300噸級漁政船全船振動特性預(yù)報
發(fā)布時間：2018-11-18 13:56
【摘要】：船舶在正常的營運過程中,會受到螺旋槳、船舶主機等激勵的作用。這些激勵將引發(fā)船舶發(fā)生不同程度的振動甚至是有害振動,由此可能導(dǎo)致船舶結(jié)構(gòu)產(chǎn)生疲勞破壞,影響到船舶設(shè)備正常使用,以及工作人員的效率甚至身體健康。因此,在船舶設(shè)計的不同階段必須預(yù)報船舶的振動特性,提出存在的問題以及解決措施,避免發(fā)生共振,使船舶結(jié)構(gòu)達到低振動、低噪聲的要求。本文以300噸級漁政船為研究對象,通過有限元軟件ANSYS對其振動特性進行研究。主要內(nèi)容如下： (1)計算并分析目標(biāo)船的主要激勵源,包括主機激勵和螺旋槳激勵。V型柴油機可以看成兩個直列式柴油機進行不平衡力和力矩的計算,然后按照氣缸夾角進行合成即可。 (2)全船總振動特性計算分析。首先在Pro/Engineer中建立目標(biāo)船的三維幾何模型,然后用專業(yè)網(wǎng)格劃分軟件HyperMesh進行網(wǎng)格劃分得到有限元離散模型,相關(guān)屬性和附連水質(zhì)量施加完成后導(dǎo)入ANSYS進行模態(tài)分析,得到總振動的前6階固有頻率和振型。然后與主要激勵頻率進行對比,對比結(jié)果表明該船滿足頻率儲備要求,不會發(fā)生整船共振現(xiàn)象。 (3)目標(biāo)船強迫振動響應(yīng)計算分析。確定船體阻尼、位移邊界條件以及載荷的施加方式后進行瞬態(tài)動力學(xué)分析,得到速度和加速度的時域特性,結(jié)合評價基準(zhǔn)的特點進行傅立葉變換得到參數(shù)的頻域特性。無論是單機工作還是雙機工作,各評價區(qū)域的速度峰值均小于下限4mm/s,處于振動輕微區(qū)域,該船振動特性良好。單機工作下和雙機工作下的振動最大區(qū)域都在機艙處所,速度峰值分別為0.7mm/s和1.7mm/s.表明機艙是全船振動較為惡劣的地方,應(yīng)給予充分的關(guān)注。
[Abstract]:In the normal operation process, ship will be driven by propeller, ship main engine and so on. These incentives will lead to different degrees of vibration and even harmful vibration of the ship, which may lead to fatigue damage of the ship structure, which will affect the normal use of ship equipment, as well as the efficiency of the staff and even the health of the staff. Therefore, in different stages of ship design, the vibration characteristics of the ship must be predicted, and the existing problems and solutions should be put forward to avoid resonance and to make the ship structure meet the requirements of low vibration and low noise. In this paper, the vibration characteristics of 300 dwt fishery administration ship are studied by finite element software ANSYS. The main contents are as follows: (1) the main excitation sources of the target ship are calculated and analyzed, including main engine excitation and propeller excitation. V diesel engine can be regarded as two linear diesel engines to calculate the unbalanced force and torque. Then according to the cylinder angle synthesis can be. (2) calculation and analysis of the total vibration characteristics of the whole ship. Firstly, the 3D geometric model of the target ship is established in Pro/Engineer, and then the finite element discrete model is obtained by using the specialized meshing software HyperMesh. After the relevant attributes and the attached water quality are applied, the modal analysis is carried out by ANSYS. The first six natural frequencies and modes of total vibration are obtained. Then compared with the main excitation frequency, the comparison results show that the ship meets the requirement of frequency reserve and does not have the whole ship resonance phenomenon. (3) calculation and analysis of forced vibration response of target ship. After determining the hull damping, displacement boundary conditions and load application mode, the transient dynamics analysis is carried out, and the time-domain characteristics of velocity and acceleration are obtained, and the frequency-domain characteristics of parameters are obtained by Fourier transform combined with the characteristics of evaluation datum. The peak velocity of each evaluation area is less than the lower limit of 4 mm / s, and the ship is in a slight vibration region, and the vibration characteristics of the ship are good. The maximum vibration area under single and dual operation is in the cabin, and the peak velocities are 0.7mm/s and 1.7 mm / s, respectively. It shows that the engine room is the place where the vibration of the whole ship is relatively bad, which should be given sufficient attention.
【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U661.44;U674.2
本文編號：2340221
[Abstract]:In the normal operation process, ship will be driven by propeller, ship main engine and so on. These incentives will lead to different degrees of vibration and even harmful vibration of the ship, which may lead to fatigue damage of the ship structure, which will affect the normal use of ship equipment, as well as the efficiency of the staff and even the health of the staff. Therefore, in different stages of ship design, the vibration characteristics of the ship must be predicted, and the existing problems and solutions should be put forward to avoid resonance and to make the ship structure meet the requirements of low vibration and low noise. In this paper, the vibration characteristics of 300 dwt fishery administration ship are studied by finite element software ANSYS. The main contents are as follows: (1) the main excitation sources of the target ship are calculated and analyzed, including main engine excitation and propeller excitation. V diesel engine can be regarded as two linear diesel engines to calculate the unbalanced force and torque. Then according to the cylinder angle synthesis can be. (2) calculation and analysis of the total vibration characteristics of the whole ship. Firstly, the 3D geometric model of the target ship is established in Pro/Engineer, and then the finite element discrete model is obtained by using the specialized meshing software HyperMesh. After the relevant attributes and the attached water quality are applied, the modal analysis is carried out by ANSYS. The first six natural frequencies and modes of total vibration are obtained. Then compared with the main excitation frequency, the comparison results show that the ship meets the requirement of frequency reserve and does not have the whole ship resonance phenomenon. (3) calculation and analysis of forced vibration response of target ship. After determining the hull damping, displacement boundary conditions and load application mode, the transient dynamics analysis is carried out, and the time-domain characteristics of velocity and acceleration are obtained, and the frequency-domain characteristics of parameters are obtained by Fourier transform combined with the characteristics of evaluation datum. The peak velocity of each evaluation area is less than the lower limit of 4 mm / s, and the ship is in a slight vibration region, and the vibration characteristics of the ship are good. The maximum vibration area under single and dual operation is in the cabin, and the peak velocities are 0.7mm/s and 1.7 mm / s, respectively. It shows that the engine room is the place where the vibration of the whole ship is relatively bad, which should be given sufficient attention.
【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U661.44;U674.2
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