CN112541271B - Method and device for determining noise performance parameters of wiper motor - Google Patents
Method and device for determining noise performance parameters of wiper motor Download PDFInfo
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/10—Noise analysis or noise optimisation
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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
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Abstract
The application discloses a method and a device for determining noise performance parameters of a wiper motor, which at least solve the problems of poor control effect, high cost and long period in the existing wiper motor noise control scheme. The method comprises the following steps: acquiring a target noise value of a wiper motor in a cab of a vehicle and an initial noise performance parameter of the wiper motor, wherein the initial noise performance parameter comprises an initial Noise Transfer Function (NTF) from a mounting point of the wiper motor to the cab of the vehicle and an initial suspension parameter of a suspension device of the wiper motor; determining vibration displacement of the wiper motor at the mounting point based on the target noise value and the initial noise performance parameter; predicting a noise value generated by the wiper motor in the cab based on the vibration displacement; and determining a target noise performance parameter of the wiper motor based on the predicted noise value, the target noise value and the initial noise performance parameter.
Description
Technical Field
The application relates to the technical field of vehicles, in particular to a method and a device for determining noise performance parameters of a wiper motor.
Background
With the development of the vehicle industry, consumers have increasingly higher requirements for riding comfort and sound quality of vehicles. The running noise of the windscreen wiper of the vehicle is one of sound sources during the vehicle is set and the middle and low speed running, and particularly for the electric vehicle, the electric vehicle has no engine, and the set and middle and low speed running has no masking effect of the engine sound, so the windscreen wiper is particularly outstanding. The wiper operation noise mainly comprises impact sound when the wiper blade commutates, friction sound of the wiper blade and wiper motor noise, wherein the frequency range of the wiper motor noise is wider, the sound quality is poorer, and the wiper operation noise is a main constituent component of the wiper system noise, so how to effectively control the wiper motor noise is a problem to be solved urgently at present.
At present, in order to control the noise of a wiper motor, target noise values of the wiper motor are generally set through target analysis or according to experience, and then in the middle and later stages of vehicle development, the wiper system and a vehicle body structure are optimally designed according to the target noise values so as to control the noise of the wiper motor. However, in the above scheme, the control effect on the noise of the wiper motor is poor, and the cost and the period required by the whole process are high.
Disclosure of Invention
The embodiment of the application provides a method and a device for determining noise performance parameters of a wiper motor, which at least solve the problems of poor control effect, high cost and long period in the existing wiper motor noise control scheme.
In order to solve the technical problems, the embodiment of the application adopts the following technical scheme:
according to a first aspect of an embodiment of the present application, there is provided a method for determining a noise performance parameter of a wiper motor, including:
acquiring a target noise value of a wiper motor in a cab of a vehicle and an initial noise performance parameter of the wiper motor, wherein the initial noise performance parameter comprises an initial Noise Transfer Function (NTF) from a mounting point of the wiper motor to the cab of the vehicle and an initial suspension parameter of a suspension device of the wiper motor;
determining vibration displacement of the wiper motor at the mounting point based on the target noise value and the initial noise performance parameter;
predicting a noise value generated by the wiper motor in the cab based on the vibration displacement;
and determining a target noise performance parameter of the wiper motor based on the predicted noise value, the target noise value and the initial noise performance parameter.
Optionally, the determining the target noise performance parameter of the wiper motor based on the predicted noise value, the target noise value, and the initial noise performance parameter includes:
and determining the initial noise performance parameter as a target noise performance parameter of the wiper motor in the case that the predicted noise value does not exceed the target noise value.
Optionally, the determining the target noise performance parameter of the wiper motor based on the predicted noise value, the target noise value, and the initial noise performance parameter further includes:
acquiring NVH performance data of the wiper motor under the condition that the predicted noise value exceeds the target noise value;
correcting the initial noise performance parameter based on the NVH performance data and the vibration displacement of the wiper motor until the noise value generated by the wiper motor in the cab under the noise performance parameter obtained by correction does not exceed the target noise value;
and determining the noise performance parameter obtained by correction as a target noise performance parameter of the wiper motor.
Optionally, the initial suspension parameter includes at least an initial dynamic-static stiffness ratio;
the correcting the initial noise performance parameter based on the NVH performance data and the vibration displacement of the wiper motor includes:
If the NVH performance data meets a preset NVH performance target and the vibration displacement is smaller than a preset displacement threshold, the initial NTF and/or the initial dynamic and static stiffness ratio are increased;
and if the NVH performance data does not meet the preset NVH performance target and the vibration displacement is greater than or equal to the preset displacement threshold, reducing the initial NTF and/or the initial dynamic-static stiffness ratio.
Optionally, the initial suspension parameters include static stiffness and dynamic-to-static stiffness ratio;
the determining, based on the target noise value and the initial noise performance parameter, a vibration displacement of the wiper motor at the mounting point includes:
determining an excitation force of the mounting point based on the target noise value, the initial NTF, and a pre-established noise transfer model;
determining the dynamic stiffness of the suspension device based on the static stiffness and dynamic stiffness ratio of the suspension device;
determining vibration displacement of the wiper motor at the mounting point based on the exciting force of the mounting point, the dynamic stiffness of the suspension device and a pre-established exciting force model;
wherein the noise transmission model is used for indicating the corresponding relation among the exciting force of the mounting point, NTF from the mounting point to the cab and noise value generated by the cab by the wiper motor caused by the exciting force of the mounting point;
The excitation force model is used for indicating the correspondence among the excitation force of the mounting point, the dynamic stiffness of the suspension device and the vibration displacement of the wiper motor at the mounting point.
Optionally, the noise transfer model is specifically:
wherein SPL represents a sound pressure level corresponding to the target noise value, p (e) represents the target noise value, p (ref) represents a reference sound pressure, F represents an exciting force of the mounting point, and N represents a noise transfer function from the mounting point to the cab;
and/or, the excitation force model specifically comprises:
F＝S·K d
wherein S represents the dynamic stiffness of the suspension device; k (K) d And the vibration displacement of the wiper motor at the mounting point is represented.
Optionally, the predicting, based on the vibration displacement, a noise value of the wiper motor at the in-vehicle response point includes:
based on the vibration displacement, determining the model of the wiper motor and acquiring the working parameters of the wiper motor with the selected model number;
and carrying out simulation analysis on the working process of the wiper motor based on the working parameters of the wiper motor with the selected model and a pre-established simulation analysis model so as to obtain the noise value generated by the wiper motor in the cab.
According to a second aspect of the embodiment of the present application, there is provided a noise performance parameter determining apparatus of a wiper motor, including:
the device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring a target noise value of a wiper motor in a cab of a vehicle and an initial noise performance parameter of the wiper motor, wherein the initial noise performance parameter comprises an initial Noise Transfer Function (NTF) from a mounting point of the wiper motor in the vehicle to the cab and an initial suspension parameter of a suspension device of the wiper motor;
the vibration displacement determining module is used for determining the vibration displacement of the wiper motor at the mounting point based on the target noise value and the initial noise performance parameter;
the noise prediction module is used for predicting a noise value generated by the wiper motor in the cab based on the vibration displacement;
and the performance parameter determining module is used for determining the target noise performance parameter of the wiper motor based on the predicted noise value, the target noise value and the initial noise performance parameter.
Optionally, the performance parameter determining module includes:
and the first performance parameter determining submodule is used for determining the initial noise performance parameter as the target noise performance parameter of the wiper motor under the condition that the predicted noise value does not exceed the target noise value.
Optionally, the performance parameter determining module further includes:
the NVH performance data acquisition sub-module is used for acquiring NVH performance data of the wiper motor under the condition that the predicted noise value exceeds the target noise value;
the correction sub-module is used for correcting the initial noise performance parameter based on the NVH performance data and the vibration displacement of the wiper motor until the noise value generated by the wiper motor in the cab under the noise performance parameter obtained by correction does not exceed the target noise value;
and the second performance parameter determining submodule is used for determining the noise performance parameter obtained through correction as the target noise performance parameter of the wiper motor.
Optionally, the initial suspension parameter includes at least an initial dynamic-static stiffness ratio;
the correction submodule is specifically used for:
if the NVH performance data meets a preset NVH performance target and the vibration displacement is smaller than a preset displacement threshold, the initial NTF and/or the initial dynamic and static stiffness ratio are increased;
and if the NVH performance data does not meet the preset NVH performance target and the vibration displacement is greater than or equal to the preset displacement threshold, reducing the initial NTF and/or the initial dynamic-static stiffness ratio.
Optionally, the initial suspension parameters include static stiffness and dynamic-to-static stiffness ratio;
the vibration displacement determination module includes:
an excitation force determination sub-module for determining an excitation force of the mounting point based on the target noise value, the initial NTF, and a pre-established noise transfer model;
the dynamic stiffness determination submodule is used for determining the dynamic stiffness of the suspension device based on the static stiffness and the dynamic stiffness ratio of the suspension device;
the vibration displacement determining submodule is used for determining the vibration displacement of the wiper motor at the mounting point based on the exciting force of the mounting point, the dynamic stiffness of the suspension device and a pre-established exciting force model;
wherein the noise transmission model is used for indicating the corresponding relation among the exciting force of the mounting point, NTF from the mounting point to the cab and noise value generated by the cab by the wiper motor caused by the exciting force of the mounting point;
the excitation force model is used for indicating the correspondence among the excitation force of the mounting point, the dynamic stiffness of the suspension device and the vibration displacement of the wiper motor at the mounting point.
Optionally, the noise transfer model is specifically:
Wherein SPL represents a sound pressure level corresponding to the target noise value, p (e) represents the target noise value, p (ref) represents a reference sound pressure, F represents an exciting force of the mounting point, and N represents a noise transfer function from the mounting point to the cab;
and/or, the excitation force model specifically comprises:
F＝S·K d
wherein S represents the dynamic stiffness of the suspension device; k (K) d And the vibration displacement of the wiper motor at the mounting point is represented.
Optionally, the noise prediction module includes:
the type selecting sub-module is used for determining the type of the wiper motor based on the vibration displacement and acquiring the working parameters of the wiper motor with the selected type number;
and the simulation analysis sub-module is used for carrying out simulation analysis on the working process of the wiper motor based on the working parameters of the wiper motor of the selected model and a pre-established simulation analysis model so as to obtain the noise value generated by the wiper motor in the cab.
According to a third aspect of the embodiment of the present application, there is provided a noise performance parameter determining apparatus of a wiper motor, including: a memory, a processor and a computer program stored on the memory and executable on the processor, which when executed by the processor implements the method according to the first aspect.
According to a fourth aspect of embodiments of the present application, there is provided a computer readable storage medium having stored thereon a computer program which, when executed by an electronic device, implements the method according to the first aspect.
The above at least one technical scheme adopted by the embodiment of the application can achieve the following beneficial effects:
the method comprises the steps of obtaining a target noise value of a wiper motor in a cab of a vehicle and initial noise performance parameters including an initial noise transfer function and initial suspension parameters of a suspension device, determining vibration displacement of the wiper motor at a mounting point based on the target noise value and the initial noise performance parameters, predicting a noise value generated by the wiper motor in the cab based on the vibration displacement, determining the target noise performance parameters based on the predicted noise value, the target noise value and the initial noise performance parameters, determining the characteristics that noise of the wiper motor is mainly transmitted into the cab through a vehicle body structure path in the whole determining process, analyzing the vehicle body structure path on the basis of the target noise value to determine the target noise performance parameters of the wiper motor. In addition, after the target noise performance parameter of the wiper motor is determined, the vehicle body structure and the suspension device of the vehicle can be matched and designed based on the target noise performance parameter, so that the change of the vehicle body structure and the repeated debugging of the suspension device in a later physical sample vehicle stage are avoided, the part correction cost is further reduced, and the vehicle development period is shortened.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
fig. 1 is a schematic structural view of a wiper system according to an embodiment of the present application;
fig. 2 is a flowchart of a method for determining a noise performance parameter of a wiper motor according to an embodiment of the present application;
FIG. 3A is a schematic diagram of a target noise value in the form of an A-weighted sound level according to an embodiment of the present application;
FIG. 3B is a schematic diagram of a target noise value in the form of an un-weighted sound level according to an embodiment of the present application;
FIG. 3C is a schematic diagram of an initial noise transfer function according to an embodiment of the present application;
FIG. 3D is a schematic illustration of the energizing force of a mounting point provided by an embodiment of the present application;
fig. 3E is a schematic diagram of vibration displacement of a wiper motor at a mounting point according to an embodiment of the present application;
fig. 4 is a flowchart of another method for determining a noise performance parameter of a wiper motor according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present application;
Fig. 6 is a schematic structural diagram of a device for determining noise performance parameters of a wiper motor according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments of the present application and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The following describes in detail the technical solutions provided by the embodiments of the present application with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a wiper system according to an embodiment of the present application, where the wiper system includes a wiper 1, a wiper motor 2, and a suspension device 3. Wherein the wiper motor 2 is fixed on the suspension device 3, and the wiper motor 2 is connected with the wiper 1 to drive the wiper 1 to work. The wiper motor 2 generates noise (hereinafter referred to as "wiper motor noise") during operation, and the wiper motor noise is transmitted from the wiper motor 2 to the vehicle cabin at the mounting point of the vehicle via a medium such as the vehicle body of the vehicle, thereby forming in-vehicle noise. Such noise is particularly prominent when the vehicle is stationary or traveling at low speeds, and particularly when the electric vehicle is free of masking effects of engine sounds. Therefore, how to effectively control the noise of the wiper motor is a current problem to be solved.
In this regard, the embodiment of the application provides a method for determining noise performance parameters of a wiper motor, which achieves the purpose of effectively controlling the noise of the wiper motor by reasonably setting the noise performance parameters. The technical scheme provided by the embodiment of the application is described in detail through specific embodiments.
Referring to fig. 2, fig. 2 is a flowchart of a method for determining a noise performance parameter of a wiper motor according to an embodiment of the present application, where the method may be applied to, but not limited to, an electronic device, and may be specifically executed by software and/or hardware installed in the electronic device. As shown in fig. 2, the method comprises the steps of:
s210, acquiring a target noise value of the wiper motor in a cab of the vehicle and an initial noise performance parameter of the wiper motor, wherein the initial noise performance parameter comprises an initial noise transfer function from a mounting point of the wiper motor in the vehicle to the cab and an initial suspension parameter of a suspension device of the wiper motor.
The target noise value may be preset according to a vehicle model and an in-vehicle noise industry standard of the vehicle. In particular, it is contemplated that the vehicle industry will typically employ weighting levels to represent noise, and that the target noise value may be represented in terms of an A weighting level in order to more closely approximate the human ear structure. For example, a target noise value in the form of an A-weighted sound level is shown in FIG. 3A, where the frequency range of the target noise value is 0-2000 Hz.
Of course, the set value of the target noise value may also be represented in the form of an unweighted sound level, as shown in fig. 3B. In this case, the above-described target noise value expressed in the form of an a-weighted sound level can be converted into the form of an unweighted sound level by the following formula (1) according to the JJG 188-2002 sound level meter verification procedure.
Wherein A (f) represents a target noise value expressed in terms of A weighting sound level corresponding to a frequency f, f 1 ＝20.6Hz，f 2 ＝107.7Hz，f 3 ＝737.9Hz，f 4 ＝12194Hz，A 1000 ＝-2.000dB。
The noise performance parameter of the wiper motor refers to a parameter that affects the magnitude of noise value generated by the wiper motor in the cab of the vehicle. The noise performance parameters of the wiper motor may include, in particular, a noise transfer function (Noise Transfer Function, NTF) from the mounting point of the wiper motor to the cab of the vehicle and suspension parameters of the suspension device, considering that the magnitude of the noise value generated by the wiper motor at the cab of the vehicle is influenced by the noise transfer path from the mounting point of the wiper system to the cab of the vehicle and the suspension parameters of the suspension device for fixing the wiper motor.
The initial noise performance parameter of the wiper motor refers to a preset noise performance parameter, so that the initial noise performance parameter of the wiper motor comprises an initial NTF from a mounting point of the wiper motor to a cab of a vehicle and an initial suspension parameter of a suspension device, and the initial noise performance parameter can be specifically set according to actual requirements.
The NTF is a physical quantity for measuring noise transmission performance of a vehicle body structure, belongs to one of important indexes of NVH (Noise, vibration, harshness, noise, vibration and harshness) performance of the vehicle body, and is used for describing the noise level in a cab caused by transmission of exciting force of the mounting point to the cab through the vehicle body structure. Specifically, the NTF may be set according to one or more of the vehicle model, NVH performance positioning, body weight, and cost, for example, fig. 3C shows an example of an initial NTF, i.e., an NTF constant at 55dB/N over the frequency range 0-2000 Hz.
The suspension parameters of the suspension device refer to parameters for describing suspension performance of the suspension device, and specifically may include, but are not limited to, static stiffness of the suspension device, which is used for representing the ability of the suspension device to resist deformation under static excitation force, dynamic stiffness of the suspension device, which is used for representing the ability of the suspension device to resist deformation under dynamic excitation force, dynamic stiffness of the suspension device, and dynamic stiffness of the suspension device, which is a ratio between dynamic stiffness of the suspension device and dynamic stiffness of the suspension device.
Specifically, the static stiffness of the suspension device may be determined according to the mass, working torque, arrangement, size, etc. of the wiper motor, and for example, the initial static stiffness Ks of the suspension device may be set to 500N/mm. The dynamic-to-static stiffness ratio of the suspension may be determined according to the technical capabilities of the provider of the suspension, for example, the initial dynamic-to-static stiffness ratio Kd/Ks of the suspension may be set to 1.5.
S220, determining vibration displacement of the wiper motor at the mounting point based on the target noise value and the initial noise performance parameter.
Since the NTF from the mounting point of the wiper motor at the vehicle to the cab describes the magnitude of noise in the cab caused by the transmission of the exciting force of the mounting point to the cab, the corresponding relationship between the above-described NTF, exciting force of the mounting point, and magnitude of noise generated by the wiper motor at the cab can be established in advance, a noise transmission model can be obtained, and since the dynamic stiffness of the suspension describes the ability of the suspension to resist deformation under dynamic exciting force, the corresponding relationship between the dynamic stiffness of the suspension, exciting force of the mounting point, and vibration displacement generated by the wiper motor at the mounting point can be established in advance, an exciting force model can be obtained, and further the vibration displacement generated by the wiper motor at the mounting point under the initial noise performance parameters can be determined based on the above-described noise transmission model and exciting force model.
Specifically, as shown in fig. 4, step S220 may include:
s221, determining an excitation force of the mounting point based on the target noise value, the initial NTF, and a noise transfer model established in advance.
Wherein the noise transmission model is used for indicating the correspondence between the exciting force of the mounting point, the NTF from the mounting point to the cab and the noise value generated by the windshield wiper motor at the cab caused by the exciting force of the mounting point. Alternatively, the noise transfer model is specifically as shown in the following formula (2).
Wherein SPL represents a sound pressure level corresponding to the target noise value, p (e) represents the target noise value, p (ref) represents a reference sound pressure, F represents an exciting force of the mounting point, and N represents an NTF from the mounting point to the cab.
For example, taking the target noise value represented in the form of the non-weighted sound level shown in fig. 3B and the initial NTF shown in fig. 3C as an example, the excitation force of the mounting point is obtained based on the above-described noise transfer model as shown in fig. 3D.
S222, determining the dynamic stiffness of the suspension device based on the static stiffness and the dynamic stiffness ratio of the suspension device.
Specifically, the product of the static stiffness and the dynamic stiffness ratio of the suspension device can be determined as the dynamic stiffness of the suspension device.
S223, determining vibration displacement of the wiper motor at the mounting point based on the exciting force of the mounting point, the dynamic stiffness of the suspension device and a pre-established exciting force model.
The exciting force model is used for indicating the corresponding relation among exciting force of the mounting point, dynamic stiffness of the suspension device and vibration displacement of the wiper motor at the mounting point. Alternatively, the excitation force model may be specifically as shown in the following formula (3).
F＝S·K d (3)
Wherein K is d Representing the dynamic stiffness of the suspension; s represents the vibration displacement of the wiper motor at the mounting point.
For example, taking the static stiffness ks=500N/mm and the dynamic stiffness ratio of 1.5 of the suspension device as an example, the dynamic stiffness kd=700N/mm of the suspension device can be obtained, and the dynamic stiffness and the excitation force of the installation point shown in fig. 3D are input into the excitation force model, so that the vibration displacement of the wiper motor at the installation point shown in fig. 3E can be obtained.
It can be understood that the determined vibration displacement of the wiper motor at the mounting point is more accurate and has higher efficiency by utilizing the corresponding relation among the exciting force of the mounting point, the NTF and the noise value generated by the wiper motor in the cab and the corresponding relation among the exciting force of the mounting point, the dynamic stiffness of the suspension device and the vibration displacement.
S230, predicting the noise value generated by the wiper motor in the cab based on the vibration displacement of the wiper motor at the mounting point.
Since the vibration displacement of the wiper motor at the mounting point is different, the noise value generated in the cab is different, and thus, after the vibration displacement of the wiper motor at the mounting point is obtained based on the above step S220, the noise value generated in the cab by the wiper motor is predicted based on the vibration displacement.
Specifically, first, the type of the wiper motor may be selected based on the vibration displacement of the wiper motor at the mounting point, for example, the vibration displacement of the wiper motor at the mounting point is taken as a vibration displacement target, candidate motors whose vibration performance can meet the vibration displacement target are selected based on the respective vibration performance of the candidate motors of different types, and are taken as wiper motors to be adopted and determined; and then, simulating the working process of the wiper motor by the working parameters of the wiper motor of the selected model and a pre-established simulation model to obtain the noise value generated by the wiper motor in the cab.
The operating parameters of the wiper motor may include, for example, but not limited to, a rated power, a rated voltage, a rated rotational speed, an idle rotational speed, a rated torque, a rated current, a maximum allowable rotational speed, a motor efficiency, and the like of the wiper motor. The simulation analysis model can simulate the operation process of the wiper motor at the mounting point of the vehicle, therefore, the operation parameters of the wiper motor in the simulation analysis model are set to be the operation parameters of the wiper motor of the selected model, the operation process of the wiper motor of the selected model at the mounting point of the vehicle can be simulated through the simulation analysis model, and the noise value generated by the wiper motor of the selected model in the cab can be obtained.
It can be understood that in the above embodiment, the wiper motor is firstly selected based on the determined vibration displacement, then the operation process of the wiper motor at the mounting point of the vehicle is simulated based on the working parameters of the wiper motor with the selected type number and a pre-established simulation analysis model, and further the noise value generated by the wiper motor at the cab of the vehicle can be accurately predicted, the whole scheme does not need to carry out a real vehicle test, and the period is short and the cost is low.
Of course, in other alternative solutions, a sample vehicle test manner may also be adopted, and the above prediction result of the noise value generated by the wiper motor in the cab of the vehicle is obtained by mounting the wiper motor of the selected model on the sample vehicle and collecting the noise value generated by the wiper motor in the cab of the sample vehicle. Alternatively, in other alternatives, other prediction methods commonly used in the art may be used to predict the noise level generated by the wiper motor in the cab of the vehicle.
S240, determining target noise performance parameters of the wiper motor based on the predicted noise value, the target noise value and the initial noise performance parameters of the wiper motor.
The target noise performance parameter of the wiper motor refers to the finally determined noise performance parameter of the wiper motor, namely the target noise performance parameter of the wiper motor comprises a target noise transfer function from a mounting point of the wiper motor to a cab of a vehicle and a target suspension parameter of a suspension device of the wiper motor.
Specifically, as shown in fig. 4, the step S240 may include:
s241, it is determined whether the predicted noise value exceeds the target noise value.
If the determination result is no, it may be determined that the noise performance of the wiper motor is superior at this time, and in this case, the following step S242 may be performed.
S242, determining the initial noise performance parameter of the wiper motor as the target noise performance parameter of the wiper motor.
Further, in the step S241, if the determination result is no, it may be determined that the noise performance of the wiper motor is still to be improved, and in this case, the initial noise performance parameter of the wiper motor may be corrected until the predicted noise value does not exceed the target noise value. Specifically, in the case where the determination result is no, the following steps S243 to S245 may be performed.
S243, NVH performance data of the wiper motor is acquired.
The NVH performance data of the wiper motor refer to data used for representing NVH performance of the wiper motor, and the NVH performance data can be obtained by conducting NVH performance test on the wiper motor.
S244, correcting the initial noise performance parameter of the wiper motor based on the NVH performance data of the wiper motor and the vibration displacement at the mounting point until the noise value generated by the wiper motor in the cab under the noise performance parameter obtained by correction does not exceed the target noise value.
Specifically, if the NVH performance data of the wiper motor meets the preset NVH performance target and the vibration displacement of the wiper motor at the mounting point is smaller than the preset displacement threshold, the requirements on the NTF and/or the dynamic-static stiffness ratio can be appropriately reduced, that is, the initial NTF is increased, so as to achieve the purpose of reducing the weight of the vehicle body, and/or the initial dynamic-static stiffness ratio is reduced, so as to achieve the purpose of reducing the cost of the suspension device. For example, if the initial NTF is 55dB, then the NTF may be modified to 53dB; if the initial dynamic and static stiffness ratio is 1.5, the dynamic and static stiffness ratio can be corrected to 2.0.
If the NVH performance data of the wiper motor does not meet the preset NVH performance target and the vibration displacement of the wiper motor at the mounting point is larger than or equal to the preset displacement threshold, the requirements on the NTF and/or the dynamic and static stiffness ratio can be properly improved, and the initial NTF and/or the initial dynamic and static stiffness ratio is reduced. For example, if the initial NTF is 55dB, then the NTF may be modified to 58dB; if the initial dynamic and static stiffness ratio is 1.5, the dynamic and static stiffness ratio can be modified to 1.4.
More specifically, after correcting the initial noise performance parameter of the wiper motor, the steps S220 to S230 may be repeatedly performed, and if the predicted noise value does not exceed the target noise value, the correction of the initial noise performance parameter of the wiper motor is stopped; otherwise, repeating the above steps until the predicted noise value does not exceed the target value.
It can be understood that the initial noise performance parameter of the wiper motor is corrected based on the NVH performance data of the wiper motor and the vibration displacement at the mounting point, so that the noise performance parameter is corrected by fully considering the NVH performance of the wiper motor, the vehicle body structure, the cost of the suspension device and the like, and the relation among a plurality of targets such as the NVH performance of the wiper motor, the vehicle body structure, the cost of the suspension device and the like can be balanced based on the obtained target noise performance parameter on the basis of effectively controlling the noise of the wiper motor.
S245, determining the noise performance parameter obtained through correction as a target noise performance parameter of the wiper motor.
It can be understood that through the above scheme, under the condition that the predicted noise value exceeds the target noise value, the initial noise performance parameter of the wiper motor is corrected until the predicted noise value does not exceed the target noise value, and the noise performance parameter of the wiper motor can be effectively controlled in the early development stage of the vehicle so as to effectively control the noise of the wiper motor, thereby avoiding the change of the vehicle body structure and the repeated debugging of the suspension device in the later development stage of the vehicle, such as the physical model stage, further reducing the part correction cost in the later development stage of the vehicle and improving the efficiency of the vehicle development project.
According to the method for determining the noise performance parameter of the wiper motor, the target noise value of the wiper motor in the cab of the vehicle and the initial noise performance parameter including the initial noise transfer function and the initial suspension parameter of the suspension device are obtained, vibration displacement of the wiper motor at the mounting point is determined based on the target noise value and the initial noise performance parameter, then the noise value generated by the wiper motor in the cab is predicted based on the vibration displacement, finally the target noise performance parameter is determined based on the predicted noise value, the target noise value and the initial noise performance parameter, the whole determining process is based on the characteristic that the noise of the wiper motor is mainly transmitted into the cab through the vehicle body structure path, the target noise performance parameter of the wiper motor is determined on the basis of the target noise value by analyzing the vehicle body structure path, compared with the scheme in the prior art, the noise of the wiper motor can be effectively controlled in early stage of vehicle development, the vehicle body structure, the wiper system and the like do not need to be rectified and repeatedly debugged in the middle and later stage of development, and the whole process is low in cost and short in period. In addition, after the target noise performance parameter of the wiper motor is determined, the vehicle body structure and the suspension device of the vehicle can be matched and designed based on the target noise performance parameter, so that the change of the vehicle body structure and the repeated debugging of the suspension device in a later physical sample vehicle stage are avoided, the part correction cost is further reduced, and the vehicle development period is shortened.
The foregoing describes specific embodiments of the present disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims can be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
Fig. 5 is a schematic structural view of an electronic device according to an embodiment of the present application. Referring to fig. 5, at the hardware level, the electronic device includes a processor, and optionally an internal bus, a network interface, and a memory. The Memory may include a Memory, such as a Random-Access Memory (RAM), and may further include a non-volatile Memory (non-volatile Memory), such as at least 1 disk Memory. Of course, the electronic device may also include hardware required for other services.
The processor, network interface, and memory may be interconnected by an internal bus, which may be an ISA (Industry Standard Architecture ) bus, a PCI (Peripheral Component Interconnect, peripheral component interconnect standard) bus, or EISA (Extended Industry Standard Architecture ) bus, among others. The buses may be classified as address buses, data buses, control buses, etc. For ease of illustration, only one bi-directional arrow is shown in FIG. 5, but not only one bus or type of bus.
And the memory is used for storing programs. In particular, the program may include program code including computer-operating instructions. The memory may include memory and non-volatile storage and provide instructions and data to the processor.
The processor reads the corresponding computer program from the nonvolatile memory to the memory and then runs the computer program to form the noise performance parameter determining device of the wiper motor on a logic level. The processor is used for executing the programs stored in the memory and is specifically used for executing the following operations:
acquiring a target noise value of a wiper motor in a cab of a vehicle and an initial noise performance parameter of the wiper motor, wherein the initial noise performance parameter comprises an initial Noise Transfer Function (NTF) from a mounting point of the wiper motor to the cab of the vehicle and an initial suspension parameter of a suspension device of the wiper motor;
determining vibration displacement of the wiper motor at the mounting point based on the target noise value and the initial noise performance parameter;
predicting a noise value generated by the wiper motor in the cab based on the vibration displacement;
and determining a target noise performance parameter of the wiper motor based on the predicted noise value, the target noise value and the initial noise performance parameter.
The method executed by the noise performance parameter determining apparatus of a wiper motor according to the embodiment of fig. 2 of the present application may be applied to a processor or implemented by the processor. The processor may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or by instructions in the form of software. The processor may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), etc.; but also digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be embodied directly in the execution of a hardware decoding processor, or in the execution of a combination of hardware and software modules in a decoding processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method.
The electronic device may further execute the method of fig. 2, and implement the functions of the device for determining the noise performance parameter of the wiper motor in the embodiments shown in fig. 2 and fig. 4, which are not described herein again.
Of course, other implementations, such as a logic device or a combination of hardware and software, are not excluded from the electronic device of the present application, that is, the execution subject of the following processing flows is not limited to each logic unit, but may be hardware or a logic device.
The embodiments of the present application also provide a computer-readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a portable electronic device comprising a plurality of application programs, enable the portable electronic device to perform the method of the embodiment of fig. 2, and in particular to perform the operations of:
acquiring a target noise value of a wiper motor in a cab of a vehicle and an initial noise performance parameter of the wiper motor, wherein the initial noise performance parameter comprises an initial Noise Transfer Function (NTF) from a mounting point of the wiper motor to the cab of the vehicle and an initial suspension parameter of a suspension device of the wiper motor;
Determining vibration displacement of the wiper motor at the mounting point based on the target noise value and the initial noise performance parameter;
predicting a noise value generated by the wiper motor in the cab based on the vibration displacement;
and determining a target noise performance parameter of the wiper motor based on the predicted noise value, the target noise value and the initial noise performance parameter.
Fig. 6 is a schematic structural diagram of a device for determining noise performance parameters of a wiper motor according to an embodiment of the present application. Referring to fig. 6, in a software implementation, the noise performance parameter determining apparatus 600 may include:
an obtaining module 610, configured to obtain a target noise value of a wiper motor in a cab of a vehicle and an initial noise performance parameter of the wiper motor, where the initial noise performance parameter includes an initial noise transfer function NTF from a mounting point of the wiper motor at the vehicle to the cab and an initial suspension parameter of a suspension device of the wiper motor;
a vibration displacement determination module 620, configured to determine a vibration displacement of the wiper motor at the mounting point based on the target noise value and the initial noise performance parameter;
A noise prediction module 630, configured to predict a noise value generated by the wiper motor in the cab based on the vibration displacement;
a performance parameter determination module 640, configured to determine a target noise performance parameter of the wiper motor based on the predicted noise value, the target noise value, and the initial noise performance parameter.
Optionally, the performance parameter determining module includes:
and the first performance parameter determining submodule is used for determining the initial noise performance parameter as the target noise performance parameter of the wiper motor under the condition that the predicted noise value does not exceed the target noise value.
Optionally, the performance parameter determining module further includes:
the NVH performance data acquisition sub-module is used for acquiring NVH performance data of the wiper motor under the condition that the predicted noise value exceeds the target noise value;
the correction sub-module is used for correcting the initial noise performance parameter based on the NVH performance data and the vibration displacement of the wiper motor until the noise value generated by the wiper motor in the cab under the noise performance parameter obtained by correction does not exceed the target noise value;
and the second performance parameter determining submodule is used for determining the noise performance parameter obtained through correction as the target noise performance parameter of the wiper motor.
Optionally, the initial suspension parameter includes at least an initial dynamic-static stiffness ratio;
the correction submodule is specifically used for:
if the NVH performance data meets a preset NVH performance target and the vibration displacement is smaller than a preset displacement threshold, the initial NTF and/or the initial dynamic and static stiffness ratio are increased;
and if the NVH performance data does not meet the preset NVH performance target and the vibration displacement is greater than or equal to the preset displacement threshold, reducing the initial NTF and/or the initial dynamic-static stiffness ratio.
Optionally, the initial suspension parameters include static stiffness and dynamic-to-static stiffness ratio;
the vibration displacement determination module includes:
an excitation force determination sub-module for determining an excitation force of the mounting point based on the target noise value, the initial NTF, and a pre-established noise transfer model;
the dynamic stiffness determination submodule is used for determining the dynamic stiffness of the suspension device based on the static stiffness and the dynamic stiffness ratio of the suspension device;
the vibration displacement determining submodule is used for determining the vibration displacement of the wiper motor at the mounting point based on the exciting force of the mounting point, the dynamic stiffness of the suspension device and a pre-established exciting force model;
Wherein the noise transmission model is used for indicating the corresponding relation among the exciting force of the mounting point, NTF from the mounting point to the cab and noise value generated by the cab by the wiper motor caused by the exciting force of the mounting point;
the excitation force model is used for indicating the correspondence among the excitation force of the mounting point, the dynamic stiffness of the suspension device and the vibration displacement of the wiper motor at the mounting point.
Optionally, the noise transfer model is specifically:
wherein SPL represents a sound pressure level corresponding to the target noise value, p (e) represents the target noise value, p (ref) represents a reference sound pressure, F represents an exciting force of the mounting point, and N represents a noise transfer function from the mounting point to the cab;
and/or, the excitation force model specifically comprises:
F＝S·K d
wherein S represents the dynamic stiffness of the suspension device; k (K) d And the vibration displacement of the wiper motor at the mounting point is represented.
Optionally, the noise prediction module includes:
the type selecting sub-module is used for determining the type of the wiper motor based on the vibration displacement and acquiring the working parameters of the wiper motor with the selected type number;
And the simulation analysis sub-module is used for carrying out simulation analysis on the working process of the wiper motor based on the working parameters of the wiper motor of the selected model and a pre-established simulation analysis model so as to obtain the noise value generated by the wiper motor in the cab.
According to the device for determining the noise performance parameter of the wiper motor, provided by the embodiment of the application, the target noise value of the wiper motor in the cab of the vehicle and the initial noise performance parameter comprising the initial noise transfer function and the initial suspension parameter of the suspension device are obtained, the vibration displacement of the wiper motor at the mounting point is determined based on the target noise value and the initial noise performance parameter, then the noise value generated by the wiper motor in the cab is predicted based on the vibration displacement, finally the target noise performance parameter is determined based on the predicted noise value, the target noise value and the initial noise performance parameter, the whole determining process is based on the characteristic that the noise of the wiper motor is mainly transmitted into the cab through the vehicle body structure path, and the target noise performance parameter of the wiper motor is determined by analyzing the vehicle body structure path on the basis of the target noise value. In addition, after the target noise performance parameter of the wiper motor is determined, the vehicle body structure and the suspension device of the vehicle can be matched and designed based on the target noise performance parameter, so that the change of the vehicle body structure and the repeated debugging of the suspension device in a later physical sample vehicle stage are avoided, the part correction cost is further reduced, and the vehicle development period is shortened.
In summary, the foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
The system, apparatus, module or unit set forth in the above embodiments may be implemented in particular by a computer chip or entity, or by a product having a certain function. One typical implementation is a computer. In particular, the computer may be, for example, a personal computer, a laptop computer, a cellular telephone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments.
Claims (8)
1. A method for determining a noise performance parameter of a wiper motor, comprising:
acquiring a target noise value of a wiper motor in a cab of a vehicle and an initial noise performance parameter of the wiper motor, wherein the initial noise performance parameter comprises an initial Noise Transfer Function (NTF) from a mounting point of the wiper motor to the cab of the vehicle and an initial suspension parameter of a suspension device of the wiper motor;
Determining vibration displacement of the wiper motor at the mounting point based on the target noise value and the initial noise performance parameter;
predicting a noise value generated by the wiper motor in the cab based on the vibration displacement;
determining a target noise performance parameter of the wiper motor based on the predicted noise value, the target noise value, and the initial noise performance parameter;
the determining the target noise performance parameter of the wiper motor based on the predicted noise value, the target noise value, and the initial noise performance parameter includes:
determining the initial noise performance parameter as a target noise performance parameter of the wiper motor in the case that the predicted noise value does not exceed the target noise value;
the determining the target noise performance parameter of the wiper motor based on the predicted noise value, the target noise value, and the initial noise performance parameter further includes:
acquiring NVH performance data of the wiper motor under the condition that the predicted noise value exceeds the target noise value;
correcting the initial noise performance parameter based on the NVH performance data and the vibration displacement of the wiper motor until the noise value generated by the wiper motor in the cab under the noise performance parameter obtained by correction does not exceed the target noise value;
And determining the noise performance parameter obtained by correction as a target noise performance parameter of the wiper motor.
2. The method of claim 1, wherein the initial suspension parameters include at least an initial dynamic-static stiffness ratio;
the correcting the initial noise performance parameter based on the NVH performance data and the vibration displacement of the wiper motor includes:
if the NVH performance data meets a preset NVH performance target and the vibration displacement is smaller than a preset displacement threshold, the initial NTF and/or the initial dynamic and static stiffness ratio are increased;
and if the NVH performance data does not meet the preset NVH performance target and the vibration displacement is greater than or equal to the preset displacement threshold, reducing the initial NTF and/or the initial dynamic-static stiffness ratio.
3. The method of claim 1, wherein the initial suspension parameters include static stiffness and dynamic to static stiffness ratio;
the determining, based on the target noise value and the initial noise performance parameter, a vibration displacement of the wiper motor at the mounting point includes:
determining an excitation force of the mounting point based on the target noise value, the initial NTF, and a pre-established noise transfer model;
Determining the dynamic stiffness of the suspension device based on the static stiffness and dynamic stiffness ratio of the suspension device;
determining vibration displacement of the wiper motor at the mounting point based on the exciting force of the mounting point, the dynamic stiffness of the suspension device and a pre-established exciting force model;
wherein the noise transmission model is used for indicating the corresponding relation among the exciting force of the mounting point, NTF from the mounting point to the cab and noise value generated by the cab by the wiper motor caused by the exciting force of the mounting point;
the excitation force model is used for indicating the correspondence among the excitation force of the mounting point, the dynamic stiffness of the suspension device and the vibration displacement of the wiper motor at the mounting point.
4. A method according to claim 3, characterized in that the noise transfer model is in particular:
wherein,representing the sound pressure level corresponding to the target noise value,/->Representing the target noise value,/->Represents a reference sound pressure +.>Represents the energizing force of said mounting point, +.>Representing a noise transfer function from the mounting point to the cab;
and/or, the excitation force model specifically comprises:
Wherein,representing the dynamic stiffness of the suspension; />And the vibration displacement of the wiper motor at the mounting point is represented.
5. The method of claim 1, wherein predicting a noise value of the wiper motor at the cab response point based on the vibration displacement comprises:
based on the vibration displacement, determining the model of the wiper motor and acquiring the working parameters of the wiper motor with the selected model number;
and carrying out simulation analysis on the working process of the wiper motor based on the working parameters of the wiper motor with the selected model and a pre-established simulation analysis model so as to obtain the noise value generated by the wiper motor in the cab.
6. A noise performance parameter determining apparatus of a wiper motor, comprising:
the device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring a target noise value of a wiper motor in a cab of a vehicle and an initial noise performance parameter of the wiper motor, wherein the initial noise performance parameter comprises an initial Noise Transfer Function (NTF) from a mounting point of the wiper motor in the vehicle to the cab and an initial suspension parameter of a suspension device of the wiper motor;
the vibration displacement determining module is used for determining the vibration displacement of the wiper motor at the mounting point based on the target noise value and the initial noise performance parameter;
The noise prediction module is used for predicting a noise value generated by the wiper motor in the cab based on the vibration displacement;
the performance parameter determining module is used for determining a target noise performance parameter of the wiper motor based on the predicted noise value, the target noise value and the initial noise performance parameter, and is specifically used for:
determining the initial noise performance parameter as a target noise performance parameter of the wiper motor in the case that the predicted noise value does not exceed the target noise value;
acquiring NVH performance data of the wiper motor under the condition that the predicted noise value exceeds the target noise value; correcting the initial noise performance parameter based on the NVH performance data and the vibration displacement of the wiper motor until the noise value generated by the wiper motor in the cab under the noise performance parameter obtained by correction does not exceed the target noise value; and determining the noise performance parameter obtained by correction as a target noise performance parameter of the wiper motor.
7. An electronic device, comprising: memory, a processor and a computer program stored on the memory and executable on the processor, which when executed by the processor implements the method of any one of claims 1 to 5.
8. A computer readable storage medium, characterized in that it has stored thereon a computer program which, when executed by an electronic device, implements the method according to any of claims 1 to 5.
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