【摘要】：力學(xué)環(huán)境試驗(yàn)是產(chǎn)品研制過(guò)程中的重要環(huán)節(jié),為產(chǎn)品的設(shè)計(jì)修改及優(yōu)化設(shè)計(jì)提供決策信息,其中,振動(dòng)環(huán)境試驗(yàn)是力學(xué)環(huán)境試驗(yàn)中的重要內(nèi)容。振動(dòng)環(huán)境試驗(yàn)通過(guò)在試驗(yàn)室內(nèi)模擬產(chǎn)品在實(shí)際工況下承受的振動(dòng)環(huán)境和環(huán)境效應(yīng),鑒定產(chǎn)品的環(huán)境適應(yīng)性,驗(yàn)證產(chǎn)品的機(jī)械、電氣性能是否符合設(shè)計(jì)要求。傳統(tǒng)的單點(diǎn)單軸振動(dòng)試驗(yàn)方法不能提供足夠的推力且無(wú)法模擬產(chǎn)品真實(shí)的多維振動(dòng)環(huán)境,因此,多點(diǎn)多軸振動(dòng)試驗(yàn)方法被普遍認(rèn)為是一種更為有效的振動(dòng)試驗(yàn)方法。多軸液壓振動(dòng)試驗(yàn)系統(tǒng)不僅可以實(shí)現(xiàn)多個(gè)激勵(lì)點(diǎn)在單個(gè)或多個(gè)軸向上的振動(dòng)試驗(yàn)方式,同時(shí),可以滿足大推力、大位移、低頻響的振動(dòng)試驗(yàn)要求。本文圍繞液壓振動(dòng)試驗(yàn)控制系統(tǒng)關(guān)鍵技術(shù)展開(kāi)研究,重點(diǎn)研究了控制系統(tǒng)的相關(guān)控制算法,并將其應(yīng)用于多軸液壓振動(dòng)試驗(yàn)系統(tǒng)的控制試驗(yàn)中,取得較好的控制效果。液壓振動(dòng)試驗(yàn)系統(tǒng)三參量伺服控制技術(shù)研究。伺服控制部分是液壓振動(dòng)試驗(yàn)系統(tǒng)控制的基本組成部分,是液壓振動(dòng)試驗(yàn)系統(tǒng)完成復(fù)雜振動(dòng)控制功能的基礎(chǔ)。在對(duì)液壓振動(dòng)試驗(yàn)系統(tǒng)深入研究基礎(chǔ)上,針對(duì)液壓振動(dòng)試驗(yàn)系統(tǒng)阻尼小、存在油柱共振峰等問(wèn)題,研究設(shè)計(jì)了一種三參量伺服控制策略,實(shí)現(xiàn)對(duì)液壓振動(dòng)試驗(yàn)系統(tǒng)頻響特性的有效校正：(1)三參量反饋控制環(huán)節(jié)可以有效擴(kuò)展系統(tǒng)的頻寬,提高系統(tǒng)的阻尼比；(2)三參量前饋控制環(huán)節(jié)通過(guò)消除試驗(yàn)系統(tǒng)中距離虛軸較近的極點(diǎn),實(shí)現(xiàn)系統(tǒng)頻寬的進(jìn)一步擴(kuò)展。在三參量伺服控制研究基礎(chǔ)上,重點(diǎn)研究了一種快速三參量控制參數(shù)整定方法,實(shí)現(xiàn)三參量伺服控制的快速參數(shù)整定。多軸液壓振動(dòng)試驗(yàn)系統(tǒng)辨識(shí)方法研究。多軸液壓振動(dòng)試驗(yàn)系統(tǒng)是一個(gè)多輸入多輸出振動(dòng)試驗(yàn)系統(tǒng),通過(guò)對(duì)系統(tǒng)時(shí)域建模方法與頻域建模方法進(jìn)行對(duì)比研究,指出頻域建模方法由于不需要事先確定系統(tǒng)的具體結(jié)構(gòu),穩(wěn)定性好,更適合多輸入多輸出振動(dòng)試驗(yàn)系統(tǒng)的模型辨識(shí)。研究系統(tǒng)在存在干擾噪聲情況下,干擾噪聲對(duì)系統(tǒng)辨識(shí)效果的影響,指出系統(tǒng)在存在干擾噪聲的情況下,傳統(tǒng)的H1、H1、H3等頻響函數(shù)估計(jì)方法均是對(duì)系統(tǒng)的有偏估計(jì),而Hv估計(jì)方法則是對(duì)試驗(yàn)系統(tǒng)的無(wú)偏估計(jì),相對(duì)于傳統(tǒng)的H1、H1、H3估計(jì)方法,通過(guò)采用Hv估計(jì)方法,可以有效抑制系統(tǒng)干擾噪聲對(duì)系統(tǒng)辨識(shí)過(guò)程的影響,提高對(duì)試驗(yàn)系統(tǒng)的辨識(shí)精度。多軸液壓振動(dòng)試驗(yàn)系統(tǒng)振動(dòng)控制算法研究。在系統(tǒng)振動(dòng)控制過(guò)程中,為實(shí)現(xiàn)對(duì)多軸液壓振動(dòng)試驗(yàn)系統(tǒng)的有效控制,消除干擾噪聲等非線性因素對(duì)系統(tǒng)控制的影響,重點(diǎn)研究了一種頻域X-濾波LMS自適應(yīng)逆控制算法,并將其應(yīng)用到多軸液壓振動(dòng)試驗(yàn)系統(tǒng)的功率譜復(fù)現(xiàn)和時(shí)域波形復(fù)現(xiàn)控制過(guò)程中,提出基于頻域X-濾波LMS自適應(yīng)逆控制的系統(tǒng)功率譜復(fù)現(xiàn)和時(shí)域波形復(fù)現(xiàn)控制算法。同時(shí),通過(guò)對(duì)沖擊振動(dòng)試驗(yàn)的研究,為更加真實(shí)的模擬產(chǎn)品在沖擊試驗(yàn)過(guò)程中可能承受的隨機(jī)信號(hào),提出并實(shí)現(xiàn)一種基于頻域X-濾波LMS自適應(yīng)逆控制算法的隨機(jī)沖擊控制策略�？刂葡到y(tǒng)實(shí)現(xiàn)及試驗(yàn)。重點(diǎn)介紹了液壓振動(dòng)試驗(yàn)系統(tǒng)中液壓伺服控制器和多軸振動(dòng)控制器的功能及硬件組成,并選用一套雙臺(tái)并激液壓振動(dòng)試驗(yàn)系統(tǒng)作為具體試驗(yàn)對(duì)象,首先進(jìn)行三參量伺服控制試驗(yàn),試驗(yàn)結(jié)果表明：采用快速三參量控制參數(shù)整定算法可以實(shí)現(xiàn)對(duì)液壓振動(dòng)試驗(yàn)系統(tǒng)三參量伺服控制的快速參數(shù)整定,且控制參數(shù)對(duì)試驗(yàn)系統(tǒng)具有較好的頻響改善效果；另一方面,在三參量伺服控制基礎(chǔ)上,對(duì)試驗(yàn)系統(tǒng)進(jìn)行基于頻域X-濾波LMS自適應(yīng)逆控制策略的功率譜復(fù)現(xiàn)、時(shí)域波形復(fù)現(xiàn)、隨機(jī)沖擊等類型試驗(yàn),試驗(yàn)結(jié)果表明：控制策略對(duì)雙臺(tái)并激振動(dòng)試驗(yàn)系統(tǒng)具有較好的實(shí)際控制效果,相關(guān)的試驗(yàn)指標(biāo)完全可以滿足工程試驗(yàn)要求,進(jìn)一步證明控制策略的有效性、可靠性。
[Abstract]:Mechanical environment test is an important link in the process of product development, providing decision-making information for design modification and optimization design of product, in which vibration environment test is an important part of mechanical environment test. The vibration environment test verifies the environmental adaptability of the product by simulating the vibration environment and the environmental effect of the product under actual working conditions, and verifies whether the mechanical and electrical properties of the product meet the design requirements. The traditional single-axis vibration test method can not provide enough thrust and can not simulate the true multi-dimensional vibration environment of the product, so the multi-point multi-axis vibration test method is widely regarded as a more effective vibration test method. The multi-shaft hydraulic vibration test system not only can realize the vibration test mode of a plurality of excitation points on a single or multiple shafts, but also can meet the vibration test requirements of large thrust, large displacement and low frequency response. In this paper, the key technology of hydraulic vibration test control system is studied, the relevant control algorithm of the control system is studied, and it is applied to the control experiment of the multi-axis hydraulic vibration test system, and the better control effect is obtained. Research on three-parameter servo control technology of hydraulic vibration test system. The servo control part is the basic component of the hydraulic vibration test system control, and it is the foundation of the hydraulic vibration test system to complete the complex vibration control function. Based on the deep research on hydraulic vibration test system, aiming at the problems of small damping and oil column resonance peak in hydraulic vibration test system, a three-parameter servo control strategy was designed to correct the frequency response characteristic of hydraulic vibration test system. (1) the three-parameter feedback control link can effectively extend the bandwidth of the system and improve the performance of the system; (2) the three-parameter feedforward control link realizes the further expansion of the bandwidth of the system by eliminating the pole which is closer to the virtual axis in the test system. On the basis of three-parameter servo control research, a fast three-parameter tuning method is emphatically studied, and the fast parameter setting of three-parameter servo control is realized. Research on identification method of multi-axis hydraulic vibration test system. The multi-axis hydraulic vibration test system is a multi-input multi-output vibration test system. By contrast research on the system time domain modeling method and the frequency domain modeling method, it is pointed out that the frequency domain modeling method has good stability due to the need not to determine the specific structure of the system in advance, More suitable for model identification of multi-input multi-output vibration test system. In the presence of interference noise, the influence of interference noise on the identification effect of the system is studied. It is pointed out that in the presence of interference noise, the traditional frequency response function estimation method of H1, H1, H3 is the partial estimation of the system. The Hv estimation method is the unbiased estimate of the test system. Compared with the traditional H1, H1 and H3 estimation methods, by adopting the Hv estimation method, the influence of the system interference noise on the system identification process can be effectively inhibited, and the identification precision of the test system is improved. Research on vibration control algorithm of multi-axis hydraulic vibration test system. In the process of system vibration control, in order to realize the effective control of the multi-axis hydraulic vibration test system and eliminate the influence of nonlinear factors such as interference noise on the system control, a frequency domain X-filter LMS adaptive inverse control algorithm is emphatically studied. In this paper, a system power spectral recurrence and time domain waveform recurrence control algorithm based on frequency domain X-filter LMS adaptive inverse control is proposed in the process of power spectrum reproduction and time domain waveform reproduction control of multi-axis hydraulic vibration test system. At the same time, a random impact control strategy based on frequency domain X-filter LMS adaptive inverse control algorithm is proposed and implemented for the research of impact vibration test. Realization and test of control system. The function and hardware composition of hydraulic servo controller and multi-axis vibration controller in hydraulic vibration test system are introduced, and a set of dual-stage and exciting hydraulic vibration test system is selected as the specific test object, and then the three-parameter servo control test is carried out. The test results show that: The fast parameter setting of three-parameter servo control of the hydraulic vibration test system can be realized by adopting the fast three-parameter control parameter whole algorithm, and the control parameters have better frequency response improvement effect on the test system; on the other hand, on the basis of the three-parameter servo control, Based on the frequency domain X-filter LMS adaptive inverse control strategy, the test results show that the control strategy has better practical control effect on the double-stage and shock-excited vibration test system. The relevant test indexes can meet the engineering test requirements and further prove the validity and reliability of the control strategy.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB535

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