共查询到20条相似文献,搜索用时 10 毫秒
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吕安常 《中国民航学院学报》1990,(3):24-32
本文依据描述函数法分析非线性系统之原理,运用 BASIC 语言,提出了非线性系统计算机辅助分析程序设计方法。文中涉及了五种典型非线性特征。运用此法编制的程序,能够判断系统在不同初始条件下的稳定性;如果系统存在自持振荡,则给出自持振荡的振幅和频率。同时,为使系统分析形象直观,在屏幕上进行了作图,并显示了分析结果. 相似文献
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Error Analysis of Space-Stable Inertial Navigation Systems 总被引:1,自引:0,他引:1
Nash R.A. Levine S.A. Roy K.J. 《IEEE transactions on aerospace and electronic systems》1971,(4):617-629
The error equations for a space-stable inertial navigation system are derived. This is done by directly perturbing the mechanization equations in the inertial frame and then transforming in open-loop fashion to the local-level frame. A rotating inertial platform and velocity and altitude damping are considered. The relations between errors in space-stable and local-level systems are noted. Numerical results are presented for certain random error sources. 相似文献
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This paper discusses the techniques and problem areas associated with the charging of sealed secondary batteries for spacecraft, and the operating characteristics of the modified voltage-limited charging system. An approach is described for the characterization of battery parameters. The method of selection of a suitable voltage-temperature limit, with regard to battery parameters and system performance requirements, is described. A 4 ampere-hour battery system is analyzed, and its capability is defined parametrically. 相似文献
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Leang-San Shieh Chih-Fan Chen 《IEEE transactions on aerospace and electronic systems》1969,(6):967-973
This paper is intended as an exposition of some approximation techniques on irrational transfer functions which are frequently encountered in control systems. Two algorithms for continued fraction expansion and inversion are established. 相似文献
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Holt John M. Anderson Ronald M. 《IEEE transactions on aerospace and electronic systems》1968,(2):305-314
The time required to execute a successful escape maneuver must be deduced from considerations of the following times: time required to gain adequate altitude separation, delay time due to pilot reaction, aircraft servo-system delay, delay due to missed data, delay due to data arrival time, alarm delay due to ? errors, time to stop turning, and time to level off. Since each of these times is a random variable, the required escape time must be determined in a probabilistic sense. By assigning appropriate probability density functions to each of the times involved, formulas are derived for the escape times required by the CAS hazard logic. The results of a simulation of 10 000 aircraft encounters verify the suitability of the formulas. 相似文献
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阐述了型号研制过程中建立故障报告、分析和纠正措施系统 (FRACAS)的重要性 ,详细论述了在型号研制过程中开展FRACAS所要求的各项工作的程序和方法、如何对该系统进行管理 ,以及保证FRA CAS正常运行的信息系统的传递流程。 相似文献
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Leondes Cornelius T. Nakano Hiroshi 《IEEE transactions on aerospace and electronic systems》1966,(5):595-607
This paper investigates the stability analysis of nonlinear inertial guidance platform control systems. The principle technique used for this investigation is the direct method of Lyapunov. First, stability criteria are derived for third- and fourth-order systems with saturation type nonlinearity by using the technique developed by R. E. Kalman and Z. V. Rekasius. A method of finding the maximum loop gain g/h is then shown, and the results are compared with those obtained by linear analyses. Finally, the stability criteria are extended to the cases when a coulomb friction type nonlinearity is included. 相似文献
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由于设计存在不足,波音737-300/500飞机液压系统串油是普遍现象。本文详细分析了各种串油故障的原因及其对应的故障现象和排故措施,并介绍了一起串油故障的排故过程。 相似文献
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国外航天运输系统防热系统,结构和材料的总体分析研究 总被引:6,自引:4,他引:6
对近年来国外航天运输系统包括飞船、航天飞机和空天飞机等的防热方案的选用方向、防热结构和防热材料的研究与应用以及发展方向进行了高度概括与分析,采用了新的分类方法,介绍了各种新型的防热系统、结构和材料。 相似文献
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机载机电系统可靠性的计算机辅助分析方法 总被引:1,自引:0,他引:1
为了提高机载机电系统的可靠性,机载机电系统常采用余度系统,以达到故障容错,进而实现整个飞机系统的高可靠性和安全性。开发适应于余度间耦合、动态性能降级的ReliaApp可靠性分析评价软件平台,通过有效综合故障模式影响(FMEA)、故障树分析(FTA)和Markov状态转移链法,实现不同容错设计方案的选择、机电系统的可靠性定量评价并给出系统的薄弱环节,为系统的余度配置和改进设计提供软件设计与评估平台,以确保飞机系统的高可靠性和安全性。实例应用表明该软件平台是飞机机载机电系统可靠性设计与评价有效的计算机辅助工具。 相似文献
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金属热防护系统设计的有限元分析 总被引:3,自引:0,他引:3
对可重复使用运载飞行器金属热防护系统进行了有限元分析,计算发现超耐热合金防热结构中下层蜂窝夹芯板的存在会增加结构的质量,但是并不会提高绝热性能,因此改进型防热系统取代了超耐热合金防热系统。比较分析了板间缝隙宽度和辐射率对防热结构底部最大温度的影响,表明减小板间缝隙是消除缝隙辐射的最好办法。分析了模拟条件对热防护系统尺寸设计的影响:初始温度为0℃时比为40℃时最大可以减少17%的厚度和7.7%的质量;考虑热损失厚度最小可以降低26%,质量最小可以降低7%。 相似文献
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以某型起动机为例,详细介绍了波音757飞机发动机起动机的常见故障及排放措施,为延长发动机寿命提供保证。音757飞机发动机的起动机是空气涡轮起动系统,由压缩空气驱动起动机涡轮,带动发动机高压压气机转子转动,达到起动发动机所需的速度。起动的气源可来自地面、APU和其他发动机,起动机由壳体、涡轮、减速齿轮、棘爪和输出轴组成,有进气口和排气口。起动机的维护与发动机的起动直接相关,它的故障一般会导致航班的延误或取消。下面就以HANMILTION起动机(P/N774984)为例,谈谈波音757飞机发动机起动机的故障及相关措施。起动… 相似文献
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Direction finding systems that use knowledge of only the aporoximate center frequency and bandwidth of the arriving signal and perform the azimuth estimate using the signal energy azimuthal distribution are of widespread interest. In this paper, a variety of such systems are considered. Their performances are analyzed and compared to each other and to a baseline optimal system. Particular attention is given to systems that will perform well against wideband signals in a low signal-to-noise environment. 相似文献