CN108801506A - Semi-submersible type bottom platform stress safety prewarning monitoring system and method - Google Patents

Abstract

The invention discloses a semi-submersible bottom platform stress safety early warning monitoring system. The system mainly includes sensors, wires and a data acquisition monitoring system. The sensor is arranged on the measured component to test the stress value of the measured component in real time; the data acquisition monitoring system The data collected by each sensor is collected in real time, analyzed and displayed. The safety early warning and monitoring method realized based on this can monitor the stress changes caused by the longitudinal bending of various parts of the hull under the condition of water scour of the platform sitting on the bottom in real time, and analyze the stress changes to provide early warning for the safety of the platform. The solution provided by the invention can monitor and warn the stress safety of the semi-submersible bottom platform in real time, so that construction personnel can know the safety status of the entire semi-submersible bottom platform in time, and can take effective measures in time to prevent platform structure damage.

Description

System and method for early warning and monitoring of stress safety of semi-submersible bottom platform

technical field

The invention relates to wind power installation engineering technology, in particular to the monitoring and protection technology of a semi-submersible bottom platform.

Background technique

At present, the installation of offshore wind power is mainly completed by floating cranes and self-elevating lifting platforms. With the rapid development of domestic offshore wind power, the number of existing installation equipment is slightly insufficient, so it is necessary to build or introduce more high-quality cranes One of the better choices is the bottom-mounted lifting platform, which is more popular for its relatively low cost and good stability.

The bottom-sitting installation platform actively sits on the bottom, that is, by adjusting its own weight, the platform sinks slowly and stably to contact the mud surface of the seabed, and uses the support force of the mud surface to install the wind turbine. The bottom-sitting construction can meet the working requirements of the crane to the greatest extent, reduce the impact of weather and sea conditions on the crane work, and create prerequisites for shortening the offshore installation cycle, reducing construction risks, and controlling construction costs. In shallow water areas, the active bottom-sitting operation method does not require pile legs, pile shoes, and lifting and locking devices, which reduces the difficulty of construction technology. The construction cost is similar to that of floating crane ships, and the one-time investment is small. great competitiveness.

Based on the working characteristics of the bottom-sitting platform, the biggest challenge it faces is the scour of the bottom of the ship. When the ship sits on the bottom, the flow velocity and flow pattern of the surrounding water are changed, resulting in a certain degree of seabed scour. It is related to factors such as foundation conditions, ship structure, and tidal current changes. When the scour causes the bottom of the ship to empty, it will cause changes in the stress magnitude and stress distribution of the hull structure. Because the stress on the hull structure is very complex, structural damage and destruction caused by environmental random factors are difficult. It is predicted by theoretical calculation that when the hollowing out reaches a certain level and the strength of the hull cannot withstand the bending moment caused by its own weight and stowage, it may cause damage to the hull structure.

It can be seen that how to effectively monitor the status of the important components of the bottom-mounted ship in real time, and the construction safety of the bottom-mounted ship is a problem that needs to be solved urgently in this field.

Contents of the invention

In view of the problems existing in the monitoring technology of the important component status of the existing semi-submersible bottom platform, a new monitoring and protection technology for the semi-submersible bottom platform is needed.

For this reason, the technical problem to be solved by the present invention is to provide a semi-submersible bottom platform stress safety early warning monitoring system, on this basis, further provide a semi-submersible bottom platform stress safety early warning monitoring method to monitor the bottom in real time Stress changes caused by longitudinal bending of platform hull.

In order to solve the above technical problems, the semi-submersible bottom platform stress safety early warning monitoring system provided by the present invention includes:

A sensor, the sensor is arranged on the component under test, and tests the stress value of the component under test in real time;

wires, the wires are connected to the sensor and the data acquisition and monitoring system;

A data collection and monitoring system, the data collection and monitoring system collects the data collected by each sensor in real time, and analyzes and displays them.

Further, the sensors are arranged at multiple points along the longitudinal direction of the platform deck and/or cabin.

Further, the sensor adopts a vibrating wire sensor, which can be embedded or welded on the component under test.

Further, when the sensor is installed, a protective box and silica gel protection are provided.

Further, the data collection and monitoring system reflects the collection signal to the monitoring screen at set intervals in real time through the collection card, displaying the current stress value and historical stress curve of each sensor.

Further, the data acquisition monitoring system mainly includes:

The data acquisition module collects the monitoring data of each sensor through the acquisition card, and can set the interval time to transmit to the display module;

A display module, used for displaying the received data;

The multi-level early warning value setting module is used to set corresponding multi-level early warning values for different position sensors;

The multi-level analysis and early warning module performs early warning analysis and multi-level alarms for the current stress values of different position sensors collected by the data acquisition module.

Further, the early warning monitoring system also includes an audible and visual alarm system, which is controlled by the data acquisition and monitoring system, and can automatically issue an audible and visual alarm command to the alarm when the monitoring system detects a trigger alarm value.

In order to solve the above technical problems, the semi-submersible bottom platform stress safety early warning monitoring method provided by the present invention monitors the stress changes caused by the longitudinal bending of various parts of the hull of the bottom platform under the condition of water erosion in real time, and analyzes the impact of stress changes on the platform. Security warning.

Further, the early warning monitoring method is based on the calculation of working conditions such as sitting on the bottom, diving, floating, floating, etc., to determine the stress range of the monitoring point, combined with the actual measurement results of the field process test, to determine the multi-level alarm value of the sensors at different positions; The current stress values monitored by sensors at different positions are compared and analyzed with their corresponding multi-level alarm values, and multi-level alarms are performed.

The solution provided by the invention can monitor and warn the stress safety of the semi-submersible bottom platform in real time, so that the construction personnel can know the safety status of the whole semi-submersible bottom platform in time, and can take effective measures in time to prevent the damage of the platform structure.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is the system block diagram of the stress safety early warning and monitoring system of the semi-submersible bottom platform in the example of the present invention;

Fig. 2 is the implementation flowchart of monitoring and early warning to the stress safety of the semi-submersible bottom platform in the example of the present invention.

Detailed ways

In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

According to the case analysis of the accidents that have occurred on the bottom-mounted installation ship, the main reason is that when the ship’s working conditions change, the construction personnel cannot timely understand the change of the ship’s force, which delays the response measures.

Accordingly, this example realizes the early warning of the safety of the hull structure through real-time monitoring of the state of the important components of the hull structure according to the trend of structural force changes, and then can prevent the slightest delay at the very beginning of the danger, and effectively guarantee the safety of the bottom-mounted type. Install ship construction safety.

Based on the above principles, this example scheme specifically monitors the stress changes caused by the longitudinal bending of the hull of the semi-submersible bottom-sitting platform (hereinafter referred to as the platform) under the condition of water erosion in real time, and judges the influence of scour on the platform by analyzing the monitored stress changes , to realize the early warning of the safety of the platform, so that the construction personnel can take effective measures in time to prevent the damage of the platform structure.

Referring to Fig. 1, it shows the composition diagram of the semi-submersible bottom platform stress safety early warning monitoring system 100 provided by this example. The early warning monitoring system 100 can monitor the structural stress of the platform in real time.

As can be seen from the figure, the early warning monitoring system 100 is mainly composed of four parts: a sensor 110, a wire 120, a data acquisition monitoring system 130 and an audible and visual alarm system 140.

Wherein, the sensor 110 is used to monitor the stress value of the location. The sensor 110 is preferably a vibrating wire sensor, which can be embedded or welded on the tested component. Preferably, in this example, several sensors 110 are arranged in the longitudinal direction of the deck and the cabin, and by monitoring the stress at these positions, the longitudinal bending damage that may be caused by the longitudinal water flow of the ship after the hull sits on the bottom can be effectively reflected.

The sensor 110 arranged in this way can effectively avoid problems such as aging and falling off of the adhesive. In addition, it has many advantages such as simple structure, high precision, strong anti-interference ability and low requirements for cables.

In addition, in this solution, the sensor 110 takes measures such as a protective box and silica gel protection during installation.

The wire 120 in this example is used to connect the sensor 110 and the data acquisition and monitoring system 130, so that the data acquired by the sensor 110 is transmitted to the data acquisition and monitoring system 130 in time. The wire 120 preferably uses a marine control flexible cable, which has good corrosion resistance.

The data collection and monitoring system 130 in this example is the data processing and analysis center of the entire control system. The system is based on LabVIEW, which can collect the data collected by each sensor in real time, analyze and display.

The data collection and monitoring system 130 can reflect the collection signal to the monitoring screen at set intervals in real time through the collection card, displaying the current stress value and historical stress curve of each sensor. In this way, it is convenient for the operator to view, and at the same time, the data is directly saved to the local computer, which is convenient for subsequent processing and analysis.

Further, the data acquisition monitoring system 130 mainly includes: a data acquisition module 131, a display module 132, a multi-level early warning value setting module 133, and a multi-level analysis early warning module 134.

Wherein, the data collection module 131 collects the monitoring data of each sensor through the collection card, and can set the interval time to transmit to the display module 132.

The display module 132 is used for displaying the received data. For example, the current stress value and historical stress curve of each sensor can be displayed.

The multi-level early warning value setting module 133 is used for setting corresponding multi-level early warning values for different position sensors. This module determines the stress range of the monitoring point based on the calculation of working conditions such as sitting on the bottom, diving, floating, etc., and then combines the actual measurement results of the field process test to determine the multi-level alarm values of sensors at different positions.

The multi-level analysis and early warning module 134 performs early warning analysis and multi-level alarms respectively for the current stress values and historical stress curves of different position sensors collected by the data acquisition module 131. The multi-level analysis and early warning module 134 compares and analyzes the current stress values of different position sensors collected by the data acquisition module 131 in real time with the multi-level alarm values of different position sensors determined by the multi-level early warning value setting module 133, according to the comparative analysis results different levels of warnings.

The sound and light alarm system 140 in this example is connected with the data acquisition and monitoring system 130, and is used to automatically issue sound and light alarm instructions to the alarm when the monitoring system monitors the trigger alarm value, so that the operator can find danger in time.

The semi-submersible bottom platform stress safety early warning monitoring system 100 formed accordingly, its concrete implementation process of monitoring and early warning to the semi-submersible bottom platform is as follows:

(1) Through finite element calculations, in view of the longitudinal bending damage that may be caused by the water flow along the longitudinal direction of the ship after the hull sits on the bottom, the arrangement positions of the monitoring points are reasonably determined in the longitudinal direction of the deck and cabin. The sensor is set according to the determined layout position, which can be buried or welded at the corresponding position.

(2) Determine the stress range of the monitoring point based on the calculation of working conditions such as sitting on the bottom, diving, floating, and floating, and combine the actual measurement results of the field process test to determine the two-level alarm values of sensors at different positions.

(3) The monitoring system reflects the acquisition signals of each sensor to the monitoring screen at set intervals in real time through the acquisition card, and displays the current stress value and historical stress curve of each sensor; for the current stress value and historical stress curve of sensors at different positions Early warning analysis, if the current stress value of the working sensor reaches or exceeds its corresponding first-level alarm value, a first-level alarm will be triggered. At this time, the current activity should be stopped and measures should be taken in time; if the current stress value of the working sensor reaches or exceeds its corresponding secondary alarm value, a secondary alarm is triggered. At this time, the stress value of the platform structure is relatively dangerous, and the current operation must be stopped and measures must be taken.

(4) Regularly collate the data collected by the monitoring system, and analyze the on-site scour conditions in combination with the working condition records.

It can be seen that the impact of scour on the platform can be effectively judged through this scheme, so that the construction personnel can take effective measures in time to prevent the platform structure from being damaged.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Variations and improvements are possible, which fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (9)

1. semi-submersible type bottom platform stress safety prewarning monitoring system, which is characterized in that including：

Sensor, the sensor are arranged on unit under test, the stress value of real-time testing unit under test；

Conducting wire, the conducting wire connection sensor and data acquisition monitoring system；

Data acquisition monitoring system, the data acquisition monitoring system acquire the data of each sensor acquisition in real time, and carry out Analysis and display.

2. semi-submersible type bottom platform stress safety prewarning monitoring system according to claim 1, which is characterized in that the biography Longitudinal direction multiple spot of the sensor along platform deck and/or cabin is arranged.

3. semi-submersible type bottom platform stress safety prewarning monitoring system according to claim 1, which is characterized in that the biography Sensor uses vibrating string type sensor, can be embedded to or be welded on unit under test.

4. semi-submersible type bottom platform stress safety prewarning monitoring system according to claim 1, which is characterized in that the biography Setting protecting box and silica gel protected when sensor is installed.

5. semi-submersible type bottom platform stress safety prewarning monitoring system according to claim 1, which is characterized in that the number Each biography is shown in real time by acquisition signal to set interval time reflection to monitoring screen by capture card according to collection monitoring system The current stress value and history stress curve of sensor.

6. semi-submersible type bottom platform stress safety prewarning monitoring system according to claim 1, which is characterized in that the number Include mainly according to collection monitoring system：

Data acquisition module acquires the monitoring data of each sensor by capture card, can set interval time be transmitted to it is aobvious Show module；

Display module, the data for receiving are shown；

Multistage early warning value setting module, for for the corresponding multistage early warning value of different location sensor setting；

Multi-scale analysis warning module, for data collecting module collected to the current stress value of different location sensor carry out respectively Early warning analysis and progress Multi-stage alarming.

7. semi-submersible type bottom platform stress safety prewarning monitoring system according to claim 1, which is characterized in that described pre- Alert monitoring system further includes acoustooptic alarm system, and the acoustooptic alarm system is controlled by data acquisition monitoring system, can monitor When system monitoring is to triggering alarming value, sound-light alarm instruction is assigned to alarm automatically.

8. semi-submersible type bottom platform stress safe early warning monitoring method, which is characterized in that by monitoring bottom platform in real time in water Stream Scouring Condition pontoon each position indulge it is curved caused by stress variation, and analyze stress variation and early warning carried out to the safety of platform.

9. semi-submersible type bottom platform stress safe early warning monitoring method according to claim 8, which is characterized in that described pre- Alert monitoring method is based on sitting the condition calculatings such as bottom, dive, floating, floating, the range of stress of monitoring point is determined, in conjunction with site technique The measured result of experiment determines the Multi-stage alarming value of different location sensor；Pass through arrive the Sensor monitoring of different location The current corresponding Multi-stage alarming value of stress value compares and analyzes, and carries out Multi-stage alarming.