Electric drive sound transfer function calculation method based on space order force, noise standard exceeding analysis method, equipment and storage medium

Abstract

The invention discloses an electrically-driven sound transfer function calculation method based on space order force, a noise standard exceeding analysis method, equipment and a storage medium, unit exciting force is applied to a motor stator tooth part to simulate an electromagnetic force space force type, and the method is used for analyzing the influence of space order force such as 0 and 8 on noise. Response curves, namely sound transfer function curves, of different electric drives under unit excitation are obtained through calculation with a modal superposition method; the same unit excitation is applied to different electric drives, the main reason for noise exceeding can be analyzed by comparing the acoustic transfer function curves of the electric drives, and support is provided for subsequent optimization of electromagnetic force or electric drive structures.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric drive sound transfer function calculation, and specifically relates to an electric drive sound transfer function calculation method based on spatial order force, an electric drive noise exceeding standard analysis method based on the electric drive sound transfer function, a computer device and a storage medium. Background Art

[0002] The main source of electromagnetic noise in motors is the vibration of the iron core and the housing. The vibration of the housing directly radiates noise, and the vibration of the iron core radiates noise outward through the holes in the housing or end cover. The response is mainly caused by the electromagnetic force and the transmission path. Therefore, it is usually impossible to accurately determine the main reason for the excessive noise in the simulation analysis stage of radiation noise. A method is urgently needed to clearly determine the real reason for the excessive noise.

[0003] At the same time, although there are relevant theories on the influence of spatial order forces of electromagnetic noise on noise, it is impossible to intuitively judge the influence of spatial order forces such as 0th and 8th order on noise. Therefore, based on the above problems, it is necessary to simulate the electric-driven acoustic transfer function of spatial order forces for analysis. Summary of the invention

[0004] In order to solve the above-mentioned problems existing in the prior art, the present invention provides a method for calculating the electric drive acoustic transfer function based on spatial order force, a method for analyzing the electric drive noise exceeding the standard based on the electric drive acoustic transfer function, a computer device and a storage medium. A unit exciting force is applied to the stator teeth of the motor to simulate the electromagnetic force spatial force type, which is used to analyze the influence of spatial order forces such as 0 and 8 on noise. The response curves of different electric drives under unit excitation, i.e., the acoustic transfer function curves, are obtained by calculating through the modal superposition method. The same unit excitation is applied to different electric drives, and the main reason for the noise exceeding the standard can be analyzed by comparing the acoustic transfer function curves of each electric drive, thereby providing support for the subsequent optimization of the electromagnetic force or the electric drive structure.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] As a first aspect of the present invention, a method for calculating an electric-driven acoustic transfer function based on a spatial order force is provided, comprising the following steps:

[0007] S1. Establish an electric drive simulation model and calculate the electric drive assembly mode;

[0008] S2. Apply unit electromagnetic excitation force to the stator teeth of the motor to simulate the electromagnetic force spatial force type;

[0009] S3. Apply the above-mentioned unit electromagnetic excitation force to the electric drive simulation model established in step S1, and use the modal superposition method to obtain the electric drive structural sound transmission function curve.

[0010] Furthermore, the step S1 comprises:

[0011] S11. Establish electric drive finite element model;

[0012] S12. Assign materials and properties to the electric drive finite element model;

[0013] S13. Calculate the electric drive assembly mode.

[0014] Furthermore, the electric drive finite element model includes a motor housing, a reducer housing, a motor stator and a motor rotor.

[0015] Furthermore, the step S2 comprises:

[0016] S21. According to the total number of tooth slots Z of the motor stator and the number of skew poles N of the motor rotor, determine the number M of electromagnetic excitation forces to be applied, where M = Z*N;

[0017] S22. Apply frequency domain electromagnetic force to the center of each stator tooth of each oblique pole;

[0018] S23. After the electromagnetic exciting force is determined, the required vibration frequency is calculated according to the required working conditions of the electric drive system.

[0019] Furthermore, in the step, the electromagnetic force F = Asin(ω+φ), the excitation magnitude is changed by assigning the amplitude A, and when a unit excitation force is applied, A = 1; by adjusting the phase The values ​​simulate different spatial order force types.

[0020] Furthermore, in step S3, the modal and damping parameters are called, and the noise response of the electric drive system at each monitoring point is obtained by using the modal superposition method, and then the average sound pressure level of each monitoring point is calculated by using the energy statistics method to obtain the electric drive structure sound transmission function.

[0021] As a second aspect of the present invention, a method for analyzing excessive electric drive noise based on electric drive sound transfer function is provided, which is implemented by the electric drive sound transfer function calculation method described above; and comprises the following steps:

[0022] By adopting the method of steps S1 to S3, the same unit electromagnetic excitation force is applied to different electric drives to obtain electric drive structural sound transfer function curves of different electric drives respectively; the electric drive sound transfer function curves are compared to analyze the reasons for the excessive noise.

[0023] As a third aspect of the present invention, a computer device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the method for calculating an electrically driven acoustic transfer function based on spatial order forces is implemented.

[0024] As a fourth aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, and when the program is executed by a processor, the method for calculating an electrically driven acoustic transfer function based on spatial order forces is implemented.

[0025] The present invention has the following advantages:

[0026] The present invention provides a method for calculating an electric drive acoustic transfer function based on spatial order force, a method for analyzing electric drive noise exceeding the standard based on an electric drive acoustic transfer function, and a primary storage medium of a computer device. A unit exciting force is applied to the stator teeth of a motor to simulate the electromagnetic force spatial force type, so as to analyze the influence of spatial order forces such as 0 and 8 on noise. The response curves of different electric drives under unit excitation, i.e., acoustic transfer function curves, are calculated by a modal superposition method. The same unit excitation is applied to different electric drives, and the main reason for the excessive noise can be analyzed by comparing the acoustic transfer function curves of each electric drive. At the same time, the acoustic transfer function of the existing electric drive structure can be calculated, and the advantages and disadvantages of different electric drive structures can be compared and analyzed. In addition, the corresponding acoustic transfer function curve can be obtained by simulating the spatial 0-order radial electromagnetic force, the tangential electromagnetic force and the combined force of the two on the same model, so as to judge and analyze the influence of different excitation forms on low speed and high speed, and provide theoretical and data support for the subsequent optimization of electromagnetic force or electric drive structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 This is a flow chart of a method for calculating an electric-driven acoustic transfer function based on spatial order force according to Embodiment 1 of the present invention;

[0029] Figure 2 This is a schematic diagram of the spatial 0th order force wave pattern in Example 1 of the present invention;

[0030] Figure 3 A side view showing the application of a 0-order electromagnetic force to each oblique pole in Embodiment 1 of the present invention;

[0031] FIG4( a ) is a top view of applying a 0-order radial electromagnetic force to each oblique pole in Embodiment 1 of the present invention;

[0032] FIG4( b ) is a top view of applying a 0-order tangential electromagnetic force to each oblique pole in Example 1 of the present invention;

[0033] Figure 5 This is a schematic diagram of the arrangement of monitoring points of the electric drive system in Example 1 of the present invention;

[0034] Figure 6 This is a block diagram of the composition principles of a computer device described in Example 3 of the present invention. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0036] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0037] Example 1

[0038] like Figure 1 As shown, a method for calculating the electric-driven acoustic transfer function based on spatial order force includes the following steps:

[0039] S1. Establish an electric drive simulation model and calculate the electric drive assembly mode:

[0040] S11. Establish an electric drive finite element model, including motor housing, reducer housing, motor stator, motor rotor and other related components;

[0041] S12. Assign materials, properties, etc. to the electric drive finite element model;

[0042] S13. Calculate the electric drive assembly mode;

[0043] S2. Apply unit electromagnetic excitation force to the stator teeth of the motor to simulate the electromagnetic force space force type:

[0044] S21. According to the total number of tooth slots Z of the motor stator and the number of skew poles N of the motor rotor, determine the number M of electromagnetic excitation forces to be applied, where M = Z*N;

[0045] S22. Apply frequency domain electromagnetic force at the center of each stator tooth of each skew pole:

[0046] Electromagnetic force F = Asin(ω+φ), the excitation magnitude can be changed by assigning a value to the amplitude A. If a unit excitation force is applied, A = 1. By adjusting the phase The values ​​simulate different spatial order force types;

[0047] S23. After the electromagnetic excitation force is determined, the required vibration frequency is calculated according to the required working conditions of the electric drive system;

[0048] S3. Apply the above-mentioned unit electromagnetic excitation force to the electric drive simulation model established in step S1, call the mode, damping and other parameters and adopt the modal superposition method and other methods to obtain the electric drive structural sound transmission function curve.

[0049] This embodiment takes the space 0th order electromagnetic force as an example. The space 0th order force type is as follows: Figure 2 As shown, the calculation method of the electric drive sound transfer function is described below:

[0050] S1. Establish an electric drive simulation model, including the motor stator and the motor rotor;

[0051] S2. Apply unit electromagnetic excitation force to the stator teeth of the motor to simulate the electromagnetic force space force type:

[0052] S21. Determine the number of teeth on the motor stator and the number of skewed poles on the rotor, and determine the number of forces to be applied M based on the total number of teeth Z on the motor stator and the number of skewed poles N on the motor rotor, where M = Z*N;

[0053] S22. Apply frequency domain electromagnetic force at the center of each stator tooth of each skew pole:

[0054] The types of frequency domain electromagnetic force applied include radial electromagnetic force, tangential electromagnetic force or the combined action of the two forces; if radial force is applied, it is necessary to ensure that the force is perpendicular to the tooth surface, as shown in FIG4(a); if tangential force is applied, it is necessary to ensure that the force is tangential to the tooth surface, as shown in FIG4(b);

[0055] Electromagnetic force is usually in the form of a sine wave, that is, F = Asin (ω + φ). The excitation magnitude can be changed by assigning a value to the amplitude A. When a unit excitation force is applied, A = 1. The phase φ value is adjusted according to different spatial order force types. The spatial 0-order electromagnetic force phase φ = 0. At the same time, A is set according to the ratio of the radial electromagnetic force and the tangential electromagnetic force values ​​of the electric drive. t ;

[0056] S23. After the electromagnetic excitation force is determined, the required vibration frequency is calculated according to the required working conditions of the electric drive system;

[0057] S3. Apply the above-mentioned unit electromagnetic excitation force to the electric drive simulation model established in step S1, call the mode, damping and other parameters to adopt the modal superposition method and other methods to obtain the noise response of the electric drive system at each monitoring point, and then use the energy statistics method to calculate the five-point average sound pressure level to obtain the electric drive structure sound transmission function.

[0058] Example 2

[0059] This embodiment is a method for analyzing excessive electric drive noise based on electric drive sound transfer function, which is implemented based on the electric drive sound transfer function calculation method described in Example 1 and includes the following steps:

[0060] S1. Establish an electric drive simulation model, including the motor stator and the motor rotor;

[0061] S2. Apply unit electromagnetic excitation force to the stator teeth of the motor to simulate the electromagnetic force spatial force type:

[0062] S21. Determine the number of forces to be applied M based on the total number of tooth slots Z of the motor stator and the number of skew poles N of the motor rotor, where M = Z*N;

[0063] S22. Apply frequency domain electromagnetic force at the center of each stator tooth of each oblique pole; where electromagnetic force F = Asin(ω + φ), the excitation magnitude can be changed by assigning a value to the amplitude A. If a unit excitation force is applied, A = 1. By adjusting the phase The values ​​simulate different spatial order force types;

[0064] S23. After the electromagnetic excitation is determined, the required vibration frequency is calculated according to the required working conditions of the electric drive system;

[0065] S3. applying the above-mentioned unit electromagnetic excitation force to the electric drive simulation model established in step S1, calling the mode, damping and other parameters to obtain the electric drive structure sound transmission function curve by using the modal superposition method and other methods;

[0066] S4. Using the method of steps S1 to S3, applying the same unit excitation to different electric drives, and obtaining electric drive structure-borne sound transfer function curves of the different electric drives respectively;

[0067] S5. Compare the acoustic transfer function curves of each electric drive and analyze the main reasons for the excessive noise.

[0068] Example 3

[0069] Figure 6 This is a schematic diagram of the structure of a computer device described in Example 3. Figure 6 A block diagram of an exemplary computer device 12 suitable for use in implementing embodiments of the present invention is shown. Figure 6 The computer device 12 shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0070] like Figure 6 As shown, the computer device 12 is in the form of a general-purpose computing device. The components of the computer device 12 may include, but are not limited to: one or more processors or processing units 16, a system memory 28, and a bus 18 that connects various system components (including the system memory 28 and the processing unit 16).

[0071] Bus 18 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor or a local bus using any of a variety of bus architectures. By way of example, these architectures include, but are not limited to, an Industry Standard Architecture (ISA) bus, a Micro Channel Architecture (MAC) bus, an Enhanced ISA bus, a Video Electronics Standards Association (VESA) local bus, and a Peripheral Component Interconnect (PCI) bus.

[0072] The computer device 12 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by the computer device 12, including volatile and non-volatile media, removable and non-removable media.

[0073] The system memory 28 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) 30 and / or cache memory 32. The computer device 12 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, the storage system 34 may be used to read and write non-removable, non-volatile magnetic media (not shown in FIG. 4 , commonly referred to as a “hard drive”). Although not shown in FIG. 4 , a disk drive for reading and writing to a removable non-volatile disk (e.g., a “floppy disk”) and an optical disk drive for reading and writing to a removable non-volatile optical disk (e.g., a CD-ROM, DVD-ROM or other optical medium) may be provided. In these cases, each drive may be connected to the bus 18 via one or more data medium interfaces. The memory 28 may include at least one program product having a set (e.g., at least one) of program modules that are configured to perform the functions of the various embodiments of the present invention.

[0074] A program / utility 40 having a set (at least one) of program modules 42 may be stored, for example, in the memory 28. Such program modules 42 include, but are not limited to, an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment. The program modules 42 generally perform the functions and / or methods of the embodiments described herein.

[0075] The computer device 12 may also communicate with one or more external devices 14 (e.g., keyboard, pointing device, display 24, etc.), may also communicate with one or more devices that enable a user to interact with the computer device 12, and / or communicate with any device that enables the computer device 12 to communicate with one or more other computing devices (e.g., network card, modem, etc.). Such communication may be performed through an input / output (I / O) interface 22. In addition, the computer device 12 in this embodiment, the display 24 does not exist as an independent individual, but is embedded in the mirror surface, and when the display surface of the display 24 is not displayed, the display surface of the display 24 and the mirror surface are visually integrated. In addition, the computer device 12 may also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN) and / or public network, such as the Internet) through a network adapter 20. As shown in the figure, the network adapter 20 communicates with other modules of the computer device 12 through a bus 18. It should be understood that although not shown in the figures, other hardware and / or software modules may be used in conjunction with the computer device 12, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0076] The processing unit 16 executes various functional applications and data processing by running the programs stored in the system memory 28, for example, implementing a method for calculating an electric-driven acoustic transfer function based on spatial order forces provided in Embodiment 1 of the present invention.

[0077] Example 4

[0078] Embodiment 4 provides a computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, the method for calculating an electrically driven acoustic transfer function based on spatial order forces as described in Embodiment 1 is implemented.

[0079] Any combination of one or more computer-readable media may be used. A computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or device, or any combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in conjunction with an instruction execution system, device, or device.

[0080] Computer-readable signal media may include a data signal propagated in baseband or as part of a carrier wave, which carries a computer-readable program code. Such propagated data signals may take a variety of forms, including, but not limited to, electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0081] Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0082] Computer program code for performing the operations of the present invention may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0083] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for calculating the electric-driven acoustic transfer function based on spatial order force, characterized in that: The following steps are involved: S1. Establish an electric drive simulation model and calculate the electric drive assembly mode; S2. Apply unit electromagnetic excitation force to the stator teeth of the motor to simulate the electromagnetic force spatial force type; S3. Apply the above-mentioned unit electromagnetic excitation force to the electric drive simulation model established in step S1, and use the modal superposition method to obtain the electric drive structural sound transmission function curve.

2. The method for calculating the electric-driven acoustic transfer function based on spatial order force according to claim 1, characterized in that: The step S1 comprises: S11. Establish electric drive finite element model; S12. Assign materials and properties to the electric drive finite element model; S13. Calculate the electric drive assembly mode.

3. The method for calculating the electric-driven acoustic transfer function based on spatial order force according to claim 2, characterized in that: The electric drive finite element model includes a motor housing, a reducer housing, a motor stator and a motor rotor.

4. The method for calculating the electric-driven acoustic transfer function based on spatial order force according to claim 1, characterized in that: The step S2 comprises: S21. According to the total number of tooth slots Z of the motor stator and the number of skew poles N of the motor rotor, determine the number M of electromagnetic excitation forces to be applied, where M = Z*N; S22. Apply frequency domain electromagnetic force to the center of each stator tooth of each oblique pole; S23. After the electromagnetic exciting force is determined, the required vibration frequency is calculated according to the required working conditions of the electric drive system.

5. The method for calculating the electric-driven acoustic transfer function based on spatial order force according to claim 4, characterized in that: In the step, the electromagnetic force F = Asin (ω + φ), the excitation magnitude is changed by assigning the amplitude A, and when a unit excitation force is applied, A = 1; by adjusting the phase The values ​​simulate different spatial order force types.

6. The method for calculating the electric-driven acoustic transfer function based on spatial order force according to claim 1, characterized in that: In step S3, the modal and damping parameters are called, and the noise response of the electric drive system at each monitoring point is obtained by using the modal superposition method, and then the average sound pressure level of each monitoring point is calculated by using the energy statistics method to obtain the electric drive structure sound transmission function.

7. A method for analyzing excessive electric drive noise based on electric drive sound transfer function, which is implemented by the electric drive sound transfer function calculation method according to any one of claims 1 to 6; characterized in that: The following steps are involved: Adopting the method of steps S1 to S3, applying the same unit electromagnetic excitation force to different electric drives, and obtaining electric drive structure-acoustic transfer function curves of the different electric drives respectively; By comparing the acoustic transfer function curves of each electric drive, the reasons for the excessive noise can be analyzed.

8. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the method for calculating the electric-driven acoustic transfer function based on spatial order force as described in any one of claims 1 to 6 is implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method for calculating the electric-driven acoustic transfer function based on spatial order force as described in any one of claims 1 to 6 is implemented.

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