A method and system for detecting fatigue of gas cylinder

Abstract

The present invention relates to the field of fatigue detection technology, and discloses a method and system for detecting fatigue of a gas cylinder, wherein the method comprises: obtaining basic characteristic data of liquefied petroleum gas cylinder materials, and determining a standard life based on these data; considering the historical use conditions of the gas cylinder, adjusting the standard life to obtain an estimated life; analyzing the working data of the gas cylinder during operation, and calculating the fatigue strength; and calculating the fatigue life and evaluating the use risk based on the fatigue strength and the estimated life. The method and system for detecting fatigue of a gas cylinder disclosed in the present invention can effectively improve the safety of the gas cylinder, extend the service life, realize timely maintenance and management, and evaluate and control the risks of the gas cylinder, thereby ensuring the safety and stability during the transportation of liquefied petroleum gas.

Description

Technical Field

[0001] The present invention relates to the technical field of fatigue detection, and in particular to a method and system for detecting fatigue of a gas cylinder. Background Art

[0002] Cylinders for transporting liquefied petroleum gas (LPG) are specially designed and manufactured high-pressure containers with specific materials, design pressures, valves and safety devices to ensure the safe storage and transportation of LPG.

[0003] LPG cylinders are subjected to high pressure and constantly changing loads during transportation, and long-term use can easily lead to fatigue damage. Regular fatigue testing can help to promptly identify fatigue damage inside the cylinders and take repair or replacement measures, thereby extending the service life of the cylinders and reducing the cost of scrapping and replacing cylinders due to fatigue damage. In addition, fatigue testing can promptly identify potential safety hazards and reduce the risk of accidents.

[0004] Therefore, inventing a new method and system for detecting fatigue of gas cylinders is an important measure to ensure the safety of liquefied petroleum gas transportation. Summary of the invention

[0005] In view of this, the present invention proposes a gas cylinder fatigue detection method, comprising:

[0006] Obtaining basic characteristic data of materials used in gas cylinders for transporting liquefied petroleum gas, and obtaining a standard life of the gas cylinder based on the basic characteristic data;

[0007] Obtain historical usage condition data of gas cylinders, adjust the standard life of gas cylinders according to the historical usage condition data, and obtain an estimated life;

[0008] Obtain the working data of the gas cylinder during operation, and calculate the fatigue strength of the gas cylinder based on the working data;

[0009] The fatigue life of the gas cylinder is calculated based on the fatigue strength and the estimated life, and the risk of using the gas cylinder is evaluated based on the fatigue life.

[0010] Preferably, when obtaining basic characteristic data of materials used in gas cylinders for transporting liquefied petroleum gas and obtaining the standard life of the gas cylinders based on the basic characteristic data, the method includes:

[0011] The basic characteristic data include the material type, wall thickness and inner diameter of the gas cylinder;

[0012] The standard life of the gas cylinder is calculated based on the material type, wall thickness and inner diameter of the gas cylinder. The calculation formula is:

[0013]

[0014] Among them, L0 is the standard life, K is the material constant of the gas cylinder, T is the material thickness of the gas cylinder, and R is the inner diameter of the gas cylinder.

[0015] Preferably, the material constant K of the gas cylinder is calculated by the following calculation formula:

[0016]

[0017] Among them, θ is the tensile strength of the material and π is the circumference of a circle.

[0018] Preferably, when obtaining historical usage condition data of the gas cylinder and adjusting the standard life of the gas cylinder according to the historical usage condition data to obtain the estimated life, the method includes:

[0019] The historical usage condition data includes environmental conditions, usage frequency and working cycle; according to the environmental conditions, usage frequency and working cycle, the environmental condition adjustment factor f1, the usage frequency adjustment factor f2 and the working cycle adjustment factor f3 are obtained respectively;

[0020] The standard life of the gas cylinder is adjusted according to the environmental condition adjustment factor f1, the frequency of use adjustment factor f2 and the working cycle adjustment factor f3 to obtain the estimated life. The calculation formula is:

[0021] L1=L0·f1·f2·f3;

[0022] Wherein, L1 is the estimated lifespan, 0<f1<1, 0<f2<1, 0<f3<1.

[0023] Preferably, after obtaining the historical usage condition data of the gas cylinder, adjusting the standard life of the gas cylinder according to the historical usage condition data, and obtaining the estimated life, the method includes:

[0024] Obtaining the total time that the liquefied petroleum gas is placed in the gas cylinder, and obtaining the corrosion probability of the gas cylinder according to the total time;

[0025] The corrosion probability is calculated based on the composition and adulterants in the liquefied petroleum gas and the total time the liquefied petroleum gas is placed in the gas cylinder. The calculation formula is:

[0026] P=1-e -(m1·t+m2) ;

[0027] Among them, P is the corrosion probability, m1 is the influence factor of LPG composition and dopant, m2 is the influence factor of the total time LPG is placed in the cylinder, t is the total time LPG is placed in the cylinder, and e is a natural constant;

[0028] The estimated life is corrected by the corrosion probability to obtain the final estimated life, and the calculation formula is:

[0029] Lx = L1·(1-P);

[0030] Wherein, Lx is the final estimated lifespan;

[0031] At this time, the fatigue life of the gas cylinder is calculated based on the fatigue strength and the final estimated life, and the risk of using the gas cylinder is evaluated based on the fatigue life.

[0032] Preferably, the working data of the gas cylinder when in operation is obtained, and the fatigue strength of the gas cylinder is calculated according to the working data;

[0033] The working data include the pressure inside the gas cylinder, the temperature of the environment in which the gas cylinder is located, the temperature inside the gas cylinder and the pressure on the outside of the gas cylinder;

[0034] The fatigue strength of the gas cylinder is calculated based on the pressure inside the gas cylinder, the temperature of the environment in which the gas cylinder is located, the temperature inside the gas cylinder and the pressure on the outside of the gas cylinder. The calculation formula is:

[0035] E=r1·p0+r2·ΔQ+r3·p1;

[0036] ΔQ=|Q1-Q2|;

[0037] Among them, E is fatigue strength, p0 is the pressure inside the gas cylinder, Q1 is the temperature of the environment in which the gas cylinder is located, Q2 is the temperature inside the gas cylinder, ΔQ is the absolute value of the difference between the temperature of the environment in which the gas cylinder is located and the temperature inside the gas cylinder, p1 is the pressure on the outside of the gas cylinder, and r1, r2, and r3 are coefficients.

[0038] Preferably, the load conditions to which the gas cylinder is subjected during operation are obtained, and the fatigue strength is corrected according to the load conditions to obtain the final fatigue strength;

[0039] The load conditions of the gas cylinder during operation are expressed by load data. The fatigue load value is obtained by performing frequency domain analysis on the load data and then calculating according to the fatigue load spectrum.

[0040] Wherein, the load data includes load frequency and load amplitude;

[0041] Ex=E·(1+j1·c)·(1+j2·d);

[0042] Among them, Ex is the ultimate fatigue strength, j1 is the load frequency coefficient, c is the load frequency, j2 is the load amplitude coefficient, and d is the load amplitude.

[0043] Preferably, when calculating the fatigue life of the gas cylinder according to the fatigue strength and the estimated life, it includes:

[0044] Based on the fatigue strength and estimated life, the fatigue life of the cylinder is calculated by the following formula:

[0045]

[0046] Among them, Lz is the fatigue life of the gas cylinder, L1 is the estimated life, E is the fatigue strength, g is the fatigue strength related constant, and λ is the fatigue strength related index.

[0047] Preferably, the risk assessment of cylinder use based on fatigue life includes:

[0048] Calculate the ratio of fatigue life to estimated life h, Classifying the risk of using the gas cylinder according to the ratio h;

[0049] A first ratio reference value h1 and a second ratio reference value h2 are preset, and 0

[0050] When h

[0051] When h1≤h<h2, the risk of using the gas cylinder is judged to be medium, and monitoring and maintenance need to be strengthened;

[0052] When h≥h2, the risk of using the gas cylinder is judged to be high, and the use of the gas cylinder should be stopped immediately and replaced.

[0053] The present invention also proposes a gas cylinder fatigue detection system, including a data acquisition module, a data processing module, a fatigue assessment module and an early warning output module; wherein,

[0054] The data acquisition module is used to obtain basic characteristic data of the materials used in the gas cylinder, historical usage condition data of the gas cylinder, and working data of the gas cylinder when it is working;

[0055] The data processing module is used to process and analyze the collected data and calculate the standard life, estimated life and fatigue strength of the gas cylinder;

[0056] The fatigue assessment module is used to assess the fatigue life of the gas cylinder based on the calculated fatigue strength and estimated life;

[0057] The warning output module is used to display the evaluation results and issue warnings.

[0058] Compared with the prior art, the present invention has the following beneficial effects:

[0059] The gas cylinder fatigue detection method and system disclosed in the present invention can effectively improve the safety of gas cylinders, extend their service life, achieve timely maintenance and management, and evaluate and control the risks of gas cylinders, thereby ensuring the safety and stability of liquefied petroleum gas transportation.

[0060] ​​Improved safety: By obtaining the basic characteristic data of the gas cylinder material and combining it with the historical usage condition data, the life of the gas cylinder can be accurately assessed, and the fatigue strength can be calculated based on the working data, thereby effectively identifying potential safety hazards and improving the safety of the gas cylinder.

[0061] Extending the service life of gas cylinders: Adjusting the estimated life of gas cylinders can provide a reasonable estimate of the life of gas cylinders based on actual usage, thereby better planning maintenance and replacement plans, extending the service life of gas cylinders, and improving asset utilization.

[0062] Timely maintenance and management: By monitoring the working data of the gas cylinder and calculating the fatigue strength, the fatigue condition of the gas cylinder can be discovered in time, and targeted maintenance and management can be carried out to reduce sudden failures caused by fatigue damage and ensure the continuity of production and transportation.

[0063] Risk assessment and control: By assessing the risk of using gas cylinders based on the calculated fatigue life, potential risks can be identified in a timely manner, and appropriate measures can be taken to control and prevent them, thereby reducing the possibility of accidents and ensuring the safety of personnel and equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0065] Figure 1 A flow chart of a gas cylinder fatigue detection system method provided by an embodiment of the present invention;

[0066] Figure 2 A structural block diagram of a gas cylinder fatigue detection system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0067] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0068] like Figure 1 As shown, this embodiment provides a method for detecting fatigue of a gas cylinder, including:

[0069] S1. Obtaining basic characteristic data of materials used in gas cylinders for transporting liquefied petroleum gas, and obtaining a standard life of the gas cylinder based on the basic characteristic data;

[0070] S2. Obtain historical usage condition data of the gas cylinder, adjust the standard life of the gas cylinder according to the historical usage condition data, and obtain an estimated life;

[0071] S3, obtaining the working data of the gas cylinder when it is working, and calculating the fatigue strength of the gas cylinder according to the working data;

[0072] S4. Calculate the fatigue life of the gas cylinder according to the fatigue strength and the estimated life, and evaluate the risk of using the gas cylinder according to the fatigue life.

[0073] It is understandable that the cylinder fatigue detection method is an important safety monitoring method aimed at ensuring the safety of liquefied petroleum gas cylinders during use. The method mainly includes the following steps:

[0074] 1. Obtaining basic characteristic data: First, we need to obtain the basic characteristic data of the materials used in gas cylinders for transporting liquefied petroleum gas. These data include the elastic modulus, Poisson's ratio, tensile strength, etc. of the gas cylinder material, which are key factors in evaluating the fatigue performance of the gas cylinder. Based on these basic characteristic data, we can calculate the standard life of the gas cylinder, that is, the longest period of normal use of the gas cylinder under ideal conditions.

[0075] 2. Obtaining historical usage condition data: In actual use, the environment and working conditions of the gas cylinder will affect its life. Therefore, we need to obtain the historical usage condition data of the gas cylinder, such as operating temperature, pressure, vibration, etc. Based on this data, we can adjust the standard life of the gas cylinder to obtain a more realistic estimated life.

[0076] 3. Obtaining working data: In order to more accurately evaluate the fatigue performance of the gas cylinder, we also need to obtain the working data of the gas cylinder during operation. These data include pressure changes, temperature changes, vibration amplitude, etc. in the gas cylinder. Based on these working data, we can calculate the fatigue strength of the gas cylinder, that is, the maximum stress that the gas cylinder withstands within a certain period of time.

[0077] 4. Fatigue life calculation and risk assessment: Finally, we need to calculate the fatigue life of the gas cylinder based on the fatigue strength and estimated life of the gas cylinder. Fatigue life refers to the time period from the beginning of use to the occurrence of fatigue cracks or failure of the gas cylinder during actual use. Based on fatigue life, we can evaluate the risks of gas cylinders in use and provide strong protection for the safe production of gas cylinders.

[0078] In short, this method of cylinder fatigue detection can accurately evaluate the fatigue performance and use risk of cylinders through multi-faceted analysis of the basic characteristic data, historical use condition data, and working data of cylinders. This helps to ensure the safety of LPG cylinders during use, reduce the probability of accidents, and provide support for the development of my country's LPG industry.

[0079] In some embodiments, when obtaining basic characteristic data of materials used in gas cylinders for transporting liquefied petroleum gas and obtaining the standard life of the gas cylinders based on the basic characteristic data, the method includes:

[0080] The basic characteristic data include the material type, wall thickness and inner diameter of the gas cylinder;

[0081] The standard life of the gas cylinder is calculated based on the material type, wall thickness and inner diameter of the gas cylinder. The calculation formula is:

[0082]

[0083] Among them, L0 is the standard life, K is the material constant of the gas cylinder, T is the material thickness of the gas cylinder, and R is the inner diameter of the gas cylinder.

[0084] It is understandable that in this embodiment, in order to ensure the safety performance of the gas cylinder for transporting liquefied petroleum gas during use, we need to obtain the basic characteristic data of the materials used in the gas cylinder. These basic characteristic data include key parameters such as the material type, wall thickness and inner diameter of the gas cylinder. After obtaining these data, we can calculate the standard life of the gas cylinder based on these data, providing a scientific basis for the rational use and management of the gas cylinder.

[0085] The specific calculation process is as follows: First, based on the basic characteristic data such as the material type, wall thickness and inner diameter of the gas cylinder, we can use the corresponding calculation formula to predict the standard life of the gas cylinder. In this way, transportation companies and users can formulate reasonable inspection, maintenance and management plans based on the actual use and expected life of the gas cylinder to ensure the safe use of the gas cylinder.

[0086] In addition, this calculation method can also provide a reference for the design and production of gas cylinders. In terms of material selection and structural design of gas cylinders, the performance of gas cylinders can be optimized and their safety can be improved based on the calculated standard lifespan.

[0087] In short, by obtaining the basic characteristic data of gas cylinders and applying the corresponding calculation methods, we can provide strong support for the life prediction, use management and supervision of gas cylinders. This will help improve the safety performance of liquefied petroleum gas cylinders and protect people's lives and property.

[0088] In some embodiments, the material constant K of the gas cylinder is calculated by the following calculation formula:

[0089]

[0090] Among them, θ is the tensile strength of the material and π is the circumference of a circle.

[0091] In some embodiments, when obtaining historical usage condition data of the gas cylinder and adjusting the standard life of the gas cylinder according to the historical usage condition data to obtain the estimated life, the method includes:

[0092] The historical usage condition data includes environmental conditions, usage frequency and working cycle; according to the environmental conditions, usage frequency and working cycle, the environmental condition adjustment factor f1, the usage frequency adjustment factor f2 and the working cycle adjustment factor f3 are obtained respectively;

[0093] The standard life of the gas cylinder is adjusted according to the environmental condition adjustment factor f1, the frequency of use adjustment factor f2 and the working cycle adjustment factor f3 to obtain the estimated life. The calculation formula is:

[0094] L1=L0·f1·f2·f3;

[0095] Wherein, L1 is the estimated lifespan, 0<f1<1, 0<f2<1, 0<f3<1.

[0096] It is understandable that in this embodiment, when obtaining the historical usage data of the gas cylinder and adjusting the standard life of the gas cylinder to obtain the estimated life, the following factors need to be considered:

[0097] The historical usage data includes environmental conditions, usage frequency and working cycle. Based on these environmental conditions, usage frequency and working cycle, we can calculate the environmental condition adjustment factor f1, the usage frequency adjustment factor f2 and the working cycle adjustment factor f3 respectively.

[0098] Next, based on the environmental condition adjustment factor f1, the usage frequency adjustment factor f2 and the duty cycle adjustment factor f3, we can adjust the standard life of the gas cylinder to obtain the estimated life.

[0099] In this way, we can predict the life of gas cylinders based on the historical usage conditions and adjustment factors of gas cylinders, thus providing a basis for the rational use and management of gas cylinders. In practical applications, this method can help us better understand and control the service life of gas cylinders and ensure that gas cylinders are used within a safe range.

[0100] In summary, by calculating the cylinder material constant K, adjusting the historical usage condition factor and calculating the estimated life, we can more accurately predict the life of the cylinder and provide strong support for the maintenance and management of the cylinder. This method depends largely on the use conditions of the cylinder. Therefore, it is crucial to reasonably set and use the environmental conditions, frequency of use and working cycle of the cylinder to extend the life of the cylinder.

[0101] It should be noted that the environmental condition adjustment factor f1, the frequency of use adjustment factor f2 and the duty cycle adjustment factor f3 can be calculated based on actual conditions. For example:

[0102] Environmental conditions adjustment factor f1:

[0103] Based on experimental data: Conduct experiments to place gas cylinders under different environmental conditions (such as high temperature, high humidity, chemical corrosion environment, etc.), observe their life performance, and compare them with the life under ideal conditions. Determine the adjustment factor based on the observation results.

[0104] Based on statistical analysis: collect historical data, including the life data of gas cylinders under different environmental conditions, use statistical methods (such as regression analysis, variance analysis, etc.) to analyze the impact of environmental conditions on life, and determine adjustment factors based on the analysis results.

[0105] Use frequency adjustment factor f2:

[0106] Based on actual data: Collect the frequency of use data of gas cylinders and count the number of times or frequency of use in each time period. Observe the life performance of gas cylinders according to the frequency of use and calculate the adjustment factor.

[0107] Based on professional knowledge: Based on the engineer or expert's theoretical understanding of the effect of cylinder usage frequency on life, combined with actual application experience, the adjustment factor is estimated.

[0108] Duty cycle adjustment factor f3:

[0109] Based on actual data: Collect the working cycle data of the gas cylinders, and count the usage or running time in each working cycle. Observe the life performance of the gas cylinders according to the length of the working cycle, and calculate the adjustment factor.

[0110] Based on professional knowledge: The adjustment factor is estimated based on the engineer or expert's theoretical understanding of the effect of working cycle on life, combined with practical application experience.

[0111] In some embodiments, after obtaining historical usage condition data of the gas cylinder, adjusting the standard life of the gas cylinder according to the historical usage condition data, and obtaining the estimated life, the method includes:

[0112] Obtaining the total time that the liquefied petroleum gas is placed in the gas cylinder, and obtaining the corrosion probability of the gas cylinder according to the total time;

[0113] The corrosion probability is calculated based on the composition and adulterants in the liquefied petroleum gas and the total time the liquefied petroleum gas is placed in the gas cylinder. The calculation formula is:

[0114] P=1-e -(m1·t+m2) ;

[0115] Among them, P is the corrosion probability, m1 is the influence factor of LPG composition and dopant, m2 is the influence factor of the total time LPG is placed in the cylinder, t is the total time LPG is placed in the cylinder, and e is a natural constant;

[0116] The estimated life is corrected by the corrosion probability to obtain the final estimated life, and the calculation formula is:

[0117] Lx = L1·(1-P);

[0118] Wherein, Lx is the final estimated lifespan;

[0119] At this time, the fatigue life of the gas cylinder is calculated based on the fatigue strength and the final estimated life, and the risk of using the gas cylinder is evaluated based on the fatigue life.

[0120] It is understandable that the purpose of collecting and analyzing the historical usage data of the gas cylinder in this embodiment is to adjust the standard life of the gas cylinder and thus obtain an estimated life. This process mainly includes the following steps:

[0121] First, we need to obtain the total storage time of LPG in the cylinder. This total storage time will help us further calculate the corrosion probability of the cylinder. The composition and adulteration of LPG and its storage time in the cylinder will affect the corrosion condition of the cylinder.

[0122] Next, we calculate the probability of corrosion based on the composition and adulteration of the LPG and the total length of time the LPG has been stored in the cylinder. Once the corrosion probability is calculated, we use it to correct the estimated lifespan to arrive at the final estimated lifespan.

[0123] Finally, based on the final estimated life and fatigue strength, we can evaluate the risk of the cylinder during use. This risk assessment will help us better manage and maintain the cylinder and ensure its safety during use.

[0124] The above embodiment proposes a specific process of how to adjust the standard life of the gas cylinder according to the historical usage data and obtain the estimated life. This process fully considers factors such as the storage time, composition and adulteration of the liquefied petroleum gas in the gas cylinder, as well as the fatigue strength of the gas cylinder, so that we can more accurately assess the use risk of the gas cylinder, thereby ensuring the safe use of the gas cylinder.

[0125] It should be pointed out that in practical applications, the values ​​of m1 and m2 need to be determined according to specific circumstances, which requires the use of experimental data, professional knowledge, statistical analysis and other methods to estimate.

[0126] In some of the embodiments, working data of the gas cylinder when it is working is obtained, and fatigue strength of the gas cylinder is calculated according to the working data;

[0127] The working data include the pressure inside the gas cylinder, the temperature of the environment in which the gas cylinder is located, the temperature inside the gas cylinder and the pressure on the outside of the gas cylinder;

[0128] The fatigue strength of the gas cylinder is calculated based on the pressure inside the gas cylinder, the temperature of the environment in which the gas cylinder is located, the temperature inside the gas cylinder and the pressure on the outside of the gas cylinder. The calculation formula is:

[0129] E=r1·p0+r2·ΔQ+r3·p1;

[0130] ΔQ=|Q1-Q2|;

[0131] Among them, E is fatigue strength, p0 is the pressure inside the gas cylinder, Q1 is the temperature of the environment in which the gas cylinder is located, Q2 is the temperature inside the gas cylinder, ΔQ is the absolute value of the difference between the temperature of the environment in which the gas cylinder is located and the temperature inside the gas cylinder, p1 is the pressure on the outside of the gas cylinder, and r1, r2, and r3 are coefficients.

[0132] It is understandable that in various application scenarios, gas cylinders are key equipment and their working status has attracted much attention. To ensure the safe use of gas cylinders, maintenance personnel need to monitor the working data of gas cylinders in real time and make reasonable analysis of these data. This embodiment provides a method for obtaining the working data of gas cylinders and calculating the fatigue strength of gas cylinders, thereby determining the use status of gas cylinders and providing a basis for the maintenance and management of gas cylinders.

[0133] The data involved in the fatigue strength calculation of gas cylinders mainly include the pressure inside the gas cylinder, the temperature of the environment in which the gas cylinder is located, the temperature inside the gas cylinder, and the pressure on the outside of the gas cylinder. These data can be collected in real time through various sensors to provide basic data for calculating the fatigue strength of the gas cylinder.

[0134] Through the above formula, we can get the fatigue strength of the gas cylinder, and thus evaluate the use of the gas cylinder. When the fatigue strength of the gas cylinder exceeds a certain threshold, the gas cylinder needs to be repaired or replaced to ensure the safe use of the gas cylinder.

[0135] In short, by real-time monitoring of the working data of the gas cylinder and using the calculation method proposed in this paper to analyze the fatigue strength of the gas cylinder, the use status of the gas cylinder can be effectively judged, providing strong support for the maintenance and management of the gas cylinder. In practical applications, the calculation formula needs to be adjusted in combination with the specific use environment and operating conditions of the gas cylinder to improve the accuracy and practicality of the calculation results.

[0136] It should be pointed out that r1, r2, and r3 are coefficients determined according to specific circumstances, reflecting the influence of different factors on fatigue strength.

[0137] In some of the embodiments, the load conditions to which the gas cylinder is subjected during operation are obtained, and the fatigue strength is corrected according to the load conditions to obtain the final fatigue strength;

[0138] The load conditions of the gas cylinder during operation are expressed by load data. The fatigue load value is obtained by performing frequency domain analysis on the load data and then calculating according to the fatigue load spectrum.

[0139] Wherein, the load data includes load frequency and load amplitude;

[0140] Ex=E·(1+j1·c)·(1+j2·d);

[0141] Among them, Ex is the ultimate fatigue strength, j1 is the load frequency coefficient, c is the load frequency, j2 is the load amplitude coefficient, and d is the load amplitude.

[0142] It is understandable that in various engineering applications, gas cylinders are an important pressure vessel, and their safety performance and fatigue strength analysis are crucial. During long-term use, gas cylinders will be subjected to various complex loads, which may cause fatigue damage to the gas cylinders, thereby affecting their service life and safety performance. In order to ensure the safe use of gas cylinders, we need to conduct a comprehensive analysis of the load conditions to which the gas cylinders are subjected during operation, and correct the fatigue strength to obtain a more accurate final fatigue strength.

[0143] The loads that the gas cylinder is subjected to during operation are usually expressed as load data. In order to better understand these data, we can further study the stress distribution of the gas cylinder at different frequencies by performing frequency domain analysis on the load data. Through this analysis, we can obtain two important parameters: load frequency and load amplitude. These two parameters are of key significance for subsequent fatigue strength analysis.

[0144] When correcting fatigue strength, we need to use two parameters: load frequency coefficient j1 and load amplitude coefficient j2 (need to be set according to actual conditions). They correspond to the load frequency and load amplitude respectively, and can be used to describe the stress state of the gas cylinder under different load conditions. Based on these coefficients and load data, we can calculate the stress amplitude of the gas cylinder at each frequency, and then obtain the final fatigue strength Ex.

[0145] In summary, by performing frequency domain analysis on the load data during the working process of the gas cylinder, we can obtain the two key parameters of load frequency and load amplitude. Furthermore, by introducing the load frequency coefficient and load amplitude coefficient, we can correct the fatigue strength of the gas cylinder and obtain a more accurate final fatigue strength. This method provides an important basis for the safe use and performance evaluation of gas cylinders, and helps to improve the technical level of the gas cylinder industry.

[0146] In practical applications, we also need to consider the environment and usage conditions of the gas cylinders, which may affect the fatigue strength of the gas cylinders. Therefore, when conducting fatigue strength analysis, we need to fully consider these factors to obtain more reliable analysis results. In addition, as the gas cylinders are used for a long time, their fatigue strength will gradually decrease, so we need to regularly test and evaluate the gas cylinders to ensure their safety performance during use.

[0147] In short, the fatigue strength analysis of gas cylinders is a complex process involving multiple links. By performing frequency domain analysis on load data and introducing load frequency coefficients and load amplitude coefficients, we can more accurately correct the fatigue strength of gas cylinders. This method has a wide range of application value in the gas cylinder industry and helps to improve the safety performance and service life of gas cylinders. In actual applications, we also need to take into account various environmental factors and usage conditions, and regularly test and evaluate gas cylinders to ensure the safety performance of gas cylinders during actual use.

[0148] In some embodiments, when calculating the fatigue life of the gas cylinder according to the fatigue strength and the estimated life, it includes:

[0149] Based on the fatigue strength and estimated life, the fatigue life of the cylinder is calculated by the following formula:

[0150]

[0151] Among them, Lz is the fatigue life of the gas cylinder, L1 is the estimated life, E is the fatigue strength, g is the fatigue strength related constant, and λ is the fatigue strength related index.

[0152] It is understandable that this embodiment proposes that when we calculate the fatigue life of the gas cylinder based on the fatigue strength and the estimated life, we can adopt the following method:

[0153] First, we need to understand what factors determine the fatigue life of gas cylinders. Among these factors, fatigue strength and estimated life are two key factors. Fatigue strength reflects the fatigue resistance of gas cylinders during repeated loading and unloading, while estimated life represents the number of fatigue cycles that gas cylinders can withstand under normal use conditions.

[0154] 2. Next, we need to use the corresponding formula to calculate the fatigue life of the gas cylinder.

[0155] 3. During the calculation process, we need to ensure that the parameter values ​​used are accurate. These parameter values ​​can be obtained through experimental tests or empirical formulas. For example, the fatigue strength E and the fatigue strength related constant g can be determined by the material properties and design parameters of the gas cylinder, while the estimated life L1 and the fatigue strength related index λ need to be determined based on the actual use conditions and load conditions of the gas cylinder.

[0156] 4. Finally, based on the calculated fatigue life Lz of the gas cylinder, we can evaluate the design and use of the gas cylinder. If Lz is less than the actual service life of the gas cylinder, it means that the gas cylinder will not suffer fatigue damage during the scheduled service life; if Lz is greater than the actual service life of the gas cylinder, it indicates that the gas cylinder may have fatigue safety hazards and needs to be improved or the use conditions adjusted.

[0157] In short, through the above steps, we can calculate the fatigue life of the gas cylinder based on the fatigue strength and estimated life, thus providing strong guarantee for the design and use of the gas cylinder. In practical applications, it is also necessary to adjust and optimize according to the specific situation to ensure the safety performance and service life of the gas cylinder.

[0158] It should be pointed out that the fatigue strength related constant g and the fatigue strength related index λ need to be set according to actual conditions.

[0159] In some embodiments, when assessing the risk of using a gas cylinder based on fatigue life, the following are included:

[0160] Calculate the ratio of fatigue life to estimated life h, Classifying the risk of using the gas cylinder according to the ratio h;

[0161] A first ratio reference value h1 and a second ratio reference value h2 are preset, and 0

[0162] When h

[0163] ​​When h1≤h<h2, the risk of using the gas cylinder is judged to be medium, and monitoring and maintenance need to be strengthened;

[0164] When h≥h2, the risk of using the gas cylinder is judged to be high, and the use of the gas cylinder should be stopped immediately and replaced.

[0165] It is understandable that in order to ensure the safety performance of the gas cylinder during actual use, this embodiment proposes that the fatigue life of the gas cylinder needs to be evaluated. On this basis, a method for evaluating the risk of using the gas cylinder is proposed, which analyzes the ratio of fatigue life to estimated life to achieve effective classification and management of the risk of using the gas cylinder.

[0166] In the specific implementation, we first calculate the ratio h of the fatigue life of the gas cylinder to the estimated life. This ratio can reflect the risk level of the gas cylinder during use. Next, we pre-set two ratio reference values ​​h1 and h2, where 0

[0167] When the ratio of fatigue life to estimated life h is less than h1, we judge that the risk of using the gas cylinder is low. In this case, the gas cylinder can continue to be used. However, to ensure safety, we still need to regularly inspect and maintain the gas cylinder to ensure its stable performance.

[0168] When the ratio h is within the range of h1≤h<h2, we determine that the risk of using the gas cylinder is medium. This means that there may be certain safety hazards in the use of the gas cylinder, so it is necessary to strengthen monitoring and maintenance. During this period, we recommend more frequent inspections and maintenance of the gas cylinder to ensure its safety performance.

[0169] When the ratio h is greater than or equal to h2, we determine that the risk of using the gas cylinder is high. In this case, the safety performance of the gas cylinder has been seriously affected, and it should be stopped and replaced immediately. At this time, in order to ensure personal and property safety, we must replace the gas cylinder in time to avoid accidents.

[0170] In short, through this risk assessment method for gas cylinder use based on the ratio of fatigue life to estimated life, we can more accurately determine the risk level of gas cylinders in different usage scenarios. This helps us take targeted measures to ensure the safe use of gas cylinders and reduce the risk of accidents. In practical applications, we can also adjust the ratio reference value according to actual conditions to better meet the safety management needs of gas cylinder use in different scenarios.

[0171] like Figure 2 As shown, the present invention also proposes a gas cylinder fatigue detection system, including a data acquisition module, a data processing module, a fatigue assessment module and a warning output module; wherein, ​

[0172] The data acquisition module is used to obtain basic characteristic data of the materials used in the gas cylinder, historical usage condition data of the gas cylinder, and working data of the gas cylinder when it is working;

[0173] The data processing module is used to process and analyze the collected data and calculate the standard life, estimated life and fatigue strength of the gas cylinder;

[0174] The fatigue assessment module is used to assess the fatigue life of the gas cylinder based on the calculated fatigue strength and estimated life;

[0175] The warning output module is used to display the evaluation results and issue warnings.

[0176] It is understandable that the present invention proposes an innovative gas cylinder fatigue detection system for the use safety and life management of gas cylinders. The system is mainly composed of four modules, including a data acquisition module, a data processing module, a fatigue assessment module and an early warning output module.

[0177] First, the data acquisition module is the basic part of the present invention. Its main function is to obtain the basic characteristic data of the materials used in the gas cylinder, the historical use condition data of the gas cylinder, and the working data of the gas cylinder. These data are important bases for evaluating the fatigue life of the gas cylinder. By collecting these data, the actual situation of the gas cylinder can be fully understood.

[0178] Next, the data processing module processes and analyzes the collected data. This part mainly includes the calculation of the standard life, estimated life and fatigue strength of the gas cylinder. The standard life is determined based on the material properties and working conditions of the gas cylinder, the estimated life is predicted based on the historical usage data and current status of the gas cylinder, and the fatigue strength is calculated based on the usage and material properties of the gas cylinder.

[0179] Then, the fatigue assessment module assesses the fatigue life of the gas cylinder based on the calculated fatigue strength and estimated life. This part mainly analyzes the real-time status of the gas cylinder, predicts and assesses the fatigue life of the gas cylinder, and thus provides a scientific basis for the maintenance and management of the gas cylinder.

[0180] Finally, the early warning output module will display and warn the evaluation results. When the evaluation results show that the fatigue life of the gas cylinder is close to or exceeds the safety threshold, the early warning system will immediately issue a warning signal to remind the user to perform maintenance and treatment in time to ensure the safe use of the gas cylinder.

[0181] In general, the gas cylinder fatigue detection system proposed in the present invention forms a complete gas cylinder fatigue management process from data collection, data processing, fatigue assessment to early warning output, which helps to improve the safety of gas cylinder use and extend the service life of gas cylinders. It has important practical value and broad market prospects.

[0182] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for detecting fatigue of a gas cylinder, characterized in that: include: Obtaining basic characteristic data of materials used in gas cylinders for transporting liquefied petroleum gas, and obtaining a standard life of the gas cylinder based on the basic characteristic data; Obtain historical usage condition data of gas cylinders, adjust the standard life of gas cylinders according to the historical usage condition data, and obtain an estimated life; Obtain the working data of the gas cylinder during operation, and calculate the fatigue strength of the gas cylinder based on the working data; Calculate the fatigue life of the gas cylinder based on the fatigue strength and the estimated life, and evaluate the risk of using the gas cylinder based on the fatigue life; When obtaining basic characteristic data of materials used in gas cylinders for transporting liquefied petroleum gas and obtaining the standard life of the gas cylinders based on the basic characteristic data, it includes: The basic characteristic data include the material type, wall thickness and inner diameter of the gas cylinder; The standard life of the gas cylinder is calculated based on the material type, wall thickness and inner diameter of the gas cylinder. The calculation formula is: Wherein, L0 is the standard life, K is the material constant of the gas cylinder, T is the material thickness of the gas cylinder, and R is the inner diameter of the gas cylinder; The material constant K of the gas cylinder is calculated by the following formula: Among them, θ is the tensile strength of the material, and π is the circumference of a circle; When obtaining the historical usage condition data of the gas cylinder, adjusting the standard life of the gas cylinder according to the historical usage condition data, and obtaining the estimated life, it includes: The historical usage condition data includes environmental conditions, usage frequency and working cycle; according to the environmental conditions, usage frequency and working cycle, the environmental condition adjustment factor f1, the usage frequency adjustment factor f2 and the working cycle adjustment factor f3 are obtained respectively; The standard life of the gas cylinder is adjusted according to the environmental condition adjustment factor f1, the frequency of use adjustment factor f2 and the working cycle adjustment factor f3 to obtain the estimated life. The calculation formula is: L1=L0·f1·f2·f3; Wherein, L1 is the estimated lifespan, 0<f1<1, 0<f2<1, 0<f3<1; After obtaining the historical usage condition data of the gas cylinder, adjusting the standard life of the gas cylinder according to the historical usage condition data and obtaining the estimated life, it includes: Obtaining the total time that the liquefied petroleum gas is placed in the gas cylinder, and obtaining the corrosion probability of the gas cylinder according to the total time; The corrosion probability is calculated based on the composition and adulterants in the liquefied petroleum gas and the total time the liquefied petroleum gas is placed in the gas cylinder. The calculation formula is: P=1-e -(m1·t+m2) ; Among them, P is the corrosion probability, m1 is the influence factor of the composition and dopant of liquefied petroleum gas, m2 is the influence factor of the total time that liquefied petroleum gas is placed in the gas cylinder, t is the total time that liquefied petroleum gas is placed in the gas cylinder, and e is a natural constant; The estimated life is corrected by the corrosion probability to obtain the final estimated life, and the calculation formula is: Lx = L1·(1-P); Wherein, Lx is the final estimated lifespan; At this time, the fatigue life of the gas cylinder is calculated based on the fatigue strength and the final estimated life, and the risk of using the gas cylinder is evaluated based on the fatigue life; Obtain the working data of the gas cylinder during operation, and calculate the fatigue strength of the gas cylinder based on the working data; The working data include the pressure inside the gas cylinder, the temperature of the environment in which the gas cylinder is located, the temperature inside the gas cylinder and the pressure on the outside of the gas cylinder; The fatigue strength of the gas cylinder is calculated based on the pressure inside the gas cylinder, the temperature of the environment in which the gas cylinder is located, the temperature inside the gas cylinder and the pressure on the outside of the gas cylinder. The calculation formula is: E=r1·p0+r2·ΔQ+r3·p1; ΔQ=|Q1-Q2|; Where E is fatigue strength, p0 is the pressure inside the cylinder, Q1 is the temperature of the environment in which the cylinder is located, Q2 is the temperature inside the cylinder, ΔQ is the absolute value of the difference between the temperature of the environment in which the cylinder is located and the temperature inside the cylinder, p1 is the pressure on the outside of the cylinder, and r1, r2, and r3 are coefficients; Obtain the load conditions on the gas cylinder during operation, correct the fatigue strength according to the load conditions, and obtain the final fatigue strength; The load conditions of the gas cylinder during operation are expressed by load data. The fatigue load value is obtained by performing frequency domain analysis on the load data and then calculating according to the fatigue load spectrum. Wherein, the load data includes load frequency and load amplitude; Ex=E·(1+j1·c)·(1+j2·d); Where Ex is the ultimate fatigue strength, j1 is the load frequency coefficient, c is the load frequency, j2 is the load amplitude coefficient, and d is the load amplitude; When calculating the fatigue life of a cylinder based on the fatigue strength and estimated life, include: Based on the fatigue strength and estimated life, the fatigue life of the cylinder is calculated by the following formula: Wherein, Lz is the fatigue life of the cylinder, L1 is the estimated life, E is the fatigue strength, g is the fatigue strength related constant, and λ is the fatigue strength related index; When assessing the risk of cylinder use based on fatigue life, include: Calculate the ratio of fatigue life to estimated life h, Classifying the risk of using the gas cylinder according to the ratio h; A first ratio reference value h1 and a second ratio reference value h2 are preset, and 0<h1<h2; When h<h1, the risk of using the gas cylinder is judged to be low and it can continue to be used; When h1≤h<h2, the risk of using the gas cylinder is judged to be medium, and monitoring and maintenance need to be strengthened; When h≥h2, the risk of using the gas cylinder is judged to be high, and the use of the gas cylinder should be stopped immediately and replaced.

2. A gas cylinder fatigue detection system, used to implement the gas cylinder fatigue detection method according to claim 1, characterized in that: It includes data acquisition module, data processing module, fatigue assessment module and warning output module; among them, The data acquisition module is used to obtain basic characteristic data of the materials used in the gas cylinder, historical usage condition data of the gas cylinder, and working data of the gas cylinder when it is working; The data processing module is used to process and analyze the collected data and calculate the standard life, estimated life and fatigue strength of the gas cylinder; The fatigue assessment module is used to assess the fatigue life of the gas cylinder based on the calculated fatigue strength and estimated life; The warning output module is used to display the evaluation results and issue warnings.

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