JP2006029925A - Sloshing evaluation system, sloshing evaluation program and record medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sloshing evaluation system, sloshing evaluation program and record medium capable of applying a proper sloshing measure. <P>SOLUTION: The sloshing evaluation system for evaluating sloshing due to earthquake in a plurality of tanks 41 containing liquid executes first evaluation calculating wave height of liquid surface due to sloshing at each of tanks 41 from earthquake occurrence information in real time, and second evaluation calculating wave height of liquid surface due to sloshing at each of tanks 41 from the detection signal of a seismometer 16. The information concerning the wave height calculated in the first evaluation is transmitted to the institution administrating the tanks. When the wave height calculated in the second evaluation is different from the wave height calculated in the first evaluation, the information concerning the wave height is corrected from the wave height calculated in the second evaluation and transmitted to the administrating institution. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sloshing evaluation system for evaluating sloshing such as an oil tank, a sloshing evaluation program, and a recording medium.

Conventionally, as a device for measuring sloshing of an oil tank or the like, as described in, for example, Japanese Patent Laid-Open No. 2000-9516, the height of the liquid level in the tank storing the liquid is measured and the liquid level value is output. A liquid level measuring device that detects the occurrence of an earthquake and outputs an earthquake detection signal, a recorder that records and saves the liquid level level in synchronization with the output timing of the earthquake detection signal, and a recording An apparatus is known that includes an analyzer that estimates liquid level displacement during an earthquake from stored liquid level values. This device attempts to accurately estimate the rise in the liquid level in the storage tank due to the sloshing phenomenon at the time of an earthquake by estimating the liquid level displacement based on the recorded and leveled liquid level value.
JP 2000-9516 A

  With such a device, there is a problem that it is not possible to take appropriate measures against sloshing at a tank base where a large number of tanks are installed. For example, in order to estimate the liquid level displacement for all of a large number of tanks installed in the tank base, it is necessary to install liquid level measuring devices in all the tanks. For this reason, enormous costs are required to estimate the liquid level displacement, and sloshing estimation cannot be performed easily. Even if the liquid level displacement can be accurately estimated at an oil tank base or the like, it is difficult to appropriately take measures against the sloshing unless the sloshing is estimated before the arrival of the seismic wave.

  Therefore, an object of the present invention is to provide a sloshing evaluation system, a sloshing evaluation program, and a recording medium that can take appropriate measures against sloshing.

  That is, the sloshing evaluation system according to the present invention is a sloshing evaluation system that evaluates sloshing due to an earthquake for a plurality of tanks that contain liquids, and acquires earthquake information of real-time earthquake occurrence information at a remote location. Means, earthquake detection means for detecting a vibration caused by an earthquake in the tank, and calculating a velocity response spectrum based on the earthquake occurrence information, and using the velocity response spectrum, a wave of the liquid surface due to sloshing for each of the plurality of tanks. First response means for calculating a high value and a speed response spectrum based on a detection signal of the earthquake detection means, and using the speed response spectrum, a peak value of a liquid level due to sloshing is calculated for each of the plurality of tanks. Calculated by the second evaluation means and the first evaluation means Information on the peak value is transmitted to the tank management organization, and when the peak value calculated by the second evaluation means is different from the peak value calculated by the first evaluation means, the second evaluation means And transmitting means for correcting information related to the peak value based on the calculated peak value and transmitting the corrected peak value to the tank management organization.

  The sloshing evaluation program according to the present invention is a sloshing evaluation program that causes a computer to execute sloshing evaluation processing due to earthquakes in a plurality of tanks, and obtains a speed response spectrum based on real-time earthquake occurrence information in an earthquake that occurred in a remote place. The first evaluation process for calculating the crest value of the liquid level due to sloshing for each of the plurality of tanks using the speed response spectrum, and the speed based on the detection signal of the seismometer installed in the site of the tank Calculating a response spectrum, and using the velocity response spectrum, the second evaluation process for calculating the crest value of the liquid level due to sloshing for each of the plurality of tanks, and information relating to the crest value calculated by the first evaluation process And send it to the tank management agency. When the peak value calculated by the evaluation process is different from the peak value calculated by the first evaluation process, information on the peak value is corrected based on the peak value calculated by the second evaluation process to manage the tank It is characterized by causing the computer to execute a transmission process for transmitting to an institution. The recording medium according to the present invention is characterized in that this sloshing evaluation program is recorded.

  According to these inventions, the speed response spectrum is calculated based on real-time earthquake occurrence information, and the sloshing evaluation is performed by calculating the crest value of the liquid level in the tank using the speed response spectrum. Therefore, sloshing evaluation can be performed before the seismic wave reaches the tank, and measures against sloshing can be started in advance. In addition, since evaluation regarding sloshing is performed for a plurality of tanks at the same time, the state of the tanks can be collectively managed, such as when a large number of tanks are installed like an oil tank base, and management work can be performed efficiently. Further, it is possible to calculate the crest value in the tank due to sloshing without installing a seismometer for each of the plurality of tanks, and it is possible to construct an evaluation system at a low cost. Furthermore, in addition to primary evaluation of sloshing based on real-time earthquake occurrence information, the primary evaluation can be corrected by detecting the actual vibration and performing secondary evaluation, and appropriate sloshing can be handled. .

  The sloshing evaluation system according to the present invention is provided in the tank, and is activated when the peak value exceeds a predetermined value by the first evaluation means, and the tank is configured so that the peak value is lowered. Sloshing prevention means for changing the sloshing period is provided.

  The sloshing evaluation program according to the present invention transmits a start signal to a sloshing prevention means for changing the sloshing cycle of the tank when the peak value is evaluated to exceed the predetermined value by the first evaluation processing. Then, the computer is caused to execute a sloshing prevention process for reducing sloshing. The recording medium according to the present invention is characterized in that this sloshing evaluation program is recorded.

  According to these inventions, the crest value is calculated by calculating the crest value of the tank based on the real-time earthquake occurrence information, and when the crest value exceeds the predetermined value, the sloshing prevention means is activated to activate the crest value. The sloshing cycle of the tank can be changed so as to be low. For this reason, it is possible to prevent the liquid level due to the sloshing from becoming higher by changing the sloshing period in advance before the seismic wave reaches the tank.

  The sloshing evaluation system according to the present invention is characterized in that the transmitting means transmits at least tank peak value information and overflow tank information as information relating to the peak value.

  The sloshing evaluation program according to the present invention is characterized in that the transmission process transmits at least tank peak value information and overflow tank information as information on the peak value. The recording medium according to the present invention is characterized in that this sloshing evaluation program is recorded.

  According to these inventions, by transmitting the tank peak value information and overflow tank information to the management organization, the management organization can easily determine the order in which the tank sloshing measures should be taken, and in the event of an emergency situation, Countermeasures can be implemented efficiently and effectively.

  According to the present invention, it is possible to take an appropriate countermeasure against sloshing when an earthquake occurs.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a schematic configuration diagram of a sloshing evaluation system according to an embodiment of the present invention.

  As shown in FIG. 1, the sloshing evaluation system 1 according to the present embodiment is a system that performs sloshing evaluation of a plurality of tanks that are subject to sloshing evaluation, and includes a control unit 10, an earthquake occurrence information acquisition unit 12, a liquid height information input. Unit 14, seismometer 16, data input unit 18, monitor 20, speaker 22, communication unit 24, and sloshing prevention unit 26. The plurality of tanks that are subject to sloshing evaluation constitute, for example, an oil tank base, and a liquid such as oil is accommodated in the tank.

  The control unit 10 performs control processing for the entire system, and is configured mainly by a computer including a CPU, a ROM, and a RAM, for example. The earthquake occurrence information acquisition unit 12 is an earthquake information acquisition unit that acquires earthquake occurrence information of an earthquake that has occurred in a remote place in real time, and inputs the earthquake occurrence information to the control unit 10. The earthquake occurrence information is information including at least the epicenter and the magnitude of the earthquake (magnitude), and is preferably input to the control unit 10 before the main motion (P wave) of the earthquake reaches the tank at the latest.

  The control unit 10 functions as a first evaluation unit that calculates a velocity response spectrum based on the earthquake occurrence information, and calculates the crest value of the liquid level due to sloshing for each of the plurality of tanks using the velocity response spectrum. . Also, it functions as a second evaluation unit that calculates a velocity response spectrum based on the detection signal of the seismometer 16 and calculates the crest value of the liquid level due to sloshing for each of the plurality of tanks using the velocity response spectrum.

  As the earthquake occurrence information acquisition unit 12, for example, a unit that acquires real-time earthquake occurrence information through an Internet line or a dedicated line is used. The real-time here means not only simultaneous with the occurrence of the earthquake but also almost simultaneously with the occurrence of the earthquake, for example, including the time within several tens of seconds after the occurrence of the earthquake.

  The liquid level information input unit 14 inputs the liquid level information of the liquid stored in each tank to the control unit 10. The liquid level information input unit 14 may acquire the output of the liquid level detection sensor installed in the tank and input the liquid level information to the control unit 10, or the amount of liquid injected into the tank and The liquid level information calculated from the discharge amount may be input. Further, the liquid level information input unit 14 may input liquid level information to the control unit 10 through an internet line or a dedicated line, or the liquid level height may be input to the control unit 10 by operating a keyboard or a mouse. Information may be input. In addition, when liquid level information is input to the control unit 10 through an Internet line or a dedicated line, a server is prepared, the liquid level information is stored in the server, and the liquid level information is transferred from the server to the control unit 10. Height information may be entered.

  The seismometer 16 is an earthquake detecting means for detecting a vibration caused by an earthquake in the tank, and is provided in a site where the tank is installed. A detection signal detected by the seismometer 16 is input to the control unit 10. The data input unit 18 inputs various information data and setting change information in the sloshing evaluation process to the control unit 10. The monitor 20 is an output unit that displays images, data, and the like related to sloshing evaluation. The speaker 22 is output means for outputting audio information related to sloshing evaluation.

  The communication unit 24 is a communication unit that communicates with the outside of the system, and also functions as a transmission unit that transmits sloshing evaluation information related to the sloshing evaluation to the tank management organization when an earthquake occurs.

  The anti-sloshing unit 26 is anti-sloshing means that is provided in each tank and changes the tank's sloshing cycle so as to keep the crest value in the tank due to sloshing low. A specific structure will be described later.

  The control unit 10, the data input unit 18, the monitor 20, and the speaker 22 can be configured by a personal computer. A personal computer main body may be used as the control unit 10, a keyboard or a mouse may be used as the data input unit 18, and the monitor and speaker 22 attached to the personal computer may be used as they are. In this case, it is necessary for the control unit 10 to read the sloshing evaluation program. For example, a recording medium such as a CD-ROM in which a sloshing evaluation program is recorded may be prepared, the recording medium may be set in a personal computer body, and the sloshing evaluation program may be introduced into the computer system. The sloshing evaluation program may be introduced into the computer system by communication such as the Internet without using a recording medium.

  Next, the sloshing evaluation program and recording medium according to the present embodiment will be described.

  FIG. 2 is a diagram showing the configuration of the recording medium 30 on which the sloshing evaluation program 32 is recorded. The recording medium 30 may be any recording medium that can record a sloshing evaluation program such as a magnetic disk, an optical disk, a CD-ROM, or a memory built in the computer, and can make the sloshing evaluation program readable by the computer. May be.

  The recording medium 30 includes a program area 31 for recording a program and a data area 32 for recording data. The data area 32 stores an earthquake record database 33 that records past earthquake data and the like.

  In the program area 31, a sloshing evaluation program 34 is recorded. The sloshing evaluation program 34 includes a main module 35 that controls processing, a sloshing evaluation module 36 for performing sloshing evaluation based on earthquake information, and an output module 37 that outputs sloshing result information based on the sloshing evaluation result. .

  Next, the operation of the sloshing evaluation system 1 by executing the sloshing evaluation program according to the present embodiment will be described.

  3-9 is explanatory drawing of the monitor display in the sloshing evaluation system 1. FIG. FIG. 10 is a flowchart showing a calculation process of the sloshing period in the sloshing evaluation system 1. FIG. 11 is a flowchart showing a primary evaluation process when an earthquake occurs in the sloshing evaluation system 1. FIG. 12 is a flowchart showing a secondary evaluation process when an earthquake occurs in the sloshing evaluation system 1. Each control routine in FIGS. 10 to 12 is repeatedly executed at predetermined time intervals.

  As shown in FIG. 3, when the sloshing evaluation system 1 is activated, a tank image 40 and various operation buttons 50 are displayed on the monitor 20. The tank image 40 is an image showing a plurality of tanks 41 that are subject to sloshing evaluation. The operation buttons 50 include, for example, an end button 51, a maximum value display button 52, a waveform display button 53, a speed response spectrum display button 54, a sloshing period display button 55, a peak value display button 56, and a past earthquake data selection button 57. The

  By clicking the end button 51, the sloshing evaluation program can be ended. When one past earthquake data is selected by the past earthquake data selection button 57 and the maximum value display button 52 is clicked, the earthquake data 42 in the selected earthquake is displayed as shown in FIG. For example, as the earthquake data 42, the maximum acceleration value in the east-west direction, the north-south direction, and the vertical direction, and the seismic intensity are displayed.

  Further, by clicking the waveform display button 53, the waveform data 43 in the selected earthquake is displayed as shown in FIG. As the waveform data 43, for example, a time change graph of acceleration in the east-west direction, the north-south direction, and the vertical direction is displayed. The vertical axis of this graph is Gal, and the horizontal axis is time.

  Further, by clicking the speed response spectrum display button 54, the speed response spectrum 44 in the selected earthquake is displayed as shown in FIG. As the speed response spectrum data 44, for example, the speed response spectrum in the east-west direction, the north-south direction, and the combined state thereof is displayed. The vertical axis in this speed response spectrum graph is the response speed, and the horizontal axis is the period.

  Further, by clicking the sloshing period display button 55, the sloshing period 45 of each tank 41 in the selected earthquake is displayed as shown in FIG. The sloshing period 45 is preferably displayed on each tank 41. In this case, the sloshing cycle of each tank 41 can be visually grasped at a glance.

  Further, by clicking the peak value display button 56, the peak value 46 of each tank 41 in the selected earthquake is displayed as shown in FIG. Here, the crest value 46 means the amount of rise in the water level from the static liquid level. This peak value 46 is preferably displayed on each tank 41. In this case, the peak value 46 of each tank 41 can be visually grasped at a glance. Further, it is preferable that the peak value 46 exceeding the predetermined value is displayed in a color different from that not exceeding the predetermined value.

  Further, when one of the tanks 41 is clicked, a designation display 47 and tank information 48 for that tank 41 are displayed as shown in FIG. The designation display 47 is a mark shown on the tank 41. For example, a mark with a color is used. The tank information 48 includes inner diameter data of the tank 41, current liquid level height data, and primary natural period data (sloshing period data).

  Next, with reference to FIG. 10, the processing of calculating the sloshing period in the sloshing evaluation system 1 will be described.

  As shown in S10 of FIG. 10, first, the tank liquid level is read. The reading of the tank liquid level is performed based on the liquid level information data input from the liquid level information input unit 14 and is performed for each tank 41.

  And it transfers to S12 and the calculation of a sloshing period is performed. The calculation of the sloshing period is a process of calculating the sloshing period of the liquid stored in the tank 41, and is performed based on the inner diameter and the liquid level of the tank 41. For example, the sloshing period Ts is calculated using the following formula (1).

Ts = 2π · ((D / 3.68 · g) · coth (3.68 · H / D)) ^1/2 (1)
In this equation (1), D is the tank inner diameter, H is the tank liquid level height, and g is the gravitational acceleration. The calculation of the sloshing period is performed for each tank 41.

  According to the sloshing cycle calculation process, the sloshing cycle for each tank 41 can be calculated from the tank inner diameter D and the liquid level height H of the tank 41. In particular, the sloshing period of the tank 41 can be accurately obtained by updating the information on the tank liquid level height H as needed according to the amount of liquid stored in the tank 41.

  The calculation process of the sloshing cycle may be performed at a predetermined time interval or a predetermined number of days, or may be performed at the time of a primary evaluation process or a secondary evaluation process at the time of an earthquake that will be described later.

  Next, with reference to FIG. 11, the primary evaluation process at the time of the occurrence of an earthquake in the sloshing evaluation system 1 will be described.

  As shown in S20 of FIG. 11, it is first determined whether emergency earthquake information has been input. The emergency earthquake information is real-time earthquake occurrence information, and is input to the control unit 10 through the earthquake occurrence information unit 12. When it is determined that emergency earthquake information has not been input, the control process is terminated. On the other hand, when it is determined that emergency earthquake information has been input, a speed response spectrum calculation process is performed (S22).

  The calculation process of the speed response spectrum is a process of predicting and calculating the speed response spectrum of the vibration applied to the tank 41 by the earthquake that has occurred. As the speed response spectrum calculation process, first, a seismic waveform is predicted and calculated based on the epicenter data and the earthquake scale data included in the emergency earthquake information. For example, as shown in the waveform data 43 of FIG. 5, the vibration waveform is predicted as a time change of acceleration due to the vibration. Then, a speed response spectrum is calculated based on the predicted vibration waveform. For example, the velocity response spectrum is calculated by analyzing the vibration waveform with a one-degree-of-freedom vibration system response. The speed response spectrum is calculated as data with the horizontal axis as the period and the vertical axis as the response speed, as shown in the speed response spectrum data 44 of FIG.

  Then, the process proceeds to S24, and a sloshing cycle calculation process is performed. The calculation of the sloshing period is a process of calculating the sloshing period of the liquid stored in the tank 41, and is performed based on the inner diameter and the liquid level of the tank 41. For example, it is performed in the same manner as S12 in FIG. In S24, the sloshing cycle performed in S12 of FIG. 10 may be read and used as it is.

  Then, the process proceeds to S26, and the calculation process of the crest value of the liquid level in the tank 41 is performed. This peak value calculation process is a process of predicting and calculating the maximum peak value of the liquid level of the tank 41 due to earthquake vibration. This peak value is calculated based on the tank inner diameter, the seismic vibration speed response spectrum, and the sloshing period of the tank 41. For example, the crest value X of the liquid level is calculated using the following equation (2).

X = 0.268 · D · Sv · (1 / Ts) (2)
In this equation (2), D is the tank inner diameter, Sv is the velocity response spectrum, and Ts is the sloshing period. The calculation of the peak value is performed for each tank 41.

  Then, the process proceeds to S28, and sloshing information output processing is performed. The sloshing information output processing is processing for transmitting and outputting information related to the crest value due to sloshing to the management organization of the tank 41. As the sloshing information output process, for example, data relating to the crest value is transferred by e-mail. Specifically, all or part of the warning information about the occurrence of the earthquake, maximum peak value information, and overflow tank information is transmitted to the mobile phone of the person in charge of management. In addition, all or a part of the earthquake occurrence warning information, the earthquake scale display information, the maximum peak value information, the speed response spectrum information, and the overflow tank information is transmitted to the PCs of the related organizations.

  Then, the process proceeds to S30, where it is determined whether or not the calculated peak value is greater than a predetermined value. The predetermined value is a setting value set in advance in the control unit 10 and is set in consideration of, for example, whether there is a possibility of overflow in the tank 41. When it is determined that the calculated peak value is not greater than the predetermined value, the control process is terminated.

  On the other hand, when it is determined that the calculated peak value is larger than the predetermined value, the anti-slosh process is performed (S32). The anti-sloshing process is a process of starting the anti-sloshing unit 26 installed in the tank 41 and changing the sloshing cycle of the tank 41 so that the peak value becomes low. This anti-sloshing process is desirably performed only for the tank 41 that has been determined in S30 that the peak value exceeds the predetermined value. By this sloshing prevention processing, the sloshing cycle of the tank 41 is changed, and the crest value due to sloshing is kept low.

  As described above, by performing the primary evaluation processing related to sloshing based on the real-time earthquake occurrence information, the state of the crest value of the liquid level of the tank 41 can be quickly known, and a prompt response to sloshing is possible. In particular, when performing primary evaluation processing for earthquakes that occurred in remote areas 100 to 300 km away, know the peak value of the tank 41 and the presence or absence of overflow before the main motion (P wave) of the earthquake reaches the tank 41. Therefore, it is possible to appropriately cope with sloshing such as evacuation of workers in the tank 41 or preparation of a digestion system.

  Next, with reference to FIG. 12, the secondary evaluation process at the time of the occurrence of an earthquake in the sloshing evaluation system 1 will be described.

  As shown in S40 of FIG. 12, first, an earthquake waveform is read. The reading of the seismic waveform is performed based on the detection signal of the seismometer 16. And it transfers to S42 and it is judged whether an earthquake waveform value is more than a predetermined acceleration value. When it is determined that the seismic waveform value is not equal to or greater than the predetermined acceleration value, the control process is terminated.

  On the other hand, when it is determined that the seismic waveform value is equal to or greater than the predetermined acceleration value, a speed response spectrum calculation process is performed (S44). The calculation process of the speed response spectrum is a process of calculating the speed response spectrum of the vibration applied to the tank 41 by the generated earthquake. For example, the velocity response spectrum is calculated by analyzing the vibration waveform with a one-degree-of-freedom vibration system response. The speed response spectrum is calculated as data with the horizontal axis as the period and the vertical axis as the response speed, as shown in the speed response spectrum data 44 of FIG.

  Then, the process proceeds to S46, and a sloshing cycle calculation process is performed. The calculation of the sloshing period is a process of calculating the sloshing period of the liquid stored in the tank 41, and is performed based on the inner diameter and the liquid level of the tank 41. For example, it is performed in the same manner as S12 in FIG. In S24, the sloshing cycle performed in S12 of FIG. 10 may be read and used as it is.

  Then, the process proceeds to S48, and the calculation process of the crest value of the liquid level in the tank 41 is performed. This peak value calculation process is a process of predicting and calculating the maximum peak value of the liquid level of the tank 41 due to earthquake vibration. This peak value calculation process is performed in the same manner as S26 in FIG.

  Then, the process proceeds to S50 to determine whether or not the sloshing information needs to be changed. For example, it is determined that the sloshing information needs to be changed when the peak value calculated in S48 differs by a predetermined value or more from the peak value calculated in S26 in FIG. 11, and is calculated in S48. When the peak value does not differ from the peak value of the primary evaluation calculated in S26 of FIG. 11 by a predetermined value or more, it is determined that it is not necessary to change the sloshing information. When it is determined in S50 that the sloshing information does not need to be changed, the control process is terminated.

  On the other hand, when it is determined that the sloshing information needs to be changed, sloshing information output processing is performed (S52). This sloshing information output process is a process of correcting the information related to the peak value due to the sloshing in the primary evaluation and transmitting the information related to the peak value due to the sloshing in the secondary evaluation to the management organization of the tank 41. As the sloshing information output process, for example, data relating to the crest value is transferred by e-mail. Specifically, all or part of the warning information about the occurrence of the earthquake, maximum peak value information, and overflow tank information is transmitted to the mobile phone of the person in charge of management. In addition, all or a part of the earthquake occurrence warning information, the earthquake scale display information, the maximum peak value information, the speed response spectrum information, and the overflow tank information is transmitted to the PCs of the related organizations.

  At this time, it is preferable to rank the tanks with a high risk of overflow and transmit information on the overflow tank. In this case, it is effective in preparing disaster countermeasures such as a digestion system.

  Then, the process proceeds to S54, where it is determined whether or not the calculated peak value is greater than a predetermined value. The predetermined value is a setting value set in advance in the control unit 10 and is set in consideration of, for example, whether there is a possibility of overflow in the tank 41. Specifically, a value corresponding to the distance from the stationary liquid surface to the ceiling surface of the tank 41 is set as the predetermined value. When it is determined that the calculated peak value is not greater than the predetermined value, the control process is terminated.

  On the other hand, when it is determined that the calculated peak value is larger than the predetermined value, the anti-sloshing process is performed (S56). The anti-sloshing process is a process of starting the anti-sloshing unit 26 installed in the tank 41 and changing the sloshing cycle of the tank 41 so that the peak value becomes low. This anti-sloshing process is desirably performed only for the tank 41 that has been determined in S30 that the peak value exceeds the predetermined value. By this sloshing prevention processing, the sloshing cycle of the tank 41 is changed, and the crest value due to sloshing is kept low.

  Here, an example of the anti-sloshing unit 26 is shown. As shown in FIG. 13, for example, the sloshing prevention unit 26 that changes the sloshing cycle by changing the inner diameter of the tank 41 is used. The sloshing prevention portion 26 is configured by attaching a sheet material 26b to a pipe 26a that is rotatably attached to a lower portion. Before the occurrence of the earthquake, the pipe 26a is in an upright state along the inner wall, and the sheet material 26b is in a folded state. At this time, the pipe 26a is supported by the release part 26c provided in the upper part, and is maintained in the state which does not fall down.

  When it is determined that the earthquake has occurred and the peak value exceeds a predetermined value, the release portion 26c releases the pipe 26a, and the pipe 26a falls down toward the bottom of the tank. Thereby, the sheet material 26b is developed in a fan shape. Due to the development of the sheet material 26b, the inside of the tank 41 is partitioned and the tank inner diameter is changed. Therefore, the sloshing period changes, sloshing due to earthquake vibration is reduced, and the crest value of the liquid surface 41a is kept low.

  The sloshing prevention unit 26 is not limited to the type as shown in FIG. 13 and may be any type as long as the sloshing cycle of the tank 41 can be changed.

  As described above, by performing the secondary evaluation process related to sloshing based on the actual seismic waveform, the state of the crest value of the liquid level of the tank 41 can be known more accurately. For this reason, it is possible to correct the estimation deviation of the peak value due to the primary evaluation and appropriately cope with the sloshing.

  As described above, according to the sloshing evaluation system, the sloshing evaluation program, and the recording medium according to the present embodiment, the speed response spectrum is calculated based on the real-time earthquake occurrence information, and the tank 41 is stored using the speed response spectrum. The sloshing primary evaluation is performed by calculating the crest value of the liquid level. For this reason, sloshing evaluation can be performed before an earthquake wave reaches the tank 41, and measures against sloshing can be started in advance.

  In addition, since evaluation regarding sloshing is simultaneously performed on a plurality of tanks 41, the state of the tanks can be collectively managed, such as when a large number of tanks 41 are installed like an oil tank base, and management work can be performed efficiently.

  Further, the crest value in the tank 41 due to sloshing can be calculated without installing a seismometer for each of the plurality of tanks 41, and an evaluation system can be constructed at a low cost.

  In addition to primary evaluation of sloshing based on real-time earthquake occurrence information, it is possible to correct the primary evaluation by detecting the actual vibration and performing secondary evaluation, and appropriate sloshing can be handled. .

  Also, the crest value of the tank 41 is calculated based on real-time earthquake occurrence information to perform sloshing evaluation, and when the crest value exceeds a predetermined value, the sloshing prevention unit 26 is activated to lower the crest value. Thus, the sloshing cycle of the tank 41 can be changed. For this reason, the sloshing period can be changed in advance before the seismic wave reaches the tank 41 to prevent the liquid level due to the sloshing from increasing.

  Further, when it is evaluated that the peak value of the tank 41 exceeds a predetermined value at the time of the earthquake occurrence, the management engine side transmits the tank peak value information and overflow tank information to the management organization, so that the management organization side takes measures against tank sloshing. The order to be taken can be easily determined, and countermeasures against sloshing can be efficiently and effectively executed in an emergency. For example, by transmitting the peak value information of the tank 41 and transmitting the overflow tank information, it becomes easy to determine which tank 41 should be prioritized. In addition, a safe evacuation route for the worker of the tank 41 can be easily determined.

1 is a schematic configuration diagram of a sloshing evaluation system according to an embodiment of the present invention. 1 is a schematic configuration diagram of a recording medium on which a sloshing evaluation program according to an embodiment of the present invention is recorded. It is explanatory drawing of the monitor display in the sloshing evaluation system of FIG. It is explanatory drawing of the monitor display in the sloshing evaluation system of FIG. It is explanatory drawing of the monitor display in the sloshing evaluation system of FIG. It is explanatory drawing of the monitor display in the sloshing evaluation system of FIG. It is explanatory drawing of the monitor display in the sloshing evaluation system of FIG. It is explanatory drawing of the monitor display in the sloshing evaluation system of FIG. It is explanatory drawing of the monitor display in the sloshing evaluation system of FIG. It is a flowchart of the sloshing period calculation process in the sloshing evaluation system of FIG. It is a flowchart of the sloshing primary evaluation process in the sloshing evaluation system of FIG. It is a flowchart of the sloshing secondary evaluation process in the sloshing evaluation system of FIG. FIG. 2 is a schematic explanatory diagram of a sloshing prevention unit in the sloshing evaluation system of FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Sloshing evaluation system 10 ... Control part 12 ... Earthquake occurrence information acquisition part 14 ... Liquid height information input part 16 ... Seismometer 18 ... Data input part 20 ... Monitor 22 ... Speaker 24 ... Communication part 26 ... Sloshing prevention part 41 ... Tank

Claims (7)

A sloshing evaluation system for evaluating sloshing due to an earthquake for a plurality of tanks containing liquids,
An earthquake information acquisition means for acquiring earthquake occurrence information of an earthquake that occurred in a remote area in real time;
An earthquake detection means for detecting vibration caused by an earthquake in the tank;
A first evaluation means for calculating a velocity response spectrum based on the earthquake occurrence information, and calculating a crest value of the liquid level due to sloshing for each of the plurality of tanks using the velocity response spectrum;
A second evaluation unit that calculates a velocity response spectrum based on a detection signal of the earthquake detection unit, and calculates a crest value of a liquid level due to sloshing for each of the plurality of tanks using the velocity response spectrum;
When information related to the peak value calculated by the first evaluation means is transmitted to the management organization of the tank, and the peak value calculated by the second evaluation means is different from the peak value calculated by the first evaluation means Transmitting means for correcting the information related to the peak value based on the peak value calculated by the second evaluation means and transmitting the information to the tank management organization;
Sloshing evaluation system with   Sloshing prevention means provided in the tank and activated when the peak value exceeds a predetermined value by the first evaluation means, and is configured to change the tank sloshing cycle so that the peak value becomes low. The sloshing evaluation system according to claim 1 characterized by things.   The sloshing evaluation system according to claim 1 or 2, wherein the transmission means transmits at least tank peak value information and overflow tank information as information on the peak value. A sloshing evaluation program for causing a computer to execute sloshing evaluation processing due to an earthquake in a plurality of tanks,
A first evaluation process for calculating a velocity response spectrum based on real-time earthquake occurrence information in an earthquake that occurred in a remote area, and calculating a crest value of the liquid level due to sloshing for each of the plurality of tanks using the velocity response spectrum; ,
A second evaluation for calculating a velocity response spectrum based on a detection signal of a seismometer installed in the site of the tank, and calculating a crest value of the liquid level due to sloshing for each of the plurality of tanks using the velocity response spectrum Processing,
When information on the peak value calculated by the first evaluation process is transmitted to the tank management organization, and the peak value calculated by the second evaluation process is different from the peak value calculated by the first evaluation process A transmission process for correcting the information related to the peak value based on the peak value calculated by the second evaluation process and transmitting the information to the management organization of the tank;
Is executed by the computer.   When the first evaluation process evaluates that the peak value exceeds the predetermined value, an anti-sloshing process for reducing sloshing by transmitting an activation signal to the anti-sloshing means for changing the sloshing cycle of the tank. The sloshing evaluation program according to claim 4, wherein the sloshing evaluation program is executed by the computer.   The sloshing evaluation program according to claim 5 or 6, wherein the transmission processing transmits at least tank peak value information and overflow tank information as information relating to the peak value.   A computer-readable recording medium on which the sloshing evaluation program according to claim 4 is recorded.

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