A method and system for identifying and controlling the fire risk of a cruise ship

Abstract

The present invention discloses a method and system for identifying and controlling the fire risk of a cruise ship. The method includes: determining the severity of the cruise ship according to the actual parameters of large compartments of the cruise ship; collecting the probability of a fire occurring in large living quarters of the cruise ship; determining the fire extinguishing index of the cruise ship according to the fire-fighting equipment parameters of large compartments of the cruise ship; calculating a comprehensive characterization index by combining the severity of the cruise ship, the fire probability of the cruise ship and the fire extinguishing index of the cruise ship; and identifying the fire occurrence risk of the cruise ship through the top event of the fault tree based on the comprehensive characterization index. The system includes: a shooting module, a fusion module and an evaluation module. By using the present invention, it is possible to effectively overcome the key problems such as the lack of norms to follow and the lack of mature experience to draw on in the design of large compartments of cruise ships that exceed industry standards, thereby greatly improving the ability to identify and control the fire risk of cruise ships. As a method and system for identifying and controlling the fire risk of a cruise ship, the present invention can be widely applied to the technical field related to risk identification.

Description

Technical Field

[0001] The present invention relates to the technical field of risk identification, and particularly to a method and system for identifying and controlling the fire risk of a cruise ship. Background Art

[0002] The current cruise ship design needs to meet two requirements. One is the requirement of the code method, that is, formulating deterministic standards based on accumulated design and practice experience to guide the design and construction of ships, such as oil tankers, bulk carriers, etc.; the other is the requirement of the Safety Level Approach (SLA), that is, using the overall analysis method to conduct risk assessment on the safety standards of existing ships, and determining the acceptable standard of risk through the Formal Safety Assessment (FSA). The current promising design method for large cruise ships is alternative design. The design of large cruise ships has exceeded the applicable scope of the current design code, and it is even more impossible to carry out the design of large cruise ships based on the code method. On the other hand, in the technical categories of the International Maritime Organization (IMO), the part related to risk analysis in ship design is extremely scarce, and there is also a lack of experience in applying risk analysis methods to design practice, which severely restricts the application of SLA in the industry and the implementation of the development and construction of large ship design. Alternative design belongs to the category of SLA, and its core is to use FSA as a tool to conduct risk assessment on the parts not applicable to the design code, and accept the alternative design scheme under the condition that it has the same risk level as the design scheme specified in the code. However, the SLA design code with safety assessment as the core of IMO does not involve the alternative design of large premises, and there are also problems such as unclear definition of concepts and functional requirements and unclear risk assessment methods in the compliance verification for the specifications of life-saving equipment and electromechanical equipment. Summary of the Invention

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide a method and system for identifying and controlling the fire risk of a cruise ship, which can effectively overcome the key problems such as the lack of code to rely on and the lack of mature experience to draw on in the design of large premises of cruise ships that exceed the industry standards, thereby greatly improving the ability to identify and control the fire risk of cruise ships.

[0004] The first technical solution adopted by the present invention is: a method for identifying and controlling the fire risk of a cruise ship, comprising the following steps:

[0005] Determine the severity of the cruise ship according to the actual parameters of the large premises of the cruise ship;

[0006] Collect the probability of a fire occurring in the large accommodation of the cruise ship and conduct amplitude scoring according to the probability;

[0007] Determine the fire extinguishing index of the cruise ship according to the fire fighting equipment parameters of the large premises of the cruise ship;

[0008] Calculate the comprehensive characterization index by combining the severity of the cruise ship, the scoring value of the cruise ship and the fire extinguishing index of the cruise ship;

[0009] Based on the comprehensive characterization index, the fire occurrence risk of the cruise ship is identified through the top event of the fault tree.

[0010] Furthermore, the actual parameters of the large spaces on the cruise ship include the area of combustible materials, the longest escape distance, and the ratio of the maximum occupancy. The step of determining the severity of the cruise ship according to the actual parameters of the large spaces on the cruise ship specifically includes:

[0011] Perform spatial projection processing on the combustible materials in the cruise ship to obtain the area of combustible materials on the cruise ship;

[0012] Calculate the escape routes of the cruise ship through the cruise ship design drawings to obtain the longest escape distance of the cruise ship;

[0013] Calculate the ratio of the maximum occupancy of the cruise ship to the actual area of the cruise ship to obtain the ratio of the maximum occupancy of the cruise ship;

[0014] Normalize the area of combustible materials, the longest escape distance, and the ratio of the maximum occupancy of the cruise ship to obtain the severity of the cruise ship.

[0015] Furthermore, the normalization calculation formula for the actual parameters of the large spaces on the cruise ship is as follows:

[0016]

[0017]

[0018]

[0019] In the above formula, M i represents the total projected area of combustible materials, L i represents the longest escape distance, P i represents the ratio of the maximum occupancy, represents the total projected area of combustible materials after normalization, represents the longest escape distance after normalization, represents the ratio of the maximum occupancy after normalization, i represents the i-th large space on the cruise ship, and n represents the number of large spaces on the cruise ship.

[0020] Furthermore, the calculation formula for the severity of the cruise ship is as follows:

[0021]

[0022] In the above formula, S i represents the severity of the cruise ship.

[0023] Furthermore, the calculation formula for assigning a score according to the probability of a fire occurring on the cruise ship is as follows:

[0024]

[0025]

[0026] In the above formula, O i represents the average score of large areas on the cruise ship, O ij represents the score of the i-th large area on the cruise ship by the j-th expert, and t represents the grade score of the t-th expert. represents the average score of large areas on the cruise ship after normalization.

[0027] Furthermore, the fire-fighting equipment parameters of the large areas on the cruise ship include the number of sprinkler devices, the number of fire extinguishers, and the number of fire hydrants in the large areas on the cruise ship. The step of determining the fire extinguishing index of the cruise ship based on the fire-fighting equipment parameters of the large areas on the cruise ship specifically includes:

[0028] Count the fire-fighting equipment parameters of the large areas on the cruise ship, and calculate the ratio of the fire-fighting equipment parameters of the large areas on the cruise ship to the area of the large areas on the cruise ship;

[0029] Perform normalization processing and weighted summation calculation on the ratio of the fire-fighting equipment parameters of the large areas on the cruise ship to the area of the large areas on the cruise ship in sequence to obtain the fire extinguishing index of the cruise ship.

[0030] Furthermore, the normalization calculation formula of the fire-fighting equipment parameters of the large areas on the cruise ship is as follows:

[0031]

[0032]

[0033]

[0034] In the above formula, Q i represents the ratio of the number of sprinkler devices in the large areas on the cruise ship to the area of the large areas on the cruise ship, E i represents the ratio of the number of fire extinguishers in the large areas on the cruise ship to the area of the large areas on the cruise ship, H i represents the ratio of the number of fire hydrants in the large areas on the cruise ship to the area of the large areas on the cruise ship. represents the ratio of the number of sprinkler devices in the large areas on the cruise ship to the area of the large areas on the cruise ship after normalization. represents the ratio of the number of fire extinguishers in the large areas on the cruise ship to the area of the large areas on the cruise ship after normalization. represents the ratio of the number of fire hydrants in the large areas on the cruise ship to the area of the large areas on the cruise ship after normalization.

[0035] Furthermore, the calculation formula of the fire extinguishing index of the cruise ship is as follows:

[0036]

[0037] In the above formula, D i represents the fire extinguishing index of the cruise ship, ω1 represents the weight of the sprinkler device in the large compartments of the cruise ship, ω2 represents the weight of the fire extinguisher in the large compartments of the cruise ship, and ω3 represents the weight of the fire hydrant in the large compartments of the cruise ship.

[0038] Furthermore, the calculation formula of the comprehensive characterization index of the cruise ship is as follows:

[0039]

[0040] R i = S i + O i + D i , i = 1, 2, …, n

[0041] In the above formula, R i represents the characterization index of the cruise ship, represents the normalized characterization index of the cruise ship.

[0042] The second technical solution adopted by the present invention is: a cruise ship fire risk identification and control system, including:

[0043] A severity calculation module, configured to determine the severity of the cruise ship according to the actual parameters of the large compartments of the cruise ship;

[0044] A scoring module, configured to collect the probability of a fire occurring in the large accommodation of the cruise ship and perform amplitude scoring according to the probability;

[0045] A fire extinguishing index calculation module, configured to determine the fire extinguishing index of the cruise ship according to the fire fighting equipment parameters of the large compartments of the cruise ship;

[0046] A comprehensive characterization index calculation module, configured to calculate a comprehensive characterization index by combining the severity of the cruise ship, the scoring value of the cruise ship, and the fire extinguishing index of the cruise ship;

[0047] An analysis module, based on the comprehensive characterization index, identifies the fire occurrence risk of the cruise ship through the top event of the fault tree.

[0048] The beneficial effects of the method and system of the present invention are: The present invention measures the severity level of the large accommodation of the cruise ship according to the actual parameters of the large compartments of the cruise ship, then quantifies the control ability of the large accommodation of the cruise ship for the occurrence of a fire according to the fire fighting equipment parameters of the large compartments of the cruise ship, and then calculates the fire occurrence risk level of the large accommodation of the cruise ship exceeding the industry standard according to the probability of a fire occurring in the large accommodation of the cruise ship, which can effectively overcome the key problems such as no norms to follow and no mature experience to learn from in the design of large compartments of cruise ships exceeding the industry standard, thereby greatly improving the fire risk identification and control ability of the cruise ship. Description of the Drawings

[0049] Figure 1 is the step flowchart of a method for identifying and controlling the fire risk of a cruise ship according to the present invention;

[0050] Figure 2 is the structural block diagram of a system for identifying and controlling the fire risk of a cruise ship according to the present invention;

[0051] Figure 3 is the schematic diagram of the accident tree result of an implementation example for identifying and controlling the fire risk of a cruise ship according to the present invention. Detailed Implementation Manner

[0052] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments. For the step numbers in the following embodiments, they are only set for the convenience of explanation and illustration, and no limitation is imposed on the order between the steps. The execution order of each step in the embodiments can be adaptively adjusted according to the understanding of those skilled in the art.

[0053] Referring to Figure 1 , the present invention provides a method for identifying and controlling the fire risk of a cruise ship, and the method includes the following steps:

[0054] S1. Determine the severity of the cruise ship according to the actual parameters of the large spaces on the cruise ship;

[0055] Specifically, project the combustible items or materials in the large spaces on the cruise ship to the surrounding space, and count the total projected area M i of the combustible materials, and perform normalization processing as follows:

[0056]

[0057] In the above formula, M i represents the total projected area of the combustible materials, represents the total projected area of the normalized combustible materials, i represents the i-th large space on the cruise ship, and n represents the number of large spaces on the cruise ship;

[0058] Calculate the longest escape distance L i in the large spaces on the cruise ship according to the design drawings, and perform normalization processing as follows:

[0059]

[0060] In the above formula, L i represents the longest escape distance, represents the normalized longest escape distance;

[0061] Determine the ratio P i of the maximum occupancy to the area of each large space on the cruise ship, and perform normalization processing as follows:

[0062]

[0063] In the above formula, P i represents the ratio of the maximum occupancy, and represents the ratio of the maximum occupancy after normalization;

[0064] The formula for calculating the severity level of a fire in a large area of a cruise ship from combustible materials, evacuation distance, and maximum occupancy is as follows:

[0065]

[0066] In the above formula, S i represents the severity of the cruise ship;

[0067] In the embodiments of the present invention, the combustible materials, evacuation distance, ratio of maximum occupancy to area, and their corresponding severity results of large areas of cruise ships exceeding industry standards are shown in Table 1:

[0068] Table 1 Severity of Large Areas of Cruise Ships

[0069]

[0070]

[0071] S2. Collect the probability of a fire occurring in a large accommodation area of a cruise ship and perform amplitude scoring based on the probability;

[0072] Specifically, collect the number of times of fires occurring in the accommodation area, and score according to the quantitative scoring standard for the probability of a fire occurring in a large area of a cruise ship; if there is no fire data information, select an expert group to score according to the qualitative scoring standard. The specific calculation process is as follows: Select t experts to score according to the 1-10 rating scale. Assume that the score of the j-th expert for the i-th large area of a cruise ship is O ij , then the average score of the i-th large area of a cruise ship is as follows:

[0073]

[0074] In the above formula, O i represents the average score of the large area of a cruise ship, and O ij represents the score of the j-th expert for the i-th large area of a cruise ship, and t represents the rating score of the t-th expert;

[0075] Perform normalization processing on it to obtain:

[0076]

[0077] In the above formula, represents the average score of the large area of a cruise ship after normalization;

[0078] In the embodiment of the present invention, the qualitative and quantitative scoring criteria for the probability of a large-scale fire on a cruise ship are defined as shown in Table 2:

[0079] Table 2 Scoring Criteria for the Probability of a Large-Scale Fire on a Cruise Ship

[0080] Scoring level Qualitative scoring criteria Quantitative scoring criteria 1 Rarely occur The probability of a fire occurring in a certain location is less than 0.1% of the total fire probability of the cruise ship 2、3 Seldom occur The probability of a fire occurring in a certain location is greater than 0.1% and less than 1% of the total fire probability of the cruise ship 4、5、6 Occasionally occur The probability of a fire occurring in a certain location is greater than 1% and less than 10% of the total fire probability of the cruise ship 7、8 Sometimes occur The probability of a fire occurring in a certain location is greater than 10% and less than 20% of the total fire probability of the cruise ship 9、10 Frequently occur The probability of a fire occurring in a certain location is greater than 20% of the total fire probability of the cruise ship

[0081] Select 5 experts to score according to the qualitative scoring criteria for the probability of a fire, and calculate according to the above calculation formula. The scoring results are shown in Table 3:

[0082] Table 3 Scoring Results for the Probability of a Large-Scale Fire on a Cruise Ship

[0083]

[0084]

[0085] S3. Determine the fire extinguishing index of the cruise ship according to the fire-fighting equipment parameters of the large-scale areas on the cruise ship;

[0086] Specifically, count the number of sprinkler devices in the large-scale areas on the cruise ship, and calculate the ratio Q of it to the area of the area i , and perform normalization processing. The formula is as follows:

[0087]

[0088] In the above formula, Q i represents the ratio of the number of sprinkler devices in the large-scale areas on the cruise ship to the area of the large-scale areas on the cruise ship, represents the ratio of the number of sprinkler devices in the large-scale areas on the cruise ship to the area of the large-scale areas on the cruise ship after normalization;

[0089] Calculate the ratio E of the number of fire extinguishers in the large-scale areas on the cruise ship to the area of the area i , and perform normalization processing. The formula is as follows:

[0090]

[0091] In the above formula, E i represents the ratio of the number of fire extinguishers in the large-scale areas on the cruise ship to the area of the large-scale areas on the cruise ship, represents the ratio of the number of fire extinguishers in the large-scale areas on the cruise ship to the area of the large-scale areas on the cruise ship after normalization;

[0092] Determine the ratio H of the number of fire hydrants in the large-scale areas on the cruise ship to the area of the area i , and perform normalization processing. The calculation formula is as follows:

[0093]

[0094] In the above formula, H i represents the ratio of the number of fire hydrants in large compartments of the cruise ship to the area of large compartments of the cruise ship, represents the ratio of the number of fire hydrants in large compartments of the cruise ship to the area of large compartments of the cruise ship after normalization;

[0095] The control level of a fire in a large compartment is evaluated by the number of sprinkler devices, fire extinguishers and fire hydrants, and its calculation formula is as follows:

[0096]

[0097] In the above formula, D i represents the fire extinguishing index of the cruise ship, ω1 represents the weight of the sprinkler device in large compartments of the cruise ship, ω2 represents the weight of the fire extinguisher in large compartments of the cruise ship, and ω3 represents the weight of the fire hydrant in large compartments of the cruise ship;

[0098] And there is

[0099] In the embodiments of the present invention, the area of each compartment of the cruise ship, the number of sprinkler devices, fire extinguishers and fire hydrants, and their fire control levels are shown in Table 4:

[0100] Table 4 Fire control level of large compartments of cruise ships

[0101]

[0102]

[0103] Among them, the fire control level weights of the sprinkler device, fire extinguisher and fire hydrant are 0.3, 0.2 and 0.5 respectively;

[0104] S4. Combine the severity of the cruise ship, the scoring value of the cruise ship and the fire extinguishing index of the cruise ship to calculate the comprehensive characterization index;

[0105] Specifically, the calculation formula of the comprehensive characterization index for the fire risk assessment of large compartments of the cruise ship is:

[0106] R i = S i × O i × D i , i = 1, 2,..., n

[0107] In the above formula, R i represents the characterization index of the cruise ship;

[0108] Perform normalization processing on the comprehensive characterization index for the fire risk assessment of large compartments of the cruise ship, and its normalization formula is as follows:

[0109]

[0110] In the above formula, Indicates the normalized cruise ship characterization index;

[0111] In the embodiments of the present invention, the calculation results of the comprehensive characterization index for the fire risk assessment of large areas on cruise ships are shown in Table 5:

[0112] Table 5 Comprehensive Characterization Index for Fire Risk Assessment of Large Areas on Cruise Ships

[0113]

[0114]

[0115] Among them, it can be obtained from Table 5 that the comprehensive risk characterization indices of the restaurant, beer garden, second-floor rest area (DK4 MVZ2), aft restaurant, and theater (DK4\5MVZ6) are the largest;

[0116] S5. Based on the comprehensive characterization index, identify the fire occurrence risk of the cruise ship through the top event of the fault tree.

[0117] Specifically, referring to Figure 3 , conduct a fault tree analysis with the fire in large areas of high-risk cruise ships as the top event of the fault tree, and propose targeted fire accident prevention countermeasures based on the bottom events of the fault tree. In the embodiments of the present invention, select the fire in the cruise ship restaurant as the top event of the fault tree to conduct a fault tree analysis. The results are as Figure 3 shown. It can be seen from the bottom events of the fault tree that the ignition of electrical equipment and combustibles is the main factor causing restaurant fires. Therefore, in the design and maintenance of cruise ship restaurants, key attention should be paid to the laying, installation, and inspection of electrical circuits and electrical equipment, and combustible and flammable materials should be kept away from high-temperature parts.

[0118] Referring to Figure 2 , a cruise ship fire risk identification and control system includes:

[0119] A severity calculation module for determining the severity of the cruise ship based on the actual parameters of large areas on the cruise ship;

[0120] A scoring module for collecting the probability of a fire occurring in large living quarters on the cruise ship and performing amplitude scoring based on the probability;

[0121] An extinguishing index calculation module for determining the extinguishing index of the cruise ship based on the fire-fighting equipment parameters of large areas on the cruise ship;

[0122] A comprehensive characterization index calculation module for calculating the comprehensive characterization index by combining the severity of the cruise ship, the scoring value of the cruise ship, and the extinguishing index of the cruise ship;

[0123] An analysis module for identifying the fire occurrence risk of the cruise ship through the top event of the fault tree based on the comprehensive characterization index.

[0124] The content in the method embodiments described above is applicable to the system embodiments herein. The functions specifically implemented in the system embodiments are the same as those in the method embodiments, and the beneficial effects achieved are also the same as those in the method embodiments.

[0125] The above is a specific description of the preferred embodiments of the present invention. However, the present invention is not limited to the described embodiments. Those skilled in the art can make various equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A method for identifying and controlling the fire risk of a cruise ship, characterized in that, Including the following steps: Determine the severity of the cruise ship according to the actual parameters of large areas on the cruise ship; Collect the probability of fire occurring in large accommodation areas on the cruise ship and assign scores according to the probability; Determine the fire extinguishing index of the cruise ship according to the fire fighting equipment parameters of large areas on the cruise ship; Calculate the comprehensive characterization index by combining the severity of the cruise ship, the score value of the cruise ship and the fire extinguishing index of the cruise ship; Based on the comprehensive characterization index, identify the fire occurrence risk of the cruise ship through the top event of the fault tree; The actual parameters of the large areas on the cruise ship include the area of combustible materials, the longest escape distance and the ratio of the maximum occupancy. The step of determining the severity of the cruise ship according to the actual parameters of the large areas on the cruise ship specifically includes: Perform spatial projection processing on the combustible materials in the cruise ship to obtain the area of combustible materials on the cruise ship; Calculate the escape route of the cruise ship through the cruise ship design drawing to obtain the longest escape distance of the cruise ship; Calculate the ratio of the maximum occupancy of the cruise ship to the actual area of the cruise ship to obtain the ratio of the maximum occupancy of the cruise ship; Perform normalization processing on the area of combustible materials, the longest escape distance and the ratio of the maximum occupancy of the cruise ship to obtain the severity of the cruise ship; The normalization calculation formula of the actual parameters of the large areas on the cruise ship is as follows: In the above formula, M i represents the total projected area of combustible materials, L i represents the longest escape distance, P i represents the ratio of the maximum occupancy, represents the total projected area of the combustible materials after normalization, represents the longest escape distance after normalization, represents the ratio of the maximum occupancy after normalization, i represents the large compartment of the i-th cruise ship, and n represents the number of large compartments of the cruise ship; The calculation formula of the severity of the cruise ship is as follows: In the above formula, S i represents the severity of the cruise ship; The calculation formula of the comprehensive characterization index of the cruise ship is as follows: R i = S i + O i + D i , i = 1, 2, …, n In the above formula, R i represents the characterization index of the cruise ship, represents the normalized characterization index of the cruise ship, O i represents the assigned score of the large spaces of the cruise ship, D i represents the fire extinguishing index of the cruise ship.

2. The method for identifying and controlling the fire risk of a cruise ship according to claim 1, characterized in that, The calculation formula for assigning scores according to the probability is as follows: In the above formula, O i represents the assigned score of the large area of the cruise ship, O ij represents the score given by the j-th expert to the i-th large area of the cruise ship, and t represents the grade score of the t-th expert. represents the assigned score of the large area of the cruise ship after normalization.

3. The method for identifying and controlling the fire risk of a cruise ship according to claim 1, characterized in that, The fire fighting equipment parameters of the large areas on the cruise ship include the number of sprinkler devices, the number of fire extinguishers and the number of fire hydrants in the large areas on the cruise ship. The step of determining the fire extinguishing index of the cruise ship according to the fire fighting equipment parameters of the large areas on the cruise ship specifically includes: Statistical fire fighting equipment parameters of large areas on the cruise ship, and calculate the ratio of the fire fighting equipment parameters of large areas on the cruise ship to the area of large areas on the cruise ship; Perform normalization processing and weighted sum calculation on the ratio of the fire fighting equipment parameters of the large areas on the cruise ship to the area of the large areas on the cruise ship in sequence to obtain the fire extinguishing index of the cruise ship.

4. The method for identifying and controlling the fire risk of a cruise ship according to claim 3, wherein, The normalization calculation formula of the fire fighting equipment parameters of the large areas on the cruise ship is as follows: In the above formula, Q i represents the ratio of the number of sprinkler devices in the large compartments of the cruise ship to the area of the large compartments of the cruise ship, and E i represents the ratio of the number of fire extinguishers in the large compartments of the cruise ship to the area of the large compartments of the cruise ship, and H i represents the ratio of the number of fire hydrants in the large compartments of the cruise ship to the area of the large compartments of the cruise ship, represents the ratio of the number of sprinkler devices in the large compartments of the cruise ship after normalization to the area of the large compartments of the cruise ship, represents the ratio of the number of fire extinguishers in the large compartments of the cruise ship after normalization to the area of the large compartments of the cruise ship, represents the ratio of the number of fire hydrants in the large compartments of the cruise ship after normalization to the area of the large compartments of the cruise ship.

5. The method for identifying and controlling the fire risk of a cruise ship according to claim 4, wherein The calculation formula of the fire extinguishing index of the cruise ship is as follows: In the above formula, D i represents the fire extinguishing index of the cruise ship, ω1 represents the weight of the sprinkler device in the large compartments of the cruise ship, ω2 represents the weight of the fire extinguisher in the large compartments of the cruise ship, and ω3 represents the weight of the fire hydrant in the large compartments of the cruise ship.

6. A cruise ship fire risk identification and control system, characterized in that A method for identifying and controlling the fire risk of a cruise ship as claimed in claim 1, comprising the following modules: A severity calculation module for determining the severity of the cruise ship according to the actual parameters of large areas on the cruise ship; A scoring module for collecting the probability of fire occurring in large accommodation areas on the cruise ship and assigning scores according to the probability; A fire extinguishing index calculation module for determining the fire extinguishing index of the cruise ship according to the fire fighting equipment parameters of large areas on the cruise ship; A comprehensive characterization index calculation module for calculating the comprehensive characterization index by combining the severity of the cruise ship, the score value of the cruise ship and the fire extinguishing index of the cruise ship; An analysis module for identifying the fire occurrence risk of the cruise ship through the top event of the fault tree based on the comprehensive characterization index.

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