本文選題：位移響應(yīng)重構(gòu)　切入點：離散奇異卷積法　出處：《中國科學(xué)技術(shù)大學(xué)》2014年博士論文　論文類型：學(xué)位論文

【摘要】：在工程研究分析中,為了對結(jié)構(gòu)進行健康監(jiān)測(Structural health monitoring, SHM)和結(jié)構(gòu)控制(Structural Control, SC),需要頻繁的測量結(jié)構(gòu)的動態(tài)響應(yīng)。在結(jié)構(gòu)的動態(tài)響應(yīng)中,動態(tài)位移可能包含有很多與結(jié)構(gòu)行為相關(guān)的重要信息,而這些信息可以用來對工程結(jié)構(gòu)進行健康監(jiān)測和結(jié)構(gòu)控制。在結(jié)構(gòu)健康監(jiān)測中,當(dāng)一個建筑物經(jīng)歷了較為嚴(yán)重的地震后,我們需要根據(jù)結(jié)構(gòu)的位移信息來判斷該建筑受到結(jié)構(gòu)損傷的可能性；同樣地,對于結(jié)構(gòu)控制來說,為了辨識系統(tǒng)的狀態(tài)我們需要知道結(jié)構(gòu)的實時或者近實時位移信息。傳統(tǒng)的接觸式傳感器在測量結(jié)構(gòu)的位移時需要固定的參考點。但是,對于大型結(jié)構(gòu)來說,參考點的選取非常困難,而且所選參考點在地震過程中是變化的。因此,在這種情境中運用傳統(tǒng)的接觸式傳感器直接進行位移測量幾乎是不可能的。 相比于位移,加速度的測量比較方便。在進行加速度測量時并不需要選取參考點,而且在市面上有很多可用于測量較寬動態(tài)頻率的加速度裝置。從這個角度上來說,相比于對工程結(jié)構(gòu)進行直接的位移測量,利用測得的結(jié)構(gòu)加速度來重構(gòu)系統(tǒng)的位移,似乎是一個很好獲取結(jié)構(gòu)動態(tài)響應(yīng)的方法。 文中基于離散奇異卷積法對位移響應(yīng)重構(gòu)進行研究,包括精確控制方程和傳遞函數(shù)的導(dǎo)出、基于逆問題控制方程和傳遞函數(shù)的導(dǎo)出、精確傳遞函數(shù)以及基于逆問題控制方程的傳遞函數(shù)基本特性以及基于離散奇異卷積的位移響應(yīng)重構(gòu)方法。在基于離散奇異卷積的位移響應(yīng)重構(gòu)方法研究中,著重分析了濾波器窗口尺寸的選取以及不同濾波器尺寸下基于離散奇異卷積的有限脈沖響應(yīng)濾波器的特性。最后,對提出的位移重構(gòu)方法進行仿真驗證和實驗驗證。仿真與實驗結(jié)果表明,基于離散奇異卷積的位移響應(yīng)重構(gòu)方法能夠有效的利用加速度數(shù)據(jù)重構(gòu)位移,且對噪聲具有較強的抑制能力。 加工過程中產(chǎn)生的加工誤差以及裝配過程中產(chǎn)生的裝配誤差都會對工程中機械裝置的機械性能產(chǎn)生影響,甚至?xí)䦟C械裝置產(chǎn)生毀滅性的損傷。因此,我們需要分析研究工程中機械裝置在加工及裝配過程中產(chǎn)生的誤差,以最大限度的降低這些誤差對工程中機械裝置機械性能的影響。 針對工程中由于加工誤差及裝配誤差可能產(chǎn)生的共振,提出了在機械產(chǎn)品設(shè)計階段或者結(jié)構(gòu)重設(shè)計階段,充分考慮加工誤差及安裝誤差對機械產(chǎn)品性能影響的設(shè)計思想,使最終成型的機械產(chǎn)品具有較強的魯棒性,并運用該方法對叉車方向盤結(jié)構(gòu)進行優(yōu)化,達到了抑制叉車方向盤怠速振動的目的；針對具有相同部件的平面連桿機構(gòu),提出了基于最小輸出位移方差和的尋找桿件最優(yōu)組合的方法,以最大限度的降低桿件加工誤差對連桿機構(gòu)輸出的影響,提高產(chǎn)品的性能,并將該方法成功運用于八連桿機械壓力機最優(yōu)桿組的確定問題中,求解出了最優(yōu)的八連桿桿組組合。
[Abstract]:In the engineering research and analysis, in order to structure health monitoring (Structural health monitoring SHM (Structural) and the structure of control Control, SC), dynamic measurement structure of frequent response. In the structural dynamic response, dynamic displacement may contain a lot of important information related to the behavior of the structure, and this information can be used to health monitoring and structure control of engineering structure. In structural health monitoring, when a building has experienced a serious earthquake, we need according to the displacement information structure to determine the building by the possibility of structural damage; similarly, the structure of control, in order to identify the state of the system we need to know the structure of the real time or near real-time displacement information. Conventional contact sensors need a fixed reference point in structural displacement measurement. However, for large structure The selection of reference points is very difficult, and the selected reference points are changing during the earthquake. Therefore, it is almost impossible to use traditional contact sensors to directly measure displacement in such a situation.
Compared to the displacement, the acceleration measurement is more convenient. The acceleration measurement does not need to select the reference point, and there are many acceleration apparatus can be used to measure a wide dynamic frequency in the market. From this point of view, compared to the engineering structure of direct displacement measurement, the measured displacement by the acceleration of the structure to the reconstruction of the system, seems to be a good method to obtain the dynamic response of structures.
The displacement response reconstruction is researched based on the discrete singular convolution method in this paper, including the control equation and transfer function is derived, the control equation and the transfer function of the inverse problem is derived based on the exact transfer function and transfer control equation of the inverse problem of the basic characteristics of function and response based on the discrete singular convolution reconstruction method based on displacement based on displacement. The response of the discrete singular convolution reconstruction method research, focuses on the analysis of the finite impulse response filter characteristics the discrete singular convolution based on the selected filter window size and different size of the filter. Finally, simulation and experimental verification of displacement reconstruction method is proposed. Simulation and experimental results show that the displacement response of the discrete singular convolution reconstruction method to effectively use the displacement acceleration data reconstruction based on, and has strong resistance to noise.
The assembling error of machining error produced during processing and assembly process will have an impact on the mechanical properties of engineering machinery, and even produce devastating damage to the mechanical device. Therefore, we need to analyze the error of mechanical engineering research device in the processing and assembly process, in order to reduce the maximum the impact of these errors on the engineering mechanical device performance.
According to the project due to resonance processing error and assembling error may arise, put forward in the mechanical product design stage or structure design stage, to fully consider the impact of design processing error and installation error of the mechanical properties of the product, the final molding machinery products with strong robustness, and the use of forklift steering wheel structure the optimization method, can suppress the vibration of the steering wheel speed; for planar linkage with the same components, propose a method to find the optimal combination of rod displacement based on the minimum output variance and, to reduce the effect of machining error bars on the linkage output, improve product performance, and this method was successfully applied to the eight link mechanical press rod group to determine the optimal solution, the eight connecting rod group optimal combination.

【學(xué)位授予單位】：中國科學(xué)技術(shù)大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TH161

【參考文獻】

相關(guān)期刊論文 前4條

1 魏宏;王慶霞;楊建國;雷顯武;;天線罩測量與修磨中位置安裝誤差分析與控制[J];機械設(shè)計與制造;2012年03期

2 黃安樂;;淺析機械加工誤差產(chǎn)生原因及消除措施[J];中國新技術(shù)新產(chǎn)品;2011年22期

3 李志農(nóng);何永勇;吳昭同;褚福磊;;ARMA模型盲辨識仿真研究及其在機械故障診斷中的應(yīng)用[J];振動與沖擊;2006年01期

4 李洪忠;平面連桿機構(gòu)的誤差分析[J];機械制造與自動化;2005年04期

，

本文編號：1648736