自升式平臺動態(tài)響應(yīng)特性及其控制研究
發(fā)布時間：2019-02-20 21:26
【摘要】：隨著人類開發(fā)海洋資源步伐的不斷加快,自升式平臺成為了海上油氣資源勘探、開采的重要技術(shù)裝備。然而,惡劣的海洋環(huán)境載荷會使自升式平臺產(chǎn)生過大的船體位移及速度,從而發(fā)生屈服及斷裂失效,且長期的船體振動使得平臺極易發(fā)生疲勞失效現(xiàn)象;因此,自升式平臺的動態(tài)響應(yīng)特性將關(guān)系到整個平臺的工作安全性能。本文首先研究了Super M2自升式平臺樁腿及升降鎖緊系統(tǒng)的力學(xué)性能,并基于Abaqus/Aqua模塊分析了自升式平臺的動態(tài)響應(yīng)特性及TMD裝置對平臺動態(tài)響應(yīng)的控制特性。其主要研究內(nèi)容及結(jié)論如下:1)基于彈塑性理論分析研究了各特征作用角度下樁腿的力學(xué)性能,即樁腿位移與側(cè)向力的變化關(guān)系曲線,基于彎曲變形積分求解法提出了一種樁腿等效建模方法,并通過模態(tài)分析對樁腿詳細(xì)模型、等效模型及廣義模型的固有頻率及振型進(jìn)行了對比分析,其中,樁腿廣義模型與詳細(xì)模型前兩階固有頻率的誤差率為84.65%,而樁腿等效模型的前兩階固有頻率誤差率僅為2.92%-15.86%。2)通過建立自升式平臺升降鎖緊系統(tǒng)的詳細(xì)數(shù)值模型,仿真分析了各特征作用角度下升降鎖緊系統(tǒng)的力學(xué)性能,獲得了上/下導(dǎo)向與樁腿及鎖緊系統(tǒng)橫向、垂向、扭轉(zhuǎn)、彎轉(zhuǎn)的連接剛度曲線;其中,上/下導(dǎo)向與樁腿及鎖緊系統(tǒng)的垂向和扭轉(zhuǎn)剛度值為常量,而鎖緊系統(tǒng)的橫向及彎轉(zhuǎn)剛度呈現(xiàn)各向異性和非線性特性。3)根據(jù)以上研究結(jié)果及相關(guān)規(guī)范要求建立了自升式平臺動態(tài)響應(yīng)分析模型,通過模態(tài)分析得到了作業(yè)工況及暴風(fēng)自存工況下自升式平臺的固有頻率及振型,其中,作業(yè)工況下自升式平臺的前三階固有頻率分別為0.0503494Hz、0.051409Hz和0.0597066Hz,而暴風(fēng)自存工況下的前三階固有頻率分別為0.0533153Hz、0.0544372Hz和0.0632236Hz,且均分別與兩種工況下的波浪頻率極為接近。4)運(yùn)用斯托克斯波理論研究了各特征角度海洋環(huán)境載荷作用下自升式平臺的動態(tài)響應(yīng)特性,基于Sadek提出的TMD裝置最優(yōu)參數(shù)計(jì)算方法,研究了TMD裝置對自升式平臺動態(tài)響應(yīng)的控制特性,并以此為基礎(chǔ),分別論述了TMD裝置與自升式平臺的質(zhì)量比、剛度比及阻尼比對平臺運(yùn)動參量的控制特性。研究結(jié)果表明,作業(yè)工況及暴風(fēng)自存工況下自升式平臺的最大位移及速度均出現(xiàn)于特征角度為90°時,且TMD裝置對自升式平臺的運(yùn)動參量具有顯著的控制效果,其中,90°暴風(fēng)載荷作用下,自升式平臺X、Y方向的位移及速度振幅分別減小了59.4%、68.16%、35.01%和48.72%。
[Abstract]:With the rapid development of marine resources, the jack-up platform has become an important technology and equipment for offshore oil and gas exploration and exploitation. However, the severe marine environment load will cause excessive ship displacement and velocity, which will lead to yield and fracture failure, and the long-term ship vibration will make the platform prone to fatigue failure. Therefore, the dynamic response of the jack-up platform will affect the safety performance of the whole platform. In this paper, the mechanical properties of Super M2 jack-up platform pile leg and lifting and locking system are studied, and the dynamic response characteristics of the platform and the control characteristics of the TMD device to the platform dynamic response are analyzed based on the Abaqus/Aqua module. The main research contents and conclusions are as follows: 1) based on the elastoplastic theory, the mechanical properties of the pile leg under various characteristic action angles are analyzed and studied, that is, the relationship curve between displacement and lateral force of the pile leg. Based on the integral method of bending deformation, an equivalent modeling method for pile leg is proposed. The natural frequencies and modes of the detailed model, equivalent model and generalized model of pile leg are compared and analyzed by modal analysis. The error rate of the first two natural frequencies of the generalized pile-leg model and the detailed model is 84.65. The error rate of the first two natural frequencies of the equivalent model of pile and leg is only 2.92-15.86.2) by establishing a detailed numerical model of the lifting and locking system of the self-elevating platform, The mechanical properties of the lifting and locking system under different characteristic action angles are simulated and analyzed. The connection stiffness curves of the upper / lower steering and pile-leg and the locking system are obtained, including transverse, vertical, torsional and flexural stiffness curves. Among them, the vertical and torsional stiffness of the upper / lower guidance and the pile leg and the locking system are constant, The lateral and bending stiffness of the locking system is anisotropic and nonlinear. 3) according to the above research results and related specifications, the dynamic response analysis model of the self-lifting platform is established. Through modal analysis, the natural frequencies and modes of the jack-up platform are obtained under the operating condition and the storm self-storage condition. The first three natural frequencies of the platform are 0.050 3494 Hz and 0.0597066 Hz, respectively, under the operating conditions, and the first three natural frequencies of the platform are 0.050 3494 Hz and 0.0597066 Hz, respectively, in which the first three natural frequencies are 0.050 3494 Hz and 0.0597066 Hz, respectively. The first three natural frequencies of the storm are 0.0533153Hz, 0.0544372Hz and 0.0632236Hz, respectively. And the wave frequencies are very close to those under two operating conditions. 4) the dynamic response characteristics of the jack-up platform under the action of marine environmental loads at different characteristic angles are studied by using Stokes wave theory. Based on the optimal parameter calculation method of TMD device proposed by Sadek, the control characteristics of TMD device to the dynamic response of jack-up platform are studied. On the basis of this, the mass ratio of TMD device and jack-up platform is discussed respectively. Stiffness ratio and damping ratio control characteristics of platform motion parameters. The results show that the maximum displacement and velocity of the platform appear when the characteristic angle is 90 擄, and the TMD device has a remarkable control effect on the motion parameters of the platform. Under the action of 90 擄storm load, the displacement and velocity amplitude in the direction of XY of the jack-up platform are reduced by 59.48.16% and 48.72%, respectively.
【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE951
本文編號：2427294
[Abstract]:With the rapid development of marine resources, the jack-up platform has become an important technology and equipment for offshore oil and gas exploration and exploitation. However, the severe marine environment load will cause excessive ship displacement and velocity, which will lead to yield and fracture failure, and the long-term ship vibration will make the platform prone to fatigue failure. Therefore, the dynamic response of the jack-up platform will affect the safety performance of the whole platform. In this paper, the mechanical properties of Super M2 jack-up platform pile leg and lifting and locking system are studied, and the dynamic response characteristics of the platform and the control characteristics of the TMD device to the platform dynamic response are analyzed based on the Abaqus/Aqua module. The main research contents and conclusions are as follows: 1) based on the elastoplastic theory, the mechanical properties of the pile leg under various characteristic action angles are analyzed and studied, that is, the relationship curve between displacement and lateral force of the pile leg. Based on the integral method of bending deformation, an equivalent modeling method for pile leg is proposed. The natural frequencies and modes of the detailed model, equivalent model and generalized model of pile leg are compared and analyzed by modal analysis. The error rate of the first two natural frequencies of the generalized pile-leg model and the detailed model is 84.65. The error rate of the first two natural frequencies of the equivalent model of pile and leg is only 2.92-15.86.2) by establishing a detailed numerical model of the lifting and locking system of the self-elevating platform, The mechanical properties of the lifting and locking system under different characteristic action angles are simulated and analyzed. The connection stiffness curves of the upper / lower steering and pile-leg and the locking system are obtained, including transverse, vertical, torsional and flexural stiffness curves. Among them, the vertical and torsional stiffness of the upper / lower guidance and the pile leg and the locking system are constant, The lateral and bending stiffness of the locking system is anisotropic and nonlinear. 3) according to the above research results and related specifications, the dynamic response analysis model of the self-lifting platform is established. Through modal analysis, the natural frequencies and modes of the jack-up platform are obtained under the operating condition and the storm self-storage condition. The first three natural frequencies of the platform are 0.050 3494 Hz and 0.0597066 Hz, respectively, under the operating conditions, and the first three natural frequencies of the platform are 0.050 3494 Hz and 0.0597066 Hz, respectively, in which the first three natural frequencies are 0.050 3494 Hz and 0.0597066 Hz, respectively. The first three natural frequencies of the storm are 0.0533153Hz, 0.0544372Hz and 0.0632236Hz, respectively. And the wave frequencies are very close to those under two operating conditions. 4) the dynamic response characteristics of the jack-up platform under the action of marine environmental loads at different characteristic angles are studied by using Stokes wave theory. Based on the optimal parameter calculation method of TMD device proposed by Sadek, the control characteristics of TMD device to the dynamic response of jack-up platform are studied. On the basis of this, the mass ratio of TMD device and jack-up platform is discussed respectively. Stiffness ratio and damping ratio control characteristics of platform motion parameters. The results show that the maximum displacement and velocity of the platform appear when the characteristic angle is 90 擄, and the TMD device has a remarkable control effect on the motion parameters of the platform. Under the action of 90 擄storm load, the displacement and velocity amplitude in the direction of XY of the jack-up platform are reduced by 59.48.16% and 48.72%, respectively.
【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE951
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