【摘要】：功率超聲波理論研究的日趨完善,使得以此為基礎(chǔ)的多類型超聲波設(shè)備得到廣泛應(yīng)用。相對(duì)于傳統(tǒng)的化學(xué)粘合劑、熱熔等粘合方式,超聲波焊接作為一種新型焊接工藝優(yōu)勢(shì)明顯,而且環(huán)保無污染。超聲波驅(qū)動(dòng)電源作為超聲波焊接機(jī)中的重要組成部分,其功率調(diào)節(jié)能力和輸出振幅的穩(wěn)定性將直接影響焊接的質(zhì)量。文章基于控制理論,開展面向熱塑性材料點(diǎn)焊機(jī)的數(shù)控超聲波電源恒振幅控制策略及仿真的主要研究工作如下:(1)針對(duì)超聲波振動(dòng)設(shè)備中的核心部件——換能器的非線性現(xiàn)象和大功率同小信號(hào)下特性變化,依據(jù)等效電路展開機(jī)理分析,并通過實(shí)驗(yàn)得到帶負(fù)載壓電換能器的輸出振幅與環(huán)境溫度、輸入信號(hào)頻率、施加電壓的關(guān)系,為換能器機(jī)理建模提供現(xiàn)實(shí)依據(jù)。(2)針對(duì)壓電換能器在工作過程中存在的遲滯、蠕變等非線性特性,將換能器中電學(xué)參數(shù)表現(xiàn)為受到干擾的變值,依據(jù)換能器工作中力電轉(zhuǎn)換過程,建立壓電換能器與換能器換能機(jī)制的等效電路模型并轉(zhuǎn)化為微分方程,然后根據(jù)超聲波電源中逆變、整流和功率調(diào)整模塊的輸入輸出關(guān)系,得到整個(gè)換能機(jī)制的狀態(tài)空間方程。(3)依據(jù)所建立的壓電換能器的狀態(tài)空間模型,提出了基于魯棒控制理論的前饋控制算法。并結(jié)合系統(tǒng)模型的不確定信息,設(shè)計(jì)出符合要求的控制律,使得參數(shù)在有界擾動(dòng)下能有效保持系統(tǒng)的性能穩(wěn)定。為了避免由于模型中輸入偏差的累加造成計(jì)算量過大的問題提出了基于積分分離的PID算法。為了將非線性系統(tǒng)通過模糊辨識(shí)后用于自適應(yīng)控制,結(jié)合直接逆模型控制和迭代學(xué)習(xí)控制的思想對(duì)被控對(duì)象進(jìn)行參數(shù)辨識(shí)思想,建立了基于DFS-PI的控制算法。最后,論文對(duì)數(shù)字超聲波點(diǎn)焊機(jī)在緩變負(fù)載和突變負(fù)載條件下進(jìn)行測試,超聲波驅(qū)動(dòng)電源振幅穩(wěn)定性能達(dá)到期望,驗(yàn)證了所提出控制策略的有效性。
[Abstract]:With the improvement of power ultrasonic theory, the multi-type ultrasonic equipment based on it has been widely used. Compared with the traditional bonding methods such as chemical adhesive and hot melt, ultrasonic welding is a new welding technology with obvious advantages, and environmental protection and no pollution. As an important part of ultrasonic welding machine, the power regulation ability and the stability of output amplitude of ultrasonic power supply will directly affect the quality of welding. Based on the control theory, The main research work of numerical control ultrasonic power supply for thermoplastic material spot welder is as follows: (1) aiming at the nonlinear phenomenon of transducer, the key component of ultrasonic vibration equipment is discussed. The characteristic change of high power and small signal, Based on the analysis of the equivalent circuit expansion mechanism, the relationship between the output amplitude of the loaded piezoelectric transducer and the ambient temperature, input signal frequency and applied voltage is obtained through experiments. It provides a practical basis for the modeling of transducer mechanism. (2) in view of the nonlinear characteristics of piezoelectric transducer such as hysteresis, creep and so on, the electrical parameters in the transducer are represented as disturbed variable values. The equivalent circuit model of piezoelectric transducer and transducer energy transfer mechanism is established and transformed into differential equation according to the process of electro-force conversion in transducer operation. Then according to the input and output relation of inverter, rectifier and power adjustment module in ultrasonic power supply, the equivalent circuit model of piezoelectric transducer and transducer energy transfer mechanism is established and transformed into differential equation. The state space equation of the whole energy transfer mechanism is obtained. (3) based on the state space model of piezoelectric transducer, a feedforward control algorithm based on robust control theory is proposed. Combined with the uncertain information of the system model, a control law that meets the requirements is designed, so that the parameters can effectively maintain the performance stability of the system under bounded disturbance. In order to avoid the problem of excessive computation caused by the accumulation of input deviations in the model, a PID algorithm based on integral separation is proposed. In order to apply the nonlinear system to adaptive control after fuzzy identification and combining the idea of direct inverse model control and iterative learning control, the control algorithm based on DFS-PI is established. Finally, the digital ultrasonic spot welding machine is tested under the condition of slow load and sudden load. The amplitude stability performance of the ultrasonic drive power is up to expectations, and the effectiveness of the proposed control strategy is verified.
【學(xué)位授予單位】：杭州電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TP273;TB552

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 廖曉輝;王曉偉;;基于模糊PI控制的超聲波換能器諧振頻率跟蹤系統(tǒng)仿真[J];河南科學(xué);2015年03期

2 邢秀琴;鄭愛國;葉志忠;祝錫晶;;基于人工神經(jīng)網(wǎng)絡(luò)的超聲加工振幅控制的研究[J];機(jī)床與液壓;2015年05期

3 廖平;劉純亮;;全橋移相鑄軋超聲波電源調(diào)功系統(tǒng)設(shè)計(jì)[J];電源學(xué)報(bào);2014年05期

4 徐曉明;張向慧;;旋轉(zhuǎn)超聲換能器的建模與仿真[J];機(jī)械工程師;2014年04期

5 杜世杰;沈清波;;基于T-S模糊模型的辨識(shí)與控制[J];工業(yè)儀表與自動(dòng)化裝置;2011年01期

6 譚先吉;楊濤;馮月暉;劉婷婷;韓賓;;基于有限元的懸臂梁式壓電換能器的模型辨識(shí)[J];系統(tǒng)仿真學(xué)報(bào);2011年01期

7 王常斌;符顯峰;張強(qiáng);毛波;郝明;;大功率超聲波處理技術(shù)的發(fā)展與展望[J];大慶石油地質(zhì)與開發(fā);2009年06期

8 郭林偉;林書玉;許龍;;壓電換能器靜態(tài)匹配電路的研究[J];紡織高校基礎(chǔ)科學(xué)學(xué)報(bào);2008年03期

9 劉榮光;李曉謙;胡仕成;蔣日鵬;;超聲振動(dòng)系統(tǒng)導(dǎo)納特性與聲場指向性研究[J];振動(dòng)與沖擊;2008年07期

10 周淼磊;楊志剛;田彥濤;高巍;程光明;曲興田;;壓電執(zhí)行器非線性控制方法研究進(jìn)展[J];壓電與聲光;2007年06期

相關(guān)碩士學(xué)位論文 前10條

1 胥文濤;超聲波生物處理系統(tǒng)的建模與H∞控制研究[D];江南大學(xué);2015年

2 席維;超聲縫紉機(jī)芯的研究與設(shè)計(jì)[D];杭州電子科技大學(xué);2015年

3 陳洪歡;大功率數(shù)字式超聲電源設(shè)計(jì)[D];杭州電子科技大學(xué);2015年

4 冷強(qiáng);高精度超聲波測距方法與裝置的研究[D];華北電力大學(xué);2015年

5 倪正龍;大功率高頻超聲波生物處理系統(tǒng)的控制研究[D];江南大學(xué);2014年

6 焦曉陽;超聲駐波懸浮及材料無容器處理研究[D];吉林大學(xué);2012年

7 包為剛;基于非對(duì)稱式自動(dòng)穩(wěn)速控制方法的超聲波電源研制[D];哈爾濱工業(yè)大學(xué);2011年

8 曾惠霞;超聲波塑料焊接機(jī)功率發(fā)生器的研究與實(shí)現(xiàn)[D];華南理工大學(xué);2009年

9 張磊磊;大功率超聲清洗電源的研制[D];蘭州理工大學(xué);2009年

10 趙小強(qiáng);基于嵌入式技術(shù)的智能測房儀的研究[D];天津理工大學(xué);2009年

，

本文編號(hào)：2318832