简介:采用运动学研究法对冯结、王冠寅完成的双杠“挂臂团身后空翻两周成挂臂”动作进行了研究。由手倒立开始下摆,两臂主动屈臂挂杠,下摆时足尖远伸,并逐步形成“背弓”。下摆时,冯黏先屈臂后下摆,王冠寅边屈臂边下摆。王冠寅屈臂下浪节奏较均匀,挂臂后增大并保持“背弓”,下摆至杠下垂面时,王冠寅的“背弓”较冯拮明显,获得的重心合速度较大,挂臂前摆过垂面后迅速向上兜腿,同时两臂用力压推杠。该动作腾空较低,翻转速度较快。当重心过杠水平面时两手用力推离杠,离杠后迅速屈髋、屈膝、抱腿,团身要紧。空翻挂臂时,要积极撒腿、伸髋,主动展体、抬头挺胸去挂杠。王冠寅的空翻高度、翻转及挂臂展体要优于冯诂。
简介:Inordertostudytheeffectsofgeometricparametersoftherudderonthehydrodynamicperformanceofthepropeller-ruddersystem,thesurfacepanelmethodisusedtobuildthenumericalmodelofthesteadyinteractionbetweenthepropellerandruddertoanalyzetherelevantfactors.Theinteractionbetweenthepropellerandrudderisconsideredthroughtheinducedvelocities,whicharecircumferentiallyaveraged,sotheunsteadyproblemistranslatedtosteadystate.Aniterativecalculationmethodisuseduntilthehydrodynamicperformanceconverges.Firstly,thehydrodynamicperformanceofthechosenpropeller-ruddersystemiscalculated,andthecomparisonbetweenthecalculatedresultsandtheexperimentaldataindicatesthatthecalculationprogramisreliable.Then,thevariableparametersofrudderareinvestigated,andthecalculationresultsshowthatthepropeller-rudderspacinghasanegativerelationshipwiththeefficiencyofthepropeller-ruddersystem,andtherudderspanhasanoptimalmatchrangewiththepropellerdiameter.Futhermore,therudderchordandthicknessbothhaveapositivecorrelationwiththehydrodynamicperformanceofthepropeller-ruddersystem.
简介:摘要:飞机舵面主要是在气流中飞行控制系统的液压作动子系统操纵舵面偏转而产生控制力来操作飞行的气动翼面。开缝式舵面飞机外翼后缘增升装置分为襟翼和襟副翼,襟翼、襟副翼在结构形式上采用了开缝襟翼,舵面面积和迎风面积增大,从而缩短了滑跑距离。本文主要通过分析缝翼操纵系统运动原理,确定了一种缝翼角度的调节方法,从而保证缝翼偏转角度。