發(fā)布時(shí)間：2018-06-19 12:11

  本文選題：損傷識別 + 模型修正��； 參考：《南昌大學(xué)》2016年碩士論文

【摘要】：在運(yùn)行過程中,水閘閘基受到水流作用,容易出現(xiàn)脫空現(xiàn)象,進(jìn)而導(dǎo)致不均勻沉陷、泥沙淘空等病害,建在軟基或砂基上的水閘,閘基脫空現(xiàn)象更為明顯。同時(shí),由于位于水下的閘基脫空現(xiàn)象在安全檢查中難以發(fā)現(xiàn),安全隱患不易及時(shí)被發(fā)現(xiàn)。因此,研究有效的軟基水閘閘基脫空區(qū)域檢測方法對于保障水工結(jié)構(gòu)的安全運(yùn)行具有十分重要的意義和價(jià)值。本文的具體研究內(nèi)容如下:(1)參考工程資料,利用ANSYS建立殼體單元水閘模型,將軟基水閘閘基脫空區(qū)域進(jìn)行參數(shù)化描述。通過分析不同脫空形式下水閘結(jié)構(gòu)振動(dòng)特征,提出振動(dòng)模式分類方法,針對每一類振動(dòng)模式建立脫空參數(shù)與結(jié)構(gòu)模態(tài)參數(shù)之間的高精度響應(yīng)面方程。對比響應(yīng)面模型的計(jì)算值與實(shí)測結(jié)構(gòu)模態(tài)(數(shù)值模擬),調(diào)整閘基脫空參數(shù),使得響應(yīng)面模型的計(jì)算值與實(shí)測值盡量接近,修正后的脫空參數(shù)即可指示水閘閘基脫空區(qū)域。基于殼體單元模型的研究分析,驗(yàn)證了閘基脫空區(qū)域識別方法的可行性。(2)為了更加符合實(shí)際工程,建立實(shí)體單元水閘有限元模型,相比于殼體模型,實(shí)體模型的結(jié)構(gòu)動(dòng)力特性更加符合實(shí)際�；贏NSYS的結(jié)構(gòu)模態(tài)分析,建立結(jié)構(gòu)固有頻率、振型與閘基脫空參數(shù)之間的響應(yīng)面方程,利用模態(tài)信息構(gòu)建目標(biāo)函數(shù),基于遺傳算法對實(shí)體單元水閘閘基脫空區(qū)域進(jìn)行識別研究。(3)為了提高識別算法的魯棒性,提出了基于位移統(tǒng)計(jì)矩的水閘閘基脫空區(qū)域識別方法。利用ANSYS有限元軟件對水閘模型進(jìn)行時(shí)程計(jì)算分析,提取響應(yīng)信息,計(jì)算位移統(tǒng)計(jì)矩,建立統(tǒng)計(jì)矩特征參數(shù)與脫空參數(shù)之間的函數(shù)關(guān)系,進(jìn)而利用實(shí)測值(數(shù)值模擬)與計(jì)算值構(gòu)建目標(biāo)函數(shù),通過求解優(yōu)化問題反演水閘閘基脫空參數(shù)。數(shù)值模擬分析表明,基于模態(tài)信息的水閘閘基脫空區(qū)域識別方法,能很好的指示閘基脫空區(qū)域,且隨著噪聲級別的提高,識別結(jié)果會逐漸變差。與之相比,基于統(tǒng)計(jì)矩的水閘閘基脫空區(qū)域識別方法具有較好的魯棒性,在噪聲級別較大的情況下,識別結(jié)果依然能夠較好的指示脫空區(qū)域。
[Abstract]:In the course of operation, the sluice foundation is affected by the flow of water, and it is easy to appear the phenomenon of void, which leads to uneven subsidence, sediment scouring and other diseases. The sluice built on the soft foundation or sand foundation is more obvious. At the same time, it is difficult to find the hidden danger in safety inspection because of the phenomenon of underwater sluice base clearance. Therefore, it is of great significance and value to study the effective detection method for the clearance area of the soft foundation sluice for ensuring the safe operation of the hydraulic structure. The concrete research contents of this paper are as follows: (1) with reference to engineering data, the shell element sluice model is established by ANSYS, and the void area of soft foundation sluice is parameterized. By analyzing the vibration characteristics of sluice structures in different emptying forms, a vibration mode classification method is proposed, and a high-precision response surface equation between the emptying parameters and the structural modal parameters is established for each type of vibration mode. Comparing the calculated value of response surface model with the measured structural modal (numerical simulation, adjusting the parameters of sluice foundation emptying, the calculated value of response surface model is as close as possible to the measured value, and the modified emptying parameter can indicate the sluice foundation void area. Based on the research and analysis of shell element model, the feasibility of identification method of sluice foundation clearance area is verified. In order to more accord with the actual engineering, the finite element model of sluice with solid element is established, which is compared with the shell model. The structural dynamic characteristics of the solid model are more in line with the reality. Based on the structural modal analysis of ANSYS, the response surface equations between the natural frequency, the mode shape and the clearance parameters of the gate foundation are established, and the objective function is constructed by using the modal information. In order to improve the robustness of the identification algorithm, a new method based on displacement statistical moments is proposed to identify the sluice foundation void area. The finite element software ANSYS is used to analyze the time history of sluice model, to extract the response information, to calculate the statistical moment of displacement, and to establish the functional relationship between the characteristic parameters of statistical moment and the empty parameter. Then the objective function is constructed by using the measured value (numerical simulation) and the calculated value, and the parameters of sluice foundation clearance are inversed by solving the optimization problem. Numerical simulation results show that the identification method based on modal information can well indicate the gap area of sluice base, and with the increase of noise level, the recognition result will become worse. Compared with this method, the method based on statistical moments has better robustness, and the recognition result can still indicate the void area better when the noise level is large.
【學(xué)位授予單位】：南昌大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TV66;TV223

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