【摘要】：葉尖間隙是指發(fā)動(dòng)機(jī)轉(zhuǎn)子葉片尖端到發(fā)動(dòng)機(jī)機(jī)匣的距離。葉尖間隙的實(shí)時(shí)測(cè)量技術(shù)在民用和軍用的發(fā)動(dòng)機(jī)研究和監(jiān)控領(lǐng)域是非常重要的。減小葉尖間隙可以提高發(fā)動(dòng)機(jī)的效率,降低能源的消耗,但是過(guò)小的間隙會(huì)給發(fā)動(dòng)機(jī)的運(yùn)行帶來(lái)危險(xiǎn),在保證發(fā)動(dòng)機(jī)安全的前提下,需要盡量減小葉尖間隙,故針對(duì)葉尖間隙的實(shí)時(shí)測(cè)量技術(shù)在發(fā)動(dòng)機(jī)研究領(lǐng)域占據(jù)著重要的地位。本文首先介紹了目前常用的幾種測(cè)量葉尖間隙的方法,通過(guò)分析對(duì)比發(fā)現(xiàn)微波測(cè)量技術(shù)可適用于葉尖間隙測(cè)量。然后本文分析了雷達(dá)前端的主要理論,研究了脈沖雷達(dá)收發(fā)前端的工作原理和主要結(jié)構(gòu),根據(jù)理論基礎(chǔ)和指標(biāo)要求,提出了脈沖雷達(dá)收發(fā)前端的總體設(shè)計(jì)方案,完成發(fā)射機(jī)和接收機(jī)中各模塊電路的設(shè)計(jì)。本文提出了一種使用微波脈沖信號(hào)測(cè)量葉尖間隙的方法,利用了24GHz頻率高,周期短的特點(diǎn),發(fā)射兩次脈沖信號(hào)(兩次脈沖發(fā)射時(shí)分別有目標(biāo)和無(wú)目標(biāo))。兩次脈沖信號(hào)的間隔為N*T(T為載波周期,N為整數(shù)),比較兩次接收回波的相位信息,通過(guò)信號(hào)處理得到葉尖間隙。課題的主要工作內(nèi)容包括:首先,分析了雷達(dá)系統(tǒng)前端的主要基本理論,提出了總體設(shè)計(jì)方案和整體結(jié)構(gòu)布局。其次,完成鎖相源,脈沖信號(hào)源,濾波器和倍頻模塊的設(shè)計(jì),并繪制各個(gè)電路模塊的版圖。然后,根據(jù)系統(tǒng)需要,選擇合適的射頻芯片,設(shè)計(jì)并繪制發(fā)射機(jī)和接收機(jī)的電路版圖,確定電路布局和整體結(jié)構(gòu)。最后,完成收發(fā)前端各電路模塊的組裝、調(diào)試和測(cè)試工作,對(duì)測(cè)試結(jié)果進(jìn)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.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN957

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