CN108709541A - A kind of ocean platform sea ice monitoring devices and methods therefor - Google Patents
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Abstract
Description
技术领域technical field
本发明涉及海洋石油平台开采冬季海冰监测管理,通过平台冰振响应传感器及冰情监测所使用的水温剖面监测仪、视频监测器及风速仪组建海洋石油平台海冰监测系统实现对海冰冰振及冰情时实监测。The invention relates to the monitoring and management of sea ice in the mining of offshore oil platforms in winter. The sea ice monitoring system of the offshore oil platform is established through the platform ice vibration response sensor and the water temperature profile monitor, video monitor and anemometer used for ice condition monitoring to realize the detection of sea ice and ice vibration. And real-time monitoring of ice conditions.
背景技术Background technique
随着技术的进步以及对能源的不断需求,海洋资源油气开发已经延伸到了结冰海域。常规海域的海洋油气开发、结构设计只需考虑常规海洋环境荷载(风、浪、流),但在结冰海域,无论是海洋工程结构物的设计还是资源的钻探、开发,都不得不面临着海冰带来的问题。With the advancement of technology and the continuous demand for energy, the development of oil and gas in marine resources has been extended to icy sea areas. Offshore oil and gas development and structural design in conventional sea areas only need to consider conventional marine environmental loads (wind, waves, currents), but in icy sea areas, both the design of offshore engineering structures and the drilling and development of resources have to face Problems posed by sea ice.
在多数结冰海域,海冰对海洋资源开发的威胁,要远比波浪和风的影响大得多。历史上曾发生多起海冰引起的事故,如:1963年美国库克湾的两座简易平台被冰推倒;1969年渤海冰封期间我国“老二号”平台在海冰的巨大推力下倒塌;70年代波斯尼亚湾的灯塔在冰振的作用下倒塌;80年代波弗特海的Molikpaq沉箱在冰激振动下地基发生砂土液化。在我国,八十年代后期在渤海辽东湾海域建造的多座平台也发现了明显的冰激振动,使得渤海油气冬季开发存在很大的安全隐患。2000年冬季,由于冰激振动造成渤海某平台的8号井排空管线疲劳断裂和法兰松动,导致平台关井停产;持续的冰激振动对该平台的作业人员也产生了影响,降低了舒适度和工作效率,严重时会危害其身心健康。In most icy sea areas, sea ice poses a far greater threat to marine resource development than waves and wind. There have been many accidents caused by sea ice in history, such as: In 1963, two simple platforms in the Cook Inlet of the United States were overthrown by ice; in 1969, when the Bohai Sea was frozen, my country's "Old No. 2" platform collapsed under the huge thrust of sea ice In the 1970s, the lighthouse in the Gulf of Bosnia collapsed under the action of ice vibration; in the 1980s, the foundation of the Molikpaq caisson in the Beaufort Sea liquefied under the ice-induced vibration. In my country, obvious ice-induced vibrations were also found in many platforms built in the Liaodong Bay of the Bohai Sea in the late 1980s, which caused great safety hazards in the oil and gas development in the Bohai Sea in winter. In the winter of 2000, due to ice-induced vibration, the exhaust pipeline of No. 8 well of a platform in Bohai Sea was fatigued and fractured and the flange was loose, which led to the shutdown of the platform; the continuous ice-induced vibration also had an impact on the operators of the platform, reducing the Comfort and work efficiency, when serious, it will endanger their physical and mental health.
目前,国际上的海冰管理是综合多种手段、技术的一个体系,主要通过海冰侦测预报、海冰威胁预警、破冰除冰手段、作业设施的紧急停止、回避等一系列方法对海洋油气开发过程中海冰所造成的威胁进行分析、评价并保证生产安全。At present, international sea ice management is a system that integrates various means and technologies. Analyze and evaluate the threats posed by sea ice during oil and gas development and ensure production safety.
从上世纪30年代开始,俄罗斯以及就巴伦支海域的冰山情况采用飞行器观测、破冰船记录的方式进行了近70年的观测,通过长期的观测记录,了解该海域冰山的移动方向、冰山尺寸以及整个海域的冰山分布情况。1983-1993在波弗特海的石油钻探过程中,为避免受到海冰的影响,建立了整套海冰管理系统。海冰监测管理是保障现役油气平台冬季安全作业的重要手段。海冰管理系统的实施在使得钻探设施整个施工作业过程中得到有效的保护,降低了海冰对整个工程的威胁。Since the 1930s, Russia and the Barents Sea have used aircraft observations and icebreaker records to observe icebergs in the Barents Sea for nearly 70 years. Through long-term observation records, we can understand the direction of movement of icebergs in this sea area, the size of icebergs and Distribution of icebergs throughout the ocean. During oil drilling in the Beaufort Sea from 1983 to 1993, in order to avoid being affected by sea ice, a complete sea ice management system was established. Sea ice monitoring and management is an important means to ensure the safe operation of active oil and gas platforms in winter. The implementation of the sea ice management system has effectively protected the drilling facilities during the entire construction process and reduced the threat of sea ice to the entire project.
目前已有的海冰灾害预报技术主要是针对海冰要素的观测预报,不能满足油气平台海冰风险预警的准确性和时效性要求。国际寒区工程开发领域,此前尚没有面向冰区石油开发的监测与安全管理系统。因此面向海洋石油平台的海冰监测对保障平台的冬季安全运行是十分必要的。The existing sea ice disaster prediction technology is mainly aimed at the observation and forecast of sea ice elements, which cannot meet the accuracy and timeliness requirements of sea ice risk early warning for oil and gas platforms. In the field of international cold region engineering development, there is no monitoring and safety management system for oil development in ice regions. Therefore, sea ice monitoring for offshore oil platforms is very necessary to ensure the safe operation of platforms in winter.
发明内容Contents of the invention
本发明的目的:实现海洋石油平台海冰监测管理,采集海洋石油平台冰振数据、海水温度剖面数据,海冰厚度及速度数据、平台区域风速数据。可为海冰冰清预报、海冰威胁预警及平台冰振失效标准制定提供依据,同时满足油气平台海冰风险预警的准确性和时效性要求。The purpose of the present invention is to realize sea ice monitoring and management of offshore oil platforms, collect ice vibration data of offshore oil platforms, seawater temperature profile data, sea ice thickness and speed data, and platform area wind speed data. It can provide a basis for sea ice clear forecast, sea ice threat early warning and platform ice vibration failure standard formulation, and at the same time meet the accuracy and timeliness requirements of oil and gas platform sea ice risk early warning.
本发明提供了一种海洋平台海冰监测装置,包括:设置有主控板的主控机、解码开发板及上位机组成的主控系统,其中,解码开发板的输出端与主控板连接,主控板输出端与上位机连接;视频监测器设置在石油平台利于海冰监测位置,其输出端与主控板连接,将海冰厚度、海冰速度数据传送到主控板;冰振响应传感器设置在石油平台工作台位置,其输出端与解码开发板连接,将海上石油平台冰激振动数据传送到解码开发板;解码开发板将解码后的数据发送给主控板;主控板将输入的监测数据进行处理,并传输到上位机;主控板通过公式:α=a/(hi 2*vi)确定出具体平台的待定系数α;其中,a为平台结构的振动加速度;上位机对监测数据进存储及远程传输;视频监测器、冰振响应传感器、主控板、解码开发板及上位机均由电源供电。The invention provides a sea ice monitoring device on an ocean platform, comprising: a main control system composed of a main control machine provided with a main control board, a decoding development board and a host computer, wherein the output end of the decoding development board is connected to the main control board , the output end of the main control board is connected to the upper computer; the video monitor is set on the oil platform to facilitate sea ice monitoring, and its output end is connected to the main control board to transmit the data of sea ice thickness and sea ice speed to the main control board; The response sensor is set at the position of the oil platform workbench, and its output terminal is connected to the decoding development board to transmit the ice-induced vibration data of the offshore oil platform to the decoding development board; the decoding development board sends the decoded data to the main control board; the main control board Process the input monitoring data and transmit it to the host computer; the main control board determines the undetermined coefficient α of the specific platform through the formula: α=a/(h i 2 *v i ); where a is the vibration acceleration of the platform structure ;The host computer stores and remotely transmits the monitoring data; the video monitor, ice vibration response sensor, main control board, decoding development board and the host computer are all powered by the power supply.
优选的,所述视频监测器通过公式:hi=H_Diameter*T/Dh得到海冰厚度;其中,H_Diameter为标定物为锥体的防浪孔的孔径,T为图像上的冰断面像素大小,Dh为标定物为锥体的防浪孔,孔径H_Diameter为20cm,其在图像上的像素大小。Preferably, the video monitor obtains the thickness of sea ice by the formula: h i =H_Diameter*T/Dh; wherein, H_Diameter is the aperture of the wave hole whose calibration object is a cone, and T is the pixel size of the ice section on the image, Dh is the anti-wave hole whose calibration object is a cone, the aperture H_Diameter is 20cm, and its pixel size on the image.
优选的,所述视频监测器通过公式:vi=Hs/(ht)得到海冰速度;其中,H为摄像机的透镜与真实物体距离为,s为图像上的像素长度,h为摄像机的透镜与真实物体所成像的距离,t为运行时间。Preferably, the video monitor obtains the sea ice speed through the formula: v i =Hs/(ht); wherein, H is the distance between the lens of the camera and the real object, s is the pixel length on the image, and h is the lens of the camera The imaged distance from the real object, t is the running time.
优选的,所述视频监测器将冰向角度数据传送到主控板;所述视频监测器通过公式:获得冰向角度;其中,(x0,y0)为初始帧特征点的坐标,(x1,y1)为最终帧的特征点坐标。Preferably, the video monitor transmits the ice angle data to the main control board; the video monitor passes the formula: Obtain the ice orientation angle; where (x 0 , y 0 ) is the coordinates of the feature points in the initial frame, and (x 1 , y 1 ) is the coordinates of the feature points in the final frame.
优选的,所述监测装置包括:设置在石油平台顶部的风速仪,其输出端与主控板连接,并将平台区域风速数据传送到主控板。Preferably, the monitoring device includes: an anemometer arranged on the top of the oil platform, the output end of which is connected to the main control board, and transmits the wind speed data in the platform area to the main control board.
优选的,所述监测装置包括:设置在石油平台桩腿延伸至海平面以下的水温剖面监测传感器,其输出端与主控板连接,将海平面以下设定深度温度剖面数据传送到主控板;所述水温剖面监测传感器的时钟为:6:00-18:00;采样间隔为:1.5m;采样脉冲长短:10s。Preferably, the monitoring device includes: a water temperature profile monitoring sensor installed on the legs of the oil platform extending below the sea level, the output end of which is connected to the main control board, and transmits the temperature profile data at a set depth below the sea level to the main control board ; The clock of the water temperature profile monitoring sensor is: 6:00-18:00; the sampling interval is: 1.5m; the sampling pulse length: 10s.
优选的,所述冰振响应传感器的精度为:10mv/dal。Preferably, the precision of the ice vibration response sensor is: 10mv/dal.
优选的,所述视频监测器的自动采集时间为:6:00-18:00;焦距为:12mm。Preferably, the automatic acquisition time of the video monitor is: 6:00-18:00; the focal length is: 12mm.
本发明另提供一种海洋平台海冰监测方法,包括以下步骤:步骤A.视频监测器通过公式:hi=H_Diameter*T/Dh得到海冰厚度;其中,H_Diameter为标定物为锥体的防浪孔的孔径,T为图像上的冰断面像素大小,Dh为标定物为锥体的防浪孔,孔径H_Diameter为20cm,其在图像上的像素大小;步骤B.视频监测器通过公式:vi=Hs/(ht)得到海冰速度;其中,H为摄像机的透镜与真实物体距离为,s为图像上的像素长度,h为摄像机的透镜与真实物体所成像的距离,t为运行时间;步骤C.主控板通过公式:α=a/(hi 2*vi)确定出具体平台的待定系数α;其中,a为平台结构的振动加速度。The present invention also provides a sea ice monitoring method on an ocean platform, comprising the following steps: Step A. The video monitor obtains the sea ice thickness through the formula: h i =H_Diameter*T/Dh; The aperture of the wave hole, T is the pixel size of the ice section on the image, Dh is the wave hole whose calibration object is a cone, the aperture H_Diameter is 20cm, and its pixel size on the image; Step B. The video monitor passes the formula: v i = Hs/(ht) to get the sea ice velocity; where, H is the distance between the camera lens and the real object, s is the pixel length on the image, h is the imaging distance between the camera lens and the real object, and t is the running time ; Step C. The main control board determines the undetermined coefficient α of the specific platform through the formula: α=a/(h i 2 *v i ); wherein, a is the vibration acceleration of the platform structure.
优选的,所述视频监测器通过公式:获得冰向角度;其中,(x0,y0)为初始帧特征点的坐标,(x1,y1)为最终帧的特征点坐标。Preferably, the video monitor adopts the formula: Obtain the ice orientation angle; where (x 0 , y 0 ) is the coordinates of the feature points in the initial frame, and (x 1 , y 1 ) is the coordinates of the feature points in the final frame.
本发明具有以下效果:The present invention has the following effects:
1)根据本发明装置能够实现海上石油平台冰激振动数据、海平面以下设定深度温度剖面数据、海冰厚度和海冰速度数据、平台区域风速数据集中采集处理,并能实现所监测数据存储及远程传输。1) According to the device of the present invention, the ice-induced vibration data of the offshore oil platform, the temperature profile data of the set depth below sea level, the sea ice thickness and sea ice speed data, and the wind speed data in the platform area can be collected and processed in a centralized manner, and the monitored data can be stored and remote transmission.
2)本发明可为海油石油平台海冰冰清预报、海冰威胁预警及平台冰振失效标准制定提供依据,满足海洋油气平台海冰风险预警的准确性和时效性要求。2) The present invention can provide a basis for sea ice and ice clearance forecast, sea ice threat early warning and platform ice vibration failure standard formulation for CNOOC oil platform, and meet the accuracy and timeliness requirements of offshore oil and gas platform sea ice risk early warning.
附图说明Description of drawings
图1本发明实施例的现场安装图。Fig. 1 is the on-site installation diagram of the embodiment of the present invention.
图2本发明实施例的图像测量的原理。Fig. 2 is the principle of image measurement in the embodiment of the present invention.
图3本发明实施例的平台定点观测中的冰厚测量示意图。Fig. 3 is a schematic diagram of ice thickness measurement in platform fixed-point observation according to an embodiment of the present invention.
图4本发明实施例的目标物的位置变化。Fig. 4 shows the change of the position of the target in the embodiment of the present invention.
图5本发明实施例的1平台最大加速度与冰速、冰厚关系现场统计。Fig. 5 Field statistics of the relationship between the maximum acceleration of the platform 1 and the ice speed and ice thickness in the embodiment of the present invention.
具体实施方式Detailed ways
下面已有选对实施例对本发明的技术方案进行进一步说明。The technical solution of the present invention will be further described in the following selected pairs of embodiments.
1.发明原理1. Invention principle
在冰厚、冰速、冰向的测量上,图像法测量原理如图2所示。真实长度为L的物体通过焦距为f的摄像机投影到图像上的像素长度为l。摄像机的透镜与真实物体距离为H,和所成像的距离为h。当H不变的时候,L与l的比值是不变的,即In the measurement of ice thickness, ice speed and ice direction, the principle of image method measurement is shown in Figure 2. The pixel length of an object with real length L projected onto the image by a camera with focal length f is l. The distance between the lens of the camera and the real object is H, and the distance of the image is h. When H is constant, the ratio of L to l is constant, that is
所以在现场图像测量应用中,首先保持摄像机的焦距不变,用已知长度L的物体对摄像头进行标定,得到比例n,则被测物体长度S,与其图像上的像素长度s的关系为:Therefore, in the application of on-site image measurement, firstly keep the focal length of the camera unchanged, calibrate the camera with an object of known length L, and obtain the ratio n, then the relationship between the length S of the measured object and the pixel length s on the image is:
进而得到被测物体的真是长度S的表达式如下。Then the expression of the true length S of the measured object is obtained as follows.
S=n×s (1-3)S=n×s (1-3)
所以测量中,物体与镜头之间的距离H要是不变的。但是在实际测量中,实测物体与镜头之间的距离H无法保证和标定时的距离完全一致。当θ角度很小且H的差异较小的时候,其对测量结果的影响较小,基本可以忽略。图像测量的原理如图2。Therefore, in the measurement, the distance H between the object and the lens is constant. However, in actual measurement, the distance H between the measured object and the lens cannot be guaranteed to be exactly the same as the distance during calibration. When the θ angle is very small and the difference of H is small, its influence on the measurement results is small and can basically be ignored. The principle of image measurement is shown in Figure 2.
1.1冰厚测量1.1 Ice thickness measurement
冰厚是影响冰荷载的形式和大小的重要因素之一。图像测量法相对来说方法简单,而近几年图像测量技术的发展也很迅速,如果采用高精度的摄像头,可以精确对结构的微小变形进行测量,因此比较适合现场冰厚的测量。Ice thickness is one of the important factors affecting the form and magnitude of ice loads. The image measurement method is relatively simple, and the image measurement technology has developed rapidly in recent years. If a high-precision camera is used, the small deformation of the structure can be accurately measured, so it is more suitable for on-site ice thickness measurement.
图像法测量冰厚的基本思路是,冰与结构作用发生破碎后,破碎的冰块会翻转然后掉落到水中,翻转时候露出的断面可以被摄像机捕获到。利用已知尺寸的物体对摄像头进行标定,摄像机的焦距一定,则可以根据标定物的尺寸以及冰断面的像素点的大小来计算冰厚的大小。The basic idea of the image method to measure the ice thickness is that after the ice and the structure are broken, the broken ice will turn over and fall into the water, and the section exposed during the turnover can be captured by the camera. The camera is calibrated with an object of known size, and the focal length of the camera is fixed, then the ice thickness can be calculated according to the size of the calibration object and the pixel size of the ice section.
在渤海辽东湾导管架平台上对冰厚进行了现场测量,如图3所示。标定物为锥体的防浪孔,孔径H_Diameter为20cm,其在图像上的像素大小为Dh。图像上的冰断面像素大小为T,则实际冰厚Thickness表示为:The ice thickness was measured in situ on the jacket platform in Liaodong Bay, Bohai Sea, as shown in Fig. 3. The calibration object is a cone-shaped anti-wave hole, the hole diameter H_Diameter is 20cm, and its pixel size on the image is Dh. The pixel size of the ice section on the image is T, then the actual ice thickness Thickness is expressed as:
Thickness=20×T/Dh (1-4)Thickness=20×T/Dh (1-4)
则实测出冰厚为12.2cm。The measured ice thickness is 12.2cm.
1.2.冰速及冰向测量1.2. Measurement of ice speed and direction
冰速和冰向测量与冰厚测量的原理类似。首先,通过安装固定的摄像头拍摄一个相对固定的冰面范围;其次,对测量系统进行标定,计算出标定系数n;然后,捕捉并且跟踪视频中冰面上具有一定特征的点的运动轨迹(如图4所示),通过初始帧和最终帧中特征点的坐标变化,计算出特征点运动经过的像素点的长度s,进而得到海冰的运动距离:The principle of ice speed and ice direction measurement is similar to that of ice thickness measurement. Firstly, a relatively fixed ice range is photographed by installing a fixed camera; secondly, the measurement system is calibrated and the calibration coefficient n is calculated; then, the movement trajectory of points with certain characteristics on the ice surface in the video is captured and tracked (such as As shown in Figure 4), through the coordinate changes of the feature points in the initial frame and the final frame, the length s of the pixel point that the feature point moves through is calculated, and then the motion distance of the sea ice is obtained:
S=n×s (1-5)S=n×s (1-5)
根据前后帧的数目,得到运行的时间t,进而得到冰的运行速度:According to the number of frames before and after, the running time t is obtained, and then the running speed of the ice is obtained:
假设图像上X轴方向为0°,初始帧特征点的坐标为(x0,y0),最终帧的特征点坐标为(x1,y1),则冰向角度为:Assuming that the X-axis direction on the image is 0°, the coordinates of the feature points in the initial frame are (x 0 , y 0 ), and the coordinates of the feature points in the final frame are (x 1 , y 1 ), then the ice angle is:
2平台结构响应预测2 Platform structure response prediction
海冰作用下平台的冰振响应是相当复杂的,涉及许多相关环境及结构要素。研究发现,对平台冰振影响最大的因素是海冰速度和厚度。很显然海冰越厚,对平台的冲力越大,从而响应就越大;同样,冰速越快,在撞击平台时,平台所吸收的能量也越大,所以振动响应也随之增大。对于直立结构,一般情况下平台响应与冰速和冰厚成正比,但是在转潮时,平台可能发生稳态振动,导致冰速较小时出现极大响应。因此,本节的统计方法不包括直立结构的稳态振动。The ice vibration response of the platform under the action of sea ice is quite complex, involving many related environmental and structural elements. The study found that the most influential factors on platform ice vibration are sea ice velocity and thickness. Obviously, the thicker the sea ice, the greater the impact on the platform, and the greater the response; similarly, the faster the ice speed, the greater the energy absorbed by the platform when it hits the platform, so the vibration response also increases. For vertical structures, the response of the platform is generally proportional to the ice velocity and ice thickness, but when the tide turns, the platform may vibrate in a steady state, resulting in a maximum response when the ice velocity is small. Therefore, the statistical methods in this section do not include steady-state vibrations of vertical structures.
基于辽东湾锥体平台的实测结果,平整冰作用下平台结构的振动响应幅值与冰厚的平方、冰速成线性关系,其可写作:Based on the actual measurement results of the conical platform in Liaodong Bay, the vibration response amplitude of the platform structure under the action of leveling ice has a linear relationship with the square of the ice thickness and ice velocity, which can be written as:
a=α·hi 2·vi (2-1)a=α·h i 2 ·v i (2-1)
式中,a为结构的振动加速度(gal),α为待定系数,hi为冰厚(cm),vi为冰速(cm/s)。基于现场监测资料分析,可确定出具体平台的待定系数α。where a is the vibration acceleration of the structure (gal), α is an undetermined coefficient, h i is the ice thickness (cm), and v i is the ice velocity (cm/s). Based on the analysis of on-site monitoring data, the undetermined coefficient α of the specific platform can be determined.
3.实施例3. Example
以渤海某海域导管架平台监测为例:Take the jacket platform monitoring in a sea area of the Bohai Sea as an example:
根据海冰监测情况将冰振响应传感器、水温剖面监测传感器、视频监测器及风速仪安装到平台相应位置(如附图1所示)。主控机、解码开发板及上位机已经统一设计为主控系统,在系统外部留有响应接口。将水温剖面监测传感器、视频监测器及风速仪用导线将数据输出端连接至主控系统上控制板预留接口,冰振响应传感器输出端与主控机、解码开发板预留接口连接。解码开发板的输出端与主控板连接,主控板输出端与上位机连接均已在主控系统内连接,无需进行连接操作。According to the sea ice monitoring situation, the ice vibration response sensor, water temperature profile monitoring sensor, video monitor and anemometer are installed on the corresponding positions of the platform (as shown in Figure 1). The main control computer, the decoding development board and the upper computer have been unifiedly designed as the main control system, and a response interface is left outside the system. Connect the data output end of the water temperature profile monitoring sensor, video monitor and anemometer to the reserved interface on the control board of the main control system, and the output end of the ice vibration response sensor to the reserved interface of the main control unit and the decoding development board. The output terminal of the decoding development board is connected to the main control board, and the connection between the output terminal of the main control board and the host computer has been connected in the main control system, and no connection operation is required.
现场监测工作时,在主控机上先对操作软件进行设定:设定冰振响应传感器精度;视频监测器自动采集时间及焦距等;水温剖面监测传感器设置时钟,采样间隔,采样脉冲长短,起始结束时间等。When on-site monitoring work, first set the operating software on the main control machine: set the accuracy of the ice vibration response sensor; automatically collect the time and focal length of the video monitor; set the clock, sampling interval, sampling pulse length, etc. start and end time etc.
在设备调试完成之后,主控系统将将冰振响应传感器、水温剖面监测传感器、视频监测器及风速仪采集到数据进行前期处理、存储并通过网络进行远程传输。实现数据本地保持及远程传输。After the equipment debugging is completed, the main control system will pre-process, store and remotely transmit the data collected by the ice vibration response sensor, water temperature profile monitoring sensor, video monitor and anemometer. Realize data local storage and remote transmission.
通过对实测的平台冰振加速度数据的整理统计,发现在一定冰厚下,平台冰振加速度和冰速呈一定的线性关系。利用2009-2013三年的冬季平台冰振响应监测数据,分析某平台冰振响应与冰厚、冰速的关系,如图5所示。Through the statistics of the measured platform ice vibration acceleration data, it is found that under a certain ice thickness, the platform ice vibration acceleration and ice speed have a certain linear relationship. Using the ice vibration response monitoring data of the platform in winter from 2009 to 2013, the relationship between the ice vibration response, ice thickness and ice velocity of a certain platform is analyzed, as shown in Figure 5.
基于以上统计结果,利用2-1式,可以推算出不同冰厚条件下某平台冰振加速度响应预报模型中对应的待定系数α,如表1所示。Based on the above statistical results, using Equation 2-1, the corresponding undetermined coefficient α in the ice vibration acceleration response prediction model of a platform under different ice thickness conditions can be calculated, as shown in Table 1.
表1 1平台不同冰厚下对应的系数αTable 1 Corresponding coefficient α under different ice thickness of platform 1
以上实施方式仅用于说明本发明,而并非本发明的限制,有关技术领域的普通技术人员,在不脱离本发明的精神和范围的情况下,可以作出变化和变形,因此所有等同的技术方案也属于本发明的范畴。The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Those of ordinary skill in the relevant technical field can make changes and deformations without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions Also belong to the category of the present invention.
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