本文選題：DSP　切入點(diǎn)：FPGA　出處：《江蘇科技大學(xué)》2012年碩士論文　論文類型：學(xué)位論文

【摘要】：金屬焊接過(guò)程中，由于不均勻溫度場(chǎng)的存在，導(dǎo)致焊件不均勻膨脹與收縮，從而使焊件內(nèi)部產(chǎn)生焊接變形并產(chǎn)生焊接應(yīng)力。焊接應(yīng)力的存在直接影響金屬構(gòu)件的承載能力、降低焊接接頭及整個(gè)金屬構(gòu)件的疲勞強(qiáng)度，在遇到外力時(shí)，將會(huì)產(chǎn)生疲勞斷裂或脆性斷裂而引發(fā)事故。相關(guān)研究表明，頻率位于10kHz-100kHz的超聲波，，對(duì)焊接部位沖擊處理，可大幅度改善焊接部位薄弱的物理性質(zhì)。超聲波應(yīng)力消除機(jī)主電路是一個(gè)逆變電路，將市電50/60Hz變頻成10-100kHz，然后通過(guò)作功部件換能器，把電能轉(zhuǎn)換成震動(dòng)機(jī)械能，對(duì)外部沖擊處理。超聲波應(yīng)力消除機(jī)的功率較大時(shí)，換能器與超聲波電源容易脫離諧振狀態(tài)，換能器轉(zhuǎn)換效率降低甚至不工作，因此，該領(lǐng)域研究重心都放在頻率的跟蹤上，顯示部分比較簡(jiǎn)單，與現(xiàn)代大屏幕、彩色顯示相比落后。及時(shí)、準(zhǔn)確、多方位反映超聲波應(yīng)力消除機(jī)的工作狀態(tài)，主要是指應(yīng)力消除機(jī)輸出信號(hào)的波形狀況以及幅度、頻率、頻譜等至關(guān)重要的參數(shù)，便成為本課題研究需求的由來(lái)。 該設(shè)計(jì)采用DSP、FPGA兩種處理器，能夠完成波形數(shù)據(jù)的采集、存儲(chǔ)，電壓、頻率參數(shù)的測(cè)量，以及在7寸TFT-LCD上顯示。該電路系統(tǒng)架構(gòu)合理，資源豐富，可供進(jìn)一步開(kāi)發(fā)的空間較大，靈活性、兼容性較強(qiáng)，DSP主頻達(dá)到96MHz，F(xiàn)PGA主頻達(dá)160MHz，是一種高速的數(shù)據(jù)采集與處理電路系統(tǒng)。該電路大致工作過(guò)程：A/D轉(zhuǎn)換器通過(guò)多通道緩沖串行口(McBSP)與DSP交換數(shù)據(jù)；DSP根據(jù)這些數(shù)據(jù)計(jì)算顯示所需的位置信息，并將這些信息分批次傳給FPGA；FPGA有兩個(gè)功能，接收DSP送來(lái)的數(shù)據(jù)并合成寫(xiě)SRAM時(shí)序，以及從SRAM讀取數(shù)據(jù)并驅(qū)動(dòng)TFT-LCD。實(shí)驗(yàn)結(jié)果表明，該系統(tǒng)運(yùn)行狀況良好，基本達(dá)到了預(yù)期目標(biāo)。
[Abstract]:In the process of metal welding, the existence of inhomogeneous temperature field leads to uneven expansion and contraction of the welding piece, which results in welding deformation and welding stress inside the welding piece. The existence of the welding stress directly affects the bearing capacity of the metal member. When the fatigue strength of welded joints and the whole metal members is reduced, fatigue fracture or brittle fracture will occur when the external force is encountered. The related research shows that the ultrasonic wave with frequency between 10kHz and 100kHz can be used to deal with the impact on the welding site. The main circuit of ultrasonic stress relief machine is an inverter circuit, which converts 50 / 60 Hz of electric power to 10-100 kHz, and then converts electric energy into mechanical energy of vibration through the transducer of work parts. When the power of ultrasonic stress canceling machine is high, the transducer and the ultrasonic power supply are easy to escape from the resonant state, and the conversion efficiency of the transducer decreases or even does not work. Therefore, the focus of the research in this field is on the tracking of the frequency. The display part is relatively simple, compared with modern large screen and color display. Timely, accurate and multi-directional reflection of the working state of the ultrasonic stress eliminator, mainly refers to the waveform status, amplitude and frequency of the output signal of the stress eliminator. The essential parameters such as spectrum become the origin of the research demand of this subject. This design uses DSP FPGA two kinds of processors, can complete waveform data acquisition, storage, voltage, frequency parameter measurement, as well as display on 7-inch TFT-LCD. The circuit system structure is reasonable, rich in resources, and can be used for further development of large space. Flexibility, It is a high speed data acquisition and processing circuit system. The working process of the circuit is that: a / A / D converter exchanges data with DSP via multi-channel buffering serial port / DSP. Calculate and display the required location information, It has two functions: to receive the data from DSP and write SRAM timing, and to read data from SRAM and drive TFT-LCD. The experimental results show that the system is running well and has basically reached the expected goal.
【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TN873.93;TP368.12

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