A multidisciplinary simulation analysis method and system for the operating characteristics of a ship lubricating oil system

Abstract

This invention provides a multidisciplinary simulation analysis method and system for the operating characteristics of a ship's lubricating oil system, belonging to the field of ship simulation technology. The method includes: setting the operating parameters of the lubricating oil system; setting the interlocking control logic of the lubricating oil system; constructing an accumulator flow equation; the accumulator flow equation is constructed based on the relationship between the instantaneous pressure and instantaneous flow rate after the accumulator starts, and this relationship is determined based on the fluid resistance characteristics of the lubricating oil system, the normal operating pressure of the system, and the normal operating flow rate of the system; importing the operating parameters, interlocking control logic, and accumulator flow equation into simulation software to establish a simulation model of the lubricating oil system. This invention improves the accuracy of analyzing the impact of pressure pulsations on the lubricating oil system by setting the operating parameters of the lubricating oil system, the interlocking control logic, and the accumulator flow equation constructed based on the relationship between instantaneous pressure and flow rate, combined with the simulation model to analyze the system's operating characteristics.

Description

Technical Field

[0001] This invention relates to the field of ship simulation technology, and in particular to a multidisciplinary simulation analysis method and system for the operating characteristics of a ship lubricating oil system. Background Technology

[0002] In marine propulsion systems, the primary task of the lubricating oil system is to provide stable lubrication and cooling for the main turbine generator set and other critical equipment, ensuring the safe operation of each component. The lubricating oil system supplies lubricating oil to the equipment through the main lubricating oil pump, meeting the required pressure and temperature. However, due to the complex operating environment of marine equipment, the lubricating oil pump may experience power outages or other malfunctions, leading to a sudden drop in system pressure. Existing lubricating oil systems generally employ a standby lubricating oil pump interlocking start-up method to cope with main pump failures and quickly restore the oil supply pressure. However, the start-up process of the standby pump causes instantaneous drops and rises in system pressure, i.e., pressure pulsations. While these pressure pulsations may not have a significant impact in the short term, over time, frequent pressure pulsations can affect components such as bearings and gears in the lubricating oil system. Current technology primarily relies on experience to analyze the pressure pulsations generated during pump start-up and shutdown to assess their impact on the lubricating oil system; however, the accuracy of this analysis is relatively low.

[0003] Therefore, improving the accuracy of the analysis of the impact of pressure pulsation on the lubrication system has become an urgent technical problem to be solved. Summary of the Invention

[0004] This invention provides a multidisciplinary simulation analysis method, system, electronic device, and storage medium for the operating characteristics of a ship's lubricating oil system, in order to overcome the deficiencies in the prior art and improve the accuracy of the analysis of the impact of pressure pulsation on the lubricating oil system.

[0005] This invention provides a multidisciplinary simulation analysis method for the operating characteristics of a ship's lubricating oil system, comprising the following steps: setting the operating parameters of the lubricating oil system, wherein the operating parameters include the normal operating pressure and the normal operating flow rate of the system;

[0006] Set up the interlocking control logic of the lubricating oil system, which is used to interlock and start the standby lubricating oil pump when the main lubricating oil pump fails to work properly.

[0007] An accumulator flow equation is constructed. The accumulator flow equation is based on the relationship between the instantaneous pressure and instantaneous flow rate after the accumulator starts. The relationship is determined based on the fluid resistance characteristics of the lubricating oil system, the normal operating pressure of the system, and the normal operating flow rate of the system.

[0008] The operating parameters, the interlocking control logic, and the accumulator flow equation are imported into the simulation software to establish the lubricating oil system simulation model. The lubricating oil system simulation model is used to simulate and analyze the operating characteristics of the lubricating oil system.

[0009] According to the multidisciplinary simulation analysis method for the operating characteristics of a ship lubricating oil system provided by the present invention, the accumulator flow equation is constructed by the following method:

[0010] Based on the fluid resistance characteristics, the normal resistance loss during normal operation of the lubricating oil system and the instantaneous resistance loss after the accumulator is started are defined respectively; wherein, the normal resistance loss is non-linearly related to the normal operating flow rate of the system, and the instantaneous resistance loss is non-linearly related to the instantaneous flow rate;

[0011] A definition of instantaneous pressure is constructed, which is based on the ratio of instantaneous resistance loss to normal resistance loss and the normal operating pressure of the system.

[0012] A definition of minimum instantaneous pressure is constructed; the definition of minimum instantaneous pressure is constructed based on the relationship between instantaneous resistance loss and instantaneous flow rate;

[0013] Based on the definition of the minimum instantaneous pressure and the definition of Boyle's gas law, the flow equation of the accumulator is established.

[0014] According to the multidisciplinary simulation analysis method for the operating characteristics of a ship lubricating oil system provided by the present invention, the instantaneous resistance loss is expressed by the following formula:

[0015] ;

[0016] The normal resistance loss is expressed by the following formula:

[0017] ;

[0018] The instantaneous pressure is defined by the following formula:

[0019] ;

[0020] The definition of the minimum instantaneous pressure is expressed by the following formula:

[0021] ;

[0022] The energy storage flow equation is expressed by the following formula:

[0023] ;

[0024] Where p is the instantaneous drag loss, Where P is the normal resistance loss and P is the instantaneous pressure. The normal operating pressure of the system is q, and the instantaneous flow rate is q. This is the normal operating traffic of the system. As the first coefficient, As the second coefficient, and The value is related to the fluid resistance characteristics. Let be the minimum instantaneous pressure, q(t) be the instantaneous flow rate at time t, V(t) be the instantaneous volume of the accumulator at time t, and C be a constant.

[0025] According to the multidisciplinary simulation analysis method for the operating characteristics of a ship lubricating oil system provided by the present invention, the setting of the interlocking control logic of the lubricating oil system specifically includes:

[0026] When at most one lubricating oil pump is in operation, and it is determined that the current pressure of the lubricating oil manifold is lower than the normal operating pressure of the system, the standby lubricating oil pump is started in an interlocking manner.

[0027] According to the multidisciplinary simulation analysis method for the operating characteristics of a ship lubricating oil system provided by the present invention, the operating parameters also include: the outlet pressure at the end of operation, the system medium, the operating temperature, and the cleanliness requirements.

[0028] The present invention also provides a multidisciplinary simulation analysis system for the operating characteristics of a ship lubricating oil system, comprising the following modules: a processing module, used to set the operating parameters of the lubricating oil system, wherein the operating parameters include the normal operating pressure and the normal operating flow rate of the system;

[0029] The processing module is also used to set the interlock control logic of the lubricating oil system, which is used to interlock and start the standby lubricating oil pump when the main lubricating oil pump fails to work properly.

[0030] The processing module is also used to construct the accumulator flow equation; the accumulator flow equation is constructed based on the relationship between the instantaneous pressure and instantaneous flow rate after the accumulator starts, and the relationship is determined based on the fluid resistance characteristics of the lubricating oil system, the normal operating pressure of the system, and the normal operating flow rate of the system.

[0031] The simulation analysis module is used to import the operating parameters, the interlocking control logic, and the accumulator flow equation into the simulation software to establish the lubricating oil system simulation model. The lubricating oil system simulation model is used to simulate and analyze the operating characteristics of the lubricating oil system.

[0032] According to the multidisciplinary simulation analysis system for the operating characteristics of a ship lubricating oil system provided by the present invention, the processing module is further configured to define, based on the fluid resistance characteristics, the normal resistance loss during normal operation of the lubricating oil system and the instantaneous resistance loss after the accumulator is started; wherein, the normal resistance loss is non-linearly related to the normal operating flow rate of the system, and the instantaneous resistance loss is non-linearly related to the instantaneous flow rate;

[0033] The processing module is also used to construct a definition of instantaneous pressure, which is based on the ratio of instantaneous resistance loss to normal resistance loss and the normal operating pressure of the system.

[0034] The processing module is also used to construct a definition of minimum instantaneous pressure; the definition of minimum instantaneous pressure is constructed based on the relationship between instantaneous resistance loss and instantaneous flow rate;

[0035] The processing module is also used to establish the accumulator flow equation based on the definition of the minimum instantaneous pressure and the definition of Boyle's gas law.

[0036] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the multidisciplinary simulation analysis method for the operating characteristics of a ship lubricating oil system as described above.

[0037] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the multidisciplinary simulation analysis method for the operating characteristics of a ship lubricating oil system as described above.

[0038] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the multidisciplinary simulation analysis method for the operating characteristics of a ship lubricating oil system as described above.

[0039] In summary, one or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0040] By setting the operating parameters of the lubricating oil system, including the normal operating pressure and flow rate, the system can consistently meet basic pressure and flow requirements during actual operation, thus ensuring the lubrication and cooling effects of the equipment and guaranteeing system stability. These parameter settings provide stable foundational data for subsequent interlocking control logic and emergency compensation calculations, enabling timely response in fault conditions. By setting the interlocking control logic of the lubricating oil system, when the main lubricating oil pump fails due to a malfunction or other reasons, the interlocking control logic can automatically activate the backup lubricating oil pump, thereby preventing a sudden drop in system pressure during pump switching and ensuring continuous oil supply and normal operation of the equipment. This interlocking control logic ensures rapid system response in emergencies, giving the lubricating oil system self-regulation and emergency oil supply capabilities, thereby improving system reliability and equipment lifespan. By constructing an accumulator flow equation, the lubricating oil system can dynamically adjust the accumulator output based on instantaneous pressure and flow rate changes during pump switching. This equation is constructed based on the fluid resistance characteristics of the lubricating oil system, the relationship between the normal operating pressure and the normal operating flow rate, thus providing a precise pressure compensation scheme for the system. The establishment of this flow equation enables the accumulator to compensate for system pressure fluctuations in a timely manner, effectively mitigating pressure instability during pump switching and ensuring stable operation of the equipment during the switching process. By importing the operating parameters, interlocking control logic, and accumulator flow equation into simulation software, a simulation model of the lubricating oil system is established. This allows for simulation analysis of the system's operating characteristics without actual equipment operation. The simulation model can dynamically simulate the operating effects of the lubricating oil system under different conditions such as pump switching, pressure compensation, and emergency oil supply, thereby improving the accuracy of the analysis of the impact of pressure pulsation on the lubricating oil system. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0042] Figure 1 This is one of the flowcharts of the multidisciplinary simulation analysis method for the operating characteristics of a ship lubricating oil system provided by the present invention.

[0043] Figure 2 This is the second flowchart of the multidisciplinary simulation analysis method for the operating characteristics of a ship lubricating oil system provided by the present invention.

[0044] Figure 3 This is a schematic diagram of the multidisciplinary simulation analysis system for the operating characteristics of a ship lubricating oil system provided by the present invention.

[0045] Figure 4 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0047] It should be noted that in the description of this invention, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The terms "upper," "lower," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the system or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] The terms "first," "second," etc., used in this invention are used to distinguish similar objects, not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class, without limiting the number of objects; for example, a first object can be one or more. Furthermore, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0049] The following is combined Figures 1-4 This invention describes the multidisciplinary simulation analysis method, system, electronic equipment, and storage medium for the operating characteristics of a ship lubricating oil system.

[0050] Figure 1 This is one of the flowcharts illustrating the multidisciplinary simulation analysis method for the operating characteristics of a ship lubricating oil system provided by this invention, such as... Figure 1As shown, including but not limited to the following steps:

[0051] Step 101: Set the operating parameters of the lubricating oil system, including the normal operating pressure and normal operating flow rate of the system.

[0052] In one possible implementation, the operating parameters also include: outlet pressure at the end of the working process, system medium, operating temperature, and cleanliness requirements.

[0053] In step 101, setting the operating parameters of the lubricating oil system is to ensure that the system can consistently meet the equipment's cooling, lubrication, and safe operation requirements under various working conditions. During operation, the lubricating oil system needs to provide stable pressure and flow to ensure that the lubricating oil effectively covers the main turbine unit, generator set, and other critical components, providing necessary cooling and lubrication protection for these devices in a short time. Therefore, setting the operating parameters of the lubricating oil system is not only the foundation of the entire system design but also a crucial basis for subsequent calculations of interlocking control logic and emergency compensation capabilities.

[0054] Specifically, setting the operating parameters of a lubricating oil system includes the system's normal operating pressure and normal operating flow rate. These parameters reflect the system's basic operating state under steady conditions and are core indicators of system design. Normal operating pressure represents the minimum oil pressure the lubricating oil system needs to achieve to ensure that the lubricating oil can be delivered to various devices at the specified pressure. Normal operating flow rate specifies the amount of oil required by the system under normal operating conditions to ensure the cooling and lubrication needs of each component. In practical applications, operating parameters can further include the terminal outlet pressure, system medium characteristics (such as the viscosity and composition of the lubricating oil), operating temperature, and cleanliness requirements. These additional parameters consider the specific operating environment of the equipment and the characteristics of the lubricating oil. For example, the terminal outlet pressure relates to the minimum pressure the oil flow still needs to reach at the end of the system to prevent the oil flow from being too slow or stopping, leading to lubrication failure; the type and viscosity parameters of the system medium affect the fluidity of the oil, thus affecting the flow distribution; and cleanliness requirements ensure that the oil is free of impurities to prevent equipment damage.

[0055] Step 102: Set the interlock control logic of the lubricating oil system. The interlock control logic is used to start the standby lubricating oil pump when the main lubricating oil pump fails to work properly.

[0056] In step 102, setting the interlocking control logic of the lubricating oil system ensures that the system can automatically switch to the backup lubricating oil pump in a timely manner when special circumstances such as main lubricating oil pump failure or power outage occur, thereby guaranteeing continuous oil supply to the system. All equipment in the lubricating oil system, including the main turbine unit, generator set, and other critical components, relies on lubricating oil for lubrication and cooling. Once the lubricating oil pump stops operating, the system oil pressure will drop rapidly, potentially causing an interruption in oil supply and affecting the normal operation of the equipment. Therefore, setting the interlocking control logic to automatically start the backup pump can effectively reduce the risks to system stability caused by oil pressure fluctuations, ensuring that the lubricating oil system can continuously provide necessary lubrication and protection to the equipment in the event of an emergency.

[0057] In one possible implementation, step 102 specifically includes the following steps:

[0058] When at most one lubricating oil pump is in operation, and it is determined that the current pressure of the lubricating oil manifold is lower than the normal operating pressure of the system, the standby lubricating oil pump will be started by interlocking.

[0059] Specifically, during the operation of the lubricating oil system, when at most one lubricating oil pump is running and the current pressure in the lubricating oil manifold is lower than the normal operating pressure of the system, the interlocking start of the standby lubricating oil pump is designed to ensure that the system can maintain a continuous and stable lubrication supply in unexpected situations, avoiding equipment damage or performance degradation due to excessively low pressure. Under normal conditions, the lubricating oil system typically operates in a one-operation-one-standby mode, meaning one lubricating oil pump is working while the other serves as a backup pump for emergencies. However, if the operating lubricating oil pump malfunctions, such as stopping due to power outages or mechanical failures, the system oil pressure will drop rapidly, failing to meet the system's pressure and flow requirements. If the standby lubricating oil pump cannot start in time to restore the system oil pressure, the main turbine unit, generator set, and other critical equipment may lose lubrication protection, leading to equipment wear or temperature increases, affecting the overall system reliability and safety. Therefore, the interlocking start of the standby lubricating oil pump design can effectively cope with such emergencies and ensure stable system operation.

[0060] In practice, the pump and valve controller on the engine room monitoring console continuously monitors the current pressure status of the main lubricating oil pipe. When at most one lubricating oil pump is running, and the remaining pumps stop operating due to power failure or mechanical malfunction, and the current pressure of the main lubricating oil pipe is determined to be lower than the normal operating pressure of the system, the pump and valve controller immediately sends a start signal to the standby lubricating oil pump, interlocking to start the standby pump and allowing it to quickly take over the oil supply function of the main lubricating oil pump. During the standby pump's response, the control system maintains real-time feedback on the pressure of the main lubricating oil pipe through interlocking logic, ensuring that the standby pump's oil supply effect meets the normal operating pressure requirements and preventing pressure fluctuations from affecting the normal operation of other equipment within the system.

[0061] Step 103: Construct the accumulator flow equation; the accumulator flow equation is constructed based on the relationship between the instantaneous pressure and instantaneous flow rate after the accumulator starts up. The relationship is determined based on the fluid resistance characteristics of the lubricating oil system, the normal operating pressure of the system, and the normal operating flow rate of the system.

[0062] In step 103, the accumulator flow equation is constructed to ensure that the lubricating oil system can quickly provide stable pressure and flow compensation in the event of a main lubricating oil pump failure or power outage causing oil pressure fluctuations. Pressure fluctuations within the lubricating oil system directly affect the lubrication effect of the equipment. When the main lubricating oil pump stops working, the oil pressure will drop rapidly. At this time, although starting the standby lubricating oil pump can restore the system's oil supply in a short time, the system oil pressure will experience fluctuations in pressure drop and recovery during the switching period, which may adversely affect the normal operation of various equipment in the system. As an emergency compensation device for the system, the accumulator can provide short-term pressure and flow support during this process, mitigating the impact of pressure drop. Therefore, constructing an accumulator flow equation based on the fluid resistance characteristics of the lubricating oil system can provide theoretical support for the design, enabling the accumulator to respond quickly during pressure fluctuations, thereby optimizing the system's emergency oil supply performance.

[0063] In one possible implementation, refer to Figure 2 , Figure 2 This is the second flowchart of the multidisciplinary simulation analysis method for the operating characteristics of a ship lubricating oil system provided by the present invention, as shown below. Figure 2 As shown, the method for constructing the accumulator flow equation specifically includes steps 201-204:

[0064] Step 201: Based on the fluid resistance characteristics, define the normal resistance loss when the lubricating oil system is working normally and the instantaneous resistance loss after the accumulator is started; among them, the normal resistance loss is non-linearly related to the normal working flow rate of the system, and the instantaneous resistance loss is non-linearly related to the instantaneous flow rate.

[0065] In one possible implementation, the instantaneous drag loss is expressed by the following formula:

[0066] ;

[0067] Normal drag loss is expressed by the following formula:

[0068] ;

[0069] Where p is the instantaneous resistance loss, The normal resistance loss is P, where P is the instantaneous pressure. The system's normal operating pressure is given by q, where q is the instantaneous flow rate. For normal system operation traffic, As the first coefficient, As the second coefficient, and The value is related to the fluid resistance characteristics.

[0070] In step 201, to accurately describe the fluid resistance characteristics of the lubricating oil system and construct an expression for instantaneous resistance loss, we need to analyze the resistance loss of the lubricating oil system under different operating conditions in detail. The fluid resistance characteristics of the lubricating oil system are mainly reflected in three aspects: friction loss, local resistance loss, and porous media resistance loss. Precise definitions of these resistance losses can provide reliable theoretical support for the subsequent accumulator flow equation, ensuring that the lubricating oil system can respond quickly and provide stable pressure compensation when the main lubricating oil pump switches.

[0071] First, friction loss along the friction path. This refers to the continuous resistance generated when oil flows along the pipelines of the lubrication system. This resistance loss can be expressed by the formula... The calculation is performed, where λ is the friction loss coefficient, l is the pipe length, d is the pipe diameter, ρ is the fluid density, and ν is the fluid velocity. This friction loss is proportional to the pipe length and the square of the fluid velocity; the higher the velocity, the greater the friction loss.

[0072] Secondly, local resistance loss This reflects the resistance generated when oil flows through local structures in the pipeline (such as elbows, oil coolers, oil filters, etc.). Local resistance loss can be expressed by the formula... The calculation is performed, where ξ is the local resistance coefficient, which is still proportional to the square of the fluid velocity. Local resistance loss characterizes the influence of various local structures within the system on oil flow and is an important factor affecting system pressure fluctuations when the flow rate changes.

[0073] Finally, the resistance loss of porous media This represents the resistance generated when oil passes through a porous structure. The formula for calculating this resistance loss is: Where K is the porous media resistance coefficient, Q is the flow rate, A is the flow area, and μ is the dynamic viscosity. Unlike the first two terms, the porous media resistance loss is closely related to the linear relationship with the flow rate, and is an important influencing factor under low flow rate conditions.

[0074] Combining the friction loss, local friction loss, and porous medium friction loss, the instantaneous friction loss p is expressed as follows: .

[0075] In this expression, both friction loss and local resistance loss terms are proportional to the square of the flow velocity, while the resistance loss in porous media is closely related to the linear relationship with the flow rate. Since the square of the flow velocity is equivalent to the square of the flow rate, the expression for the instantaneous resistance loss simplifies to: Similarly, the simplified expression for normal drag loss is obtained: Through these simplified expressions, both instantaneous and normal resistance losses can be represented by the square and linear terms of the flow rate, allowing for a precise description of flow rate changes in the lubricating oil system during main pump failure or standby pump switching. This results in a clear representation of the relationship between system flow rate and resistance under different operating conditions, facilitating the subsequent construction of the accumulator flow equation.

[0076] Step 202: Construct the definition of instantaneous pressure. The definition of instantaneous pressure is based on the ratio of instantaneous resistance loss to normal resistance loss and the normal operating pressure of the system.

[0077] In one possible implementation, the instantaneous pressure is defined by the following formula:

[0078] ;

[0079] Where p is the instantaneous resistance loss, The normal resistance loss is P, where P is the instantaneous pressure. The system's normal operating pressure is given by q, where q is the instantaneous flow rate. For normal system operation traffic, As the first coefficient, As the second coefficient, and The value is related to the fluid resistance characteristics.

[0080] In step 202, the definition of instantaneous pressure is established to accurately describe the system pressure changes under instantaneous conditions when the main lubricating pump fails or switches to the standby lubricating pump. Since switching lubricating pumps causes flow fluctuations, the system's instantaneous pressure will also fluctuate. To ensure system pressure stability during transitions and to provide a reference for subsequent accumulator compensation, it is necessary to establish a definition of instantaneous pressure to accurately calculate the pressure state under different instantaneous flow rates and maintain effective system control.

[0081] Specifically, the definition of instantaneous pressure is constructed based on the ratio of instantaneous resistance loss to normal resistance loss and the normal operating pressure of the system. Therefore The numerator represents the instantaneous drag loss, and the denominator represents the normal drag loss. The ratio of the two reflects the proportion of drag change in the instantaneous state relative to the normal state.

[0082] It should be noted that after obtaining the definition of instantaneous pressure, further analysis of instantaneous flow rate q and normal system flow rate is needed. The ratio relationship can be used to derive the reasonable range of instantaneous pressure. This is because in actual operation, instantaneous flow is usually less than the normal operating flow of the system. This condition can be used to constrain the range of instantaneous pressure.

[0083] Based on these conditions, we can derive the expressions for the upper and lower limits of instantaneous pressure. The instantaneous pressure P varies within this range. Since the oil-using equipment in the lubrication system cannot provide a defined flow resistance characteristic during fault switching, the accumulator's role is to provide dynamic compensation based on changes in instantaneous pressure. Therefore, the condition for determining whether the accumulator should activate can be achieved by limiting the range of instantaneous pressure and flow rate, ensuring that the accumulator's output is triggered under specific pressure and flow rate conditions.

[0084] Specifically, the activation condition of the accumulator can be defined as: when the instantaneous pressure P satisfies And the instantaneous flow rate q satisfies When the pressure and flow rate reach critical ranges, the accumulator should activate to provide necessary pressure compensation. This condition definition allows for rapid activation of the accumulator when pressure and flow reach critical ranges, ensuring timely replenishment of system pressure.

[0085] Step 203: Construct the definition of minimum instantaneous pressure; the definition of minimum instantaneous pressure is constructed based on the relationship between instantaneous resistance loss and instantaneous flow rate.

[0086] In one possible implementation, the minimum instantaneous pressure is defined by the following formula:

[0087] ;

[0088] Where q is the instantaneous flow rate. As the first coefficient, The value is related to fluid resistance characteristics. This represents the minimum instantaneous pressure.

[0089] In step 203, the definition of the minimum instantaneous pressure is established to ensure that the pressure within the system does not fall below a certain safety threshold during lubrication system failures or when switching to a standby lubrication pump, thereby preventing insufficient lubrication or overheating of the equipment due to low oil pressure. Since the lubrication system experiences instantaneous pressure fluctuations during transitional states, a minimum instantaneous pressure value needs to be set to ensure safe system operation. This value triggers the accumulator's emergency compensation mechanism when the pressure drops to that value, balancing the system pressure and ensuring the stability of the equipment under critical conditions.

[0090] Specifically, the definition of minimum instantaneous pressure is constructed based on the relationship between instantaneous resistance loss and system flow rate. Since the expression for instantaneous resistance loss is... Furthermore, the instantaneous flow rate is typically lower than the normal operating flow rate during lubricating pump failure or switching. Therefore, the lower limit of instantaneous pressure can be defined using a simplified form of instantaneous resistance loss. To ensure system safety, we set the minimum instantaneous pressure to be [value missing]. That is, when the system flow rate is low, the lower limit of the system pressure is dominated by friction loss.

[0091] Step 204: Based on the definition of minimum instantaneous pressure and Boyle's gas law, establish the accumulator flow equation.

[0092] Boyle's gas law is defined by the following formula:

[0093] ;

[0094] The accumulator flow equation is expressed by the following formula:

[0095] ;

[0096] in, is the first coefficient, n is the polytropic index of the gas, q(t) is the instantaneous flow rate at time t, V(t) is the instantaneous volume of the accumulator at time t, and C is a constant.

[0097] In step 204, based on the definition of minimum instantaneous pressure and Boyle's gas law, the accumulator flow equation is established to ensure stable pressure and flow compensation during lubricating oil system failures or pump switching, thereby ensuring smooth system operation in transitional states. Under normal conditions, the lubricating oil system receives stable pressure and flow from the main pump, but when the main pump fails, the oil pressure within the system drops rapidly. In this situation, the accumulator can maintain system stability by compensating for pressure. However, to accurately control the accumulator's output and ensure it provides compensation at the appropriate time, a precise flow equation needs to be established.

[0098] In the lubricating oil system, it is assumed that there is no heat exchange between the gas inside the accumulator and the external environment during the gas state change process; therefore, it is an adiabatic process, and n=1.4 is taken. Based on this, the flow equation of the accumulator can be constructed as follows: setting the initial pressure and volume conditions. It also links instantaneous flow rate and volume to system pressure changes, enabling the accumulator to provide immediate compensation when the pressure drops below the minimum instantaneous pressure.

[0099] The flow equation of the accumulator is finally expressed as This equation enables precise control of the accumulator under different flow and pressure conditions, ensuring that the system pressure is close to or below the minimum instantaneous pressure P. min At that time, the accumulator can respond immediately and provide corresponding flow and pressure compensation.

[0100] Step 104: Import the operating parameters, interlocking control logic, and accumulator flow equation into the simulation software to establish a lubricating oil system simulation model. The lubricating oil system simulation model is used to simulate and analyze the operating characteristics of the lubricating oil system.

[0101] In step 104, the purpose of importing the operating parameters, interlocking control logic, and accumulator flow equation into the simulation software to establish a simulation model of the lubricating oil system is to verify the operating characteristics of the lubricating oil system under conditions of main lubricating oil pump failure or switching to the standby lubricating oil pump through computer simulation without conducting actual experiments, ensuring the pressure and flow stability of the system in emergency situations. The real-time operation of the lubricating oil system involves multiple complex factors, such as pressure fluctuations, flow changes, and instantaneous resistance losses. Through the simulation model, these factors can be comprehensively considered, thereby accurately evaluating the dynamic response behavior of the system and providing data support for system optimization and fault prevention.

[0102] Specifically, pre-defined operating parameters, including normal operating pressure, normal operating flow rate, and system medium characteristics, are input into the simulation software as the system's basic parameters. Furthermore, the introduction of interlocking control logic enables the model to automatically identify main lubricating pump failure conditions during simulation and promptly activate the standby lubricating pump according to pre-defined conditions, achieving a high degree of fidelity simulation of actual operating scenarios. The interlocking control logic in the simulation model can accurately reproduce the logical judgment process of emergency oil supply. For example, when the lubricating oil main pressure is lower than the normal operating pressure and only one lubricating pump is running, the model will simulate the pump valve controller issuing a signal to activate the standby pump and automatically switch, ensuring the realism of the simulation results.

[0103] Meanwhile, the introduction of the accumulator flow equation ensures accurate simulation of the accumulator's compensation effect during pressure fluctuations. This is achieved by using the accumulator flow equation... By inputting the model, the system can calculate the accumulator response in real time under different instantaneous flow and pressure conditions. This allows the model to simulate the dynamic compensation effect of the accumulator on pressure and flow during oil pump switching, thereby avoiding lubrication interruption or equipment wear caused by sudden pressure drop or insufficient flow.

[0104] Reference Figure 3 , Figure 3 This is a schematic diagram of the multidisciplinary simulation analysis system for the operating characteristics of a ship lubricating oil system provided by the present invention. The system includes: a processing module, used to set the operating parameters of the lubricating oil system, including the normal operating pressure and the normal operating flow rate of the system.

[0105] The processing module is also used to set the interlock control logic of the lubricating oil system. The interlock control logic is used to start the standby lubricating oil pump when the main lubricating oil pump fails to work properly.

[0106] The processing module is also used to construct the accumulator flow equation; the accumulator flow equation is constructed based on the relationship between the instantaneous pressure and instantaneous flow after the accumulator starts, and the relationship is determined based on the fluid resistance characteristics of the lubricating oil system, the normal operating pressure of the system, and the normal operating flow of the system.

[0107] The simulation analysis module is used to import operating parameters, interlocking control logic, and accumulator flow equations into the simulation software to establish a simulation model of the lubricating oil system. The simulation model of the lubricating oil system is used to simulate and analyze the operating characteristics of the lubricating oil system.

[0108] In one possible implementation, the processing module is further configured to define, based on fluid resistance characteristics, the normal resistance loss during normal operation of the lubricating oil system and the instantaneous resistance loss after the accumulator is started; wherein, the normal resistance loss is non-linearly related to the normal operating flow rate of the system, and the instantaneous resistance loss is non-linearly related to the instantaneous flow rate.

[0109] The processing module is also used to construct the definition of instantaneous pressure, which is based on the ratio of instantaneous resistance loss to normal resistance loss and the normal operating pressure of the system.

[0110] The processing module is also used to construct the definition of minimum instantaneous pressure; the definition of minimum instantaneous pressure is constructed based on the relationship between instantaneous resistance loss and instantaneous flow rate.

[0111] The processing module is also used to establish the accumulator flow equation based on the definition of minimum instantaneous pressure and the definition of Boyle's gas law.

[0112] In one possible implementation, the processing module is further configured to interlock and start the standby oil pump when at most one oil pump is in operation and it is determined that the current pressure of the oil manifold is lower than the normal operating pressure of the system.

[0113] It should be noted that the multidisciplinary simulation analysis system for the operating characteristics of the ship lubricating oil system provided by the present invention can execute the multidisciplinary simulation analysis method for the operating characteristics of the ship lubricating oil system of any of the above embodiments during specific operation, which will not be elaborated in this embodiment.

[0114] Figure 4 This is a schematic diagram of the structure of the electronic device provided by the present invention, such as... Figure 4As shown, the electronic device may include: a processor 410, a communication interface 420, a memory 430, and a communication bus 440. The processor 410, communication interface 420, and memory 430 communicate with each other via the communication bus 440. The processor 410 can call logic instructions in the memory 430 to execute a multidisciplinary simulation analysis method for the operating characteristics of a ship's lubricating oil system. This method includes: setting the operating parameters of the lubricating oil system, including the normal operating pressure and normal operating flow rate; setting the interlocking control logic of the lubricating oil system, which is used to interlock and start the standby lubricating oil pump when the main lubricating oil pump fails to operate normally; constructing the accumulator flow equation, which is based on the relationship between the instantaneous pressure and instantaneous flow rate after the accumulator starts, and this relationship is determined based on the fluid resistance characteristics of the lubricating oil system, the normal operating pressure, and the normal operating flow rate; and importing the operating parameters, interlocking control logic, and accumulator flow equation into simulation software to establish a lubricating oil system simulation model, which is used to simulate and analyze the operating characteristics of the lubricating oil system.

[0115] Furthermore, the logical instructions in the aforementioned memory 430 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0116] On the other hand, the present invention also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions, and when the program instructions are executed by the computer, the computer can execute the multidisciplinary simulation analysis method for the operating characteristics of the ship lubricating oil system provided in the above embodiments. The method includes: setting the operating parameters of the lubricating oil system, including the normal operating pressure and the normal operating flow rate of the system; setting the interlocking control logic of the lubricating oil system, which is used to interlock and start the standby lubricating oil pump when the main lubricating oil pump fails to work normally; constructing the accumulator flow equation; the accumulator flow equation is constructed based on the relationship between the instantaneous pressure and the instantaneous flow rate after the accumulator is started, and the relationship is determined based on the fluid resistance characteristics of the lubricating oil system, the normal operating pressure of the system, and the normal operating flow rate of the system; importing the operating parameters, the interlocking control logic, and the accumulator flow equation into simulation software to establish a lubricating oil system simulation model, which is used to simulate and analyze the operating characteristics of the lubricating oil system.

[0117] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon. When executed by processor 410, the computer program is implemented to perform the multidisciplinary simulation analysis method for the operating characteristics of the ship lubricating oil system provided in the above embodiments. The method includes: setting the operating parameters of the lubricating oil system, including the normal operating pressure and the normal operating flow rate of the system; setting the interlocking control logic of the lubricating oil system, which is used to interlock and start the standby lubricating oil pump when the main lubricating oil pump fails to operate normally; constructing the accumulator flow equation; the accumulator flow equation is constructed based on the relationship between the instantaneous pressure and the instantaneous flow rate after the accumulator is started, and the relationship is determined based on the fluid resistance characteristics of the lubricating oil system, the normal operating pressure of the system, and the normal operating flow rate of the system; importing the operating parameters, the interlocking control logic, and the accumulator flow equation into simulation software to establish a lubricating oil system simulation model, which is used to simulate and analyze the operating characteristics of the lubricating oil system.

[0118] The system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0119] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of various embodiments or some parts of embodiments.

[0120] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for multi-disciplinary simulation analysis of operating characteristics of a marine lubricating oil system, characterized in that, The method comprises the following steps: setting working parameters of the lubricating oil system, the working parameters comprising normal working pressure of the system and normal working flow of the system; setting interlocking control logic of the lubricating oil system, the interlocking control logic being used to start a standby lubricating oil pump in interlocking when a main lubricating oil pump cannot work normally; constructing an accumulator flow equation; the accumulator flow equation being constructed based on a relationship between instantaneous pressure and instantaneous flow after starting of the accumulator, the relationship being determined based on fluid resistance characteristics of the lubricating oil system, the normal working pressure of the system and the normal working flow of the system; the accumulator flow equation being constructed by the following method: defining normal resistance loss and instantaneous resistance loss after starting of the accumulator respectively based on the fluid resistance characteristics when the lubricating oil system works normally; wherein the normal resistance loss is nonlinearly related to the normal working flow of the system, and the instantaneous resistance loss is nonlinearly related to the instantaneous flow; constructing a definition formula of instantaneous pressure; constructing a definition formula of minimum instantaneous pressure; establishing the accumulator flow equation based on the definition formula of the minimum instantaneous pressure and a definition formula of Boyle's gas law; the instantaneous resistance loss being represented by the following formula: ； the normal resistance loss being represented by the following formula: ； the definition formula of the instantaneous pressure being represented by the following formula: ； the definition formula of the minimum instantaneous pressure being represented by the following formula: ； the accumulator flow equation being represented by the following formula: ； where p is the instantaneous pressure loss, P is the normal pressure loss, P is the normal pressure loss, P is the normal pressure loss, P is the normal pressure loss, P is the normal pressure loss, P is the normal pressure loss, P is the normal pressure loss, P is the normal pressure loss, q(t) is the instantaneous flow rate at time t, V(t) is the instantaneous volume of the accumulator at time t, and C is a constant. introducing the working parameters, the interlocking control logic and the accumulator flow equation into simulation software to establish a simulation model of the lubricating oil system, the simulation model of the lubricating oil system being used to simulate and analyze running characteristics of the lubricating oil system.

2. The ship lubricating oil system operational characteristics multi-disciplinary simulation analysis method according to claim 1, characterized in that, The setting of the interlocking control logic of the lubricating oil system specifically comprises: starting the standby lubricating oil pump in interlocking when at most one lubricating oil pump is in a running state and it is determined that the current pressure of the lubricating oil manifold is lower than the normal working pressure of the system.

3. The method of claim 1, wherein, The working parameters further comprise working outlet pressure, system medium, working temperature and cleanliness requirement.

4. A system for multi-disciplinary simulation analysis of operating characteristics of a marine lubricating oil system, characterized in that, The method comprises the following steps: a processing module is used to set working parameters of the lubricating oil system, the working parameters comprising normal working pressure of the system and normal working flow of the system; the processing module is further used to set interlocking control logic of the lubricating oil system, the interlocking control logic being used to start a standby lubricating oil pump in interlocking when a main lubricating oil pump cannot work normally; the processing module is further used to construct an accumulator flow equation; the accumulator flow equation being constructed based on a relationship between instantaneous pressure and instantaneous flow after starting of the accumulator, the relationship being determined based on fluid resistance characteristics of the lubricating oil system, the normal working pressure of the system and the normal working flow of the system; the processing module is further used to define normal resistance loss and instantaneous resistance loss after starting of the accumulator respectively based on the fluid resistance characteristics when the lubricating oil system works normally; wherein the normal resistance loss is nonlinearly related to the normal working flow of the system, and the instantaneous resistance loss is nonlinearly related to the instantaneous flow; the processing module is further used to construct a definition formula of instantaneous pressure; the processing module is further used to construct a definition formula of minimum instantaneous pressure; The processing module is further configured to establish the accumulator flow equation based on a definition formula of the minimum instantaneous pressure and a definition formula of the Boyle gas law; The instantaneous resistance loss is represented by the following formula: ； The normal resistance loss is represented by the following formula: ； The definition formula of the instantaneous pressure is represented by the following formula: ； The definition formula of the minimum instantaneous pressure is represented by the following formula: ； The accumulator flow equation is represented by the following formula: ； where p is the instantaneous pressure loss, P is the normal pressure loss, P is the normal pressure loss, P is the normal pressure loss, P is the normal pressure loss, P is the normal pressure loss, P is the normal pressure loss, P is the normal pressure loss, P is the normal pressure loss, q(t) is the instantaneous flow rate at time t, V(t) is the instantaneous volume of the accumulator at time t, and C is a constant. The simulation analysis module is configured to import the working parameters, the interlock control logic and the accumulator flow equation into a simulation software to establish the lubricating oil system simulation model, and the lubricating oil system simulation model is configured to simulate and analyze the running characteristics of the lubricating oil system.

5. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The computer program, when executed by the processor, implements the ship lubricating oil system running characteristic multi-disciplinary simulation analysis method according to any one of claims 1-3.

6. A non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program, when executed by the processor, implements the ship lubricating oil system running characteristic multi-disciplinary simulation analysis method according to any one of claims 1-3.

7. A computer program product comprising a computer program, characterized in that, The computer program, when executed by the processor, implements the ship lubricating oil system running characteristic multi-disciplinary simulation analysis method according to any one of claims 1-3.

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