CN111783221A - Road noise calculation method based on chassis attachment point force - Google Patents
Road noise calculation method based on chassis attachment point force Download PDFInfo
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- CN111783221A CN111783221A CN202010482609.2A CN202010482609A CN111783221A CN 111783221 A CN111783221 A CN 111783221A CN 202010482609 A CN202010482609 A CN 202010482609A CN 111783221 A CN111783221 A CN 111783221A
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- 238000004364 calculation method Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 12
- 239000000725 suspension Substances 0.000 claims abstract description 4
- 230000004044 response Effects 0.000 claims description 12
- 239000011358 absorbing material Substances 0.000 claims description 6
- 230000005284 excitation Effects 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 6
- 230000007547 defect Effects 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 abstract description 3
- 238000004088 simulation Methods 0.000 description 6
- 238000005457 optimization Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/15—Vehicle, aircraft or watercraft design
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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
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- 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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention discloses a road noise calculation method based on chassis attachment point force, which specifically comprises the following steps: aiming at the structure of the tested chassis and the suspension load, a corresponding rack is designed to provide a mounting point and a load, so that the real mounting and stress conditions of the chassis are simulated; placing a force sensor between the rack and a mounting point of a chassis to be tested, and connecting the chassis, the force sensor and the rack by using bolts; the force sensor is connected with the signal acquisition instrument; fixing a rack with the chassis installed on a rotary drum, aligning the centers of wheels with the center of the rotary drum, operating the rotary drum according to a certain speed to simulate the operation of a real vehicle, collecting the attachment point force of each chassis by a force sensor, and transmitting the attachment point force to a signal collector; and loading the acquired chassis attachment point force to a finite element model of the decorative vehicle body, and calculating the road noise in the vehicle. The invention avoids the modeling and calculation of non-linear materials such as tires and bushings by directly testing the chassis attachment point force, and overcomes the defect of insufficient precision of the two methods.
Description
Technical Field
The invention relates to the field of automobile noise simulation, in particular to a road noise calculation method based on chassis attachment point force.
Background
The road noise simulation of the vehicle is to predict the road noise by means of finite elements in a data stage and identify and optimize the problems existing in the vehicle structure. The existing road noise calculation methods mainly include two methods:
the first type, the road surface power density spectrum, the modal tire and the whole vehicle model have the main defects that: 1) modeling of the modal tire requires a standard alignment with a real object, and the workload is large; 2) due to the fact that rubber and other nonlinear materials are adopted, simulation accuracy of the modal tire is difficult to guarantee; 3) the whole vehicle needs to be modeled, and the chassis is provided with more nonlinear materials such as rubber bushings and the like, so that the deviation of a simulation result can be caused;
second, the wheel center force + full car model (without tires), the main disadvantages are: 1) the modeling of the chassis cannot be avoided, and the simulation precision cannot be guaranteed (the influence of nonlinear materials such as rubber bushings on the result); 2) the acquisition of the wheel hub force needs to be based on a hybrid vehicle, and the hybrid vehicle is manufactured at a later time, and the data is usually frozen, so that the road noise problem cannot be identified in a data stage in a simulation mode, and the structure is optimized.
According to the road noise calculation method based on the chassis attachment point force, the chassis attachment point force is directly tested, modeling and calculation of non-linear materials such as tires and bushes are avoided, the defect that the accuracy of the two methods is insufficient is overcome, meanwhile, a vehicle body is not needed for measuring the chassis attachment point force, so that the time point is advanced, a road noise result can be obtained in a data stage, and a large amount of time is strived for problem identification and optimization of a vehicle structure.
Disclosure of Invention
The present invention is directed to a road noise calculation method based on chassis attachment point force, so as to solve the problems in the background art. In order to achieve the purpose, the invention provides the following technical scheme: a road noise calculation method based on chassis attachment point force specifically comprises the following steps:
(1) customizing a rack: aiming at the structure of the tested chassis and the suspension load, a corresponding rack is designed to provide a mounting point and a load, so that the real mounting and stress conditions of the chassis are simulated;
(2) and connecting the force sensor: placing a force sensor between the rack and a mounting point of a chassis to be tested, and connecting the chassis, the force sensor and the rack by using bolts; the force sensor is connected with the signal acquisition instrument;
(3) acquiring the force of the chassis attachment point: fixing a rack with the chassis installed on a rotary drum, aligning the centers of wheels with the center of the rotary drum, operating the rotary drum according to a certain speed to simulate the operation of a real vehicle, collecting the attachment point force of each chassis by a force sensor, and transmitting the attachment point force to a signal collector;
(4) and calculating the road noise: and loading the acquired chassis attachment point force to a finite element model of the decorative vehicle body, and calculating the road noise in the vehicle.
Preferably, the method for calculating the road noise in the vehicle in (4) is to obtain the contribution amount of each path by using a TPA, the TPA is a transmission path analysis, and the specific method is as follows: assuming that the decorative body system is a linear system, the sound pressure response at the ear is the superposition of the excitation energy transmitted to the interior of the vehicle along each path (namely each chassis attachment point); for the acoustic cavity inside the vehicle, the acoustic equation based on finite elements is:
for boundaries without sound absorbing material, the characteristic root of the acoustic equation can be derived:
for boundaries with sound absorbing material, the characteristic root of the acoustic equation can be derived:
sound pressure distribution under different boundaries can be obtained according to the two formulas; for a single path, the acoustic response (NTF) under unit force can be found; for all paths, the total sound pressure level in the vehicle can be calculated by the following formula:
in the formula, PKPK is the total sound pressure response at the ear, NTFiNTFi is the response at the ear under the action of the unit exciting force on the ith path, and FiFi is the exciting force on the ith path.
Preferably, the force sensor in (2) is connected with the data acquisition instrument through a cable, and the force sensor in (3) transmits the acquired chassis attachment point force to the signal acquisition instrument through the cable.
The invention has the technical effects and advantages that: the invention avoids the modeling and calculation of non-linear materials such as tires and bushings by directly testing the chassis attachment point force, overcomes the defect of insufficient precision of the two methods, simultaneously, the chassis attachment point force measurement does not need a vehicle body, so the time point is advanced, the road noise result can be obtained in the data stage, and a great deal of time is obtained for the problem identification and optimization of the vehicle structure.
Drawings
FIG. 1 is a force diagram of a bench test chassis attachment point;
fig. 2 is a schematic diagram of a road noise calculation process according to the present invention.
In the figure: 1-a rotary drum, 2-a data acquisition instrument, 3-a chassis, 4-a force sensor and 5-a rack.
Detailed Description
In the description of the present invention, it should be noted that unless otherwise specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements.
Examples
(1) Customizing the rack 5, namely designing the corresponding rack 5 according to the structure of the tested chassis 3 and the suspension load, and ensuring that the mounting point position of the chassis 3 and the overall weight of the rack 5 are consistent with the vehicle body;
(2) as shown in fig. 1, the force sensor 4 is disposed between the stage 5 and the base 3 to be measured, and fixed thereto with bolts; the force sensor 4 is connected with the data acquisition instrument 2 through a cable;
(3) as shown in fig. 1, the stand 5 is fixed on the ground by bolts, and the center of the tire is ensured to be flush with the center of the rotary drum 1;
(4) the rotary drum 1 is operated according to the specified rotating speed, and the data acquisition instrument 2 records the data of the attachment point force of each chassis 3;
(5) as shown in fig. 2, the obtained attachment point force of the chassis 3 is loaded on a finite element model with a decorative body, the road noise in the vehicle is obtained by solving, and the contribution of each path is obtained, and the theoretical basis of the calculation is TPA (transmission path analysis); the decorative car body system is considered to be a linear system, and the sound pressure response at the ear is the superposition of the excitation energy transmitted to the interior of the car along each path (namely each chassis attachment point); for the acoustic cavity inside the vehicle, the acoustic equation based on finite elements is:
for boundaries without sound absorbing material, the characteristic root of the acoustic equation can be derived:
for boundaries with sound absorbing material, the characteristic root of the acoustic equation can be derived:
sound pressure distribution under different boundaries can be obtained according to the two formulas; for a single path, the acoustic response (NTF) under unit force can be found; for all paths, the total sound pressure level in the vehicle can be calculated by the following formula:
in the formula, PKPK is the total sound pressure response at the ear, NTFiNTFi is the response at the ear under the action of the unit exciting force on the ith path, and FiFi is the exciting force on the ith path. Through a TPA mode, the total road noise value can be calculated, and the contribution amount of each transmission path can be obtained; the direction of optimization may be determined according to the ordering of the contributions.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (3)
1. A road noise calculation method based on chassis attachment point force is characterized in that: the method specifically comprises the following steps of,
(1) customizing a rack: aiming at the structure of the tested chassis and the suspension load, a corresponding rack is designed to provide a mounting point and a load, so that the real mounting and stress conditions of the chassis are simulated;
(2) and connecting the force sensor: placing a force sensor between the rack and a mounting point of a chassis to be tested, and connecting the chassis, the force sensor and the rack by using bolts; the force sensor is connected with the signal acquisition instrument;
(3) acquiring the force of the chassis attachment point: fixing a rack with the chassis installed on a rotary drum, aligning the centers of wheels with the center of the rotary drum, operating the rotary drum according to a certain speed to simulate the operation of a real vehicle, collecting the attachment point force of each chassis by a force sensor, and transmitting the attachment point force to a signal collector;
(4) and calculating the road noise: and loading the acquired chassis attachment point force to a finite element model of the decorative vehicle body, and calculating the road noise in the vehicle.
2. The method for calculating road noise based on chassis attachment point force according to claim 1, wherein: the method for calculating the noise in the vehicle interior in the step (4) is to obtain the contribution amount of each path by using a TPA (TPA), wherein the TPA is a transmission path analysis method, and the method specifically comprises the following steps: assuming that the decorative body system is a linear system, the sound pressure response at the ear is the superposition of the excitation energy transmitted to the interior of the vehicle along each path (namely each chassis attachment point); for the acoustic cavity inside the vehicle, the acoustic equation based on finite elements is:
for boundaries without sound absorbing material, the characteristic root of the acoustic equation can be derived:
for boundaries with sound absorbing material, the characteristic root of the acoustic equation can be derived:
sound pressure distribution under different boundaries can be obtained according to the two formulas; for a single path, the acoustic response (NTF) under unit force can be found; for all paths, the total sound pressure level in the vehicle can be calculated by the following formula:
in the formula, PKPKFor total response of sound pressure at the ear, NTFiNTFiFor the response of the human ear under the action of the unit excitation force on the ith path, FiFiIs the excitation force acting on the ith path.
3. The method for calculating road noise based on chassis attachment point force according to claim 1, wherein: and (2) the force sensor is connected with the data acquisition instrument through a cable, and (3) the force sensor transmits the acquired chassis attachment point force to the signal acquisition instrument through the cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010482609.2A CN111783221A (en) | 2020-05-31 | 2020-05-31 | Road noise calculation method based on chassis attachment point force |
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| CN202010482609.2A CN111783221A (en) | 2020-05-31 | 2020-05-31 | Road noise calculation method based on chassis attachment point force |
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| CN111783221A true CN111783221A (en) | 2020-10-16 |
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| CN202010482609.2A Pending CN111783221A (en) | 2020-05-31 | 2020-05-31 | Road noise calculation method based on chassis attachment point force |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113296443A (en) * | 2021-05-24 | 2021-08-24 | 中国汽车工程研究院股份有限公司 | Road noise control analysis system based on chassis parameter model selection |
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2020
- 2020-05-31 CN CN202010482609.2A patent/CN111783221A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113296443A (en) * | 2021-05-24 | 2021-08-24 | 中国汽车工程研究院股份有限公司 | Road noise control analysis system based on chassis parameter model selection |
| CN113296443B (en) * | 2021-05-24 | 2022-08-26 | 中国汽车工程研究院股份有限公司 | Road noise control analysis system based on chassis parameter model selection |
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Application publication date: 20201016 |