JP2009061901A - Monitoring method, and its device and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a monitoring method for monitoring a degree of damage to a point where a physical quantity is not measured, on part of a hull structural material and/or an equipment product, and to provide its device and program. <P>SOLUTION: The monitoring method comprises a step of acquiring impact response data, a step of measuring an amount of strain produced at a selective point on part of the hull structural material and/or the equipment product, a step of estimating an explosion position in accordance with information for the measured amount of strain, a step of estimating the amount of strain produced on part of the hull structural material and/or the equipment product in accordance with the estimated explosion position, the information of the measured amount of strain and the impact response data, and determining a degree of damage to part of the hull structural material and/or the equipment product in accordance with the information for the amount of strain, and a step of outputting information for the determination result. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a monitoring method for monitoring the degree of damage to a hull structural material and / or equipment of a ship, an apparatus and a program therefor.

  As a conventional hull condition monitoring and control device, “When the ship is in operation, the acceleration and longitudinal bending stress data obtained by the acceleration sensor attached to the bow and the longitudinal bending stress meter attached to the upper deck are always monitored. In the monitoring and control device of the hull state to be analyzed and monitored, when excessive data exceeding the alarm reference value is measured by the data monitoring device, a voice alarm is output by the voice alarm output device incorporating the voice data and at the same time automatically There has been proposed a device including a propulsion device, a propulsion control device that controls the rudder, and a rudder angle control device so that the data is restored to normal values (see, for example, Patent Document 1).

  In addition, as a general element of hull strength monitoring, and an element to be monitored according to the purpose, `` safe ship operation is performed so that the movement and load of the ship during navigation do not enter the dangerous area, and It is achieved by a system that always checks whether there is a possibility of occurrence of damage to the hull structural member ”(see Non-Patent Document 1, for example).

JP-A-8-175487 Japan Society of Shipbuilding, “Considering Safety of Aged Ships”, Hull Structure Committee DA-WG Report (1995), Chapters 6-7

  When a ship is exposed to underwater explosions such as mines and torpedoes, the shock may cause damage to the hull structural materials and equipment such as equipment installed on the hull, causing damage. In recent years, the demand for damage resistance of hull structural materials and equipment against external impacts has increased, and from the viewpoint of ensuring the safety of crew members, the damage status of hull structural materials and equipment caused by underwater explosions has been slightly increased. However, it is necessary to grasp quickly and take countermeasures.

In general, when exposed to an underwater explosion, the crew checks the hull structure materials and equipment for damage and malfunctions by visual inspection (equipment confirmation of operation, etc.). Since it takes time to inspect materials and equipment, it may delay the discovery of important (dangerous) damage and malfunctions.
For this reason, a sensor that measures some physical quantity (such as acceleration) is attached to the hull structural materials and equipment in advance to monitor the condition, and an alarm is issued when an impact exceeding the threshold is received, or when a damage or malfunction occurs. A monitoring device that emits light may be provided (for example, see Patent Document 1). By using these monitoring devices, it is possible to grasp in advance the degree of damage and the location of damage when a ship is impacted. Can be inspected and repaired, leading to improved safety.

  However, the conventional monitoring device can measure only the impact response of a hull structure material or equipment directly attached with a sensor for measuring a physical quantity. Therefore, in order to increase the accuracy of state monitoring, it is necessary to attach sensors to many hull structural materials and equipment, resulting in high costs. Conversely, if the number of sensor mounting locations is reduced in order to reduce costs, there is a problem that the hull structural materials and equipment that can monitor the state are limited.

  The present invention has been made in order to solve the above-described problems, and is capable of monitoring the degree of damage in a part where a physical quantity is not measured among the respective parts of the hull structural material and / or equipment. It is an object to obtain a method, an apparatus thereof, and a program.

  The monitoring method according to the present invention is a monitoring method for monitoring the degree of damage to a hull structural material and / or equipment of a ship, and a physical quantity generated in each part of the hull structural material and / or equipment due to an impact of an explosion, A step of acquiring impact response information obtained according to a plurality of explosion positions and one or a plurality of explosion powers at each explosion position, and occurred at an arbitrary position among the respective parts of the hull structural material and / or equipment. Based on the step of measuring a physical quantity, the step of estimating an explosion position based on the measured physical quantity information, the estimated explosion position, the measured physical quantity information, and the impact response information, the hull structure The physical quantity generated in each part of the material and / or equipment is estimated, and the degree of damage of each part of the hull structural material and / or equipment is determined based on the information on the physical quantity. Those having the steps of constant, and outputting the information of the determination result.

  A program according to the present invention causes a computer to execute the monitoring method.

  The monitoring device according to the present invention is a monitoring device for monitoring the degree of damage to the hull structural material and / or equipment of a ship, and is a physical quantity generated in each part of the hull structural material and / or equipment by the impact of an explosion. A storage unit that stores in advance a plurality of explosion positions and impact response information obtained in accordance with one or a plurality of explosion powers at each explosion position, and any of the respective parts of the hull structural material and / or equipment A measurement unit that measures a physical quantity generated at a location, an explosion position calculation unit that estimates an explosion position based on the physical quantity measured by the measurement unit, an estimated explosion position estimated by the explosion position calculation unit, and the measurement unit Based on the measured physical quantity of any location and the impact response information, estimate the physical quantity generated in each part of the hull structural material and / or equipment, and based on the information on the physical quantity In which the degree of damage of each part of the body structural member and / or equipment and a determining damage level determining section.

  Further, in the monitoring device according to the present invention, the damage level determination unit estimates an explosion power based on the estimated explosion position and a physical quantity at an arbitrary position measured by the measurement unit, and the plurality of explosion positions And physical quantities generated in each part of the hull structural material and / or equipment based on the estimated explosion power and the estimated response position corresponding to the estimated explosion position among the plurality of explosion response information. It is estimated and the degree of damage of each part of the hull structural material and / or equipment is determined based on the information on the physical quantity.

  Further, in the monitoring device according to the present invention, the damage level determination unit includes the hull structural material corresponding to the estimated explosion position among impact response information corresponding to the plurality of explosion positions and a predetermined explosion power. Information on physical quantities generated in each part of the equipment is acquired, and based on the acquired information on the physical quantities and the physical quantities at arbitrary locations measured by the measuring unit, The generated physical quantity is estimated, and the degree of damage of each part of the hull structural material and / or equipment is determined based on the information on the physical quantity.

  In the monitoring device according to the present invention, the storage unit stores in advance damage determination information indicating a degree of damage according to the physical quantity for each part of the hull structural material and / or equipment, and the damage The level determination unit determines the degree of damage of each part of the hull structural material and / or equipment based on the damage determination information and the information on the estimated physical quantity.

  In the monitoring device according to the present invention, the measurement unit measures at least three or more of the parts of the hull structure material and / or equipment, and the explosion position calculation unit is configured such that each measurement unit has an impact. The explosion position is estimated by using the time difference when the physical quantity is measured and the propagation speed of the impact.

  The monitoring apparatus according to the present invention further includes an impact level determination unit that determines whether or not an impact has occurred based on the physical quantity measured by the measurement unit, and the damage level determination unit includes the impact level determination unit that is When the occurrence is determined, the degree of damage of each part of the hull structural material and / or equipment is determined.

  In the monitoring device according to the present invention, the measuring unit is a strain gauge that measures strain generated by an explosion impact of the hull structural material and / or equipment.

  In the monitoring device according to the present invention, the measurement unit is an acceleration sensor that measures acceleration of vibration generated by an explosion impact of the hull structural material and / or equipment.

  The present invention measures the physical quantity generated in any part of each part of the hull structural material and / or equipment, estimates the explosion position based on the acquired physical quantity information, the estimated explosion position, and the measured physical quantity The physical quantity generated in each part of the hull structural material and / or equipment is estimated based on the information on the above and the acquired impact response information, and the damage of each part of the hull structural material and / or equipment is estimated based on the information on the physical quantity. By determining the degree, it is possible to monitor the degree of damage of the part where the physical quantity is not measured among the respective parts of the hull structural material and / or equipment.

Embodiment 1 FIG.
The monitoring device according to the present invention monitors the degree of damage to the hull structural material and / or equipment of a ship. Hereinafter, in the first embodiment, a ship moving on the sea surface is a monitoring object, and the degree of damage to the ship's hull structural material due to an impact caused by an underwater explosion is monitored using a strain gauge (described later). explain.

  FIG. 1 is a configuration block diagram of a monitoring apparatus according to Embodiment 1 of the present invention. In FIG. 1, the monitoring device 1 according to the first embodiment determines a strain gauge 10 that is a measurement unit that measures strain generated by the impact of an explosion of a hull structural material, a data processing unit 11, and whether or not an impact has occurred. An impact level determination unit 12, an explosion position calculation unit 13 that estimates a point where an underwater explosion has occurred (hereinafter referred to as an “explosion position”), and a memory that stores impact response information (data) and damage determination information (data) to be described later Part 14, a damage level determination part 15 that determines the degree of damage of each part of the hull structural material, and an output part 16 that outputs information of the determination result.

  At least three strain gauges 10 are installed at the strain gauge side points (described later) of the hull structure material, and detect the deformation (strain) of the material when an external force is applied to the material of the hull structure material. To the data processing unit 11. For example, an electric resistance type strain gauge changes its electric resistance in accordance with the deformation of the material. The measurement point at which the strain gauge 10 is installed has a large impact response (strain response) with respect to underwater explosions at various positions, for example, by comparing the results of impact response calculation described later, and depends on the point of occurrence of the underwater explosion. Select several points to several tens of points where the difference in response is large, and set it as the strain measurement point of the hull structural material. The strain gauge 10 is affixed to the set measurement point, and the strain value is constantly monitored during operation by the operation described later. As the number of measurement points increases, the measurement accuracy improves, but the cost also increases. Therefore, the most cost-effective number of measurement points is set.

  The data processing unit 11 acquires a strain response (for example, an electric resistance value) from each strain gauge 10, respectively, performs a process such as sampling, and converts each strain response into a digital data signal (hereinafter, referred to as “digital data signal”). Data based on strain response is called “strain response data”). The impact level determination unit 12 receives strain response data from the data processing unit 11 and generates an underwater explosion near the ship 2 based on strain response data input from the data processing unit 11 by an operation described later. Judging. The explosion position calculation unit 13 estimates the explosion position using the time difference between the measurement times of at least three or more strain gauges 10 and the propagation speed of the impact by an operation described later. The storage unit 14 is a database (DB) configured by a storage device such as an HDD (Hard Disk Drive), for example, and stores impact response data and damage determination data described later in advance. The damage level determination unit 15 receives the explosion position information estimated by the explosion position calculation unit 13 and the strain response data from the data processing unit 11, and operates as described later based on the information stored in the storage unit 14. Thus, the degree of damage of each part of the hull structural material is determined, and information on the determination result is output to the output unit 16. The output unit 16 includes, for example, a liquid crystal display, a speaker, and the like, and outputs information on the determination result input from the damage level determination unit 15.

  Here, the impact level determination unit 12, the explosion position calculation unit 13, and the damage level determination unit 15 may be configured by hardware such as a circuit device, or may be a CPU (Central Processing Unit) or a microcomputer. It can also be configured as software executed by a simple arithmetic device. When implemented as software, ROM (Read Only Memory), HDD (Hard Disk Drive), etc. store the program that realizes the functions of these units, and an arithmetic device such as a CPU or microcomputer reads the program, It can be configured by executing processing corresponding to the function of each unit in accordance with the instructions of the program. Although each component is configured as a separate component here, for example, processing based on a program performed by each component may be performed by one arithmetic device.

  With such a configuration, the monitoring device 1 in the present embodiment measures the strain generated at the measurement point in each part of the hull structural material, estimates the explosion position based on the strain response measured by the strain gauge 10, and estimates Based on the explosion position, the measured strain response data, and the impact response data stored in advance, the strain value generated in each part of the hull structure material is estimated, and the degree of damage of each part of the hull structure material is determined. Then, the information of the determination result is output to the output unit 16. Details of such an operation will be described below with reference to FIGS. 3 to 8 and divided into (1) impact response calculation, (2) damage determination level setting, and (3) damage degree determination.

(1) Impact response calculation First, the underwater explosion phenomenon will be described. For example, when a glaze such as a torpedo or mine explodes in water, an explosion phenomenon occurs in the following order.
(i) A shock wave is generated.
(ii) Gas bubbles (high-temperature, high-pressure bubbles) are generated.
(iii) A shock wave propagates in water (this shock wave is called "Shock Wave").
(iv) The gas bubble repeats expansion and contraction due to the action of the high-pressure gas bubble and the water pressure. At this time, a shock wave is generated (this shock wave is called “Bubble Pulse”).
(v) A water column stands when a gas bubble rises above the water surface (bubble jet (registered trademark) phenomenon).
When the explosion location where the explosion occurred is at a long distance (far-water underwater explosion) from the hull, only the phenomena (i) and (iii) should be considered. To solve such a shock wave (shock wave) propagating in water (fluid) and the hull (structure) (called a structure-fluid coupling problem), an explicit FEM analysis is generally used.

  Next, the behavior of the hull when exposed to a long-distance underwater explosion will be described. First, as described above, when an underwater explosion occurs, a shock wave reaches the hull. The hull is lifted up and down by this shock wave. In addition, vibration is generated in the hull structural material in contact with the fluid by shock waves. And the vibration which generate | occur | produced in the hull structure material propagates through each structure part, and a vibration is transmitted to an equipment, an electronic device, etc. The vibration may cause short-circuiting of the wirings mounted on the equipment and the electronic device, or missing parts. In the FEM analysis, calculation considering shock waves is performed, and the strain and acceleration of the hull structural material and the acceleration of the equipment are obtained.

FIG. 2 is a diagram for explaining an underwater explosion analysis method using Dytran. As an example of the FEM analysis method described above, the procedure of an underwater explosion analysis method using general-purpose software MSC.Dytran will be described with reference to FIG.
(i) First, a detailed structural model (FEM model) of the hull for FEM analysis is created.
(ii) As the detonation conditions, set the amount of glaze (explosion power) and detonation position (explosion position).
(iii) Launch the underwater explosion analysis program and determine the impact pressure acting on the hull skin.
(iv) FEM nonlinear analysis is performed using the obtained impact pressure as input, and the strain and acceleration of the hull structural material or the acceleration of the equipment is calculated.

  In the first embodiment, with the explosion position and the shock factor (explosion power) as parameters, the strain values generated at any of a plurality of locations (each part) of the hull structure material of the ship 2 are analyzed by underwater explosion analysis as described above. The calculated result (impact response data) is stored in advance in the storage unit 14. This impact response data will be described next with reference to FIGS.

FIG. 3 is a diagram illustrating the definition of the explosion relative position according to the first embodiment of the present invention, and FIG. 4 is a conceptual diagram of the data structure of impact response data according to the first embodiment of the present invention. As shown in FIG. 3, the explosion position is defined using a relative position from the ship 2, that is, a direction (0 ° to 360 °), a horizontal distance H, and a depth D. And as shown in FIG. 4, the information of the distortion value (impact response) corresponding to each part of the hull structure material calculated | required according to the some shock factor in each explosion position is databaseed.
In the above description, the case where FEM analysis is performed using general-purpose software has been described. However, the present invention is not limited to this, and may be obtained based on other analysis methods, experimental data, or the like.

(2) Setting of Damage Determination Level FIG. 5 is a conceptual diagram of the data structure of damage determination data according to Embodiment 1 of the present invention.
The storage unit 14 stores in advance damage determination data (damage determination information) indicating the degree of damage corresponding to the strain response for each part of the hull structural material. This damage determination data is used to determine the relationship between the level (size) of the strain response and the degree of damage to the hull structural material for each part of the hull structural material that has been subjected to the impact response calculation described above. A range is set. For example, as shown in FIG. 5, safety levels 1 to 4 and 5 levels of danger are set for the strain response generated at the relevant location, and different level determination ranges are set for each part. As a result, it is possible to create a criterion based on the safety factor and importance of each part of the hull structural material.

(3) Degree of damage determination FIG. 6 is a flowchart showing an operation of damage degree determination according to Embodiment 1 of the present invention, and FIG. 7 is a diagram for explaining a method for estimating an explosion relative position according to Embodiment 1 of the present invention. FIG. 8 is a diagram showing a difference in arrival time of shock waves according to Embodiment 1 of the present invention. The damage determination operation will be described below with reference to FIGS. 7 and 8 based on the flowchart of FIG.

(S101)
The strain gauge 10 at each measurement point always detects the strain at the measurement point of the hull structure material, and inputs the strain response to the data processing unit 11. The data processing unit 11 converts the input strain response into digital data, and outputs it to the impact level determination unit 12 and the damage level determination unit 15 as strain response data.

(S102)
Next, the impact level determination unit 12 determines that an underwater explosion has occurred in the vicinity of the acquired strain response data at each measurement point, for example, when the strain response at any of the measurement points exceeds a predetermined threshold. Yes (judgment of impact occurrence). The determination of the occurrence of an explosion is not limited to this. For example, the occurrence of an underwater explosion is determined when the strain response at a plurality of locations exceeds a threshold value, or when the average value of each measurement point exceeds a predetermined threshold value. May be.

(S103)
When the impact level determination unit 12 determines that an underwater explosion has occurred, the explosion position calculation unit 13 estimates the explosion position of the explosion. The explosion position is estimated by using, for example, strain responses measured at at least three measurement points, and using the time difference at which each measurement point measures strain due to impact and the propagation speed of the impact, Is estimated. That is, as shown in FIG. 7, since the installation position of the strain gauge 10 is known, the relative position (L1 to L3) between each strain gauge 10 and the explosion position is obtained, so that the explosion position is relative to the ship 2. The position (direction, horizontal distance H, depth D) can be calculated. As shown in FIG. 8, the relative distances (L1 to L3) are calculated as the difference in arrival time of the impact response at each strain gauge 10 when the strain response exceeds a predetermined threshold value or based on the generation time of the maximum value. Since the speed at which the shock wave propagates in water is about 1500 m / s, the relative distance is calculated by obtaining the distance difference between each strain gauge 10 and the explosion position by multiplying this speed by the time difference.

(S104)
Next, the damage level determination unit 15 uses the estimated explosion of the impact response data stored in the storage unit 14 based on the explosion position estimated by the explosion position calculation unit 13 (hereinafter referred to as “estimated explosion position”). Select the calculation result at the explosion position closest to the position.

(S105)
Then, the strain response data measured by the strain gauge 10 and the impact response data are collated (pattern collation), and among the plurality of shock factors at the selected explosion position, the calculation result of the strain value and each strain gauge 10 measure. Estimate the shock factor closest to the strain response. Thus, the shock response (strain value) of each part of the hull structural material can be obtained from the shock response data at the estimated shock factor and the estimated explosion position.

(S106)
Next, the damage level determination unit 15 compares the strain value of each part of the obtained hull structural material with the damage determination data shown in FIG. 5 and performs damage level determination (safety level 1 to 4, danger). The information of the damage determination result is output to the output unit 16.

(S107)
The output unit 16 outputs information on the input determination result using a display, sound, or the like. At this time, for example, it is possible to visually determine the estimated state of damage by changing the color according to the determination level of the risk level and displaying it on the hull map.

  As described above, in the first embodiment, the strain generated at the measurement point is measured, the explosion position is estimated based on the strain response data, the estimated explosion position, the measured strain response data, the impact response data, Based on this, we estimate the strain value generated in each part of the hull structure material, and determine the degree of damage of each part of the hull structure material based on this strain value. It is possible to obtain a strain value due to an impact at a nonexistent location, determine the degree of damage, and show information on the determination result to the occupant.

  Further, it is possible to visually determine the estimated situation of damage by determining the degree of damage to the underwater explosion and presenting the result visually or by voice to the occupant. Therefore, passengers can grasp the estimated situation of damage more quickly and accurately, and as a result, they can preferentially conduct inspection surveys of more dangerous parts, detect dangerous parts early, repair, etc. Can greatly contribute to the improvement of safety.

  Furthermore, when creating the damage criterion (damage determination data), the safety can be further improved by creating the criterion based on the importance of each part of the hull structural material.

  Moreover, since the strain value of the part which is not directly measured can be calculated | required, the number of the strain gauges 10 (measurement sensor) to arrange | position can be reduced, and the installation cost and the running cost can be reduced. Moreover, since the measurement system can be simplified by reducing the number of strain gauges 10, the measurement system can be easily maintained, leading to an improvement in reliability.

  In the first embodiment, the case where the output unit 16 is provided and the information of the determination result of the damage level determination unit 15 is output by the output unit 16 has been described. However, the present invention is not limited thereto, and the output unit 16 is not limited thereto. For example, the information of the determination result may be output to another information processing apparatus or the like, or may be sequentially stored in an external storage device or the like.

  Further, the impact response (strain value) obtained by the damage level determination unit 15 is sequentially stored in the storage unit 14 or an external storage device, for example, and managed as a damage history of the ship 2 for equipment maintenance / aging deterioration diagnosis and the like. May be used.

  In the first embodiment, the case where each part of the hull structural material of the ship 2 is monitored for the degree of damage using the strain gauge 10 has been described. However, the present invention is not limited to this, and the ship 2 The strain gauge 10 may be affixed to the equipment to be mounted on and the degree of damage may be monitored by the same operation.

Embodiment 2. FIG.
In the first embodiment, the case has been described in which the degree of damage to the hull structure material of the ship 2 due to the impact of the underwater explosion is monitored. However, in the second embodiment, the equipment fitted to the ship 2 is underwater explosion. A case will be described in which the degree of damage received by an impact due to is monitored using an acceleration sensor.

  FIG. 9 is a configuration block diagram of a monitoring apparatus according to Embodiment 2 of the present invention. In FIG. 9, the monitoring device 1 according to the second embodiment is provided with an acceleration sensor 20 that measures the acceleration of vibration generated by the impact of the explosion of the ship equipment, instead of the strain gauge 10 of the first embodiment described above. The configuration. Other configurations are the same as those in the first embodiment.

  At least three acceleration sensors 20 are installed at the acceleration sensor measurement points (described later) of the equipment, detect the acceleration of vibration of the equipment, and output the acceleration response to the data processing unit 11. The measurement point where the acceleration sensor 20 is installed has a large impact response (acceleration response) with respect to underwater explosions at various positions, for example, by comparing the results of impact response calculation, similar to the strain measurement point described above. Also, several to several tens of positions where the difference in response depending on the point of occurrence of the underwater explosion is selected are set as the acceleration sensor measurement points of the equipment, and the acceleration sensor 20 is attached to the measurement points.

  The data processing unit 11 acquires acceleration responses from the respective acceleration sensors 20, respectively, performs processing such as sampling, and converts each acceleration response into a digital data signal (hereinafter, data based on the acceleration response is referred to as data). "Acceleration response data"). The impact level determination unit 12 receives the acceleration response data from the data processing unit 11, and determines the occurrence of an underwater explosion near the ship 2 based on the acceleration response data input from the data processing unit 11. The explosion position calculation unit 13 estimates the explosion position using the time difference between the measurement times of at least three acceleration sensors 20 and the propagation velocity of the impact.

  The storage unit 14 of the second embodiment replaces the impact response data of the strain values in the respective parts of the hull structure material described in the first embodiment with the explosion position and the shock factor as parameters, and the equipment of the ship 2 The impact response data calculated by the underwater explosion analysis is stored as the acceleration value generated in each part. Further, the storage unit 14 replaces the damage determination data indicating the degree of damage according to the strain response described in the first embodiment with the damage indicating the degree of damage according to the acceleration response for each part of the equipment. Determination data is stored.

  The damage level determination unit 15 receives the explosion position information estimated by the explosion position calculation unit 13 and the acceleration response data from the data processing unit 11, and based on the information stored in the storage unit 14, The degree of damage of each part is determined, and information on the determination result is output to the output unit 16. The output unit 16 includes, for example, a liquid crystal display, a speaker, and the like, and outputs information on the determination result input from the damage level determination unit 15.

  With such a configuration, the monitoring device 1 according to the second embodiment measures the acceleration generated at the measurement point in each part of the equipment, and based on the acceleration response measured by the acceleration sensor 20, the first embodiment described above. With the same operation, the explosion position is estimated. Based on the estimated explosion position, the measured acceleration response data, and the impact response data stored in advance, the value of acceleration generated in each part of the hull structural material is estimated. Determine the degree of damage of each part of the equipment. Then, the information of the determination result is output to the output unit 16.

  As described above, in the second embodiment, the degree of damage to the equipment equipped on the ship 2 due to the impact caused by the underwater explosion is monitored by using the acceleration sensor 20, and thus the first embodiment and the above-described first embodiment. Similar effects can be obtained.

  In the second embodiment, the case where the degree of damage is monitored for each part of the equipment using the acceleration sensor 20 has been described. However, the present invention is not limited to this, and the hull structural material of the ship 2 is used. Alternatively, the acceleration sensor 20 may be attached, and the degree of damage may be monitored by a similar operation.

  In the first embodiment, the case where each part of the hull structural material is monitored and the case where each part of the equipment is monitored is described in the second embodiment. However, the present invention is not limited to this. It is good also as composition which monitors material and equipment simultaneously. At this time, the strain gauge 10 or the acceleration sensor 20 may be arbitrarily selected as a sensor for measuring a physical quantity generated in each part of the hull structural material and equipment due to the impact of the explosion.

Embodiment 3 FIG.
In the first and second embodiments, shock response data calculated using a plurality of explosion positions and a plurality of shock factors at each explosion position as parameters are used. However, in the third embodiment, a plurality of shock factors are used. Instead, the degree of impact is monitored using one shock factor (reference value) at each explosion position. The configuration in the third embodiment is the same as that in the first embodiment.

  FIG. 10 is a conceptual diagram of a data structure of impact response data according to the third embodiment of the present invention. As shown in FIG. 10, in the storage unit 14 according to the third embodiment, the result calculated using the shock factor as a reference value (for example, 1.0) in the calculation based on the underwater explosion analysis is stored in advance as shock response data. The

  Here, the physical quantity (strain) generated in the hull structural material and / or equipment due to the impact of the explosion is proportional to the shock factor of the explosion. Therefore, in the third embodiment, only the impact analysis calculation result at the reference value is stored as the impact response data, and the impact response data at the reference value is compared with the measured strain response, so that the strain response of each part. Is estimated. Hereinafter, the operation will be described focusing on the differences from the first embodiment.

  By the same operation as that in the first embodiment (S101 to S105), the damage level determination unit 15 selects the calculation result at the explosion position closest to the estimated explosion position. Then, the strain response data (measured value) measured by the strain gauge 10 is collated with the calculation result of the shock factor of the reference value at the selected explosion position, and the relationship (ratio) between the measured value and the calculated value is calculated. Based on the relationship, the impact response (strain value) of each part of the hull structure material at a location where measurement is not performed can be obtained.

  As described above, in the third embodiment, in addition to the effects of the first embodiment described above, it is necessary to calculate the shock response using the shock factor as a parameter by using the shock response data at the shock factor of the reference value. The shock response data stored in the storage unit 14 can be simplified.

  In the third embodiment, the case where the hull structural material is monitored using the strain response with the same configuration as in the first embodiment has been described. However, the present invention is not limited to this, and the second embodiment described above. With the configuration described above, when monitoring the equipment using the acceleration sensor 20, the monitoring may be performed by the same operation using the shock response data calculated with the shock factor as the reference value.

  In the first to third embodiments, the case where the strain gauge 10 or the acceleration sensor 20 is used as a sensor for measuring the physical quantity generated by the impact of the explosion of the hull structural material and / or equipment has been described. For example, other sensors such as a speed sensor may be used. In this case, impact analysis is performed according to the physical quantity measured by the sensor, and the calculation result is stored in the storage unit 14 as impact response data.

1 is a configuration block diagram of a monitoring device according to Embodiment 1 of the present invention. It is a figure explaining the underwater explosion analysis method using Dytran. It is a figure explaining the definition of the explosion relative position which concerns on Embodiment 1 of this invention. It is a conceptual diagram of the data structure of the impact response data which concerns on Embodiment 1 of this invention. It is a conceptual diagram of the data structure of the damage determination data which concerns on Embodiment 1 of this invention. It is a flowchart which shows the operation | movement of the damage degree determination which concerns on Embodiment 1 of this invention. It is a figure explaining the estimation method of the explosion relative position which concerns on Embodiment 1 of this invention. It is a figure which shows the arrival time difference of the shock wave which concerns on Embodiment 1 of this invention. It is a block diagram of the configuration of a monitoring device according to Embodiment 2 of the present invention. It is a conceptual diagram of the data structure of the impact response data which concerns on Embodiment 3 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Monitoring apparatus, 2 ship, 10 Strain gauge, 11 Data processing part, 12 Impact level determination part, 13 Explosion position calculation part, 14 Storage part, 15 Damage level determination part, 16 Output part, 20 Acceleration sensor.

Claims (10)

A monitoring method for monitoring the degree of damage to a ship's hull structural material and / or equipment,
A physical quantity generated in each part of the hull structural material and / or equipment due to the impact of the explosion, acquiring the impact response information obtained in accordance with a plurality of explosion positions and one or more explosion forces at each explosion position;
A step of measuring a physical quantity generated at an arbitrary location in each part of the hull structural material and / or equipment;
Estimating the explosion position based on the measured physical quantity information;
Based on the estimated explosion position, the measured physical quantity information, and the impact response information, the physical quantity generated in each part of the hull structural material and / or equipment is estimated, and the hull is based on the physical quantity information. Determining the degree of damage to each part of the structural material and / or equipment;
And a step of outputting information of the determination result.   A program for causing a computer to execute the monitoring method according to claim 1. A monitoring device for monitoring the degree of damage to a ship's hull structural material and / or equipment,
A storage unit that stores in advance a plurality of explosion positions and impact response information obtained in accordance with one or more explosion powers at each explosion position as physical quantities generated in each part of the hull structural material and / or equipment by the impact of the explosion; ,
A measuring unit for measuring a physical quantity generated in an arbitrary place among the respective parts of the hull structural material and / or equipment;
An explosion position calculation unit that estimates an explosion position based on the physical quantity measured by the measurement unit;
Based on the estimated explosion position estimated by the explosion position calculation unit, the physical quantity at any location measured by the measurement unit, and the impact response information, the physical quantity generated in each part of the hull structural material and / or equipment is estimated. And a damage level determination unit that determines a degree of damage of each part of the hull structural material and / or equipment based on the information on the physical quantity. The damage level determination unit
Based on the estimated explosion position and the physical quantity of any part measured by the measurement unit, the explosion power is estimated,
Based on the impact response information corresponding to the estimated explosion power and the estimated explosion position among the impact response information corresponding to the plurality of explosion positions and the plurality of explosion powers, the hull structural material and / or the equipment Estimate the physical quantity that occurs in each part,
The monitoring device according to claim 3, wherein a degree of damage of each part of the hull structural material and / or equipment is determined based on the physical quantity information. The damage level determination unit
Obtaining physical quantity information generated in each part of the hull structural material and / or equipment corresponding to the estimated explosion position among the impact response information corresponding to the plurality of explosion positions and predetermined explosion power,
Based on the acquired physical quantity information and the physical quantity at any location measured by the measurement unit, estimate the physical quantity generated in each part of the hull structural material and / or equipment,
The monitoring device according to claim 3, wherein a degree of damage of each part of the hull structural material and / or equipment is determined based on the physical quantity information. The storage unit
For each part of the hull structural material and / or equipment, damage determination information indicating the degree of damage according to the physical quantity is stored in advance,
The damage level determination unit
6. The monitoring apparatus according to claim 3, wherein a degree of damage of each part of the hull structural material and / or equipment is determined based on the damage determination information and the estimated physical quantity information. The measuring unit is
Measure at least three of each part of the hull structural material and / or equipment,
The explosion position calculation unit
The monitoring apparatus according to any one of claims 3 to 6, wherein each measurement unit estimates an explosion position using a time difference at which a physical quantity due to an impact is measured and a propagation speed of the impact. An impact level determination unit that determines whether or not an impact has occurred based on the physical quantity measured by the measurement unit,
The damage level determination unit
The monitoring device according to claim 3, wherein when the impact level determination unit determines the occurrence of an impact, the degree of damage of each part of the hull structural material and / or equipment is determined. . The measuring unit is
The monitoring device according to claim 3, wherein the hull structural material and / or equipment is a strain gauge that measures strain generated by an impact of an explosion. The measuring unit is
The monitoring apparatus according to claim 3, wherein the hull structural material and / or the equipment is an accelerometer that measures acceleration of vibration generated by an impact of an explosion.

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