Vibration damping performance prediction method, system and equipment of condensate pump vibration damper and medium

Abstract

The invention relates to a vibration damping performance prediction method, system and device for a condensate pump vibration damper and a medium, and the method comprises the steps that firstly, the vibration damper is designed according to actual working condition parameters of a condensate pump; the condensate pump can be damped according to the designed damper. And then, according to the kinetic model of the condensate pump system after the shock absorber is additionally installed, the kinetic relationship between the shock absorber and the condensate pump is obtained. Then, on the basis of the dynamic relation, according to the vibration response relation of the condensate pump and the shock absorber under unbalanced force excitation, a target condensate pump frequency response function after the shock absorber is additionally installed is obtained; and finally, on the basis of the target condensate pump frequency response function, according to the condensate pump vibration response amplitude before the shock absorber is additionally installed, the shock absorption performance of the condensate pump shock absorber is predicted. Accurate prediction of the vibration damping performance of the condensate pump vibration damper is realized, and the problem of low prediction accuracy of the vibration damping performance of the condensate pump vibration damper in the prior art is solved.

Description

Technical Field

[0001] The present application relates to the technical field of shock absorber performance prediction, and particularly to a method, system, equipment and medium for predicting the shock absorption performance of a condensate pump shock absorber. Background Technique

[0002] The condensate pump refers to the condensate pump in a power plant, which is arranged vertically. The driving motor is at the uppermost end of the condensate pump and is heavy, making it prone to unstable vibration. When the condensate pump operates with frequency conversion within a certain load range, it just falls into the resonance area, resulting in large vibration and affecting the safe operation of the vertical condensate pump.

[0003] Installing a shock absorber on the condensate pump can transfer the vibration of the condensate pump into a large reverse movement of the mass block in the shock absorber through the principle of dynamic vibration absorption, thereby dissipating the excitation energy of the condensate pump and reducing the vibration of the condensate pump.

[0004] Currently, when predicting the performance of a shock absorber, it is often predicted based on the mass, stiffness and damping coefficient of the shock absorber. However, when predicting the shock absorption performance of a condensate pump shock absorber in this way, there is a problem of low prediction accuracy. Summary of the Invention

[0005] Embodiments of the present application provide a method, system, equipment and medium for predicting the shock absorption performance of a condensate pump shock absorber, so as to at least solve the problem of low prediction accuracy of the shock absorption performance of a condensate pump shock absorber in related technologies.

[0006] In a first aspect, embodiments of the present application provide a method for predicting the shock absorption performance of a condensate pump shock absorber, and the method includes:

[0007] Obtain the dynamic relationship between the shock absorber and the condensate pump according to the dynamic model of the condensate pump system after installing the shock absorber;

[0008] Based on the dynamic relationship, obtain the frequency response function of the target condensate pump after installing the shock absorber according to the vibration response relationship between the condensate pump and the shock absorber under the excitation of the unbalanced force;

[0009] Based on the frequency response function of the target condensate pump, predict the shock absorption performance of the condensate pump shock absorber according to the vibration response amplitude of the condensate pump before installing the shock absorber.

[0010] In an embodiment, the design of the shock absorber according to the actual working condition parameters of the condensate pump includes:

[0011] Obtain the participating mass and vibration frequency points of the condensate pump;

[0012] Obtain the mass of the shock absorber according to the mass ratio of the participating mass of the condensate pump to the mass of the shock absorber;

[0013] Obtain the shock absorber stiffness coefficient based on the shock absorber mass, the vibration frequency point, and the mass ratio;

[0014] Obtain the shock absorber damping coefficient based on the shock absorber mass, the vibration frequency point, and the mass ratio;

[0015] Design a shock absorber based on the shock absorber mass, the shock absorber stiffness coefficient, and the shock absorber damping coefficient.

[0016] In one embodiment, the condensate pump system dynamic model is used to analyze the dynamic characteristics of the shock absorber and the condensate pump; according to the condensate pump system dynamic model after installing the shock absorber, obtain the dynamic relationship between the shock absorber and the condensate pump, which is expressed by the following formula:

[0017] m2x2 + c2x2 + k2x2 = c2x1 + k2x1

[0018] m1x1 + (c1 + c2)x1 + (k1 + k2)x1 = f(t) + c2x2 + k2x2

[0019] In the formula, m1 represents the mass of the condensate pump participating in vibration, m2 represents the mass of the shock absorber, k1 represents the stiffness coefficient of the condensate pump, k2 represents the stiffness coefficient of the shock absorber, c1 represents the damping coefficient of the condensate pump, c2 represents the damping coefficient of the shock absorber, and f(t) represents the excitation force

[0020] In one embodiment, the vibration response relationship between the condensate pump and the shock absorber under the excitation of the unbalanced force is expressed by the following formula:

[0021] x1(t) = X1e iωt , x2(t) = X2e iωt , f(t) = Fe iωt

[0022] In the formula, x1 represents the vibration of the condensate pump, x2 represents the vibration of the shock absorber, f(t) represents the excitation force, X1 predicts the vibration response amplitude of the condensate pump after installing the shock absorber, X2 represents the vibration response amplitude of the shock absorber, F represents the amplitude of the external excitation force, and ω represents the excitation force frequency.

[0023] In one embodiment, based on the dynamic relationship, according to the vibration response relationship between the condensate pump and the shock absorber under the excitation of the unbalanced force, obtain the target condensate pump frequency response function after installing the shock absorber, including:

[0024] According to the cross-power spectrum of the vibration response, the cross-power spectrum of the excitation force, and the auto-power spectrum of the excitation force, respectively obtain the initial condensate pump frequency response function and the shock absorber frequency response function;

[0025] Based on the initial condensate pump frequency response function and the shock absorber frequency response function, according to the dynamic relationship and the vibration response relationship, obtain the target condensate pump frequency response function after installing the shock absorber.

[0026] In one embodiment, the target condensate pump frequency response function is represented by the following formula:

[0027]

[0028] In the formula, H1 represents the initial condensate pump frequency response function, H2 represents the shock absorber frequency response function, H1' represents the condensate pump frequency response function after installing the shock absorber, ω represents the excitation force frequency, and m2 represents the mass of the shock absorber.

[0029] In one embodiment, based on the target condensate pump frequency response function, according to the condensate pump vibration response amplitude before installing the shock absorber, predicting the shock absorption performance of the condensate pump shock absorber includes:

[0030] Predict the shock absorption performance of the condensate pump shock absorber through the following formula:

[0031]

[0032] In the formula, X1 represents the predicted condensate pump vibration response amplitude after installing the shock absorber, H1' represents the condensate pump frequency response function after installing the shock absorber, F represents the amplitude of the external excitation force, H1 represents the initial condensate pump frequency response function, H2 represents the shock absorber frequency response function, represents the condensate pump vibration response amplitude before installing the shock absorber.

[0033] In a second aspect, an embodiment of the present application provides a shock absorption performance prediction system for a condensate pump shock absorber. The system includes: a dynamic relationship module, a target condensate pump frequency response function module, and a prediction module; wherein,

[0034] The dynamic relationship module is used to obtain the dynamic relationship between the shock absorber and the condensate pump according to the dynamic model of the condensate pump system after installing the shock absorber;

[0035] The target condensate pump frequency response function module is used to obtain the target condensate pump frequency response function after installing the shock absorber based on the dynamic relationship and according to the vibration response relationship between the condensate pump and the shock absorber under the excitation of the unbalanced force;

[0036] The prediction module is used to predict the shock absorption performance of the condensate pump shock absorber based on the target condensate pump frequency response function and according to the condensate pump vibration response amplitude before installing the shock absorber.

[0037] In a third aspect, an embodiment of the present application provides a computer device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, it implements a method for predicting the vibration reduction performance of a condensate pump shock absorber as described in the first aspect above.

[0038] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, it implements a method for predicting the vibration reduction performance of a condensate pump shock absorber as described in the first aspect above.

[0039] The method, system, equipment, and medium for predicting the vibration reduction performance of a condensate pump shock absorber provided by the embodiments of the present application at least have the following technical effects.

[0040] First, design a shock absorber according to the actual working condition parameters of the condensate pump. The condensate pump can be vibration-reduced according to the designed shock absorber. Subsequently, obtain the dynamic relationship between the shock absorber and the condensate pump based on the dynamic model of the condensate pump system after installing the shock absorber. Then, based on the dynamic relationship, obtain the frequency response function of the target condensate pump after installing the shock absorber according to the vibration response relationship between the condensate pump and the shock absorber under the excitation of the unbalanced force. Finally, based on the frequency response function of the target condensate pump, predict the vibration reduction performance of the condensate pump shock absorber according to the vibration response amplitude of the condensate pump before installing the shock absorber. The accurate prediction of the vibration reduction performance of the condensate pump shock absorber is realized, and the problem of low accuracy in predicting the vibration reduction performance of the condensate pump shock absorber in the related technology is solved.

[0041] The details of one or more embodiments of the present application are set forth in the following drawings and description to make the other features, objects, and advantages of the present application more comprehensible. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The illustrative embodiments and descriptions thereof are used to explain the present application and do not constitute an improper limitation of the present application. In the drawings:

[0043] Figure 1 is a flowchart of a method for predicting the vibration reduction performance of a condensate pump shock absorber;

[0044] Figure 2 is a schematic structural diagram of condensate pump vibration reduction analysis shown in an exemplary embodiment;

[0045] Figure 3 is a schematic structural diagram of a vertical condensate pump test bench shown in an exemplary embodiment;

[0046] Figure 4 is a schematic diagram of a test-measured condensate pump frequency response function curve shown in an exemplary embodiment;

[0047] Figure 5 It is a schematic diagram of the frequency response function curve of a shock absorber shown according to an exemplary embodiment;

[0048] Figure 6 It is a schematic diagram of the frequency response function of a condensate pump before and after installing a shock absorber shown according to an exemplary embodiment;

[0049] Figure 7 It is a block diagram of the structure of a shock absorption performance prediction system for a condensate pump shock absorber shown according to an exemplary embodiment;

[0050] Figure 8 It is a block diagram of the structure of an electronic device shown according to an exemplary embodiment. Detailed implementation manners

[0051] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be described and explained below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0052] Obviously, the accompanying drawings in the following description are only some examples or embodiments of the present application. For those of ordinary skill in the art, without creative efforts, the present application can also be applied to other similar scenarios based on these drawings. In addition, it can also be understood that although the efforts made in this development process may be complex and lengthy, for those of ordinary skill in the art related to the content disclosed in the present application, some design, manufacturing or production changes made based on the technical content disclosed in the present application are only conventional technical means and should not be understood as the content disclosed in the present application being insufficient.

[0053] Referring to "embodiment" in the present application means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those of ordinary skill in the art explicitly and implicitly understand that the embodiments described in the present application can be combined with other embodiments without conflict.

[0054] Unless otherwise defined, the technical terms or scientific terms involved in this application shall have the ordinary meanings understood by those with ordinary skills in the technical field to which this application belongs. The words such as "a", "an", "one kind", "the" and the like involved in this application do not indicate a quantity limitation and may represent a singular or plural number. The terms "comprise", "include", "have" and any variations thereof involved in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may further include unlisted steps or units, or may further include other steps or units inherent to these processes, methods, products or devices. The words such as "connect", "be connected", "couple" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "plurality" involved in this application means two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships may exist. For example, "A and / or B" may represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the front and rear associated objects. The terms "first", "second", "third" and the like involved in this application are only used to distinguish similar objects and do not represent a specific order for the objects.

[0055] Currently, in order to reduce the vibration of condensate pumps, common measures include: (1) increasing the support stiffness, such as adding stiffeners or brackets to parts such as motors and cylinders. This method can reduce vibration to a certain extent, but the vibration reduction effect is limited; (2) improving the dynamic balance accuracy and reducing the exciting force. When many condensate pumps carry out dynamic balance tests, it is found that there are contradictions in the vibrations in the east-west and north-south directions, and it is difficult to reduce the vibrations in both directions through dynamic balance tests; (3) adjusting the perpendicularity and alignment deviation of the axis of vertical condensate pumps, etc. This method needs to be carried out in combination with the overhaul of condensate pumps, with a large workload, and the vibration reduction effect is also limited, and it varies depending on the unit conditions.

[0056] Installing a shock absorber at the upper end of the drive motor of the condensate pump, and transferring the vibration of the condensate pump into a large reverse movement of the mass block in the shock absorber through the principle of dynamic vibration absorption, so as to dissipate the exciting energy of the condensate pump, can reduce the vibration of the condensate pump.

[0057] Existing predictions of shock absorber performance often predict through the mass, stiffness and damping coefficient of the shock absorber. However, when carried out in this way, there are the following problems:

[0058] (1) The condensate pump is a system composed of a motor rotor, a motor stator, a pump shaft, an impeller, a pump casing, a cylinder, a pipeline, additional water in the pump, etc., and the participating mass is difficult to accurately estimate.

[0059] (2) Damping has a great influence on the performance of the shock absorber. The test error of the shock absorber damping coefficient is large, and the performance of the designed shock absorber is quite different from the expected one.

[0060] (3) Due to the test errors of the vibration mass of the condensing pump, the stiffness of the shock absorber, and the damping coefficient, the actual vibration reduction effect deviates greatly from the design value.

[0061] Therefore, due to the large deviation between the actual vibration reduction effect and the target vibration reduction effect after the vibration absorber and the condensate pump are installed, there is a problem of low prediction accuracy. After the vibration absorber and the condensate pump are installed, the vibration absorber needs to be repeatedly installed and disassembled to debug the vibration reduction performance. Therefore, it is urgent to improve the prediction accuracy of the vibration reduction performance of the condensate pump vibration absorber to reduce the number of vibration absorber debugging.

[0062] Based on the above situation, the embodiment of the present application provides a method, system, equipment and medium for predicting the vibration reduction performance of a condensing pump shock absorber, which predicts the vibration of the condensing pump after the shock absorber is installed based on the frequency response function of the condensing pump and the shock absorber subsystem, the mass of the shock absorber and the original vibration of the condensing pump, and provides a new method for evaluating the vibration reduction effect of the condensing pump shock absorber. The mass of the shock absorber and the original vibration used in the prediction model can be measured, and the frequency response function of the condensing pump and the shock absorber subsystem can be obtained through a hammer test under actual conditions. The test error of the above parameters is small, and the prediction model has high accuracy.

[0063] In a first aspect, an embodiment of the present application provides a method for predicting the vibration reduction performance of a condensing pump vibration reducer. Figure 1 It is a flow chart of a method for predicting the vibration reduction performance of a condensing pump vibration reducer. Figure 1 As shown, the method includes:

[0064] Step S101 : obtaining a dynamic relationship between the shock absorber and the condensate pump according to a dynamic model of the condensate pump system after the shock absorber is installed.

[0065] Step S102: Based on the dynamic relationship and the vibration response relationship between the condensing pump and the shock absorber under the excitation of the unbalanced force, a target condensing pump frequency response function after the shock absorber is installed is obtained.

[0066] Step S103: Based on the target condensing pump frequency response function and the vibration response amplitude of the condensing pump before the vibration absorber is installed, predict the vibration reduction performance of the condensing pump vibration absorber.

[0067] In summary, the embodiment of the present application provides a method for predicting the vibration reduction performance of a condensate pump shock absorber. First, according to the actual working condition parameters of the condensate pump, a shock absorber is designed. The condensate pump can be vibration-reduced according to the designed shock absorber. Subsequently, according to the dynamic model of the condensate pump system after installing the shock absorber, the dynamic relationship between the shock absorber and the condensate pump is obtained. Immediately afterwards, based on the dynamic relationship, according to the vibration response relationship between the condensate pump and the shock absorber under the excitation of the unbalanced force, the frequency response function of the target condensate pump after installing the shock absorber is obtained. Finally, based on the frequency response function of the target condensate pump, according to the vibration response amplitude of the condensate pump before installing the shock absorber, the vibration reduction performance of the condensate pump shock absorber is predicted. The accurate prediction of the vibration reduction performance of the condensate pump shock absorber is realized, and the problem of low accuracy in predicting the vibration reduction performance of the condensate pump shock absorber in the related technology is solved.

[0068] In one embodiment, before step S101, according to the dynamic model of the condensate pump system after installing the shock absorber, obtaining the dynamic relationship between the shock absorber and the condensate pump, the method for predicting the vibration reduction performance of the condensate pump shock absorber further includes:

[0069] Obtain the participating mass and vibration frequency points of the condensate pump;

[0070] According to the mass ratio of the participating mass of the condensate pump to the mass of the shock absorber, obtain the mass of the shock absorber;

[0071] Based on the mass of the shock absorber, vibration frequency points and mass ratio, obtain the stiffness coefficient of the shock absorber;

[0072] Based on the mass of the shock absorber, vibration frequency points and mass ratio, obtain the damping coefficient of the shock absorber;

[0073] Based on the mass of the shock absorber, the stiffness coefficient of the shock absorber and the damping coefficient of the shock absorber, design the shock absorber.

[0074] Optionally, Figure 2 is a structural schematic diagram of condensate pump vibration reduction analysis shown in an exemplary embodiment, as Figure 2 shown, the condensate pump is the vibration reduction object, including the participating mass m1, stiffness coefficient k1 and damping coefficient c1 of the condensate pump. It vibrates under the excitation of external forces such as unbalance. The shock absorber is located above the condensate pump, including the mass m2, stiffness coefficient k2 and damping coefficient c2 of the shock absorber.

[0075] Furthermore, given the participating mass m1 of the condensate pump and the vibration frequency point ω n1 , according to the dynamic vibration absorption theory, the shock absorber is designed through formula (1):

[0076] m2 = μm1

[0077]

[0078] In the formula, μ is the mass ratio, which can be taken as 1% - 5% in this example, ω n1It is the vibration damping frequency point of the condensate pump.

[0079] Those skilled in the art can understand that after installing the shock absorber, the mass block in the dynamic vibration absorber vibrates violently near the specified frequency point, and the vibration of the condensate pump is transmitted to the dynamic vibration absorber, thereby reducing the vibration of the condensate pump. By the mass of the shock absorber, the stiffness coefficient of the shock absorber and the damping coefficient of the shock absorber, the shock absorber is designed to facilitate the subsequent prediction of the shock absorption performance of the shock absorber, and after knowing the prediction result, the parameters of the shock absorber are adjusted to achieve the expected shock absorption effect.

[0080] In one embodiment, step S101: According to the dynamic model of the condensate pump system after installing the shock absorber, obtain the dynamic relationship between the shock absorber and the condensate pump. Specifically, it includes:

[0081] The dynamic model of the condensate pump system is used to analyze the dynamic characteristics of the shock absorber and the condensate pump; according to the dynamic model of the condensate pump system after installing the shock absorber, the dynamic relationship between the shock absorber and the condensate pump is obtained, which is expressed by formula (2):

[0082]

[0083] In the formula, m1 represents the participating mass of the condensate pump, m2 represents the mass of the shock absorber, k1 represents the stiffness coefficient of the condensate pump, k2 represents the stiffness coefficient of the shock absorber, c1 represents the damping coefficient of the condensate pump, c2 represents the damping coefficient of the shock absorber, and f(t) represents the excitation force.

[0084] Optionally, the introduction of the shock absorber can reduce the vibration amplitude of the condensate pump system. By adjusting the stiffness and damping coefficients of the shock absorber, the resonance phenomenon of the condensate pump at a specific frequency can be effectively suppressed.

[0085] In one embodiment, step S102: Based on the dynamic relationship, according to the vibration response relationship between the condensate pump and the shock absorber under the excitation of the unbalanced force, obtain the frequency response function of the target condensate pump after installing the shock absorber. Specifically, it includes:

[0086] According to the cross-power spectrum of the vibration response, the cross-power spectrum of the excitation force and the auto-power spectrum of the excitation force, respectively obtain the initial frequency response function of the condensate pump and the frequency response function of the shock absorber;

[0087] Based on the initial frequency response function of the condensate pump and the frequency response function of the shock absorber, according to the dynamic relationship and the vibration response relationship, obtain the frequency response function of the target condensate pump after installing the shock absorber.

[0088] Optionally, apply a hammer impact excitation to the test object, measure the pulse excitation force, measure the vibration response under the pulse excitation with a vibration sensor, and calculate the frequency response function according to formula (3):

[0089]

[0090] In the formula: Gfx (ω) is the cross-power spectrum of the vibration response and the excitation force; G ff (ω) is the auto-power spectrum of the excitation force.

[0091] Specifically, an impact excitation force is applied to the motor by a force hammer, sensors are arranged at the upper bearing of the motor to measure the vibration response, and the initial condensate pump frequency response function H1 is obtained through formula (3). Sensors are arranged in the internal mass unit of the shock absorber, an impact excitation force is applied to the mass unit to measure the vibration response, and the shock absorber frequency response function H2 is obtained.

[0092] The frequency response functions of the initial condensate pump and the shock absorber can be obtained through the hammering method test under the actual condition, and the measurement errors of the above parameters are small, which improves the prediction accuracy of the shock absorption performance.

[0093] Furthermore, the vibration response relationship between the condensate pump and the shock absorber under the excitation of the unbalanced force is expressed by formula (4). Under the excitation of the unbalanced force, let:

[0094] x1(t) = X1e iωt , x2(t) = X2e iωt , f(t) = Fe iωt (4)

[0095] In the formula, x1 represents the vibration of the condensate pump, x2 represents the vibration of the shock absorber, f(t) represents the excitation force, X1 predicts the vibration response amplitude of the condensate pump after installing the shock absorber, X2 represents the vibration response amplitude of the shock absorber, F represents the amplitude of the external excitation force, and ω represents the excitation force frequency.

[0096] Substitute formula (4) into formula (2), and make the amplitudes of the corresponding harmonic components equal, we can get:

[0097] -ω 2 m2X2 + iωc2X2 + k2X2 = iωc2X1 + k2X1

[0098] -ω 2 m1X1 + iω(c1 + c2)X1 + (k1 + k2)X1 = F + iωc2X2 + k2X2 (5)

[0099] According to the physical meaning of the frequency response function, it can be known that:

[0100]

[0101] Formula 5 contains two unknowns X1 and X2. X1 predicts the vibration response amplitude of the condensate pump after installing the shock absorber, and X2 represents the vibration response amplitude of the shock absorber. According to X1, H1, and H2 in formula (6), solve formula (5), and we can get:

[0102]

[0103] In the formula, H1 represents the initial condensate pump frequency response function, H2 represents the shock absorber frequency response function, H1' represents the condensate pump frequency response function after installing the shock absorber, ω represents the excitation force frequency, and m2 represents the mass of the shock absorber.

[0104] It should be noted that H1 and H2 in formula (7) are for deriving H1'. When calculating H1', H1 and H2 are calculated through formula (3). In the calculation formula of the condensate pump frequency response function H1' after installing the shock absorber, the parameters of H1, H2, ω, and m2 are obtained according to on-site actual tests or are given and known. Therefore, the error of the calculated condensate pump frequency response function after installing the shock absorber is small, thereby improving the prediction accuracy of the vibration reduction performance of the condensate pump shock absorber. This solves the problem that the vibration reduction effect is not as expected after the shock absorber is installed on-site and needs to be disassembled and returned to the factory for secondary processing and adjustment.

[0105] In one embodiment, step S103: Based on the target condensate pump frequency response function, predict the vibration reduction performance of the condensate pump shock absorber according to the vibration response amplitude of the condensate pump before installing the shock absorber. Through the formula: Predict the vibration reduction performance of the condensate pump shock absorber. Wherein, X1 represents the predicted vibration response amplitude of the condensate pump after installing the shock absorber, H1' represents the condensate pump frequency response function after installing the shock absorber, F represents the amplitude of the external excitation force, H1 represents the initial condensate pump frequency response function, and H2 represents the shock absorber frequency response function. represents the vibration response amplitude of the condensate pump before installing the shock absorber.

[0106] Through step S103, based on the target condensate pump frequency response function, predict the vibration reduction performance of the condensate pump shock absorber according to the vibration response amplitude of the condensate pump before installing the shock absorber. The accurate prediction of the vibration reduction performance of the condensate pump shock absorber is realized, the problem of low prediction accuracy of the vibration reduction performance of the condensate pump shock absorber in the related technology is solved, and the prediction accuracy of the vibration reduction performance is improved.

[0107] The following further illustrates the present application in combination with actual applications:

[0108] Figure 3 is a schematic structural diagram of a vertical condensate pump test bench shown according to an exemplary embodiment. As Figure 3 shown, the conical shell of the test bench simulates the condensate pump support cylinder, and the motor is located above the conical shell. The condensate pump shafting is radially supported by three bearings and is connected to the motor shaft through an elastic coupling. An installation ring is designed at the top of the test bench motor to install a dynamic vibration absorber. The participating vibration mass of the condensate pump system is estimated to be 19.35 kg by the mass induction method. Taking the mass ratio μ = 1.5%, the mass of the shock absorber m2 = 290 g is obtained, and the shock absorber is designed according to formula (1).

[0109] Step 1: Frequency response function calculation: Apply a hammer impact excitation to the test object, measure the pulse excitation force, measure the vibration response under the pulse excitation using a vibration sensor, and calculate the frequency response function according to formula (3).

[0110] Step 2: Initial condensate pump frequency response function test: Apply an impact excitation force to the motor through a force hammer, arrange sensors at the upper bearing of the motor to measure the vibration response, and obtain the condensate pump frequency response function H1. Figure 4 is a schematic diagram showing the experimentally measured frequency response function curve of the condensate pump according to an exemplary embodiment, as Figure 4 shown, the resonance frequency of the condensate pump test bench is 26.3 Hz, and the vibration reduction design is carried out for the frequency range [20, 28].

[0111] Step 3: Vibration damper frequency response function test: Figure 5 is a schematic diagram showing the frequency response function curve of the vibration damper according to an exemplary embodiment, as Figure 5 shown, arrange sensors in the internal mass unit of the vibration damper, apply an impact excitation force to the mass unit, and obtain the vibration damper frequency response function H2.

[0112] Step 4: Calculate the frequency response function of the condensate pump after installing the vibration damper: Figure 6 is a schematic diagram showing the frequency response function of the condensate pump before and after installing the vibration damper according to an exemplary embodiment, as Figure 6 shown, according to the mass of the vibration damper, the initial condensate pump frequency response function H1, and the vibration damper frequency response function H2, calculate the frequency response function H1' of the condensate pump after installing the vibration damper. Figure 6 gives the frequency response function H1' of the condensate pump after installing the vibration damper calculated based on the experimentally measured frequency response functions of these 2 tests and the mass of the vibration damper. After installing the vibration damper, the response of the condensate pump near the resonance frequency of 26.3 Hz decreases, and the vibration under the same external force excitation is smaller.

[0113] Step 5: Calculate the vibration of the condensate pump after installing the vibration damper: According to the formula calculate the vibration parameters of the condensate pump after installing the vibration damper. In the formula, is the vibration response amplitude of the condensate pump before installing the vibration damper.

[0114] Step 6: According to the calculation results, determine the vibration reduction performance of the vibration damper at different frequency points based on the vibration before installing the vibration damper and the vibration after installing the vibration damper.

[0115] In summary, the present application proposes a vibration prediction method for a condensate pump - shock absorber coupling system based on the experimental frequency response function: an vibration analysis model (Equation 7) is established according to the frequency response functions of the condensate pump and the shock absorber and the mass of the shock absorber to predict the vibration of the condensate pump after installing the shock absorber, and the parameters of the shock absorber are debugged and optimized before installing the shock absorber on the condensate pump to improve the shock absorption capacity of the shock absorber. The frequency response functions of the condensate pump and the shock absorber used in the prediction model can be measured experimentally, and the mass of the shock absorber can be accurately obtained, so the established prediction model has a high accuracy.

[0116] Specifically, first, a shock absorber is designed according to the actual working condition parameters of the condensate pump. The condensate pump can be shock - absorbed according to the designed shock absorber. Subsequently, based on the dynamic model of the condensate pump system after installing the shock absorber, the dynamic relationship between the shock absorber and the condensate pump is obtained. Immediately afterwards, based on the dynamic relationship, according to the vibration response relationship between the condensate pump and the shock absorber under the excitation of the unbalanced force, the frequency response function of the target condensate pump after installing the shock absorber is obtained. Finally, based on the frequency response function of the target condensate pump and according to the vibration response amplitude of the condensate pump before installing the shock absorber, the shock absorption performance of the condensate pump shock absorber is predicted. The accurate prediction of the shock absorption performance of the condensate pump shock absorber is realized, and the problem of low prediction accuracy of the shock absorption performance of the condensate pump shock absorber in the related technology is solved.

[0117] In the second aspect, the embodiment of the present application provides a shock absorption performance prediction system for a condensate pump shock absorber. Figure 7 It is a structural block diagram of a shock absorption performance prediction system for a condensate pump shock absorber shown according to an exemplary embodiment. As Figure 7 shown, the system includes: a dynamic relationship module 710, a target condensate pump frequency response function module 720, and a prediction module 730; where

[0118] The dynamic relationship module 710 is configured to obtain the dynamic relationship between the shock absorber and the condensate pump according to the dynamic model of the condensate pump system after installing the shock absorber;

[0119] The target condensate pump frequency response function module 720 is configured to obtain the frequency response function of the target condensate pump after installing the shock absorber based on the dynamic relationship and according to the vibration response relationship between the condensate pump and the shock absorber under the excitation of the unbalanced force;

[0120] The prediction module 730 is configured to predict the shock absorption performance of the condensate pump shock absorber based on the frequency response function of the target condensate pump and according to the vibration response amplitude of the condensate pump before installing the shock absorber.

[0121] In summary, the shock absorption performance prediction system for a condensate pump shock absorber provided by the present application realizes the accurate prediction of the shock absorption performance of the condensate pump shock absorber through the dynamic relationship module 710, the target condensate pump frequency response function module 720, and the prediction module 730, and solves the problem of low prediction accuracy of the shock absorption performance of the condensate pump shock absorber in the related technology.

[0122] It should be noted that the vibration damping performance prediction system of a condensate pump shock absorber provided in this embodiment is used to implement the above-mentioned implementation manners, and those that have been described will not be repeated here. As used above, terms such as "module", "unit", "sub-unit", etc. can be a combination of software and / or hardware that can achieve a predetermined function. Although the devices described in the above embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware is also possible and contemplated.

[0123] In a third aspect, an embodiment of the present application provides an electronic device, Figure 8 which is a block diagram of an electronic device shown according to an exemplary embodiment. As Figure 8 shown, the electronic device may include a processor 81 and a memory 82 storing computer program instructions.

[0124] Specifically, the above-mentioned processor 81 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0125] Among them, the memory 82 may include a mass memory for data or instructions. By way of example and not limitation, the memory 82 may include a hard disk drive (HDD), a floppy disk drive, a solid state drive (SSD), a flash memory, an optical disc, a magneto-optical disc, a magnetic tape, or a universal serial bus (USB) drive, or a combination of two or more of these. In appropriate cases, the memory 82 may include removable or non-removable (or fixed) media. In appropriate cases, the memory 82 may be internal or external to the data processing device. In a particular embodiment, the memory 82 is non-volatile memory. In a particular embodiment, the memory 82 includes a read-only memory (ROM) and a random access memory (RAM). In appropriate cases, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically alterable read-only memory (EAROM), or a flash memory, or a combination of two or more of these. In appropriate cases, the RAM may be a static random access memory (SRAM) or a dynamic random access memory (DRAM), where the DRAM may be a fast page mode dynamic random access memory (FPMDRAM), an extended date out dynamic random access memory (EDODRAM), a synchronous dynamic random access memory (SDRAM), etc.

[0126] The memory 82 can be used to store or cache various data files required for processing and / or communication, as well as possible computer program instructions executed by the processor 81.

[0127] The processor 81 reads and executes the computer program instructions stored in the memory 82 to implement the vibration damping performance prediction method of any one of the condensate pump dampers in the above embodiments.

[0128] In one embodiment, a vibration damping performance prediction device for a condensate pump damper may further include a communication interface 83 and a bus 80. Among them, as Figure 8 shown, the processor 81, the memory 82, and the communication interface 83 are connected through the bus 80 to complete communication with each other.

[0129] The communication interface 83 is used to implement communication between the modules, devices, units, and / or devices in the embodiments of the present application. The communication port 83 can also implement data communication with other components, such as external devices, image / data acquisition devices, databases, external storage, and image / data processing workstations.

[0130] The bus 80 includes hardware, software, or both, and couples components of a vibration damping performance prediction device for a condensate pump damper together. The bus 80 includes at least one of the following, including but not limited to: Data Bus, Address Bus, Control Bus, Expansion Bus, LocalBus. By way of example and not limitation, the bus 80 may include an Accelerated Graphics Port (AGP) or other graphics bus, an Extended Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an InfiniBand interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local Bus (VLB) bus, or other suitable buses, or a combination of two or more of these. In appropriate cases, the bus 80 may include one or more buses. Although the embodiments of the present application describe and illustrate specific buses, the present application contemplates any suitable bus or interconnect.

[0131] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a program is stored. When the program is executed by a processor, it implements a vibration damping performance prediction method for a condensate pump damper provided in the first aspect.

[0132] Among them, the readable storage medium may more specifically include, but is not limited to: a portable disk, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0133] In a possible implementation, the present invention can also be implemented in the form of a program product, which includes program code. When the program product runs on a terminal device, the program code is used to cause the terminal device to execute the steps of a method for predicting the vibration damping performance of a condensate pump vibration damper provided in the first aspect.

[0134] Among them, the program code for executing the present invention can be written in any combination of one or more programming languages. The program code can be executed entirely on the user device, partially on the user device, executed as an independent software package, partially on the user device and partially on a remote device, or entirely on a remote device.

[0135] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0136] The above-described embodiments merely represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A method for predicting the vibration damping performance of a condensate pump shock absorber, characterized in that, The method includes: Obtaining the dynamic relationship between the shock absorber and the condensate pump according to the dynamic model of the condensate pump system after installing the shock absorber; Based on the dynamic relationship, obtaining the frequency response function of the target condensate pump after installing the shock absorber according to the vibration response relationship between the condensate pump and the shock absorber under the excitation of the unbalanced force; Based on the frequency response function of the target condensate pump, predicting the shock absorption performance of the condensate pump shock absorber according to the vibration response amplitude of the condensate pump before installing the shock absorber.

2. The vibration damping performance prediction method of a condensate pump shock absorber according to claim 1, characterized in that, Based on the dynamic relationship, obtaining the frequency response function of the target condensate pump after installing the shock absorber according to the vibration response relationship between the condensate pump and the shock absorber under the excitation of the unbalanced force, including: Respectively obtaining the initial condensate pump frequency response function and the shock absorber frequency response function according to the cross-power spectrum of the vibration response, the cross-power spectrum of the excitation force, and the auto-power spectrum of the excitation force; Based on the initial condensate pump frequency response function and the shock absorber frequency response function, obtaining the frequency response function of the target condensate pump after installing the shock absorber according to the dynamic relationship and the vibration response relationship.

3. The vibration damping performance prediction method of a condensate pump shock absorber according to claim 2, characterized in that, The frequency response function of the target condensate pump is expressed by the following formula: In the formula, H1 represents the initial condensate pump frequency response function, H2 represents the shock absorber frequency response function, H1' represents the condensate pump frequency response function after installing the shock absorber, ω represents the excitation force frequency, and m2 represents the mass of the shock absorber.

4. A method for predicting the vibration damping performance of a condensate pump shock absorber according to claim 1, characterized in that, The dynamic model of the condensate pump system is used to analyze the dynamic characteristics of the shock absorber and the condensate pump; according to the dynamic model of the condensate pump system after installing the shock absorber, the dynamic relationship between the shock absorber and the condensate pump is obtained, which is expressed by the following formula: m2x2 + c2x2 + k2x2 = c2x1 + k2x1 m1x1 + (c1 + c2)x1 + (k1 + k2)x1 = f(t) + c2x2 + k2x2 In the formula, m1 represents the mass of the condensate pump participating in vibration, m2 represents the mass of the shock absorber, k1 represents the stiffness coefficient of the condensate pump, k2 represents the stiffness coefficient of the shock absorber, c1 represents the damping coefficient of the condensate pump, c2 represents the damping coefficient of the shock absorber, and f(t) represents the excitation force.

5. The vibration damping performance prediction method of a condensate pump shock absorber according to claim 1, characterized in that The vibration response relationship between the condensate pump and the shock absorber under the excitation of the unbalanced force is expressed by the following formula: x1(t) = X1e iωt , x2(t) = X2e iωt , f(t) = Fe iωt In the formula, x1 represents the vibration of the condensate pump, x2 represents the vibration of the shock absorber, f(t) represents the excitation force, X1 predicts the vibration response amplitude of the condensate pump after installing the shock absorber, X2 represents the vibration response amplitude of the shock absorber, F represents the amplitude of the external excitation force, and ω represents the excitation force frequency.

6. The method for predicting the shock absorption performance of a condensate pump shock absorber according to claim 1, characterized in that Predicting the shock absorption performance of the condensate pump shock absorber by the following formula: Wherein, X1 represents the vibration response amplitude of the condensate pump after predicting the installation of the shock absorber, H1' represents the frequency response function of the condensate pump after the installation of the shock absorber, F represents the amplitude of the external excitation force, H1 represents the initial frequency response function of the condensate pump, and H2 represents the frequency response function of the shock absorber. represents the vibration response amplitude of the condensate pump before the installation of the shock absorber.

7. A method for predicting the vibration damping performance of a condensate pump shock absorber according to claim 1, characterized in that, Before obtaining the dynamic relationship between the shock absorber and the condensate pump according to the dynamic model of the condensate pump system after installing the shock absorber, the method further includes: Obtaining the mass of the condensate pump participating in vibration and the vibration frequency points; Obtaining the mass of the shock absorber according to the mass ratio of the mass of the condensate pump participating in vibration to the mass of the shock absorber; Obtaining the stiffness coefficient of the shock absorber based on the mass of the shock absorber, the vibration frequency points, and the mass ratio; Obtaining the damping coefficient of the shock absorber based on the mass of the shock absorber, the vibration frequency points, and the mass ratio; Designing the shock absorber based on the mass of the shock absorber, the stiffness coefficient of the shock absorber, and the damping coefficient of the shock absorber.

8. A vibration damping performance prediction system for a condensate pump shock absorber, characterized in that, The system includes: a dynamic relationship module, a target condensate pump frequency response function module, and a prediction module; wherein, The dynamic relationship module is configured to obtain the dynamic relationship between the shock absorber and the condensate pump according to the dynamic model of the condensate pump system after installing the shock absorber; The target condensate pump frequency response function module is configured to obtain the target condensate pump frequency response function after installing the shock absorber based on the dynamic relationship and according to the vibration response relationship between the condensate pump and the shock absorber under the excitation of the unbalanced force; The prediction module is configured to predict the shock absorption performance of the condensate pump shock absorber based on the target condensate pump frequency response function and according to the vibration response amplitude of the condensate pump before installing the shock absorber.

9. An electronic device, characterized in that, It includes a memory and a processor, a computer program stored on the memory and executable on the processor, and when the processor executes the computer program, it implements a method for predicting the shock absorption performance of a condensate pump shock absorber according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements a method for predicting the shock absorption performance of a condensate pump shock absorber according to any one of claims 1 to 7.

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