CN118153384A - Modal damping setting method for electric drive system - Google Patents
Modal damping setting method for electric drive system Download PDFInfo
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- CN118153384A CN118153384A CN202410276638.1A CN202410276638A CN118153384A CN 118153384 A CN118153384 A CN 118153384A CN 202410276638 A CN202410276638 A CN 202410276638A CN 118153384 A CN118153384 A CN 118153384A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The invention belongs to the technical field of automobiles, and particularly relates to a modal damping setting method of an electric drive system. The method comprises the following steps: testing the structure transfer function; simulating the structure transfer function; modifying the modal damping; fitting the modal damping; and verifying the accuracy of the mode damping after fitting. According to the invention, a relatively accurate damping value corresponding to each mode of the electric drive is obtained through the structure transfer function test and correction simulation result, and a common electric drive damping curve is determined through the Rayleigh damping curve and the least square method, the curve can be suitable for simulation analysis of other electric drive systems with similar structures, finally, the precision verification is carried out on the fitted mode damping, the precision meets the current simulation requirement, the noise prediction and the problem identification can be carried out at the initial stage of electric drive project development, the electric drive structure optimization at the later stage is reduced, the development period is shortened, and the development cost is reduced.
Description
Technical Field
The invention belongs to the technical field of automobiles, and particularly relates to a modal damping setting method of an electric drive system.
Background
In order to predict the noise of the electric drive project in the early stage of development, a simulation analysis model of the electric drive project needs to be accurately established. The modal damping of the electric drive system has obvious influence on the response of vibration noise and is a key parameter of simulation analysis.
With the development of integration of the electric drive system, the motor, the speed reducer, the inverter and other components are integrated into a complex system, and the integration of different components results in the traditional damping setting method, so that the damping is set to a constant value, and the method is not applicable any more.
Disclosure of Invention
In order to solve the problems, the invention provides a method for setting the modal damping of an electric drive system, which is extremely accurate in obtaining the modal damping of the electric drive through experimental tests and data fitting.
The technical scheme of the invention is as follows in combination with the accompanying drawings:
In a first aspect, an embodiment of the present invention provides a method for setting modal damping of an electric drive system, including the following steps:
testing the structure transfer function;
simulating the structure transfer function;
Modifying the modal damping;
Fitting the modal damping;
and verifying the accuracy of the mode damping after fitting.
Further, the specific method for testing the structural transfer function is as follows:
and measuring the structural transfer function of the electric drive state from the tooth surface of the stator to the outer surface of the electric drive, wherein excitation points are selected at equal intervals along the circumferential direction of the stator to be more than 4 points, and response points are selected on the motor, the speed reducer and the inverter respectively.
Further, the specific method for simulating the structural transfer function is as follows:
Establishing an electric drive finite element model, wherein the electric drive finite element model comprises a shell, a stator detailed structure and internal mass; the excitation point and the response point are consistent with the test position, initial modal damping is set, and the structural transfer function is calculated.
Further, the specific method for correcting the mode damping is as follows:
the difference value of each response curve between simulation and test is minimized by adjusting the damping value of each order mode; and finally obtaining the modal damping value under each frequency.
Further, the specific method for fitting the mode damping is as follows:
and using a Rayleigh damping curve to fit modal damping, and determining two coefficients of a damping curve according to a least square method.
Further, the specific method for verifying the precision of the mode damping after fitting is as follows:
and simulating and testing and comparing the radiation noise of the electric drive system, so as to verify the simulation accuracy of the electric drive main order noise.
In a second aspect, an embodiment of the present invention further provides a device for setting modal damping of an electric drive system, including:
The test module is used for testing the structure transfer function;
the simulation module is used for simulating the structure transfer function;
the correction module is used for correcting the modal damping;
the fitting module is used for fitting the modal damping;
and the verification module is used for verifying the accuracy of the mode damping after fitting.
In a third aspect, a terminal is provided, including:
One or more processors;
a memory for storing the one or more processor-executable instructions;
Wherein the one or more processors are configured to:
the method according to the first aspect of the embodiment of the invention is performed.
In a fourth aspect, a non-transitory computer readable storage medium is provided, which when executed by a processor of a terminal, enables the terminal to perform the method according to the first aspect of the embodiments of the invention.
In a fifth aspect, an application product is provided, which when running at a terminal causes the terminal to perform the method according to the first aspect of the embodiments of the invention.
The beneficial effects of the invention are as follows:
1) According to the invention, by combining test and data fitting, the electric drive modal damping value can be accurately obtained aiming at a more complex electric drive integrated structure;
2) The invention plays a key role in accurate modeling of the electric drive and improvement of noise simulation analysis precision, can predict noise and identify problems in the early stage of development of the electric drive project, reduces the structural optimization of the electric drive in the later stage, shortens the development period and reduces the development cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for setting modal damping of an electric drive system according to the present invention;
FIG. 2 is a schematic diagram of a transfer function simulation;
FIG. 3 is a schematic diagram showing a comparison of simulation and test transfer functions;
FIG. 4 is a schematic diagram of a damping curve;
FIG. 5 is a schematic diagram showing the comparison of the test results of the noise simulator;
FIG. 6 is a schematic structural diagram of a modal damping configuration device of an electric drive system according to the present invention;
Fig. 7 is a schematic block diagram of a terminal structure.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
Example 1
Fig. 1 is a flowchart of a method for setting modal damping of an electric drive system according to an embodiment of the present invention, where the method may be performed by an apparatus for setting modal damping of an electric drive system according to an embodiment of the present invention, and the apparatus may be implemented in software and/or hardware.
A modal damping setting method of an electric drive system comprises the following steps:
s1, testing a structural transfer function, wherein the structural transfer function is specifically as follows:
And measuring the structural transfer function of the electric drive state from the tooth surface of the stator to the outer surface of the electric drive, wherein excitation points are selected at equal intervals along the circumferential direction of the stator to be more than 4 points, and responding points are respectively selected on the motor, the speed reducer and the inverter to propose to select the middle position of a large plane or a curved surface.
Referring to fig. 2, S2, the structural transfer function is simulated as follows:
Establishing an electric drive finite element model, wherein the electric drive finite element model comprises a shell, a stator detailed structure and internal mass; the excitation point and the response point are consistent with the test position, initial modal damping is set, and the structural transfer function is calculated.
S3, correcting the mode damping, wherein the mode damping is specifically as follows:
the difference value of each response curve between simulation and test is minimized by adjusting the damping value of each order mode; and finally obtaining the modal damping value under each frequency.
Referring to fig. 3, by adjusting the modal damping value of the simulation, the difference between the simulated and the tested transfer functions is within 10%:
referring to fig. 4, S4 is a fitting of the model damping, specifically as follows:
and using a Rayleigh damping curve to fit modal damping, and determining two coefficients of a damping curve according to a least square method.
Rayleigh (Rayleigh) damping is an orthogonal damping widely used in structural dynamics analysis, which assumes that the damping matrix of the structure is a combination of mass and stiffness matrices, i.e., [ C ] =a 0 [ M ] +
A 1 [ M ], where a 0 and a 1 are two scaling coefficients.
Referring to fig. 5, S5, accuracy verification is performed on the mode damping after fitting, specifically as follows:
And simulating and testing and comparing the radiation noise of the electric drive system, so as to verify the simulation accuracy of the electric drive main order noise. The maximum 2dB (A) of the simulation result of the electric drive main order noise at the peak value and the maximum 2dB (A) of the test result can be seen from the graph, and the precision meets the current simulation requirement of the term.
In summary, the invention obtains the more accurate damping value corresponding to each mode of the electric drive through the structure transfer function test and correction simulation result, and determines a general electric drive damping curve through the Rayleigh damping curve and the least square method, the curve can be suitable for simulation analysis of other electric drive systems with similar structures, finally, the precision verification is carried out on the mode damping after fitting, the precision meets the current simulation requirement, the noise prediction and the problem identification can be carried out at the early stage of the development of the electric drive project, the electric drive structure optimization at the later stage is reduced, the development period is shortened, and the development cost is reduced.
Example two
Referring to fig. 6, a modal damping setting apparatus of an electric drive system includes:
The test module is used for testing the structure transfer function;
the simulation module is used for simulating the structure transfer function;
the correction module is used for correcting the modal damping;
the fitting module is used for fitting the modal damping;
and the verification module is used for verifying the accuracy of the mode damping after fitting.
Example III
Fig. 7 is a block diagram of a terminal according to an embodiment of the present application, and the terminal may be a terminal according to the above embodiment. The terminal may be a portable mobile terminal such as: smart phone, tablet computer. Terminals may also be referred to by other names, user equipment, portable terminals, etc.
Generally, the terminal includes: a processor 301 and a memory 302.
Processor 301 may include one or more processing cores, such as a 4-core processor, an 8-core processor, and the like. The processor 301 may be implemented in at least one hardware form of DSP (DIGITAL SIGNAL Processing), FPGA (Field-Programmable gate array), PLA (Programmable Logic Array ). Processor 301 may also include a main processor, which is a processor for processing data in an awake state, also referred to as a CPU (Central Processing Unit ), and a coprocessor; a coprocessor is a low-power processor for processing data in a standby state. In some embodiments, the processor 301 may integrate a GPU (Graphics Processing Unit, image processor) for rendering and drawing of content required to be displayed by the display screen. In some embodiments, the processor 301 may also include an AI (ARTIFICIAL INTELLIGENCE ) processor for processing computing operations related to machine learning.
Memory 302 may include one or more computer-readable storage media, which may be tangible and non-transitory. Memory 302 may also include high-speed random access memory, as well as non-volatile memory, such as one or more magnetic disk storage devices, flash memory storage devices. In some embodiments, a non-transitory computer readable storage medium in memory 302 is used to store at least one instruction for execution by processor 301 to implement an electro-drive system modal damping setting method provided in the present application.
In some embodiments, the terminal may further optionally include: a peripheral interface 303, and at least one peripheral. Specifically, the peripheral device includes: at least one of radio frequency circuitry 304, touch screen 305, camera 306, audio circuitry 307, positioning component 308, and power supply 309.
The peripheral interface 303 may be used to connect at least one Input/Output (I/O) related peripheral to the processor 301 and the memory 302. In some embodiments, processor 301, memory 302, and peripheral interface 303 are integrated on the same chip or circuit board; in some other embodiments, either or both of the processor 301, the memory 302, and the peripheral interface 303 may be implemented on separate chips or circuit boards, which is not limited in this embodiment.
The Radio Frequency circuit 304 is configured to receive and transmit RF (Radio Frequency) signals, also known as electromagnetic signals. The radio frequency circuitry 304 communicates with a communication network and other communication devices via electromagnetic signals. The radio frequency circuit 304 converts an electrical signal into an electromagnetic signal for transmission, or converts a received electromagnetic signal into an electrical signal. Optionally, the radio frequency circuit 304 includes: antenna systems, RF transceivers, one or more amplifiers, tuners, oscillators, digital signal processors, codec chipsets, subscriber identity module cards, and so forth. The radio frequency circuitry 304 may communicate with other terminals via at least one wireless communication protocol. The wireless communication protocol includes, but is not limited to: the world wide web, metropolitan area networks, intranets, generation mobile communication networks (2G, 3G, 4G, and 5G), wireless local area networks, and/or WiFi (WIRELESS FIDELITY ) networks. In some embodiments, the radio frequency circuit 304 may further include NFC (NEAR FIELD Communication) related circuits, which is not limited by the present application.
The touch display screen 305 is used to display a UI (User Interface). The UI may include graphics, text, icons, video, and any combination thereof. The touch screen 305 also has the ability to collect touch signals at or above the surface of the touch screen 305. The touch signal may be input as a control signal to the processor 301 for processing. The touch screen 305 is used to provide virtual buttons and/or virtual keyboards, also known as soft buttons and/or soft keyboards. In some embodiments, the touch display 305 may be one, providing a front panel of the terminal; in other embodiments, the touch display screen 305 may be at least two, respectively disposed on different surfaces of the terminal or in a folded design; in still other embodiments, the touch display 305 may be a flexible display disposed on a curved surface or a folded surface of the terminal. Even more, the touch display screen 305 may be arranged in an irregular pattern that is not rectangular, i.e., a shaped screen. The touch display 305 may be made of LCD (Liquid CRYSTAL DISPLAY), OLED (Organic Light-Emitting Diode) or other materials.
The camera assembly 306 is used to capture images or video. Optionally, the camera assembly 306 includes a front camera and a rear camera. In general, a front camera is used for realizing video call or self-photographing, and a rear camera is used for realizing photographing of pictures or videos. In some embodiments, the number of the rear cameras is at least two, and the rear cameras are any one of a main camera, a depth camera and a wide-angle camera, so as to realize fusion of the main camera and the depth camera to realize a background blurring function, and fusion of the main camera and the wide-angle camera to realize a panoramic shooting function and a Virtual Reality (VR) shooting function. In some embodiments, camera assembly 306 may also include a flash. The flash lamp can be a single-color temperature flash lamp or a double-color temperature flash lamp. The dual-color temperature flash lamp refers to a combination of a warm light flash lamp and a cold light flash lamp, and can be used for light compensation under different color temperatures.
The audio circuit 307 is used to provide an audio interface between the user and the terminal. The audio circuit 307 may include a microphone and a speaker. The microphone is used for collecting sound waves of users and environments, converting the sound waves into electric signals, and inputting the electric signals to the processor 301 for processing, or inputting the electric signals to the radio frequency circuit 304 for voice communication. For the purpose of stereo acquisition or noise reduction, a plurality of microphones can be respectively arranged at different parts of the terminal. The microphone may also be an array microphone or an omni-directional pickup microphone. The speaker is used to convert electrical signals from the processor 301 or the radio frequency circuit 304 into sound waves. The speaker may be a conventional thin film speaker or a piezoelectric ceramic speaker. When the speaker is a piezoelectric ceramic speaker, not only the electric signal can be converted into a sound wave audible to humans, but also the electric signal can be converted into a sound wave inaudible to humans for ranging and other purposes. In some embodiments, the audio circuit 307 may also include a headphone jack.
The location component 308 is operative to locate the current geographic location of the terminal for navigation or LBS (Location Based Service, location-based services). The positioning component 308 may be a positioning component based on the united states GPS (Global Positioning System ), the chinese beidou system.
The power supply 309 is used to power the various components in the terminal. The power source 309 may be alternating current, direct current, disposable or rechargeable. When the power source 309 comprises a rechargeable battery, the rechargeable battery may be a wired rechargeable battery or a wireless rechargeable battery. The wired rechargeable battery is a battery charged through a wired line, and the wireless rechargeable battery is a battery charged through a wireless coil. The rechargeable battery may also be used to support fast charge technology.
It will be appreciated by those skilled in the art that the structure shown in fig. 7 is not limiting of the terminal and may include more or fewer components than shown, or may combine certain components, or may employ a different arrangement of components.
Example IV
In an exemplary embodiment, there is also provided a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method for setting modal damping of an electric drive system as provided by all the inventive embodiments of the present application.
Any combination of one or more computer readable media may be employed. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, 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 disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
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.
Computer program code for carrying out operations of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).
Example five
In an exemplary embodiment, an application program product is also provided, comprising one or more instructions executable by the processor 301 of the above device to perform the above method of modal damping setting of an electric drive system.
Although embodiments of the present invention have been disclosed above, they are not limited to the use listed in the description and modes of implementation. It can be applied to various fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. Therefore, the invention is not to be limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (9)
1. The modal damping setting method of the electric drive system is characterized by comprising the following steps of:
testing the structure transfer function;
simulating the structure transfer function;
Modifying the modal damping;
Fitting the modal damping;
and verifying the accuracy of the mode damping after fitting.
2. The method for setting modal damping of an electric drive system according to claim 1, wherein the specific method for testing the structural transfer function is as follows:
and measuring the structural transfer function of the electric drive state from the tooth surface of the stator to the outer surface of the electric drive, wherein excitation points are selected at equal intervals along the circumferential direction of the stator to be more than 4 points, and response points are selected on the motor, the speed reducer and the inverter respectively.
3. The method for setting modal damping of an electric drive system according to claim 1, wherein the specific method for simulating the structural transfer function is as follows:
Establishing an electric drive finite element model, wherein the electric drive finite element model comprises a shell, a stator detailed structure and internal mass; the excitation point and the response point are consistent with the test position, initial modal damping is set, and the structural transfer function is calculated.
4. The method for setting modal damping of an electric drive system according to claim 1, wherein the specific method for correcting the modal damping is as follows:
the difference value of each response curve between simulation and test is minimized by adjusting the damping value of each order mode; and finally obtaining the modal damping value under each frequency.
5. The method for setting modal damping of an electric drive system according to claim 1, wherein the specific method for fitting the modal damping is as follows:
and using a Rayleigh damping curve to fit modal damping, and determining two coefficients of a damping curve according to a least square method.
6. The method for setting modal damping of an electric drive system according to claim 1, wherein the specific method for verifying the accuracy of the fitted modal damping is as follows:
and simulating and testing and comparing the radiation noise of the electric drive system, so as to verify the simulation accuracy of the electric drive main order noise.
7. An electric drive system modal damping setting device, comprising:
The test module is used for testing the structure transfer function;
the simulation module is used for simulating the structure transfer function;
the correction module is used for correcting the modal damping;
the fitting module is used for fitting the modal damping;
and the verification module is used for verifying the accuracy of the mode damping after fitting.
8. A terminal, comprising:
One or more processors;
a memory for storing the one or more processor-executable instructions;
Wherein the one or more processors are configured to:
A method of setting modal damping of an electric drive system as claimed in any one of claims 1 to 6.
9. A non-transitory computer readable storage medium, characterized in that instructions in the storage medium, when executed by a processor of a terminal, enable the terminal to perform an electro-drive system modal damping setting method according to any one of claims 1 to 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410276638.1A CN118153384A (en) | 2024-03-12 | 2024-03-12 | Modal damping setting method for electric drive system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410276638.1A CN118153384A (en) | 2024-03-12 | 2024-03-12 | Modal damping setting method for electric drive system |
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| CN202410276638.1A Pending CN118153384A (en) | 2024-03-12 | 2024-03-12 | Modal damping setting method for electric drive system |
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