叶尖间隙微波测量系统前端研究

发布时间：2018-09-06 14:02

【摘要】：叶尖间隙是指发动机转子叶片尖端到发动机机匣的距离。叶尖间隙的实时测量技术在民用和军用的发动机研究和监控领域是非常重要的。减小叶尖间隙可以提高发动机的效率,降低能源的消耗,但是过小的间隙会给发动机的运行带来危险,在保证发动机安全的前提下,需要尽量减小叶尖间隙,故针对叶尖间隙的实时测量技术在发动机研究领域占据着重要的地位。本文首先介绍了目前常用的几种测量叶尖间隙的方法,通过分析对比发现微波测量技术可适用于叶尖间隙测量。然后本文分析了雷达前端的主要理论,研究了脉冲雷达收发前端的工作原理和主要结构,根据理论基础和指标要求,提出了脉冲雷达收发前端的总体设计方案,完成发射机和接收机中各模块电路的设计。本文提出了一种使用微波脉冲信号测量叶尖间隙的方法,利用了24GHz频率高,周期短的特点,发射两次脉冲信号(两次脉冲发射时分别有目标和无目标)。两次脉冲信号的间隔为N*T(T为载波周期,N为整数),比较两次接收回波的相位信息,通过信号处理得到叶尖间隙。课题的主要工作内容包括:首先,分析了雷达系统前端的主要基本理论,提出了总体设计方案和整体结构布局。其次,完成锁相源,脉冲信号源,滤波器和倍频模块的设计,并绘制各个电路模块的版图。然后,根据系统需要,选择合适的射频芯片,设计并绘制发射机和接收机的电路版图,确定电路布局和整体结构。最后,完成收发前端各电路模块的组装、调试和测试工作,对测试结果进行分析。
[Abstract]:Tip clearance is the distance from the tip of the rotor blade to the engine casing. The real-time measurement of tip clearance is very important in the field of civil and military engine research and monitoring. Reducing the tip clearance can improve the efficiency of the engine and reduce the energy consumption, but too small clearance will bring danger to the engine operation, under the premise of ensuring the safety of the engine, it is necessary to reduce the tip clearance as far as possible. Therefore, the real-time measurement technology for tip clearance plays an important role in the field of engine research. In this paper, several methods of measuring tip clearance are introduced. It is found that microwave measurement technology can be used to measure tip clearance. Then this paper analyzes the main theory of radar front end, studies the working principle and main structure of pulse radar transceiver front end, and puts forward the overall design scheme of pulse radar transceiver front end according to the theoretical basis and index requirements. Complete the design of each module circuit in transmitter and receiver. In this paper, a method of measuring tip clearance using microwave pulse signal is presented. The characteristics of high frequency and short period of 24GHz are used to transmit two pulse signals (target and no target respectively). The interval of the two pulse signals is N T (T is the integer of the carrier period N). The phase information of the two received echoes is compared and the tip clearance is obtained by signal processing. The main contents of this thesis are as follows: firstly, the basic theory of radar system front end is analyzed, and the overall design scheme and overall structure layout are proposed. Secondly, the phase-locked source, pulse signal source, filter and frequency doubling module are designed, and the layout of each circuit module is drawn. Then, according to the need of the system, the appropriate RF chip is selected, the circuit layout of transmitter and receiver is designed and drawn, and the circuit layout and overall structure are determined. Finally, the assembly, debugging and testing of the transceiver front-end circuit modules are completed, and the test results are analyzed.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN957

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