基于希尔伯特变换的信号解调算法及其在飞机供电特性参数测试系统中的应用

电压调制幅度、频率调制幅度和畸变频谱是对飞机机载电源系统供电特性参数进行测试时与信号调制相关的重要参数。为了更好地测试这些参数,提出了一种基于希尔伯特变换原理的数字解调算法,可以将采集的幅度或频率调制信号进行解调分析;同时,构建了一套飞机供电特性参数测试系统,将解调程序与硬件设备结合,通过程序控制数据采集卡对机载电源信号采样与解调分析;设计了实验对波形发生器产生的调制信号进行采样与解调,验证了该系统具有良好的效果,可以应用于飞机供电特性参数的测试中。     

一种机载XGA视频信息采集的设计与实现

现代飞机的视频显示系统在机载电子系统中占有越来越重要的地位,具有高分辨率、高品质、大容量、多路抽引的新特点。XGA作为一种数字视频技术,在现代飞机的视频显示系统中得到了广泛应用。本文首先简单介绍了XGA视频信号的特点,其将行场同步信号通过特定变换转换成为共模信号叠加到R、G、B差分信号上。针对这一特点,采用模块化设计思路,实现了对XGA视频信号的采集。     

飞机火警探测模拟演示系统设计

火警探测系统是飞机系统的重要组成部分,本文设计了基于A320飞机的火警探测模拟演示系统,采用开关或检测传感器两种方式模拟火警信号,以单片机作为火警信号的处理器,采用语音、显示屏显示及灯光等信号作为报警方式。文章还设计了基于A320火警探测及报警原理的运行控制程序,最后实物制板,模拟演示A320的火警探测系统的运行。     

飞机电源试验台电气参数测试系统基准电压信号源设计与实现

为了实现对飞机电源试验台电气参数测试系统计量校准的需求,研制了一种以STM32微控制器为核心,用于校准飞机电源试验台电气参数测试系统的基准电压信号源.该基准电压信号源能够输出范围为±10 V,最小步长为0.019 mV,量化误差为9.5μV,且幅值可调的高精度电压信号.实验测试结果表明,基准电压源能够输出幅值、周期持续时间和波形参数都满足校准要求的信号.由该基准电压信号源构成的校准设备不仅能够满足飞机电源试验台电气参数测试系统测量准确性和溯源性的计量校准要求,还能够大幅提升飞机电源试验台电气参数测试系统的校准效率.     

基于某大型飞机稳定裕度试飞的激励信号研究

随着电传飞机的出现,气动伺服弹性试飞及飞控稳性试飞成为必然.因此,如何在飞机的伺服控制系统中加入适合的激励信号,以计算出准确的稳定裕度,成为稳定裕度科目试飞的关键.某大型飞机飞控系统复杂,可借鉴经验少,传统的颤振激励系统信号生成方法无法保障气动伺服弹性试飞及飞控稳定性试飞.经过研究,设计出了与其飞控系统相匹配的激励信号,满足了该型飞机的气动伺服弹性及飞控稳定性试飞,并为后续其他型号的ASE及飞控稳定性试飞奠定了基础,节约了飞行试验成本.     

飞机270 V直流电源供电特性参数校准方法实现与验证

针对飞机270 V直流电源供电特性测试系统的校准需求,结合GJB 5189-2003《飞机供电特性参数测试方法》等相关标准,完成测试系统的校准项目和校准方法研究,并基于LabVIEW平台编写校准程序,实现了标准信号的生成和采集;基于直接数据合成、宽带精密放大和宽带分压等技术研制了测试系统的校准装置,形成校准系统,实现了...     

新支线飞机供电系统航电接口仿真器设计

为了满足新支线飞机ARJ21供电系统地面独立试验的需要,设计了用于模拟航空电子系统、发动机系统等与电气系统之间相关接口功能的仿真器,为电气系统提供其它飞机系统的仿真信号并指示供电系统的运行状态.为验证供电系统的各项性能提供支持.实际运行结果表明在新支线飞机ARJ21供电系统的12种状态下仿真器对导光板和供电系统的控制逻辑正确,对电源系统简图页和EICAS信息指示合理,通过ARINC429总线与各发电机控制器的通信正常,各项功能与飞机系统设计一致,完全能够满足飞机供电系统综合试验的要求.     

用于飞机供电特性测试系统校准的波峰系数信号产生方法研究

为实现飞机供电特性测试系统对交流电压波峰系数测量性能的校准,保障飞机供电特性测试系统对该项参数测试结果的准确性,研究了采用可编程电源配合相关硬件设备模拟产生具有指定波峰系数的交流电压信号的方法。针对其在飞机供电特性测试系统校准中应用的问题,提出了抛物线拟合法产生具有指定波峰系数的交流电压信号方法。通过实际测量分析,验证了抛物线拟合法模拟产生的交流电压信号的波峰系数具有更高的准确性,更适用于实现飞机供电特性测试系统对交流电压波峰系数测量性能的校准。     

飞机直流供电特性测试系统畸变频谱参数校准方法

通过对飞机直流供电特性测试系统校准装置的畸变频谱信号产生原理进行介绍,并依据JJF 1059.1-2012《测量不确定度评定与表示》对飞机直流供电特性测试系统校准装置直流电压畸变频谱进行不确定度来源分析,给出了直流电压畸变频谱不确定度的具体评价方法。最终,按照上述不确定度评价方法对飞机直流供电特性测试系统校准装置直流电压畸变频谱不确定度进行了评定。     

飞行数据管理仿真系统软件设计及实现

利用飞行数据驱动测试仪器模拟实际飞机飞行时产生的各种模拟量、离散量和总线信号,在实现了基于多种测试总线仪器的系统硬件平台的基础上,从实际软件需求出发,阐述了系统软件架构和应用程序层次结构,并详细介绍了系统软件设计及实现过程中的系统硬件资源模型化、可配置通用飞参解译、基于最小二乘曲线拟合的直流信号误差补偿、多线程编程等关键技术.     

神光III强激光能源模块参数设计与保护策略

介绍了神光III预研计划能源模块电路设计方法及参数选择原则 ,详细分析了电源系统可能存在的各种故障情况 ,在此基础上提出了电源系统故障保护的方法和对策 ,这对于电源系统的设计和安全运行具有十分重要的意义。实验结果表明 ,所研制的脉冲电源满足系统要求。     

Materials selection in design of structures and engines of supersonic aircrafts: A review

This article reviews the advances in the materials selection for applications in structures and engines of current and future supersonic aircrafts. A brief overview of configuration design of the supersonic aircrafts is first given; which also includes techniques to improve configuration design for future supersonic aircrafts. The operating and ambient environmental conditions during supersonic flight and the resulting material requirements have been discussed; and consequently various aerospace aluminum alloys, titanium alloys, superalloys, and composites have been recommended. Finally, a new materials-selection chart is presented that would enable aerospace designers to select appropriate materials for application in high-performance current and future supersonic/hypersonic aircrafts.     

Final design of an air core, compulsator driven, 60 caliber railgunsystem

The manufacturing phase of a laboratory-based small-caliber electromagnetic (EM) launcher and compulsator power supply is discussed. The objective of the 29-month program is to develop a compact, lightweight test bed capable of accelerating 32 g masses to 2 km/s at a rate of 10 Hz. Both the power supply and launcher feature significant component design advances which will allow the system to operate at considerably higher energy and power densities than previously demonstrated. The 750 kg compulsator will generate 2.2 kV and the silicon-controlled rectifier (SCR) switch will commutate 386 kA pulses into the 1.6-m long, 0.60 caliber augmented solid armature railgun. The final design and predicted operating characteristics of the compulsator system are described. Overall system performance parameters are reported, including results from the optimization code used to aid in the design of the compulsator system. A system design overview is presented, with emphasis on new materials and state-of-the-art machine components to be used for the first time in a compulsator     

新型高功率因体激光器电源

用旋转磁通压缩脉冲发电机作为高功率固体激光器电源是一条新的技术路线,该类电源具有小型、机动、灵活、可靠、寿命长等特点。本文通过比较了各种类型脉冲电源的性能指标,解释了旋转磁通压缩、串级、自激、偏极与双机同壳等原理,给出电机的设计公式和一１０ＭＷ串级主动旋转磁通压缩脉冲发电机的设计与实验结果。     

Reliability evaluation of generating systems containing wind power and energy storage

Global environmental concerns associated with conventional energy generation have led to the rapid growth of wind energy in power systems. Many jurisdictions around the world have set high wind penetration targets in their energy generation mix. Wind speed is variable in nature, and power output from a wind farm is not readily controllable. High wind penetration can lead to high-risk levels in power system reliability and stability. In order to maintain the system stability, wind energy dispatch is usually restricted and energy storage is considered to smooth out the fluctuations and improve supply continuity. The benefits from using energy storage are highly dependent on the operating strategies associated with wind and storage in the power system. A simulation technique that can consider wind farm and energy storage operating strategies is presented. Different operating strategies are compared and the resulting benefits are evaluated. The system impacts of energy storage capacity and operating constraints, wind energy dispatch restrictions, wind penetration level and wind farm location on the reliability benefits from energy storage are illustrated.     

同步发电机励磁系统中PWM控制的仿真研究

优良的励磁控制系统不仅可以保证发电机运行的可靠性和稳定性，而且可有效地提高发电机和电力系统技术指标。同步发电机励磁系统采用了PWM整流技术，实现励磁电流低谐波和励磁功率单元高功率因数转换，提高了发电机供电质量，并用MATLAB对设计系统做出仿真验证，证明该设计对改善发电机输出电压、提高功率单元电能利用率有明显效果。     

光蓄互补系统接入对配电网供电可靠性的影响

光蓄互补系统接入对配网的供电可靠性有较大影响.首先,介绍了典型系统的负荷曲线和光伏出力曲线特点,以及储能运行策略、配网供电可靠性评估指标和评估方法;然后,讨论了不同出力光伏系统、不同容量储能和光蓄互补系统接入对负荷曲线和配网供电可靠性的影响.最后,比较并分析了光伏、储能和光蓄互补系统对配电网供电可靠性的不同影响.研究结果可为光蓄互补系统的容量优化配置提供参考.     

嵌入式相电检测及相序调整系统设计

针对许多行业有三相电相序与安全生产的要求,设计了基于32位ARM9处理器芯片S3C2410X的嵌入式系统,并移植了Linux操作系统来提高系统多任务与实时响应能力.介绍了该系统各硬件模块设计和软件设计流程,硬件模块由相电检测、相序调整、人机交互及TC35i报警等模块构成.该系统可对"三相四线制"供电端口进行相电检测与相序调整,在出现异常时执行报警操作并短信或者电话通知到负责人员,可应用于压缩机、风机和三相电机等装置的供电,特别适用于大型的移动供配电设备.     

基于GPIB的电源自动测试系统的设计

介绍了基于GPIB总线技术的电源参数自动测试系统,详细阐述了系统的硬件组成和软件编程。该系统不仅具有高的测量效率和测量精度等优点,而且结构灵活、可扩展性好,满足各种电源的测试要求,经使用验证,可应用于实际生产中。     

Multi-state reliability assessment for shipboard hybrid turbine-diesel generation system with redundancy and aging effects

Complex system structures, dynamic energy demands, and tough operating environment pose a huge challenge to reliability assessment and risk control. Taking multi-state, redundant structure and aging impact into account, reliability assessment for shipboard hybrid turbine-diesel generation system is studied. This work adopts a comprehensive method combining the Markov method and universal generating function (UGF): the Markov method is used for reliability modeling at the unit level, and then synthesized and calculated through UGFs to obtain system-level reliability. Based on the above methodology, this work presents a multi-state system (MSS) model with different configuration structures and failure rate types, then compares the availability evaluation results of the single power generation system, the hybrid power system with redundancy and aging effects. The results show that (1) redundant design effectively improves system availability to meet power supply requirements; (2) in the case of system aging and imperfect repair, redundant configuration and power distribution can significantly improve the availability of power supply to be almost unaffected by aging, and effectively reduce the risk of performance failure; and (3) when the redundancy is applied, the system power supply availability is not sensitive in the high-value range of the redundant installed capacity ratio, but sensitive in the high-value range of effective coefficient about power compensation control.