using any additional accurate artifact.
文摘在研究起重机吊重系统防摇控制时,可以分别对小车位移和摆角子系统进行控制器设计。由于在起重机摆角子系统中吊重摆角角速度一般靠传感器进行测量,增加了运行和维护成本。为此提出了设计起重机摆角子系统非线性扩张状态观测器对起重机摆角子系统状态信息进行重构,软测量摆角角速度。给出了观测器的结构方程,并运用Matlab对观测器参数进行了优化整定。参数整定后的扩张状态观测器能够在0.3 s内估计出系统摆角和摆角速度,并且在0.5 s内估计出了系统的外界干扰。仿真结果表明:经过Matlab参数整定的扩张状态观测器(extend state observer,ESO)可以实现对非线性的起重机摆角子系统状态信息的软测量。
基金National Natural Science Foundation of China(No.50976108)
文摘In order to improve the machining ac cu racy of spiral bevel gear,difference surface was adopted to characterize its gl obal form deviations quantifiably and correct its deviations.The theoretical to oth surface model of spiral bevel gear was built,and the actual tooth surface o f spiral bevel gear had been got by using latticed measurement.The equation of difference surface which can characterize the actual tooth surface deviation s was built by means of mathematical method in combination with measurement prin ciple.The quantitative mathematical relationship between the actual tooth surfa ce deviations of spiral bevel gear and the corrected values of the machine-sett ing parameters had been referred,and the theoretical correction formula of the global form deviations had been got by the least square method.Finally,the pinion of spiral bevel gear in the automobile rear axle has been set for an exam ple to account for the effectiveness of the deviation correction by use of the d ifference surface method.
