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地面联合试验台是一项大型综合试验设备,本文从联合试验台测控系统总体设计方案,硬件和软件工程实施的角度,较详细介绍了系统组成,网络实施和软件的开发。 相似文献
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本文介绍了油泵性能试验台的系统构成,在分析传统油泵性能试验台缺点的基础上,提出新设计油泵性能试验台优化和改进方法。 相似文献
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中国空气动力研究与发展中心研制的旋翼/机身组合模型试验台,具有阻塞度小、功率大、支架干扰小等优点。近年来,试验台通过配套研制标模系统、改进测量系统及旋翼操纵系统标定方法等工作,使试验台的水平和能力得到了进一步的提升。验证试验表明:该试验台技术先进、性能指标优良,安全稳定性好,试验数据精准度高,可作为直升机型号研制和课题研究可靠的试验平台。 相似文献
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对惯性试验台现有的加载系统进行了详细的讨论,通过分析计算找出其中存在的弊端。并就惯性试验台加载系统的改造进行了探讨,提出了一套切实可行的改造方案。 相似文献
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水气试验台可测试航空水系统产品中的以水和空气为介质的产品。水气试验台包含三个回路:空气驱动回路、空气增压调压回路和水回路,同时内部设有安全装置。经实际论证,该水气试验台可满足水系统产品附件维修手册要求。 相似文献
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本文详细研究飞机防滑刹车系统负载(静态)试验和飞机防滑刹车系统健康诊断试验,提出飞机防滑刹车系统负载(静态)试验、飞机防滑刹车系统健康诊断试验、飞机防滑刹车系统动力、电磁效能试验和环境鉴定试验的分类方法,保证了飞机刹车系统功能、性能全面考核。 相似文献
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针对民用飞机刹车系统的重要组成部分自动刹车系统,介绍了自动刹车系统的功能,并对其原理进行了简单介绍,提出了一种适用于自动刹车系统开发的基于模型驱动的设计方法,根据自动刹车的功能需求,建立其对应的行为模型,对需求进行确认以及验证,根据自动刹车的功能架构对其行为模型进行集成,形成自动刹车功能的集成模型,确认、验证其架构的正确性。最后,综合考虑自动刹车的需求以及行为模型,建立基于模型的各工况测试用例,包括着陆刹车以及中止起飞测试用例,对自动刹车系统需求进行自动化测试,验证其正确性、完整性。最后,以着陆阶段自动刹车某一减速率为例对该方法进行了验证,确认了该方法的正确性。模型及管理工具分别为Library、Stateflow、Simulink。 相似文献
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《Aerospace Science and Technology》2007,11(5):360-369
The demands on helicopter rotor brakes are given by laws and airworthiness regulations. The systems are designed and certified according to airworthiness demands such as JAR 27/29 and FAR 27/29. The present paper presents the rotor brake systems of commercial and military helicopters. The rotor brake systems include brake discs made out of steel and brake callipers with two-side-activating pistons. The actuation is performed by independent hydraulic systems. Together with the development of the different helicopter types an evolution of the brake systems took place. An example for this evolution is the indication of the brake control system on a state-of-the art commercial helicopter. Every occurring brake effort between brake disc and brake pads is indicated by the motion of the brake calliper against a micro switch. An example of a brake system which includes a brake disc made out of carbon fiber reinforced carbon material is presented. The disc is mounted with the possibility of sliding in axial direction. The hydraulic actuation is included in the main pressure supply system of the helicopter. Difficulties may occur by inhomogeneous heating of the brake discs. The analysis of the short and long duration tests on test benches and by helicopter flight tests revealed the detailed behavior especially of the thermal spots. The non-uniform heat dissipation caused hot spots and in some cases cracks. With the gained knowledge of the physical behavior, the brake disc was redesigned with success.The goal of the paper is to show the specific demands of helicopter rotor brakes, the designs for different helicopter types as well as the realization of the solutions and system tests. 相似文献
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航空小型动力装置试验台测试系统 总被引:3,自引:2,他引:1
针对航模、无人驾驶侦察机和靶机等飞行器经常采用带螺旋桨的活塞式小型动力装置,本文设计了一种小型台架测试系统。文章介绍了系统的组成、硬件设计、软件设计及系统的应用。测试结果表明,该系统具有测试精度高、可靠性好、操作和维护方便等特点。 相似文献
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Traditional hydraulic brake systems require a complex system of pipelines between an aircraft engine driven pump (EDP) and brake actuators, which increases the weight of the aircraft and may even cause serious vibration and leakage problems. In order to improve the reliability and safety of more electric aircraft (MEA), this paper proposes a new integrated self-powered brake system (ISBS) for MEA. It uses a hydraulic pump geared to the main wheel to recover a small part of the kinetic energy of a landing aircraft. The recovered energy then serves as the hydraulic power supply for brake actuators. It does not require additional hydraulic source, thus removing the pipelines between an EDP and brake actuators. In addition, its self-powered characteristic makes it possible to brake as usual even in an emergency situation when the airborne power is lost. This paper introduces the working principle of the ISBS and presents a prototype. The mathematical models of a taxiing aircraft and the ISBS are established. A feedback linearization control algorithm is designed to fulfill the anti-skid control. Simulations are carried out to verify the feasibility of the ISBS, and experiments are conducted on a ground inertia brake test bench. The ISBS presents a good performance and provides a new potential solution in the field of brake systems for MEA. 相似文献
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构建飞机刹车系统方案设计环境,以提高飞机刹车系统方案设计阶段的设计效率和质量。研究刹车装置参数和防滑控制系统参数的快速确定方法,通过迭代的设计思想使结果符合设计要求;估算刹车装置性能和刹车系统的动态特性。在MATLAB/Simulink中建立刹车系统模型,通过MATLAB引擎调用的方式进行刹车系统的动力学分析;以某无人机刹车系统为设计实例进行其刹车系统的方案设计,动力学仿真中刹车系统工作良好,与实际工作状况基本吻合。结果表明:本文提供的飞机刹车方案设计方法快速有效。 相似文献
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建立了单组元发动机推力室系统(包括结构部件如隔热框、催化床、喷管等)的传热模型。在此基础上,应用有限元数值计算的方法,将模型进行轴对称Delaunay非结构化网格剖分,并完成瞬态温度场的模拟计算,进行推力室在轨温度的数值仿真。结合计算结果分析了热回浸现象、催化床电加热效能以及外空间辐射换热等问题。最后指出,隔热框的防热设计和空间辐射散热有效地隔绝了热回浸对电磁阀和喷注器的不良影响,并论证了催化床的电热丝加热是保证催化床在工作前维持一定温度范围之内的可靠方法。 相似文献
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通过了解使用情况、复查设计制造过程、断口金相分析技术、对比试验对飞机制动缸渗漏问题研究。结果表明,渗漏是由于制动缸活塞孔底破裂,刹车时液压油被挤出附着在制动缸表面。断口提示裂纹为多源疲劳断裂,疲劳源为内壁R2转角表面铬酸阳极化孔洞聚集处。制动缸端面内圆处承受较大弯矩是制动缸疲劳开裂的促成因素。采取改进机加和表面处理工艺,调整刹车系统上电自检压力等措施解决了问题。 相似文献