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。
简介:摘 要 本文以郑万铁路8标白沙河大桥为背景,采用(40+72+40)m转体连续梁跨越宁西电气化铁路双线,双幅桥梁在既有宁西铁路双线间进行转体合拢,受铁路上部净空限制,存在极大的安全隐患。通过采取在梁端预埋钢壳的技术,降低了转体合拢段施工风险,提高了施工效率,为类似工程提供借鉴和参考。