阵风响应分析是大型飞机设计过程中必不可少的环节,现有的阵风响应分析主要采用基于线化升力面理论的气动力模型,不能考虑到各种非线性效应,不适合于跨音速气动弹性的分析.基于CFD技术,采用系统辨识方法,在状态空间内建立了降阶的非定...阵风响应分析是大型飞机设计过程中必不可少的环节,现有的阵风响应分析主要采用基于线化升力面理论的气动力模型,不能考虑到各种非线性效应,不适合于跨音速气动弹性的分析.基于CFD技术,采用系统辨识方法,在状态空间内建立了降阶的非定常气动力模型(reduced order model,ROM).耦合结构运动方程、非定常气动力模型(结构运动)、外激阵风的气动力模型,建立了基于CFD技术的阵风响应分析模型.算例研究了某一典型机翼在方波激励下的阵风响应问题,对比了各阶模态位移的响应以及翼根弯矩的响应.基于ROM技术的计算结果与CFD/CSD直接耦合仿真结果吻合,证明了该方法的正确性和精度.展开更多
OBJECTIVE:The purpose of this study was to determine whether acupuncture is effective in reducing pain and swelling around the knee and improving range of motion(ROM) during the post-acute phase of rehabilitation afte...OBJECTIVE:The purpose of this study was to determine whether acupuncture is effective in reducing pain and swelling around the knee and improving range of motion(ROM) during the post-acute phase of rehabilitation after total knee arthroplasty(TKA).METHODS:Following TKA,80 knees in 80 patients were randomly assigned to either an acupuncture treatment group(Group A) or a control group(Group C).In Group A,the complementary treatment of acupuncture was performed three times/week from postoperative day 7 until postoperative day 21.Outcome measures were:i) pain as assessed by a visual analog scale;ii) reduction of swelling around the knee as indicated by its circumference at the center of the patella;and iii) ROM of the affected knee.RESULTS:Group A patients had significantly reduced pain and swelling around the knees and earlier recovery of ROM than did those in Group C.CONCLUSION:Acupuncture provides effective treatment during the post-acute phase of rehabilitation after TKA with respect to pain relief,reduction of swelling around the knee,and early recovery of ROM.展开更多
文摘阵风响应分析是大型飞机设计过程中必不可少的环节,现有的阵风响应分析主要采用基于线化升力面理论的气动力模型,不能考虑到各种非线性效应,不适合于跨音速气动弹性的分析.基于CFD技术,采用系统辨识方法,在状态空间内建立了降阶的非定常气动力模型(reduced order model,ROM).耦合结构运动方程、非定常气动力模型(结构运动)、外激阵风的气动力模型,建立了基于CFD技术的阵风响应分析模型.算例研究了某一典型机翼在方波激励下的阵风响应问题,对比了各阶模态位移的响应以及翼根弯矩的响应.基于ROM技术的计算结果与CFD/CSD直接耦合仿真结果吻合,证明了该方法的正确性和精度.
文摘OBJECTIVE:The purpose of this study was to determine whether acupuncture is effective in reducing pain and swelling around the knee and improving range of motion(ROM) during the post-acute phase of rehabilitation after total knee arthroplasty(TKA).METHODS:Following TKA,80 knees in 80 patients were randomly assigned to either an acupuncture treatment group(Group A) or a control group(Group C).In Group A,the complementary treatment of acupuncture was performed three times/week from postoperative day 7 until postoperative day 21.Outcome measures were:i) pain as assessed by a visual analog scale;ii) reduction of swelling around the knee as indicated by its circumference at the center of the patella;and iii) ROM of the affected knee.RESULTS:Group A patients had significantly reduced pain and swelling around the knees and earlier recovery of ROM than did those in Group C.CONCLUSION:Acupuncture provides effective treatment during the post-acute phase of rehabilitation after TKA with respect to pain relief,reduction of swelling around the knee,and early recovery of ROM.
