CN113158513B - Method, device and equipment for determining center frequency of dynamic vibration absorber - Google Patents
Method, device and equipment for determining center frequency of dynamic vibration absorber Download PDFInfo
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Abstract
The invention provides a method, a device and equipment for determining the center frequency of a dynamic vibration absorber, wherein the method comprises the following steps: acquiring vibration reduction frequency and vibration reduction position information required by the whole vehicle; determining a target center frequency of the dynamic vibration absorber according to the vibration reduction frequency required by the whole vehicle; respectively establishing the dynamic vibration absorber and the finite element model of the whole vehicle; according to the vibration reduction position information, assembling a finite element model of the dynamic vibration absorber to a corresponding position of the finite element model of the whole vehicle; debugging preset parameters of the dynamic vibration absorber until the center frequency of the dynamic vibration absorber in the whole vehicle state reaches the target center frequency; and separating the finite element model of the debugged dynamic vibration absorber from the finite element model of the whole vehicle, and calculating the actual center frequency of the debugged dynamic vibration absorber. The invention effectively solves the technical problem that the dynamic vibration absorber does not play a role in vibration absorption after being arranged on a real vehicle.
Description
Technical Field
The invention relates to the technical field of dynamic vibration absorbers, in particular to a method, a device and equipment for determining the center frequency of a dynamic vibration absorber.
Background
In the research and development process of automobiles, after the automobiles frequently touch the actual automobiles, certain systems are unreasonably matched, so that the natural mode frequency of the systems is excited, and the phenomenon of booming or resonance in the automobiles is caused. At this time, the structure is changed again, which causes a change of the mold, resulting in an increase of cost, and meanwhile, other attribute problems (such as strength durability, safety, etc.) caused by the structural change need to be reevaluated, which can prolong the period of automobile development. If the booming and resonance problem is caused by a single frequency range, development Zhou Si is shortened to reduce the cost of solving the problem, and a dynamic vibration absorber is often used.
An additional subsystem is added to the vibration system, so that the subsystem absorbs part of the energy generated by the vibration, and the energy transferred to the main vibration system is correspondingly reduced. Dynamic vibration absorbers are now widely used in a variety of industries, including construction, electrical and mechanical. The dynamic vibration absorber can effectively inhibit the vibration of a structure with a small frequency variation range; if the excitation frequency variation range is known, the dynamic vibration absorber is more effective in controlling the vibration of the structure. Dynamic vibration absorbers have a good ability to attenuate vibration energy and are often used to solve resonance problems near specific frequencies.
The core of the dynamic vibration absorber is the center frequency, namely the vibration in which frequency range is to be reduced, but in practice, the center frequency of the dynamic vibration absorber is greatly affected by the boundary, and the situation that the actual center frequency of the dynamic vibration absorber is inconsistent with the center frequency of the dynamic vibration absorber installed on a real vehicle often occurs, for example, the real vehicle needs a 30Hz dynamic vibration absorber, and a manufacturer actually installs the 30Hz dynamic vibration absorber produced according to the requirement on the real vehicle only at 28Hz, so that the dynamic vibration absorber does not play a role in vibration absorption after being installed on the real vehicle.
Disclosure of Invention
Based on the above, the invention aims to provide a method, a device and equipment for determining the center frequency of a dynamic vibration absorber, so as to solve the technical problem that the existing dynamic vibration absorber does not play a role in vibration absorption after being mounted on a real vehicle.
According to the embodiment of the invention, the method for determining the center frequency of the dynamic vibration absorber comprises the following steps:
acquiring vibration reduction frequency and vibration reduction position information required by the whole vehicle;
determining a target center frequency of the dynamic vibration absorber according to the vibration reduction frequency required by the whole vehicle;
respectively establishing the dynamic vibration absorber and the finite element model of the whole vehicle;
according to the vibration reduction position information, assembling a finite element model of the dynamic vibration absorber to a corresponding position of the finite element model of the whole vehicle;
debugging preset parameters of the dynamic vibration absorber until the center frequency of the dynamic vibration absorber in the whole vehicle state reaches the target center frequency;
and separating the finite element model of the debugged dynamic vibration absorber from the finite element model of the whole vehicle, and calculating the actual center frequency of the debugged dynamic vibration absorber.
In addition, the method for determining the center frequency of the dynamic vibration absorber according to the above embodiment of the present invention may further have the following additional technical features:
further, the step of obtaining vibration reduction frequency and vibration reduction position information required by the whole vehicle comprises the following steps:
NVH test is carried out on the whole vehicle to determine the vibration position and the vibration frequency of the whole vehicle;
and determining vibration damping frequency and vibration damping position information required by the whole vehicle according to the vibration position and vibration frequency of the whole vehicle.
Further, the step of determining the target center frequency of the dynamic vibration absorber according to the vibration reduction frequency required by the whole vehicle, wherein the vibration reduction frequency required by the whole vehicle is a frequency interval, comprises the following steps:
calculating the interval midpoint value of the vibration reduction frequency required by the whole vehicle;
and determining the target center frequency of the dynamic vibration absorber according to the interval intermediate value.
Further, the step of adjusting the preset parameters of the dynamic vibration absorber until the center frequency of the dynamic vibration absorber on the whole vehicle reaches the target center frequency comprises the following steps:
adjusting the mass and/or the bushing rigidity of the dynamic vibration absorber, and calculating the center frequency of the adjusted dynamic vibration absorber in the whole vehicle state;
judging whether the central frequency of the debugged dynamic vibration absorber in the whole vehicle state reaches the target central frequency;
if yes, executing the step of separating the finite element model of the debugged dynamic vibration absorber from the finite element model of the whole vehicle, and calculating the actual center frequency of the debugged dynamic vibration absorber;
and if so, returning to execute the step of debugging the mass and/or the bushing stiffness of the dynamic vibration absorber and calculating the center frequency of the debugged dynamic vibration absorber in the whole vehicle state.
Further, the step of calculating the actual center frequency of the tuned dynamic vibration absorber includes:
and calculating the modal frequency of the finite element model of the debugged dynamic vibration absorber to obtain the actual center frequency of the debugged dynamic vibration absorber.
According to an embodiment of the invention, a device for determining a center frequency of a dynamic vibration absorber comprises:
the information acquisition module is used for acquiring vibration reduction frequency and vibration reduction position information required by the whole vehicle;
the target determining module is used for determining the target center frequency of the dynamic vibration absorber according to the vibration reduction frequency required by the whole vehicle;
the model building module is used for respectively building the dynamic vibration absorber and the finite element model of the whole vehicle;
the model assembly module is used for assembling the finite element model of the dynamic vibration absorber to the corresponding position of the finite element model of the whole vehicle according to the vibration reduction position information;
the frequency debugging module is used for debugging preset parameters of the dynamic vibration absorber until the center frequency of the dynamic vibration absorber in the whole vehicle state reaches the target center frequency;
the frequency determining module is used for separating the finite element model of the debugged dynamic vibration absorber from the finite element model of the whole vehicle and calculating the actual center frequency of the debugged dynamic vibration absorber.
In addition, the device for determining the center frequency of the dynamic vibration absorber according to the above embodiment of the present invention may further have the following additional technical features:
further, the information acquisition module includes:
the test analysis unit is used for carrying out NVH test on the whole vehicle so as to determine the vibration position and the vibration frequency of the whole vehicle;
and the information determining unit is used for determining vibration reduction frequency and vibration reduction position information required by the whole vehicle according to the vibration position and vibration frequency of the whole vehicle.
Further, the frequency determining module includes:
the frequency calculation unit is used for calculating the modal frequency of the finite element model of the debugged dynamic vibration absorber to obtain the actual center frequency of the debugged dynamic vibration absorber.
The present invention also proposes a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above-described method of determining the center frequency of a dynamic vibration absorber.
The invention also provides a device for determining the center frequency of the dynamic vibration absorber, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the method for determining the center frequency of the dynamic vibration absorber when executing the program.
Compared with the prior art: the method comprises the steps of establishing a finite element model of a power vibration absorber and a whole vehicle, assembling the finite element model of the power vibration absorber to a corresponding position of the finite element model of the whole vehicle according to a vibration reduction position of the whole vehicle, debugging preset parameters of the power vibration absorber, enabling the center frequency of the power vibration absorber in a whole vehicle state to reach the target center frequency required by the whole vehicle, separating the debugged finite element model of the power vibration absorber, calculating the actual center frequency of the debugged power vibration absorber, and thus manufacturers can produce the power vibration absorber according to the actual center frequency to just reach the required target center frequency when the power vibration absorber is assembled on the real vehicle, and the technical problem that the power vibration absorber does not play a vibration absorption role after being assembled on the real vehicle is effectively solved.
Drawings
Fig. 1 is a flowchart of a method of determining a center frequency of a dynamic vibration absorber in a first embodiment of the present invention;
FIG. 2 is a flowchart of a method for determining the center frequency of a dynamic vibration absorber in a second embodiment of the present invention;
fig. 3 is a schematic structural view of a device for determining a center frequency of a dynamic vibration absorber according to a third embodiment of the present invention;
fig. 4 is a schematic structural view of a device for determining the center frequency of a dynamic vibration absorber in a fourth embodiment of the present invention.
The following detailed description will further illustrate the invention with reference to the above-described drawings.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Several embodiments of the invention are presented in the figures. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "mounted" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Example 1
Referring to fig. 1, a method for determining a center frequency of a dynamic vibration absorber according to a first embodiment of the present invention may be applied to a device for determining a center frequency of a dynamic vibration absorber, where the device for determining a center frequency of a dynamic vibration absorber may be implemented by software and/or hardware, and the method specifically includes steps S01 to S03.
And S01, acquiring vibration reduction frequency and vibration reduction position information required by the whole vehicle.
The vibration reduction frequency required by the whole vehicle can be a frequency range (for example, 20-40 Hz) or a frequency point (for example, 30 Hz), which represents the vibration of the whole vehicle in which frequency range needs to be reduced, and also represents the vibration frequency existing in the whole vehicle. The vibration reduction position information can be coordinate values under a whole vehicle coordinate system, and represents the vibration of which position of the whole vehicle needs to be reduced, and also represents the vibration of which position of the whole vehicle exists, and is also the position where the follow-up dynamic vibration absorber is installed; or the vibration damping position information may be a name of a certain component, which represents that the component vibrates.
In specific implementation, vibration damping frequency and Vibration damping position information required by the whole vehicle can be tested by performing an NVH (Noise/Vibration/Harshness) test on the whole vehicle. In addition, the vibration reduction frequency and vibration reduction position information required by the whole vehicle can be acquired through manual input of a designer or automatic extraction from NVH experimental data.
And step S02, determining the target center frequency of the dynamic vibration absorber according to the vibration reduction frequency required by the whole vehicle.
In the implementation, when the vibration reduction frequency required by the whole vehicle is a frequency interval, the intermediate value of the frequency interval can be taken as the target center frequency of the dynamic vibration absorber. When the vibration reduction frequency required by the whole vehicle is a frequency point, the frequency point can be taken as the target center frequency of the dynamic vibration absorber.
The target center frequency of the dynamic vibration absorber refers to the center frequency of the dynamic vibration absorber actually installed on a real vehicle. Therefore, the dynamic vibration absorber can be guaranteed to play a role in vibration absorption after being mounted on a real vehicle.
And S03, respectively establishing the dynamic vibration absorber and the finite element model of the whole vehicle.
In the concrete implementation, the dynamic vibration absorber (comprising the materials, the mass, the rubber dynamic stiffness and the like of the dynamic vibration absorber) and CAD geometric data of the whole vehicle (if the dynamic vibration absorber of the vehicle type is arranged on a beam at the front end of the vehicle body, the CAD of the front end of the whole white vehicle body or the vehicle body is recommended to be used, and the rigidity of the mounting point of the dynamic vibration absorber needs to be considered), and the material marks, the weight data, the connection and the like corresponding to all parts; then, constructing a three-dimensional model of the dynamic vibration absorber and the whole vehicle based on CAD geometric data of the dynamic vibration absorber and the whole vehicle; and then the three-dimensional model of the dynamic vibration absorber and the whole vehicle is imported into Hypermesh of finite element pretreatment software for processing, so as to generate the finite element model of the dynamic vibration absorber and the whole vehicle.
Specifically, the following is a process of the dynamic vibration absorber in Hypermesh software:
(1) A three-dimensional model of the dynamic vibration absorber is imported and grid division is carried out;
(2) Defining a grid cell type; the rubber of the dynamic vibration absorber is replaced by a six-direction stiffness spring unit (cbush) in a simplified way, and stiffness parameters are input;
(3) Defining material properties and densities of the grid cells; the quality of the model is required to be ensured to be consistent with the actual quality;
(4) Defining attributes, entities, shells, etc. of the units;
(5) Defining boundary conditions of the dynamic vibration absorber; if mounted at the boundary of a gantry that is sufficiently rigid, then the constraints are all in the model. If installed in a less rigid location, a finite element model of the installation location needs to be built as well, which takes into account the rigidity of the installation location.
And S04, assembling the finite element model of the dynamic vibration absorber to the corresponding position of the finite element model of the whole vehicle according to the vibration reduction position information.
And step S05, debugging preset parameters of the dynamic vibration absorber until the center frequency of the dynamic vibration absorber in the whole vehicle state reaches the target center frequency.
The center frequency of the dynamic vibration absorber is influenced by three factors of the mass, the rigidity of the bushing and the rigidity of the mounting point, and the step is not considered in the debugging stage, so that the center frequency of the dynamic vibration absorber in the whole vehicle state reaches the target center frequency directly through debugging the mass and/or the rigidity of the bushing of the dynamic vibration absorber. I.e. the preset parameter is mass and/or bushing stiffness.
And step S06, separating the finite element model of the debugged dynamic vibration absorber from the finite element model of the whole vehicle, and calculating the actual center frequency of the debugged dynamic vibration absorber.
It should be understood that, just because the center frequency of the dynamic vibration absorber is affected by the rigidity of the mounting point, the situation that the actual center frequency of the dynamic vibration absorber is inconsistent with the center frequency of the dynamic vibration absorber mounted on a real vehicle is caused, for example, the real vehicle needs a 30Hz dynamic vibration absorber, if a manufacturer directly produces the dynamic vibration absorber according to the standard that the center frequency is 30Hz, the produced 30Hz dynamic vibration absorber is actually mounted on the real vehicle only at 28Hz, and the corresponding vibration absorbing effect is not achieved. Therefore, through model simulation, the center frequency of the power vibration absorber actually mounted on the real vehicle reaches the center frequency (namely the target center frequency) required by the whole vehicle, the actual center frequency of the power vibration absorber is reversely pushed out, and manufacturers are informed to produce according to the actual center frequency, so that the center frequency of the power vibration absorber mounted on the real vehicle just reaches the center frequency required by the whole vehicle, and the corresponding vibration absorbing effect is effectively achieved. For example, the actual vehicle needs a power vibration absorber of 30Hz, after the reverse deduction by the method of the embodiment, the actual center frequency of the power vibration absorber is 35Hz, and a manufacturer is informed to produce the power vibration absorber with the center frequency of 35Hz, so that the center frequency of the produced 35Hz power vibration absorber mounted on the actual vehicle is exactly 30Hz.
In summary, the method for determining the center frequency of the dynamic vibration absorber in the embodiment of the invention establishes the finite element model of the dynamic vibration absorber and the whole vehicle, assembles the finite element model of the dynamic vibration absorber to the corresponding position of the finite element model of the whole vehicle according to the vibration reduction position of the whole vehicle, adjusts the preset parameters of the dynamic vibration absorber to ensure that the center frequency of the dynamic vibration absorber in the whole vehicle state reaches the target center frequency required by the whole vehicle, separates the adjusted finite element model of the dynamic vibration absorber, and calculates the actual center frequency of the adjusted dynamic vibration absorber, so that a manufacturer can just achieve the required target center frequency when the dynamic vibration absorber produced according to the actual center frequency is assembled on the real vehicle, thereby effectively solving the technical problem that the dynamic vibration absorber does not play a role in vibration absorption after being assembled on the real vehicle.
Example two
Referring to fig. 2, a method for determining a center frequency of a dynamic vibration absorber according to a second embodiment of the present invention may be applied to a device for determining a center frequency of a dynamic vibration absorber, where the device for determining a center frequency of a dynamic vibration absorber may be implemented in software and/or hardware, and the method specifically includes steps S11 to S19.
And S11, carrying out NVH test on the whole vehicle to determine the vibration position and the vibration frequency of the whole vehicle.
And step S12, determining vibration reduction frequency and vibration reduction position information required by the whole vehicle according to the vibration position and vibration frequency of the whole vehicle, wherein the vibration reduction frequency required by the whole vehicle is a frequency interval.
Wherein, the vibration position is the same as the vibration reduction position, and the vibration frequency is the same as the vibration reduction frequency.
And step S13, calculating the interval midpoint value of the vibration reduction frequency required by the whole vehicle.
And S14, determining the target center frequency of the dynamic vibration absorber according to the interval intermediate value.
Wherein the target center frequency of the dynamic vibration absorber is equal to the interval intermediate value.
And S15, respectively establishing the dynamic vibration absorber and the finite element model of the whole vehicle.
And S16, assembling the finite element model of the dynamic vibration absorber to the corresponding position of the finite element model of the whole vehicle according to the vibration reduction position information.
And S17, adjusting the mass and/or the bushing rigidity of the dynamic vibration absorber, and calculating the center frequency of the adjusted dynamic vibration absorber in the whole vehicle state.
And S18, judging whether the central frequency of the debugged dynamic vibration absorber in the whole vehicle state reaches the target central frequency.
When judging that the central frequency of the debugged dynamic vibration absorber in the whole vehicle state reaches the target central frequency, executing step S19; and when judging that the central frequency of the debugged dynamic vibration absorber in the whole vehicle state does not reach the target central frequency, returning to the step S17.
And S19, separating the finite element model of the debugged dynamic vibration absorber from the finite element model of the whole vehicle, and calculating the actual center frequency of the debugged dynamic vibration absorber.
In a specific implementation, the step of calculating the actual center frequency of the tuned dynamic vibration absorber includes:
and calculating the modal frequency of the finite element model of the debugged dynamic vibration absorber to obtain the actual center frequency of the debugged dynamic vibration absorber. Namely, the present embodiment obtains the center frequency of the dynamic vibration absorber by calculating the modal frequency of the finite element model. Similarly, when the center frequency of the dynamic vibration absorber in the whole vehicle state is calculated, the mode frequency of the dynamic vibration absorber in the whole model can be calculated.
Example III
In another aspect, referring to fig. 3, a device for determining a center frequency of a dynamic vibration absorber according to a third embodiment of the present invention is shown, where the device for determining a center frequency of a dynamic vibration absorber includes:
the information acquisition module 11 is used for acquiring vibration reduction frequency and vibration reduction position information required by the whole vehicle;
the target determining module 12 is used for determining the target center frequency of the dynamic vibration absorber according to the vibration reduction frequency required by the whole vehicle;
the model construction module 13 is used for respectively constructing the dynamic vibration absorber and the finite element model of the whole vehicle;
the model assembling module 14 is used for assembling the finite element model of the dynamic vibration absorber to the corresponding position of the finite element model of the whole vehicle according to the vibration reduction position information;
the frequency debugging module 15 is used for debugging preset parameters of the dynamic vibration absorber until the center frequency of the dynamic vibration absorber in the whole vehicle state reaches the target center frequency;
the frequency determining module 16 is configured to separate the finite element model of the tuned dynamic vibration absorber from the finite element model of the whole vehicle, and calculate an actual center frequency of the tuned dynamic vibration absorber.
Further, in some optional embodiments of the present invention, the information obtaining module includes:
the test analysis unit is used for carrying out NVH test on the whole vehicle so as to determine the vibration position and the vibration frequency of the whole vehicle;
and the information determining unit is used for determining vibration reduction frequency and vibration reduction position information required by the whole vehicle according to the vibration position and vibration frequency of the whole vehicle.
Further, in some optional embodiments of the present invention, the vibration damping frequency required by the whole vehicle is a frequency range, and the target determining module 12 further includes:
the interval midpoint calculating unit is used for calculating an interval midpoint value of vibration reduction frequency required by the whole vehicle;
and the target determining unit is used for determining the target center frequency of the dynamic vibration absorber according to the interval intermediate value.
Further, in some alternative embodiments of the present invention, the frequency debug module 15 includes:
the frequency debugging unit is used for debugging the mass and/or the bushing rigidity of the dynamic vibration absorber and calculating the center frequency of the debugged dynamic vibration absorber in the whole vehicle state;
the frequency judging unit is used for judging whether the central frequency of the debugged dynamic vibration absorber in the whole vehicle state reaches the target central frequency;
when judging that the central frequency of the debugged dynamic vibration absorber in the whole vehicle state reaches the target central frequency, the frequency determining module 16 separates the finite element model of the debugged dynamic vibration absorber from the finite element model of the whole vehicle, and calculates the actual central frequency of the debugged dynamic vibration absorber; when judging that the central frequency of the debugged power vibration absorber in the whole vehicle state does not reach the target central frequency, the frequency debugging unit debugs the mass and/or the bushing stiffness of the power vibration absorber again, and calculates the central frequency of the newly debugged power vibration absorber in the whole vehicle state until the central frequency of the debugged power vibration absorber in the whole vehicle state reaches the target central frequency.
Further, in some alternative embodiments of the present invention, the frequency determining module 16 includes:
the frequency calculation unit is used for calculating the modal frequency of the finite element model of the debugged dynamic vibration absorber to obtain the actual center frequency of the debugged dynamic vibration absorber.
The functions or operation steps implemented when the above modules and units are executed are substantially the same as those in the above method embodiments, and are not described herein again.
In summary, the device for determining the center frequency of the dynamic vibration absorber in the embodiment of the invention establishes the finite element models of the dynamic vibration absorber and the whole vehicle, assembles the finite element models of the dynamic vibration absorber to the corresponding positions of the finite element models of the whole vehicle according to the vibration reduction positions of the whole vehicle, adjusts the preset parameters of the dynamic vibration absorber to ensure that the center frequency of the dynamic vibration absorber in the whole vehicle state reaches the target center frequency required by the whole vehicle, separates the adjusted finite element models of the dynamic vibration absorber, and calculates the actual center frequency of the adjusted dynamic vibration absorber, so that a manufacturer can just achieve the required target center frequency when the dynamic vibration absorber produced according to the actual center frequency is assembled on the real vehicle, thereby effectively solving the technical problem that the dynamic vibration absorber does not play a role in vibration absorption after being assembled on the real vehicle.
Example IV
In another aspect, referring to fig. 4, a determining apparatus for a center frequency of a dynamic vibration absorber according to a fourth embodiment of the present invention includes a memory 20, a processor 10, and a computer program 30 stored in the memory and capable of running on the processor, where the processor 10 implements the method for determining a center frequency of a dynamic vibration absorber according to the above method when executing the program 30.
The equipment for determining the center frequency of the dynamic vibration absorber can be a computer, an upper computer, NVH test equipment and the like. The processor 10 may in some embodiments be a central processing unit (Central Processing Unit, CPU), a controller, a microcontroller, a microprocessor or other chip for determining the center frequency of the dynamic vibration absorber for running program code or processing data stored in the memory 20, e.g. executing an access restriction program or the like.
The memory 20 includes at least one type of readable storage medium including flash memory, a hard disk, a multimedia card, a card memory (e.g., SD or DX memory, etc.), a magnetic memory, a magnetic disk, an optical disk, etc. The memory 20 may in some embodiments be an internal memory unit of a device for determining the center frequency of the dynamic vibration absorber, such as a hard disk of the device for determining the center frequency of the dynamic vibration absorber. The memory 20 may also be an external storage device of the apparatus for determining the center frequency of the dynamic vibration reducer, for example, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash Card (Flash Card) or the like. Further, the memory 20 may also include both an internal memory unit and an external memory device of the apparatus for determining the center frequency of the dynamic vibration absorber. The memory 20 may be used not only for storing application software and various types of data installed in the determination device of the center frequency of the dynamic vibration absorber, but also for temporarily storing data that has been output or is to be output.
It is noted that the configuration shown in fig. 4 does not constitute a limitation of the determination device of the center frequency of the dynamic vibration absorber, and in other embodiments, the determination device of the center frequency of the dynamic vibration absorber may include fewer or more components than shown, or may combine certain components, or may be a different arrangement of components.
In summary, the device for determining the center frequency of the dynamic vibration absorber in the embodiment of the invention establishes the finite element models of the dynamic vibration absorber and the whole vehicle, assembles the finite element models of the dynamic vibration absorber to the corresponding positions of the finite element models of the whole vehicle according to the vibration reduction positions of the whole vehicle, adjusts the preset parameters of the dynamic vibration absorber to ensure that the center frequency of the dynamic vibration absorber in the whole vehicle state reaches the target center frequency required by the whole vehicle, separates the adjusted finite element models of the dynamic vibration absorber, and calculates the actual center frequency of the adjusted dynamic vibration absorber, so that a manufacturer can just achieve the required target center frequency when the dynamic vibration absorber produced according to the actual center frequency is assembled on the real vehicle, thereby effectively solving the technical problem that the dynamic vibration absorber does not play a role in vibration absorption after being assembled on the real vehicle.
The embodiment of the invention also provides a computer readable storage medium, on which a computer program is stored, which when being executed by a processor, implements the method for determining the center frequency of the dynamic vibration absorber.
Those of skill in the art will appreciate that the logic and/or steps represented in the flow diagrams or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (7)
1. A method for determining a center frequency of a dynamic vibration absorber, the method comprising:
acquiring vibration reduction frequency and vibration reduction position information required by the whole vehicle;
determining a target center frequency of the dynamic vibration absorber according to the vibration reduction frequency required by the whole vehicle;
respectively establishing the dynamic vibration absorber and the finite element model of the whole vehicle;
according to the vibration reduction position information, assembling a finite element model of the dynamic vibration absorber to a corresponding position of the finite element model of the whole vehicle;
debugging preset parameters of the dynamic vibration absorber until the center frequency of the dynamic vibration absorber in the whole vehicle state reaches the target center frequency;
separating the finite element model of the debugged dynamic vibration absorber from the finite element model of the whole vehicle, and calculating the actual center frequency of the debugged dynamic vibration absorber;
the step of debugging preset parameters of the dynamic vibration absorber until the center frequency of the dynamic vibration absorber on the whole vehicle reaches the target center frequency comprises the following steps of:
adjusting the mass and/or the bushing rigidity of the dynamic vibration absorber, and calculating the center frequency of the adjusted dynamic vibration absorber in the whole vehicle state;
judging whether the central frequency of the debugged dynamic vibration absorber in the whole vehicle state reaches the target central frequency;
if yes, executing the step of separating the debugged dynamic vibration absorber from the finite element model of the whole vehicle, and calculating the actual center frequency of the debugged dynamic vibration absorber;
if not, returning to execute the step of debugging the mass and/or the bushing stiffness of the dynamic vibration absorber and calculating the center frequency of the debugged dynamic vibration absorber in the whole vehicle state;
the step of calculating the actual center frequency of the debugged dynamic vibration absorber comprises the following steps:
and calculating the modal frequency of the finite element model of the debugged dynamic vibration absorber to obtain the actual center frequency of the debugged dynamic vibration absorber.
2. The method for determining the center frequency of a dynamic vibration absorber according to claim 1, wherein the step of acquiring vibration damping frequency and vibration damping position information required for the whole vehicle comprises:
NVH test is carried out on the whole vehicle to determine the vibration position and the vibration frequency of the whole vehicle;
and determining vibration damping frequency and vibration damping position information required by the whole vehicle according to the vibration position and vibration frequency of the whole vehicle.
3. The method for determining the center frequency of a dynamic vibration absorber according to claim 1 or 2, wherein the vibration reduction frequency required by the whole vehicle is a frequency interval, and the step of determining the target center frequency of the dynamic vibration absorber according to the vibration reduction frequency required by the whole vehicle comprises:
calculating the interval midpoint value of the vibration reduction frequency required by the whole vehicle;
and determining the target center frequency of the dynamic vibration absorber according to the interval intermediate value.
4. A device for determining a center frequency of a dynamic vibration absorber, the device comprising:
the information acquisition module is used for acquiring vibration reduction frequency and vibration reduction position information required by the whole vehicle;
the target determining module is used for determining the target center frequency of the dynamic vibration absorber according to the vibration reduction frequency required by the whole vehicle;
the model building module is used for respectively building the dynamic vibration absorber and the finite element model of the whole vehicle;
the model assembly module is used for assembling the finite element model of the dynamic vibration absorber to the corresponding position of the finite element model of the whole vehicle according to the vibration reduction position information;
the frequency debugging module is used for debugging preset parameters of the dynamic vibration absorber until the center frequency of the dynamic vibration absorber in the whole vehicle state reaches the target center frequency;
the frequency debugging module comprises:
the frequency debugging unit is used for debugging the mass and/or the bushing rigidity of the dynamic vibration absorber and calculating the center frequency of the debugged dynamic vibration absorber in the whole vehicle state;
the frequency judging unit is used for judging whether the central frequency of the debugged dynamic vibration absorber in the whole vehicle state reaches the target central frequency;
if yes, executing the step of separating the finite element model of the debugged dynamic vibration absorber from the finite element model of the whole vehicle, and calculating the actual center frequency of the debugged dynamic vibration absorber;
if not, returning to execute the step of debugging the mass and/or the bushing stiffness of the dynamic vibration absorber and calculating the center frequency of the debugged dynamic vibration absorber in the whole vehicle state;
the frequency determining module is used for separating the finite element model of the debugged dynamic vibration absorber from the finite element model of the whole vehicle and calculating the actual center frequency of the debugged dynamic vibration absorber;
the frequency determination module includes:
the frequency calculation unit is used for calculating the modal frequency of the finite element model of the debugged dynamic vibration absorber to obtain the actual center frequency of the debugged dynamic vibration absorber.
5. The apparatus according to claim 4, wherein the information acquisition module includes:
the test analysis unit is used for carrying out NVH test on the whole vehicle so as to determine the vibration position and the vibration frequency of the whole vehicle;
and the information determining unit is used for determining vibration reduction frequency and vibration reduction position information required by the whole vehicle according to the vibration position and vibration frequency of the whole vehicle.
6. A computer-readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements a method of determining the center frequency of a dynamic vibration absorber as claimed in any one of claims 1-3.
7. A device for determining the center frequency of a dynamic vibration absorber, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, said processor implementing the method for determining the center frequency of a dynamic vibration absorber according to any one of claims 1-3 when said program is executed.
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