The rigid flexible coupling system with a mass at non-tip position of the flexible beam is studied in this paper. Using the theory about mechanics problems in a non-inertial coordinate sys- tem, the dynamic equations ...The rigid flexible coupling system with a mass at non-tip position of the flexible beam is studied in this paper. Using the theory about mechanics problems in a non-inertial coordinate sys- tem, the dynamic equations of the rigid flexible coupling system with dynamic stiffening are estab- lished. It is clearly elucidated for the first time that, dynamic stiffening is produced by the coupling effect of the centrifugal inertial load distributed on the beam and the transverse vibration deformation of the beam. The modeling approach in this paper successfully solves problems of popular modeling methods nowadays： the derivation process is too complex by using only one dynamic principle; a clearly theoretical mechanism for dynamic stiffening can＇ t be offered. First, the mass at non-tip po- sition is incorporated into the continuous dynamic equations of the system by use of the Dirac lunch tion and the Heaviside function. Then, based on the conclusions of orthogonalization about the nor- mal constrained modes, the finite dimensional state space equations suitable for controller design are obtained. The numerical simulation results show that： dynamic stiffening is included in the first-or- der model established in this paper, which indicates the dynamic responses of the rigid flexible cou- pling system with large overall motion accurately. The results also show that the mass has a soften- ing effect on the dynamic behavior of the flexible beam, and the effect would be more obvious when the mass has a larger mass, or lies closer to the tip of the beam.展开更多
目的:观察耳穴贴压联合耳尖放血用于气滞血瘀型非特异性腰痛(non-specific low back pain,NLBP)的临床疗效。方法:选取2021年5月-2022年11月云南省某三级甲等中医医院中医特色护理门诊就诊的64例NLBP病人为研究对象,根据就诊先后顺序随...目的:观察耳穴贴压联合耳尖放血用于气滞血瘀型非特异性腰痛(non-specific low back pain,NLBP)的临床疗效。方法:选取2021年5月-2022年11月云南省某三级甲等中医医院中医特色护理门诊就诊的64例NLBP病人为研究对象,根据就诊先后顺序随机分为观察组与对照组各32例。对照组选取肾、肝、脾、神门、耳大神经、枕小神经、腰、膀胱、三焦、颈椎及腰椎等穴位进行耳穴贴压,观察组行耳尖针刺放血后再行耳穴贴压。比较两组病人治疗前后及1个月后的随访结果。结果:观察组病人满意度明显高于对照组(P<0.05)。两组病人治疗后及1个月随访时疼痛视觉模拟评分法(VAS)评分、Oswestry功能障碍指数(ODI)均较治疗前明显降低(P<0.05),且观察组明显低于对照组(P<0.05)。结论:耳穴贴压联合耳尖放血能减轻NLBP的疼痛症状,改善病人腰部功能障碍。与单独的耳穴贴压相比,联合治疗时病人的满意度更高。展开更多
文摘The rigid flexible coupling system with a mass at non-tip position of the flexible beam is studied in this paper. Using the theory about mechanics problems in a non-inertial coordinate sys- tem, the dynamic equations of the rigid flexible coupling system with dynamic stiffening are estab- lished. It is clearly elucidated for the first time that, dynamic stiffening is produced by the coupling effect of the centrifugal inertial load distributed on the beam and the transverse vibration deformation of the beam. The modeling approach in this paper successfully solves problems of popular modeling methods nowadays： the derivation process is too complex by using only one dynamic principle; a clearly theoretical mechanism for dynamic stiffening can＇ t be offered. First, the mass at non-tip po- sition is incorporated into the continuous dynamic equations of the system by use of the Dirac lunch tion and the Heaviside function. Then, based on the conclusions of orthogonalization about the nor- mal constrained modes, the finite dimensional state space equations suitable for controller design are obtained. The numerical simulation results show that： dynamic stiffening is included in the first-or- der model established in this paper, which indicates the dynamic responses of the rigid flexible cou- pling system with large overall motion accurately. The results also show that the mass has a soften- ing effect on the dynamic behavior of the flexible beam, and the effect would be more obvious when the mass has a larger mass, or lies closer to the tip of the beam.
文摘目的:观察耳穴贴压联合耳尖放血用于气滞血瘀型非特异性腰痛(non-specific low back pain,NLBP)的临床疗效。方法:选取2021年5月-2022年11月云南省某三级甲等中医医院中医特色护理门诊就诊的64例NLBP病人为研究对象,根据就诊先后顺序随机分为观察组与对照组各32例。对照组选取肾、肝、脾、神门、耳大神经、枕小神经、腰、膀胱、三焦、颈椎及腰椎等穴位进行耳穴贴压,观察组行耳尖针刺放血后再行耳穴贴压。比较两组病人治疗前后及1个月后的随访结果。结果:观察组病人满意度明显高于对照组(P<0.05)。两组病人治疗后及1个月随访时疼痛视觉模拟评分法(VAS)评分、Oswestry功能障碍指数(ODI)均较治疗前明显降低(P<0.05),且观察组明显低于对照组(P<0.05)。结论:耳穴贴压联合耳尖放血能减轻NLBP的疼痛症状,改善病人腰部功能障碍。与单独的耳穴贴压相比,联合治疗时病人的满意度更高。
