Ship variable frequency pump control method and ship

Abstract

This invention relates to the field of marine technology, providing a method for controlling a variable frequency pump (VFP) on a ship and a ship thereof. The method includes: determining the target flow rate, target head, and target noise of the VFP; determining a target comprehensive performance evaluation value based on the target flow rate, target head, and target noise; determining the target output voltage and target output frequency of the VFP based on the target comprehensive performance evaluation value; and controlling the VFP to operate at the target output voltage and target output frequency. This invention determines the target comprehensive performance evaluation value based on the ship's real-time operating conditions, target flow rate, target head, and target noise, thereby determining the target output voltage and target output frequency, and controlling the VFP to operate at the target output voltage and target output frequency, thus meeting the comprehensive requirements for the target flow rate, target head, and target noise of the VFP.

Description

Technical Field

[0001] This invention relates to the field of marine technology, and in particular to a method for controlling a variable frequency pump in a ship and a ship thereof. Background Technology

[0002] As a key piece of equipment in a ship's power system and fluid transport system, the noise generated during the operation of a variable frequency pump is a significant source of navigation noise. The noise generation mechanism of variable frequency pumps is extremely complex, involving the coupling effects of multiple physical fields such as fluid dynamics, solid structure mechanics, and acoustics—a phenomenon known as fluid-structure-acoustic multi-physics coupling. Under this complex coupling, the flow state of the fluid inside the pump, the vibration of the impeller and pump casing, and the resulting noise radiation interact and constrain each other during operation, making it difficult to implement a comprehensive and perfect low-noise design for variable frequency pumps during the design phase.

[0003] Currently, traditional ship variable frequency pump control methods primarily focus on meeting the basic functional requirements of the pump set, such as flow rate and head. In actual operation, these control methods often adjust parameters such as the pump's speed according to the fluid transport requirements under different ship operating conditions to ensure the pump set can provide the required flow rate and head, thus ensuring the normal operation of related ship systems. However, this function-oriented control method largely ignores the noise problem during the operation of the variable frequency pump, making it difficult to achieve the goal of low-noise operation. Summary of the Invention

[0004] This invention provides a ship variable frequency pump control method and a ship, which solves the problem that existing ship variable frequency pump control methods cannot simultaneously meet functional and noise targets.

[0005] This invention provides a method for controlling a marine variable frequency pump, comprising: determining a target flow rate, a target head, and a target noise level of the variable frequency pump; determining a target comprehensive performance evaluation value based on the target flow rate, the target head, and the target noise level; determining a target output voltage and a target output frequency of the variable frequency pump based on the target comprehensive performance evaluation value; and controlling the variable frequency pump to operate at the target output voltage and the target output frequency.

[0006] According to a method for controlling a ship variable frequency pump provided by the present invention, a target comprehensive performance evaluation value is determined based on the target flow rate, the target head, and the target noise; the method includes: determining the proportion of the target flow rate, the proportion of the target head, and the proportion of the target noise based on the target flow rate, the target head, and the target noise; determining a preset comprehensive performance evaluation value according to the relationship between preset output voltage, preset output frequency, preset flow rate, preset head, preset noise, the proportion of the target flow rate, the proportion of the target head, and the proportion of the target noise; and determining the maximum value among a plurality of preset comprehensive performance evaluation values ​​as the target comprehensive performance evaluation value.

[0007] According to a ship variable frequency pump control method provided by the present invention, a preset comprehensive performance evaluation value is determined based on the relationship between preset output voltage, preset output frequency, preset flow rate, preset head, preset noise, the proportion of the target flow rate, the proportion of the target head, and the proportion of the target noise; the method includes: determining the preset flow rate, the preset head, and the preset noise; and determining the preset comprehensive performance evaluation value according to the following formula.

[0008]

[0009]

[0010] The preset comprehensive performance evaluation value is μ; the preset flow rate is Q. 预设 The preset head is H. 预设 The preset noise level is S. 预设 The weight of the target flow rate is α, 0 < α < 1; the weight of the target head is β, 0 < β < 1; the weight of the target noise is γ, 0 < γ < 1.

[0011] According to a method for controlling a marine variable frequency pump provided by the present invention, determining the preset flow rate, the preset head, and the preset noise includes: determining, under a fixed preset output voltage, real-time flow rate, real-time head, and real-time noise at multiple preset output frequencies; determining, under a fixed preset output frequency, real-time flow rate, real-time head, and real-time noise at multiple preset output voltages; determining the maximum real-time flow rate, minimum real-time flow rate, maximum real-time head, minimum real-time head, maximum real-time noise, and minimum real-time noise; determining the preset flow rate based on the real-time flow rate, the maximum real-time flow rate, and the minimum real-time flow rate; determining the preset head based on the real-time head, the maximum real-time head, and the minimum real-time head; and determining the preset noise based on the real-time noise, the maximum real-time noise, and the minimum real-time noise.

[0012] According to a method for controlling a ship's variable frequency pump provided by the present invention, the preset flow rate is determined based on the real-time flow rate, the maximum real-time flow rate, and the minimum real-time flow rate, including:

[0013]

[0014] The real-time traffic is Q. 实时 The maximum real-time traffic Q max and the minimum real-time flow Q min .

[0015] According to the present invention, a method for controlling a ship's variable frequency pump determines a preset head based on the real-time head, the maximum real-time head, and the minimum real-time head; including:

[0016]

[0017] The real-time head is H 实时 The maximum real-time head H max and the minimum real-time head H min .

[0018] According to the present invention, a ship variable frequency pump control method determines a preset noise based on the real-time noise, the maximum real-time noise, and the minimum real-time noise; including:

[0019]

[0020] The real-time traffic is S 实时 The maximum flow rate S max and the minimum flow rate S min .

[0021] According to a method for controlling a ship variable frequency pump provided by the present invention, under the condition that the preset output voltage is constant, the method determines the real-time flow rate, real-time head, and real-time noise at multiple preset output frequencies; under the condition that the preset output frequency is constant, the method determines the real-time flow rate, real-time head, and real-time noise at multiple preset output voltages; including: under the condition that the preset output voltage and the preset output frequency are constant, acquiring multiple current flow rates, multiple current heads, and multiple current noises within a preset time period; determining the average of the multiple current flow rates as the real-time flow rate; determining the average of the multiple current heads as the real-time head; and determining the average of the multiple current noises as the real-time noise.

[0022] The present invention also provides a ship, including a variable frequency pump, a variable frequency controller, and a control device, wherein the variable frequency controller is electrically connected to the variable frequency pump and the variable frequency controller is communicatively connected to the control device.

[0023] According to the present invention, a ship further includes a flow sensor, a pressure sensor, and a hydrophone. The flow sensor, the pressure sensor, and the hydrophone are all located at the outlet of the variable frequency pump. The flow sensor is used to acquire the flow rate at the outlet of the variable frequency pump, the pressure sensor is used to acquire the pressure at the outlet of the variable frequency pump, and the hydrophone is used to acquire the noise at the outlet of the variable frequency pump. The flow sensor, the pressure sensor, and the hydrophone are all communicatively connected to the control device.

[0024] The present invention provides a ship variable frequency pump control method and a ship, which determines the target comprehensive performance evaluation value based on the ship's real-time operating conditions, target flow rate, target head and target noise, thereby determining the target output voltage and target output frequency, and controlling the variable frequency pump to operate at the target output voltage and target output frequency to meet the comprehensive requirements of the variable frequency pump for target flow rate, target head and target noise. Attached Figure Description

[0025] 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.

[0026] Figure 1 This is a flowchart illustrating the ship variable frequency pump control method provided by the present invention.

[0027] Figure 2 This is a partial structural schematic diagram of the ship provided by the present invention.

[0028] Figure label:

[0029] 1. Variable frequency pump; 2. Variable frequency controller; 3. Flow sensor; 4. Pressure sensor; 5. Hydrometer. Detailed Implementation

[0030] 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.

[0031] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0032] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0035] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. Additionally, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0036] The following is combined with Figures 1-2 The present invention describes a ship variable frequency pump control method and a ship.

[0037] refer to Figure 1 The ship variable frequency pump control method provided in this embodiment of the invention includes: step 100, determining the target flow rate, target head, and target noise of the variable frequency pump; step 200, determining the target comprehensive performance evaluation value based on the target flow rate, target head, and target noise; step 300, determining the target output voltage and target output frequency of the variable frequency pump based on the target comprehensive performance evaluation value; and step 400, controlling the variable frequency pump to operate at the target output voltage and target output frequency.

[0038] Step 200: Determine the target comprehensive performance evaluation value based on the target flow rate, target head, and target noise; including: Step 210: Determine the weight of the target flow rate, the weight of the target head, and the weight of the target noise based on the target flow rate, target head, and target noise; Step 220: Determine the preset comprehensive performance evaluation value according to the relationship between preset output voltage, preset output frequency, preset flow rate, preset head, preset noise, the weight of the target flow rate, the weight of the target head, and the weight of the target noise; Step 230: Determine the maximum value among multiple preset comprehensive performance evaluation values ​​as the target comprehensive performance evaluation value.

[0039] Step 220: Determine the preset comprehensive performance evaluation value based on the relationship between preset output voltage, preset output frequency, preset flow rate, preset head, preset noise, the proportion of target flow rate, the proportion of target head, and the proportion of target noise; including: Step 221: Determine the preset flow rate, preset head, and preset noise; Step 222: Determine the preset comprehensive performance evaluation value according to the following formula.

[0040]

[0041] ;

[0042] The preset comprehensive performance evaluation value is μ; the preset flow rate is Q. 预设 The preset head is H. 预设 The preset noise level is S. 预设 The weight of the target flow rate is α, 0 < α < 1; the weight of the target head is β, 0 < β < 1; the weight of the target noise is γ, 0 < γ < 1.

[0043] Step 221, determining preset flow rate, preset head, and preset noise; including: Step 221a, determining real-time flow rate, real-time head, and real-time noise at multiple preset output frequencies, given a fixed preset output voltage; and determining real-time flow rate, real-time head, and real-time noise at multiple preset output voltages, given a fixed preset output frequency. Specifically, given a fixed preset output voltage and preset output frequency, acquiring multiple current flow rates, multiple current heads, and multiple current noises within a preset time period; determining the average of the multiple current flow rates as the real-time flow rate; determining the average of the multiple current heads as the real-time head; and determining the average of the multiple current noises as the real-time noise.

[0044] Step 221b: Determine the maximum real-time flow rate, minimum real-time flow rate, maximum real-time head, minimum real-time head, maximum real-time noise, and minimum real-time noise.

[0045] Step 221c: Determine the preset traffic based on real-time traffic, maximum real-time traffic, and minimum real-time traffic; specifically, according to... Real-time traffic is Q 实时 Maximum real-time traffic Q max and minimum real-time traffic Q min .

[0046] The preset head is determined based on the real-time head, maximum real-time head, and minimum real-time head; specifically, according to... The real-time head is H. 实时 Maximum real-time head H max and minimum real-time head H min .

[0047] Based on real-time noise, maximum real-time noise, and minimum real-time noise, a preset noise level is determined; specifically, according to... Real-time traffic is S 实时 Maximum flow rate S max and minimum flow S min .

[0048] like Figure 2 As shown, the outlet of the variable frequency pump is equipped with a flow sensor 3, a pressure sensor 4, and a hydrophone 5. The flow sensor 3 is used to obtain the flow rate at the outlet of the variable frequency pump, the pressure sensor 4 is used to obtain the pressure at the outlet of the variable frequency pump, and the hydrophone is used to obtain the noise at the outlet of the variable frequency pump.

[0049] Given a fixed preset output voltage and preset output frequency, within a preset time period [t] a , t b [The text appears to be a fragmented collection of keywords and phrases related to current traffic, specifically Q1, Q2, Q3, and Q4. A direct translation isn't meaningful as it's not a coherent sentence or paragraph.] k Given K data points, the real-time flow rate of the variable frequency pump over the time period [t] is... a , tb The average current traffic within [the area], i.e. .

[0050] Given a fixed preset output voltage and preset output frequency, within a preset time period [t] a , t b [The text appears to be a fragmented collection of characters and symbols, possibly related to a machine translation error. A direct translation wouldn't be meaningful without further context.] k Given a total of K data points, the real-time head of the variable frequency pump is determined over the time period [t]. a , t b The average current head within the range, i.e. .

[0051] Given a fixed preset output voltage and preset output frequency, within a preset time period [t] a , t b [The text appears to be a fragmented collection of characters and symbols, possibly related to noise or noise. A direct translation isn't possible without further context or clarification.] k Given a total of K data points, the real-time noise of the variable frequency pump is given by the time interval [t]. a , t b The mean of the current noise within the range, i.e. .

[0052] With a fixed preset output voltage, determine the real-time flow rate, real-time head, and real-time noise at multiple preset output frequencies. For example, with a fixed preset output voltage, determine the real-time flow rate, real-time head, and real-time noise at n preset output frequencies, for a total of n data points. With a fixed preset output frequency, determine the real-time flow rate, real-time head, and real-time noise at multiple preset output voltages. For example, with a fixed preset output frequency, determine the real-time flow rate, real-time head, and real-time noise at m preset output frequencies, for a total of m data points. Thus, the preset output voltage and preset output frequency of the variable frequency pump have a total of... This combination method, in The real-time flow rate, real-time head, and real-time noise of the variable frequency pump were obtained under the various combination methods, as shown in Table 1.

[0053] Table 1. Real-time flow rate, real-time head, and real-time noise data under different preset output frequencies and preset output voltages.

[0054]

[0055] Furthermore, based on the data in Table 1, the maximum real-time flow Q is determined. max Minimum real-time traffic Q min Maximum real-time head H max Minimum real-time head H min Maximum real-time noise S max and minimum real-time noise S min .

[0056] The preset traffic is determined based on real-time traffic, maximum real-time traffic, and minimum real-time traffic, i.e., according to the formula. Determine the preset flow rate. In one embodiment, Q... 实时 for , for , for Then in The preset flow rate is Thus, the preset flow rate under each real-time flow rate in Table 1 can be calculated, as shown in Table 2.

[0057] The preset head is determined based on the real-time head, maximum real-time head, and minimum real-time head, i.e., according to the formula. Determine the preset head. In one embodiment, H 实时 for , for , for Then in The preset head is Thus, the preset head under each real-time head in Table 1 can be calculated, as shown in Table 2.

[0058] The preset noise is determined based on the real-time noise, maximum real-time noise, and minimum real-time noise, i.e., according to the formula. In one embodiment, S determines a preset noise level. 实时 for , for , for Then in The preset noise is Thus, the preset noise under each real-time noise level in Table 1 can be calculated, as shown in Table 2.

[0059] Table 2. Data on preset flow rate, preset head, and preset noise under different preset output frequencies and preset output voltages.

[0060]

[0061] Furthermore, based on the preset flow rate, preset head, and preset noise, a preset comprehensive performance evaluation value is determined, i.e., according to the formula... Among them, the proportion of the target flow rate is α, 0 < α < 1; the proportion of the target head is β, 0 < β < 1; and the proportion of the target noise is γ, 0 < γ < 1. In actual ship operation, α, β, and γ can be determined based on the target flow rate, target head, and target noise of the variable frequency pump. This allows for the determination of the preset comprehensive performance evaluation value under the condition of a fixed preset output voltage and preset output frequency, as shown in Table 3.

[0062] Table 3. Data table of preset target comprehensive values ​​under different preset output frequencies and preset output voltages.

[0063]

[0064] Given a fixed α, β, and γ, the maximum value among multiple preset comprehensive performance evaluation values ​​is determined as the target comprehensive performance evaluation value.

[0065] In actual operation, users can determine the weighting of the target flow rate (α), target head (β), and target noise (γ) based on the actual operating conditions, the target flow rate of the variable frequency pump, the target head, and the target noise level. For example, when performing an emergency mission requiring full-speed navigation, the primary consideration is increasing the target flow rate, resulting in a target flow rate weighting of α of 0.6, a target head weighting of β of 0.2, and a target noise weighting of γ of 0.2. In emergency situations such as pipeline leaks, the primary consideration is increasing the target head, resulting in a target flow rate weighting of α of 0.2, a target head weighting of β of 0.6, and a target noise weighting of γ of 0.2. When navigating through a protected quiet navigation area, the primary consideration is reducing the target noise, resulting in a target flow rate weighting of α of 0.2, a target head weighting of β of 0.2, and a target noise weighting of γ of 0.6. It should be noted that the above are just examples and α, β and γ are not specifically limited. If we consider the increase of target flow rate and target head, and the reduction of noise at the same time, then the proportion of target flow rate α is 0.34, the proportion of target head β is 0.33 and the proportion of target noise γ is 0.33.

[0066] Given a fixed proportion of target flow rate α, a fixed proportion of target head β, and a fixed proportion of target noise γ, according to Calculate and obtain the preset comprehensive performance evaluation values ​​under different preset output frequencies and preset output voltages in Table 3, and determine the maximum value among the preset comprehensive performance evaluation values ​​as the target comprehensive performance evaluation value. At this time, the preset output frequency corresponding to the target comprehensive performance evaluation value is the target output frequency, and the preset output voltage is the target output voltage. Control the variable frequency pump to run at the target output voltage and target output frequency.

[0067] The ship variable frequency pump control method provided in this embodiment of the invention determines the target comprehensive performance evaluation value based on the ship's real-time operating conditions, target flow rate, target head, and target noise, thereby determining the target output voltage and target output frequency, and controlling the variable frequency pump to operate at the target output voltage and target output frequency to meet the comprehensive requirements for the target flow rate, target head, and target noise of the variable frequency pump.

[0068] like Figure 2 As shown in the illustration, this embodiment of the invention also provides a ship, including a variable frequency pump 1, a variable frequency controller 2, and a control device. The variable frequency pump 1 is electrically connected to the variable frequency controller 2 and is used to regulate the operation of the variable frequency pump 1. The variable frequency controller 2 is communicatively connected to the control device, such as through an electrical connection or a wireless connection. Based on relevant data, the control device controls the variable frequency controller 2 to regulate the operation of the variable frequency pump 1.

[0069] Furthermore, the vessel also includes a flow sensor 3, a pressure sensor 4, and a hydrophone 5. All three sensors are located at the outlet of the variable frequency pump 1. The flow sensor 3 is used to acquire the flow rate at the outlet of the variable frequency pump 1. The flow sensor 3 is communicatively connected to the control device and can transmit the acquired flow rate data to the control device. The pressure sensor 4 is used to acquire the pressure at the outlet of the variable frequency pump 1. The pressure sensor 4 is communicatively connected to the control device and can transmit the acquired pressure information to the control device. The hydrophone 5 is used to acquire the noise at the outlet of the variable frequency pump 1. The hydrophone 5 is communicatively connected to the control device and can transmit the acquired noise information to the control device. Based on the analysis of various data, the control device determines the target output voltage and target output frequency of the variable frequency pump 1 and controls the variable frequency controller 2 to operate the variable frequency pump 1 at the target output voltage and target output frequency.

[0070] 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 controlling a ship's variable frequency pump, characterized in that, include: Determine the target flow rate, target head, and target noise level of the variable frequency pump; Based on the target flow rate, the target head, and the target noise, determine the target comprehensive performance evaluation value; Based on the target comprehensive performance evaluation value, the target output voltage and target output frequency of the variable frequency pump are determined; The variable frequency pump is controlled to operate at the target output voltage and the target output frequency; Based on the target flow rate, the target head, and the target noise, a comprehensive performance evaluation value for the target is determined, including: Based on the target flow rate, the target head, and the target noise, determine the proportion of the target flow rate, the proportion of the target head, and the proportion of the target noise; Based on the relationship between preset output voltage, preset output frequency, preset flow rate, preset head, preset noise, the proportion of the target flow rate, the proportion of the target head, and the proportion of the target noise, a preset comprehensive performance evaluation value is determined. The maximum value among the multiple preset comprehensive performance evaluation values ​​is determined as the target comprehensive performance evaluation value; Based on the relationship between preset output voltage, preset output frequency, preset flow rate, preset head, preset noise, the proportion of the target flow rate, the proportion of the target head, and the proportion of the target noise, a preset comprehensive performance evaluation value is determined, including: Determine the preset flow rate, the preset head, and the preset noise level; The preset comprehensive performance evaluation value is determined according to the following formula; ； ； The preset comprehensive performance evaluation value is μ; the preset flow rate is Q. 预设 The preset head is H. 预设 The preset noise level is S. 预设 The weight of the target flow rate is α, 0 < α < 1; the weight of the target head is β, 0 < β < 1; the weight of the target noise is γ, 0 < γ < 1.

2. The ship variable frequency pump control method according to claim 1, characterized in that, Determining the preset flow rate, the preset head, and the preset noise level includes: Given a fixed preset output voltage, determine the real-time flow rate, real-time head, and real-time noise at multiple preset output frequencies; given a fixed preset output frequency, determine the real-time flow rate, real-time head, and real-time noise at multiple preset output voltages. Determine the maximum real-time flow rate, minimum real-time flow rate, maximum real-time head, minimum real-time head, maximum real-time noise, and minimum real-time noise. The preset flow rate is determined based on the real-time flow rate, the maximum real-time flow rate, and the minimum real-time flow rate; the preset head is determined based on the real-time head, the maximum real-time head, and the minimum real-time head; and the preset noise is determined based on the real-time noise, the maximum real-time noise, and the minimum real-time noise.

3. The ship variable frequency pump control method according to claim 2, characterized in that, Determining the preset traffic based on the real-time traffic, the maximum real-time traffic, and the minimum real-time traffic includes: ； Q 实时 For the real-time traffic, Q max For the maximum real-time traffic, Q min This refers to the minimum real-time traffic.

4. The ship variable frequency pump control method according to claim 2, characterized in that, Determining the preset head based on the real-time head, the maximum real-time head, and the minimum real-time head includes: ； H 实时 For the real-time head, H max For the maximum real-time head, H min The minimum real-time head is given.

5. The ship variable frequency pump control method according to claim 2, characterized in that, The preset noise is determined based on the real-time noise, the maximum real-time noise, and the minimum real-time noise; including: ； S 实时 For real-time traffic, S max For maximum flow, S min Minimum flow rate.

6. The ship variable frequency pump control method according to claim 2, characterized in that, With a fixed preset output voltage, determine the real-time flow rate, real-time head, and real-time noise at multiple preset output frequencies; Given a fixed preset output frequency, determine the real-time flow rate, real-time head, and real-time noise at multiple preset output voltages; including: Given that the preset output voltage and the preset output frequency are constant, multiple current flow rates, multiple current head, and multiple current noise levels are obtained within a preset time period. The average of multiple current flow rates is determined as the real-time flow rate; the average of multiple current head rates is determined as the real-time head; and the average of multiple current noise rates is determined as the real-time noise.

7. A vessel for executing the vessel variable frequency pump control method as described in any one of claims 1 to 6, characterized in that, It includes a variable frequency pump, a variable frequency controller, and a control device. The variable frequency controller is electrically connected to the variable frequency pump, and the variable frequency controller is communicatively connected to the control device.

8. The ship according to claim 7, characterized in that, It also includes a flow sensor, a pressure sensor, and a hydrophone. The flow sensor, the pressure sensor, and the hydrophone are all located at the outlet of the variable frequency pump. The flow sensor is used to obtain the flow rate at the outlet of the variable frequency pump, the pressure sensor is used to obtain the pressure at the outlet of the variable frequency pump, and the hydrophone is used to obtain the noise at the outlet of the variable frequency pump. The flow sensor, the pressure sensor, and the hydrophone are all communicatively connected to the control device.

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