共查询到17条相似文献，搜索用时 140 毫秒
1.
对不规则波对浪溅区结构物的冲击作用实验结果进行了谱分析研究。给出了不同试验组次的结构物底面所受波浪冲击压力的谱分析结果，得到了结构物底面所受波浪冲击压力的谱矩m0沿结构物底面的分布规律，讨论了入射波波要素和结构物底面距静水面的相对高度s/H1/3对作用于结构物底面的冲击压力谱矩m0,avg的影响，给出了平均冲击压力谱矩m0,svg.与统计分析的压力特征值Pc的关系。 相似文献
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波浪对透空式海上建筑物的冲击作用已经成为此类建筑物安全的重要影响因素。进行了单向随机波对水平板冲击作用水槽实验研究。总共进行了4个方向(0°、15°3、0°、45°),相对入射波波高H1/3/d=0.093 75~0.25,周期Tp=1.0~2.0 s,水平板距离静水面的高度s与入射波高H1/3的比值s/H1/3=0.0~0.5的实验研究。采用小波分析方法去除了由于测压传感器振荡引起的测量数据的振荡和漂移,在此基础上统计分析给出了不同方向水平板下的压力峰值分布情况。采用无因次方法,讨论了无因次冲击力与相对入射波高H1/3/d、相对板宽B/L、相对净空s/H1/3及波向角β的关系。 相似文献
3.
新型开孔工字板组合式防波堤波浪力特性试验研究 总被引：1，自引：1，他引：0
开孔工字板组合式防波堤是基于透空板式防波堤的一种新型结构形式,具有自重轻、材料省的特点。为充分了解新型开孔组合式防波堤的受力特性,基于室内水槽物理模型试验,测量新型开孔工字板组合式防波堤上的波压力与结构总力,研究相对波高H/d、相对波长L/B对该新型防波堤结构表面压力的影响,讨论了该新型防波堤所受波浪力荷载与相对波高H/d、相对波长L/B的关系。结果表明,相对波高H/d是决定新型防波堤结构表面波压力和结构总力的主要影响因素。该新型防波堤结构波浪力荷载以垂直方向受力为主,新型防波堤结构所受竖向总力远大于水平总力,最大可达到15倍。新型防波堤水平总力随相对波长L/B先增大后趋于稳定。相对波长L/B=3.617是防波堤结构水平总力变化幅度的分界点。 相似文献
4.
通过模型试验的方式研究了波浪对二维水平板冲击压力峰值的概率分布。首先,统计分析了水平板底部各测点的压力峰值,发现密闭水平板底部各位置处的压力峰值分布与三参数威布尔分布吻合较好;然后,从统计学与概率论的角度进一步探讨了水平板底部各位置处压力峰值分布函数的参数与测量样本统计特征值之间的关系;最后,通过不同入射波浪工况的对比,分析了威布尔分布各参数与测点相对位置、入射波相对波高以及入射波相对波长之间的关系及其所代表的物理意义。统计分析显示:威布尔分布的相对位置参数(θ/-P)从水平板前端到后端呈现先增大后减小的趋势,在水平板中段较恒定(约为0.6);相对尺度参数(λ/-P),在水平板中段偏小,两端偏大;形状参数(κ)在相对波高较大时,在水平板的中段偏大,并且相对波长大于1.3时,κ在水平板的中部均值随相对波长的增大而减小,相对波长为2时,该值接近于1。 相似文献
5.
透空格栅板式防波堤是一种新型防波堤结构,为了促进该结构在实际工程中的应用,论文通过模型试验研究其所受波浪点压力和波浪总力的特征。试验结果表明,在规则波作用下,下层水平格栅板所受波浪点压力较上层水平格栅板大,且防波堤中前端波浪点压力分布不规律;相对板宽B/L对该防波堤所受波浪总力的影响较大,相对板间距S/h对其整体稳定性的影响次之,而相对波高H/h主要影响该防波堤的垂向受力;此外,当上层水平格栅板与静水面齐平且孔隙率相对较大时,该防波堤所受波浪总力最小,对其整体稳定性最有利。 相似文献
6.
为探求斜坡堤典型胸墙迎浪面所受波浪力大小的影响因素,设计前仰式、深弧式、后仰式和直立式四种结构型式胸墙进行相关的物理模型试验。通过在典型胸墙迎浪面间隔布置压力测点获取所受波浪压力,并将其进行积分求和得到胸墙所受波浪力,进而讨论相对波高(H/d)、相对波长(L/d)、斜坡坡度和胸墙结构型式对波浪力的影响。试验结果表明：相对波高与相对波长对胸墙所受波浪力影响显著。波浪力随着相对波高的增大而增大,随着相对波长的增大呈现先增大—后减小—再增大的变化趋势。波浪力随着斜坡坡度的增大而减小。斜坡堤弧形胸墙所受波浪力明显大于直立式胸墙所受波浪力;在斜坡堤弧形胸墙中,前仰式胸墙受力较其余两种型式胸墙受力小。研究结果将加深波浪对斜坡堤胸墙作用力的理解,为后续工程设计提供理论指导。 相似文献
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鉴于双弧板式透空堤的消浪性能仍不理想,提出了一种潜堤—双弧板组合结构,并基于OpenFOAM软件建立了波浪与该结构相互作用的数值模型,采用试验结果对所建数值模型进行验证。在此基础上,讨论了该新型结构的消浪特性、波压力分布特征以及所受波浪力的影响因素。结果表明,透射系数随相对板宽的增大而减小,反射系数则相反。透射与反射系数随相对潜深的变化较为显著。当结构位于静水位上方（即相对潜深为-0.05）时,透射系数最小而反射系数最大;当结构位于静水位下方（即相对潜深为0.05）时,透射系数最大而反射系数最小。该组合结构两块弧板上下表面的正负压力变化关于横轴近似对称,不同测点处的压力值差异显著。水平波浪力与垂直波浪力的变化趋势大致相似,但垂直波浪力远大于水平波浪力。研究结果可为其工程应用提供理论指导与技术支撑。 相似文献
9.
波浪破碎是海洋中最常见的现象之一,其能够对海洋中的结构物产生巨大的波浪力作用。本文在大比尺波浪水槽通过聚焦波的方法生成了极端波浪和不同破碎阶段的破碎波浪,并对其冲击桩柱过程中的点压力进行了测量,进而采用连续小波变换的方法,对桩柱上点压力的分布及大小进行了细致分析。结果表明,多次重复试验下,相比非破碎极端波浪,破碎极端波浪产生的点压力离散性更强;波浪破碎程度越大,测点位置越靠近波峰,则点压力离散程度越大;破碎波的最大点压力出现在1.2倍的最大波面附近,且其大小可达3倍的最大静水压力;基于点压力小波谱,不同破碎阶段破碎波产生冲击作用不同,对于波浪作用桩柱前波浪已经发生破碎的情况,其冲击区域更大,点压力分布更复杂;而对于桩面破碎的情况,其造成的波浪总力更大。 相似文献
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带有弹簧支撑的水平板结构,可在波浪作用下起伏运动进行消浪,作为防波堤具有广泛的应用前景,但如何设计支撑刚度仍是当前研究的重点课题。基于黏性流理论建立数值波浪水槽,开展规则波与起伏板防波堤相互作用的模拟,得到起伏板透反射系数随支撑刚度的变化曲线,并分析最小透射系数对应刚度下起伏板运动相位对消浪的影响。为快速得到最小透射系数对应的支撑刚度,根据弹簧—阻尼—质量模型,建立一种以运动相位为输入反推起伏板最优支撑刚度的计算方法,并将推导结果与数值结果进行比较。结果表明,该方法推导的最优支撑刚度值与数值最优值接近,且可省去遍历取最优值的步骤,可为起伏板防波堤的支撑刚度设计提供参考。 相似文献
11.
The superstructures of marine structures supported by the elastic legs and located in the splash zone will subject to violent wave slamming and vibrate consequently during storms. A series of model tests are carried out to investigate the wave impacting on the open structures supported elastically. Three kinds of models with different natural frequencies are designed. The characteristics of the wave pressures on the three models are compared. The durations of the uplift forces and the corresponding accelerations of the structure during wave impact are analyzed simultaneously. The distributions of the peak impact pressures on the subfaces of the plates with different supporting stiffness are given. The relationship between the uplift force on the three models and the relative clearance are obtained. The spectral properties of the slamming loads on the three different structures are compared. The experimental results indicate that the behaviors of the impact pressures, the uplift forces and accelerations of the plates with small natural frequencies are obviously different from those of the plates with larger natural frequencies within the range of the experimental parameters. 相似文献
12.
The experimental investigation of unidirectional random wave slamming on the three-dimensional structure in the splash zone is presented. The experiment is conducted in the marine environment channel in the State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology. The test wave is unidirectional irregular wave. The experiments are carried out with perpendicular random waves (β=0°) and oblique random waves (β=15°, 30°, 45°), the significant wave heights H1/3 ranging from 7.5 to 20 cm with 2.5 cm increment, the peak wave periods Tp ranging from 0.75 to 2.0 s with 0.25 s increment, and the clearance of the model with respect to the significant wave height s/H1/3 ranging from 0.0 to 0.5 with 0.1 increment. The statistical analysis results of different test cases are presented. The statistical distribution characteristics of the perpendicular irregular wave impact pressures are compared with that of the oblique irregular wave on the underside of the structure. The effect of the wave direction β on the wave impact forces on the underside of the structure is determined. The relation between the impact forces and the parameters such as the significant wave height, the relative structure width and the relative clearance of the structure is also discussed. 相似文献
13.
The numerical investigation of random wave slamming on superstructures of marine structures in the splash zone is presented in this paper. The impact pressures on the underside of the structure are computed based on the improved volume of fluid method (VOF). The governing equations are Reynolds time-averaged equations and the two equation k– model. The third order upwind difference scheme is applied to the convection term to reduce the effect of numerical viscosity. The numerical wave flume with random wave-maker suitable for VOF is established. Appropriate moving contact-line boundary conditions are introduced to the model wave in contact with and separated from the underside of structure. Parametric studies have been carried out for different incident waves, structure dimensions and structure clearance. The numerical results are verified by the experimental results. 相似文献
14.
Laboratory study of random wave slamming on a piled wharf with different shore connecting structures
《Coastal Engineering》2005,52(5):463-471
Impact pressures from random waves on the underside of a wharf deck were measured in a laboratory wave channel. Three different types of shore connecting structures were considered: open-piled, permeable slope and impermeable slope wharves. The experiments were carried out with significant wave heights ranging from 10 cm to 20 cm, spectral peak periods ranging from 1.0 s to 2.0 s, and the relative clearance of the model with respect to significant wave heights ranging from 0.1 to 0.4. The characteristics of the wave impact pressures for different shore connecting conditions are investigated, and their statistical distributions along the underside of the models are also determined. Experimental results indicate that the impact pressures depend on parameters such as the significant wave height, the spectral peak period, and the relative length and clearance of the model. 相似文献
15.
Aimed at the hydrodynamic response for marine structures slamming into water, based on the mechanism analysis to the slamming process, and by combining 3D N?S equation and turbulent kinetic equation with structure fully 6DOF motion equation, a mathematical model for the wind-fluid-solid interaction is established in 3D marine structure slamming wave at free poses and wind-wave-flow complex environments. Compared with the results of physical model test, the numerical results from the slamming wave well correspond with the experimental results. Through the mathematical model, the wave-making issue of 3D marine structure at initial pose falls into water in different complex wind, wave and flow environments is investigated. The research results show that various kinds of natural factors and structure initial poses have different influence on the slamming wave, and there is an obvious rule in this process. 相似文献
16.
Experimental Investigation of Instantaneous Properties of Wave Slamming on the Plate 总被引：1，自引：0，他引：1
The purpose of this paper is to investigate the instantaneous properties of wave slamming on the plate structure of an open structure.The advanced instantaneous measuring technique-Particle Image Velocimetry(PIV) is applied to acquire the instantaneous velocity field of wave slamming.From the cross-correlation analysis results of the images captured by the CCD camera,the flow fields of wave impacting on the structure are displayed visually,and the instantaneous whole-field fluid velocity vectors are obtained.The relation between the instantaneous peak impacting pressures and the instantaneous velocities of water particles is studied by probability analysis. 相似文献
17.
The wave transmission characteristics and wave induced pressures on twin plate breakwater are investigated experimentally in regular and random waves.A total of twenty pressure transducers are fixed on four surfaces of twin plate to measure the wave induced dynamic pressures.The spatial distribution of dynamic wave pressure is given along the surface of the twin plate.The uplift wave force obtained by integrating the hydrodynamic pressure along the structure is presented.Discussed are the influence of different incident wave parameters including the relative plate width B /L,relative wave height /i H a and relative submergence depth s /a on the non-dimensional dynamic wave pressures and total wave forces.From the investigation,it is found that the optimum transmission coefficient,t K occurs around B /L 0.41 ~ 0.43,and the twin plate breakwater is more effective in different water depths.The maximum of pressure ratio decreases from 1.8 to 1.1 when the relative submergence depth of top plate is increased from 0.8to +0.8. 相似文献