CN111595590A - Idle noise optimization method, device, equipment and storage medium - Google Patents

Idle noise optimization method, device, equipment and storage medium Download PDF

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CN111595590A
CN111595590A CN202010404677.7A CN202010404677A CN111595590A CN 111595590 A CN111595590 A CN 111595590A CN 202010404677 A CN202010404677 A CN 202010404677A CN 111595590 A CN111595590 A CN 111595590A
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noise
sound pressure
pressure level
exhaust
vehicle
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冯雷
田静
周彬彬
张静
胡庆春
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Anhui Jianghuai Automobile Group Corp
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Anhui Jianghuai Automobile Group Corp
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    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M17/00—Testing of vehicles
    • G01M17/007—Wheeled or endless-tracked vehicles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
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Abstract

The invention discloses an idle noise optimization method, an idle noise optimization device, idle noise optimization equipment and a storage medium, wherein the method comprises the steps of carrying out shielding disconnection operation on a preset part of a vehicle to be detected in a preset test environment to obtain corresponding target noise; obtaining the noise contribution of each noise of the vehicle to be detected under the idle working condition according to the target noise and a preset sound pressure formula; and determining the noise optimization scheme of the vehicle to be detected according to the noise contribution amount, so that the main problem points influencing the idle noise in the vehicle can be optimized quickly and effectively, and the NVH performance of the whole vehicle is improved, thereby optimizing the idle noise of the whole vehicle in a targeted and quick and effective manner.

Description

Idle noise optimization method, device, equipment and storage medium
Technical Field
The invention relates to the field of automobile noise reduction, in particular to an idle speed noise optimization method, device, equipment and storage medium.
Background
With the increasing requirement of people on the comfort of the automobile, the NVH (Noise, Vibration, Harshness) performance of the automobile is more and more emphasized by people, and idle speed Noise in the automobile is the first factor perceived by people when the people use the automobile and is an important factor for evaluating the NVH performance of the whole automobile; because the idle noise contains more complex noise components, and has both structural sound and radiated sound, a good method for separation and contribution decomposition is not available at present, and the contribution of the idle noise is not analyzed clearly, which is not beneficial to the noise reduction.
The existing method mainly depends on the experience of NVH engineers, has strong subjectivity, cannot confirm the frequency and contribution of the power assembly and the exhaust by frequency spectrum analysis, cannot obtain various noises contained in idle speed noise, and cannot perform targeted, rapid and effective optimization on the idle speed noise of the whole vehicle.
Disclosure of Invention
The invention mainly aims to provide an idle noise optimization method, an idle noise optimization device, idle noise optimization equipment and a storage medium, and aims to solve the technical problems that in the prior art, the subjectivity is high due to the experience of NVH engineers, the frequency and the contribution of a power assembly and exhaust gas corresponding to frequency cannot be confirmed through frequency spectrum analysis, and the idle noise optimization of a whole vehicle cannot be performed in a targeted and rapid and effective manner.
To achieve the above object, the present invention provides an idle noise optimization method, including the steps of:
shielding and disconnecting a preset part of a vehicle to be detected in a preset test environment to acquire corresponding target noise;
according to the target noise, obtaining the noise contribution of each noise of the vehicle to be detected under the idle working condition through a preset sound pressure formula;
and determining a noise optimization scheme of the vehicle to be detected according to the noise contribution amount.
Optionally, the shielding and disconnecting operation is performed on a preset component of the vehicle to be detected in a preset test environment to acquire corresponding target noise, including:
acquiring the total noise of the vehicle to be detected under the working conditions of a heat engine and idling of a power assembly;
shielding an exhaust port of the vehicle to be detected, and acquiring noise of the exhaust port of the vehicle to be detected under the working conditions of a heat engine and an idle speed of the power assembly;
shielding an exhaust port and an exhaust silencer of the vehicle to be detected, and acquiring noise of the separated exhaust port of the vehicle to be detected under the working conditions of the heat engine of the power assembly and the idling;
shielding an exhaust port and an exhaust muffler of the vehicle to be detected, disconnecting an exhaust lifting lug and acquiring exhaust structure noise of the vehicle to be detected under the working conditions of a heat engine and idling of the power assembly;
shielding an exhaust port and an exhaust silencer of the vehicle to be detected, disconnecting an exhaust lifting lug, a power assembly suspension and a pipeline, and acquiring the radiation noise of the power assembly of the vehicle to be detected under the idling working condition;
correspondingly, the obtaining of the noise contribution of each noise of the vehicle to be detected under the idle working condition through a preset sound pressure formula according to the target noise includes:
and obtaining the noise contribution amount of each noise of the vehicle to be detected under the idling working condition through a preset sound pressure formula according to the total noise, the separation exhaust port noise, the separation exhaust muffler noise, the exhaust structure noise and the power assembly structure noise.
Optionally, the preset test environment is that a vehicle to be detected is placed in the target noise elimination chamber, and a wheel of the vehicle to be detected is placed on the hub experiment platform;
the total noise, the noise of the separation exhaust port, the noise of the separation exhaust muffler, the noise of the exhaust structure and the noise of the power assembly structure are collected at a preset noise collection position through a collection device.
Optionally, the obtaining, according to the total noise, the separation exhaust port noise, the separation exhaust muffler noise, the exhaust structure noise, and the powertrain structure noise, a noise contribution amount of each noise of the vehicle to be detected under an idle condition through a preset sound pressure formula includes:
according to the total noise, the separated exhaust port noise, the separated exhaust silencer noise, the exhaust structure noise and the power assembly structure noise, acquiring an exhaust port noise sound pressure level corresponding to the exhaust port noise, an exhaust silencer noise sound pressure level corresponding to the exhaust silencer radiation noise, an exhaust structure noise sound pressure level corresponding to the exhaust lug structure noise, a power assembly radiation noise sound pressure level corresponding to the power assembly radiation noise and a power assembly structure noise sound pressure level corresponding to the power assembly structure noise through a preset sound pressure formula;
respectively obtaining sound energy corresponding to the sound pressure level of the exhaust port noise, the sound pressure level of the exhaust silencer noise, the sound pressure level of the exhaust structure noise, the sound pressure level of the power assembly radiation noise and the sound pressure level of the power assembly structure noise through a preset relational formula, wherein the preset relational formula reflects a formula of a mapping relation between the sound energy and the sound pressure level;
and determining the noise contribution amount of each noise of the vehicle to be detected under the idle working condition according to each sound energy.
Optionally, the obtaining, according to the total noise, the separated exhaust port noise, the separated exhaust muffler noise, the exhaust structure noise, and the powertrain structure noise, an exhaust port noise sound pressure level corresponding to the exhaust port noise, an exhaust muffler noise sound pressure level corresponding to the exhaust muffler radiation noise, an exhaust structure noise sound pressure level corresponding to the exhaust shackle structure noise, a powertrain radiation noise sound pressure level corresponding to the powertrain radiation noise, and a powertrain structure noise sound pressure level corresponding to the powertrain structure noise by using a preset sound pressure formula includes:
respectively acquiring actual sound pressures corresponding to the total noise, the separation exhaust port noise, the separation exhaust muffler noise, the exhaust structure noise and the power assembly structure noise based on the preset noise acquisition position;
and obtaining the sound pressure level of the exhaust port noise corresponding to the exhaust port noise, the sound pressure level of the exhaust muffler noise corresponding to the exhaust muffler radiation noise, the sound pressure level of the exhaust structure noise corresponding to the exhaust lifting lug structure noise, the sound pressure level of the power assembly radiation noise corresponding to the power assembly radiation noise and the sound pressure level of the power assembly structure noise corresponding to the power assembly structure noise by utilizing the preset sound pressure formula according to a preset reference sound pressure and the actual sound pressure.
Optionally, the obtaining, according to a preset reference sound pressure and the actual sound pressure, a sound pressure level of exhaust port noise corresponding to the exhaust port noise, a sound pressure level of exhaust muffler noise corresponding to the exhaust muffler radiation noise, a sound pressure level of exhaust structure noise corresponding to the exhaust lifting lug structure noise, a sound pressure level of power assembly radiation noise corresponding to the power assembly radiation noise, and a sound pressure level of power assembly structure noise corresponding to the power assembly structure noise by using the preset sound pressure formula includes:
each sound pressure level is obtained by the following preset sound pressure level subtraction formula:
Figure BDA0002488254880000031
Figure BDA0002488254880000032
Figure BDA0002488254880000033
Figure BDA0002488254880000034
Q5＝N4
wherein Q is1For the noise sound pressure level, Q, of the power train structure2Is the exhaust port noise sound pressure level, Q3For noise sound pressure level, Q, of exhaust mufflers4For exhaust structure noise sound pressure level, Q5For the power train radiated noise sound pressure level, N is the total noise sound pressure level of the total noise, N1Separation vent noise corresponding to the separation vent noiseSound pressure level, N2For the noise level of the separating exhaust muffler corresponding to the noise of said separating exhaust muffler, N3For separating exhaust structure noise sound pressure level, N, corresponding to said exhaust structure noise4The sound pressure level of the power assembly radiation noise corresponding to the power assembly radiation noise is obtained;
correspondingly, the total noise sound pressure level, the separation exhaust port noise sound pressure level, the separation exhaust muffler noise sound pressure level, the separation exhaust structure noise sound pressure level and the power assembly radiation noise sound pressure level are obtained by the following preset sound pressure level formulas:
Figure BDA0002488254880000041
wherein L isPIs the sound pressure level, P is the actual sound pressure, P0Is a preset reference sound pressure.
Optionally, the obtaining, by a preset relational formula, sound energies corresponding to the sound pressure level of the exhaust port noise, the sound pressure level of the exhaust muffler noise, the sound pressure level of the exhaust structure noise, the sound pressure level of the power assembly radiation noise, and the sound pressure level of the power assembly structure noise respectively includes:
respectively obtaining sound energy corresponding to the sound pressure level of the exhaust port noise, the sound pressure level of the exhaust silencer noise, the sound pressure level of the exhaust structure noise, the sound pressure level of the power assembly radiation noise and the sound pressure level of the power assembly structure noise through the following preset relational formulas:
Figure BDA0002488254880000042
wherein E is sound energy, P is sound pressure, and L isPTo total sound pressure level, P0Is a preset reference sound pressure;
correspondingly, the determining the noise contribution amount of each noise of the vehicle to be detected under the idle working condition according to each sound energy includes:
determining the noise contribution amount of each noise of the vehicle to be detected under the idling working condition according to each sound energy by using the following preset sound energy contribution ratio formula:
Figure BDA0002488254880000043
wherein,
Figure BDA0002488254880000044
the noise contribution of each noise, total energy of E-bit sound, E1Is the sound energy of each noise, P is the total sound pressure, P1Is the sound pressure of each noise, LP1For each noise sound pressure level, LPIs the total sound pressure level.
Further, to achieve the above object, the present invention also proposes an idle noise optimization device including:
the noise acquisition module is used for shielding and disconnecting a preset component of the vehicle to be detected in a preset test environment so as to acquire corresponding target noise;
the contribution amount obtaining module is used for obtaining the noise contribution amount of each noise of the vehicle to be detected under the idle working condition through a preset sound pressure formula according to the target noise;
and the optimization module is used for determining a noise optimization scheme of the vehicle to be detected according to the noise contribution amount.
Further, to achieve the above object, the present invention also proposes an idle noise optimization apparatus including: a memory, a processor and an idle noise optimization program stored on the memory and executable on the processor, the idle noise optimization program configured to implement the steps of the idle noise optimization method as described above.
Furthermore, to achieve the above object, the present invention also proposes a storage medium having stored thereon an idle noise optimization program which, when executed by a processor, implements the steps of the idle noise optimization method as described above.
According to the idle noise optimization method, the preset part of the vehicle to be detected is shielded and disconnected in the preset test environment, so that the corresponding target noise is obtained; according to the target noise, obtaining the noise contribution of each noise of the vehicle to be detected under the idle working condition through a preset sound pressure formula; and determining the noise optimization scheme of the vehicle to be detected according to the noise contribution amount, so that the main problem points influencing the idle noise in the vehicle can be optimized quickly and effectively, and the NVH performance of the whole vehicle is improved, thereby optimizing the idle noise of the whole vehicle in a targeted and quick and effective manner.
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FIG. 1 is a schematic diagram of an apparatus architecture of a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart diagram of a first embodiment of an idle noise optimization method of the present invention;
FIG. 3 is a schematic flow chart diagram of a second embodiment of the idle noise optimization method of the present invention;
FIG. 4 is a schematic flow chart diagram of a third embodiment of an idle noise optimization method of the present invention;
fig. 5 is a functional block diagram of a first embodiment of an idle noise optimizing apparatus of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The solution of the embodiment of the invention is mainly as follows: the method comprises the steps that a preset part of a vehicle to be detected is subjected to shielding disconnection operation in a preset test environment to obtain corresponding target noise; according to the target noise, obtaining the noise contribution of each noise of the vehicle to be detected under the idle working condition through a preset sound pressure formula; determining a noise optimization scheme of the vehicle to be detected according to the noise contribution amount; the main problem point that influences idle speed noise in the vehicle can be optimized fast and effectively, and the NVH performance of the whole vehicle is improved, so that the idle speed noise of the whole vehicle can be optimized pertinently, fast and effectively, and the technical problem that idle speed noise of the whole vehicle cannot be optimized pertinently, fast and effectively in the prior art is solved.
Referring to fig. 1, fig. 1 is a schematic device structure diagram of a hardware operating environment according to an embodiment of the present invention.
As shown in fig. 1, the idle noise optimization apparatus may include: a processor 1001, such as a CPU, a communication bus 1002, a user side interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., a Wi-Fi interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the configuration of the apparatus shown in fig. 1 is not intended to be limiting of the apparatus and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, the memory 1005, which is a kind of computer storage medium, may include an operating system, a network communication module, a user side interface module, and an idle noise optimization program.
The apparatus of the present invention calls an idle noise optimization program stored in the memory 1005 by the processor 1001 and performs the following operations:
shielding and disconnecting a preset part of a vehicle to be detected in a preset test environment to acquire corresponding target noise;
according to the target noise, obtaining the noise contribution of each noise of the vehicle to be detected under the idle working condition through a preset sound pressure formula;
and determining a noise optimization scheme of the vehicle to be detected according to the noise contribution amount.
Further, the processor 1001 may call the idle noise optimization program stored in the memory 1005, and also perform the following operations:
acquiring the total noise of the vehicle to be detected under the working conditions of a heat engine and idling of a power assembly;
shielding an exhaust port of the vehicle to be detected, and acquiring noise of the exhaust port of the vehicle to be detected under the working conditions of a heat engine and an idle speed of the power assembly;
shielding an exhaust port and an exhaust silencer of the vehicle to be detected, and acquiring noise of the separated exhaust port of the vehicle to be detected under the working conditions of the heat engine of the power assembly and the idling;
shielding an exhaust port and an exhaust muffler of the vehicle to be detected, disconnecting an exhaust lifting lug and acquiring exhaust structure noise of the vehicle to be detected under the working conditions of a heat engine and idling of the power assembly;
shielding an exhaust port and an exhaust silencer of the vehicle to be detected, disconnecting an exhaust lifting lug, a power assembly suspension and a pipeline, and acquiring the radiation noise of the power assembly of the vehicle to be detected under the idling working condition;
correspondingly, the obtaining of the noise contribution of each noise of the vehicle to be detected under the idle working condition through a preset sound pressure formula according to the target noise includes:
and obtaining the noise contribution amount of each noise of the vehicle to be detected under the idling working condition through a preset sound pressure formula according to the total noise, the separation exhaust port noise, the separation exhaust muffler noise, the exhaust structure noise and the power assembly structure noise.
Further, the processor 1001 may call the idle noise optimization program stored in the memory 1005, and also perform the following operations:
the preset test environment is that a vehicle to be detected is placed in a target noise elimination chamber, and a wheel of the vehicle to be detected is placed on a hub experiment platform;
the total noise, the noise of the separation exhaust port, the noise of the separation exhaust muffler, the noise of the exhaust structure and the noise of the power assembly structure are collected at a preset noise collection position through a collection device.
Further, the processor 1001 may call the idle noise optimization program stored in the memory 1005, and also perform the following operations:
according to the total noise, the separated exhaust port noise, the separated exhaust silencer noise, the exhaust structure noise and the power assembly structure noise, acquiring an exhaust port noise sound pressure level corresponding to the exhaust port noise, an exhaust silencer noise sound pressure level corresponding to the exhaust silencer radiation noise, an exhaust structure noise sound pressure level corresponding to the exhaust lug structure noise, a power assembly radiation noise sound pressure level corresponding to the power assembly radiation noise and a power assembly structure noise sound pressure level corresponding to the power assembly structure noise through a preset sound pressure formula;
respectively obtaining sound energy corresponding to the sound pressure level of the exhaust port noise, the sound pressure level of the exhaust silencer noise, the sound pressure level of the exhaust structure noise, the sound pressure level of the power assembly radiation noise and the sound pressure level of the power assembly structure noise through a preset relational formula, wherein the preset relational formula reflects a formula of a mapping relation between the sound energy and the sound pressure level;
and determining the noise contribution amount of each noise of the vehicle to be detected under the idle working condition according to each sound energy.
Further, the processor 1001 may call the idle noise optimization program stored in the memory 1005, and also perform the following operations:
respectively acquiring actual sound pressures corresponding to the total noise, the separation exhaust port noise, the separation exhaust muffler noise, the exhaust structure noise and the power assembly structure noise based on the preset noise acquisition position;
and obtaining the sound pressure level of the exhaust port noise corresponding to the exhaust port noise, the sound pressure level of the exhaust muffler noise corresponding to the exhaust muffler radiation noise, the sound pressure level of the exhaust structure noise corresponding to the exhaust lifting lug structure noise, the sound pressure level of the power assembly radiation noise corresponding to the power assembly radiation noise and the sound pressure level of the power assembly structure noise corresponding to the power assembly structure noise by utilizing the preset sound pressure formula according to a preset reference sound pressure and the actual sound pressure.
Further, the processor 1001 may call the idle noise optimization program stored in the memory 1005, and also perform the following operations:
each sound pressure level is obtained by the following preset sound pressure level subtraction formula:
Figure BDA0002488254880000093
Figure BDA0002488254880000094
Figure BDA0002488254880000095
Figure BDA0002488254880000096
Q5＝N4
wherein Q is1For the noise sound pressure level, Q, of the power train structure2Is the exhaust port noise sound pressure level, Q3For noise sound pressure level, Q, of exhaust mufflers4For exhaust structure noise sound pressure level, Q5For the power train radiated noise sound pressure level, N is the total noise sound pressure level of the total noise, N1A separation vent noise sound pressure level, N, corresponding to the separation vent noise2For the noise level of the separating exhaust muffler corresponding to the noise of said separating exhaust muffler, N3For separating exhaust structure noise sound pressure level, N, corresponding to said exhaust structure noise4The sound pressure level of the power assembly radiation noise corresponding to the power assembly radiation noise is obtained;
correspondingly, the total noise sound pressure level, the separation exhaust port noise sound pressure level, the separation exhaust muffler noise sound pressure level, the separation exhaust structure noise sound pressure level and the power assembly radiation noise sound pressure level are obtained by the following preset sound pressure level formulas:
Figure BDA0002488254880000091
wherein L isPIs the sound pressure level, P is the actual sound pressure, P0Is a preset reference sound pressure.
Further, the processor 1001 may call the idle noise optimization program stored in the memory 1005, and also perform the following operations:
respectively obtaining sound energy corresponding to the sound pressure level of the exhaust port noise, the sound pressure level of the exhaust silencer noise, the sound pressure level of the exhaust structure noise, the sound pressure level of the power assembly radiation noise and the sound pressure level of the power assembly structure noise through the following preset relational formulas:
Figure BDA0002488254880000092
wherein E is sound energy, P is sound pressure, and L isPTo total sound pressure level, P0Is a preset reference sound pressure;
correspondingly, the determining the noise contribution amount of each noise of the vehicle to be detected under the idle working condition according to each sound energy includes:
determining the noise contribution amount of each noise of the vehicle to be detected under the idling working condition according to each sound energy by using the following preset sound energy contribution ratio formula:
Figure BDA0002488254880000101
wherein,
Figure BDA0002488254880000102
the noise contribution of each noise, total energy of E-bit sound, E1Is the sound energy of each noise, P is the total sound pressure, P1Is the sound pressure of each noise, LP1For each noise sound pressure level, LPIs the total sound pressure level.
According to the scheme, the preset part of the vehicle to be detected is shielded and disconnected in the preset test environment, so that the corresponding target noise is obtained; according to the target noise, obtaining the noise contribution of each noise of the vehicle to be detected under the idle working condition through a preset sound pressure formula; and determining the noise optimization scheme of the vehicle to be detected according to the noise contribution amount, so that the main problem points influencing the idle noise in the vehicle can be optimized quickly and effectively, and the NVH performance of the whole vehicle is improved, thereby optimizing the idle noise of the whole vehicle in a targeted and quick and effective manner.
Based on the hardware structure, the embodiment of the idle noise optimization method is provided.
Referring to fig. 2, fig. 2 is a flowchart illustrating an idle noise optimization method according to a first embodiment of the present invention.
In a first embodiment, the idle noise optimization method comprises the steps of:
and step S10, carrying out shielding disconnection operation on the preset component of the vehicle to be detected in the preset test environment to acquire the corresponding target noise.
It should be noted that the preset test environment is a preset environment for performing a whole vehicle idle noise test on a vehicle to be detected, and in actual operation, the preset test environment is to place the vehicle to be detected in a target noise elimination chamber, place a wheel of the vehicle to be detected on a hub experiment platform, that is, place the wheel of the vehicle to be detected on the hub experiment platform, and place the vehicle to be detected in the noise elimination chamber, which may also be other preset test environments, which is not limited in this embodiment; the preset component is a preset vehicle component which needs to be shielded and disconnected, and the corresponding target noise can be obtained by shielding and disconnecting the preset component of the vehicle to be detected in the preset test environment.
And step S20, obtaining the noise contribution of each noise of the vehicle to be detected under the idling condition according to the target noise and a preset sound pressure formula.
It can be understood that the preset sound pressure formula is a preset calculation formula for obtaining a noise contribution amount corresponding to the target noise, where the noise contribution amount is a noise occupancy ratio of a term of noise in the target noise to the total noise, that is, a contribution amount occupancy ratio corresponding to each part of noise.
And step S30, determining a noise optimization scheme of the vehicle to be detected according to the noise contribution amount.
It should be understood that, after obtaining the noise contribution amount, a corresponding noise optimization scheme may be provided for the vehicle component with a larger noise contribution amount, for example, sound insulation cotton is added, resonance noise reduction is performed, structure adjustment is performed on the corresponding component, a noise reduction or elimination effect is achieved by adding or reducing the corresponding component, friction is reduced by rubber isolation and elimination, and the like.
According to the scheme, the preset part of the vehicle to be detected is shielded and disconnected in the preset test environment, so that the corresponding target noise is obtained; obtaining the noise contribution of each noise of the vehicle to be detected under the idle working condition according to the target noise and a preset sound pressure formula; and determining the noise optimization scheme of the vehicle to be detected according to the noise contribution amount, so that the main problem points influencing the idle noise in the vehicle can be optimized quickly and effectively, and the NVH performance of the whole vehicle is improved, thereby optimizing the idle noise of the whole vehicle in a targeted and quick and effective manner.
Further, fig. 3 is a schematic flow chart of a second embodiment of the idle noise optimization method of the present invention, and as shown in fig. 3, the second embodiment of the idle noise optimization method of the present invention is proposed based on the first embodiment, in this embodiment, the step S10 specifically includes the following steps:
and step S11, acquiring the total noise of the vehicle to be detected under the working conditions of the heat engine of the power assembly and the idling.
It should be noted that the vehicle to be detected is in the preset test environment, and the total noise of the whole vehicle can be collected as the total noise under the thermal engine of the power assembly and the idle working condition; generally, the total noise is formed by the powertrain radiation noise, the powertrain structure noise, the exhaust lug structure noise, the exhaust muffler radiation noise and the exhaust port noise collected at the preset noise collection position.
And step S12, shielding the exhaust port of the vehicle to be detected, and acquiring the noise of the separated exhaust port of the vehicle to be detected under the working conditions of the heat engine and the idling of the power assembly.
It should be noted that the vehicle to be detected is in the preset test environment, the exhaust port of the vehicle to be detected is shielded, and noise of the separated exhaust port of the vehicle to be detected under the thermal engine and idle working conditions of the power assembly is obtained; namely, the separated exhaust port noise is other noise after the exhaust port noise is separated from the total noise; generally, the separated exhaust port noise is formed by powertrain radiation noise, powertrain structure noise, exhaust lug structure noise and exhaust muffler radiation noise collected at the preset noise collection position.
And step S13, shielding the exhaust port and the exhaust muffler of the vehicle to be detected, and acquiring the noise of the separated exhaust port of the vehicle to be detected under the heat engine of the power assembly and the idling working condition.
It should be understood that the vehicle to be detected is in the preset test environment, and the exhaust port and the exhaust muffler of the vehicle to be detected are shielded, so that the noise of the separated exhaust port of the vehicle to be detected under the thermal engine of the powertrain and the idle working condition is obtained; that is, the separated exhaust muffler noise is other noise obtained by separating the exhaust port noise and the exhaust muffler noise from the total noise, and generally, the separated exhaust muffler noise is formed by the powertrain radiation noise, the powertrain structure noise, and the exhaust lifting lug structure noise collected at the preset noise collection position.
And step S14, shielding the exhaust port and the exhaust muffler of the vehicle to be detected, disconnecting the exhaust lifting lug and acquiring the exhaust structure noise of the vehicle to be detected under the thermal engine and idle working conditions of the power assembly.
It can be understood that the vehicle to be detected is in the preset test environment, the exhaust port and the exhaust muffler of the vehicle to be detected are shielded, the exhaust lifting lug is disconnected, and exhaust structure noise of the vehicle to be detected under the thermal engine and idle working conditions of the powertrain is obtained; namely, the exhaust structure noise is other noise after exhaust port noise, exhaust muffler noise and exhaust lifting lug structure noise are separated from the total noise, and the exhaust structure noise is formed by powertrain radiation noise and powertrain structure noise collected at the preset noise collection position.
And step S15, shielding the exhaust port and the exhaust muffler of the vehicle to be detected, disconnecting the exhaust lifting lug, the powertrain suspension and the pipeline, and acquiring the radiation noise of the powertrain of the vehicle to be detected under the idling working condition.
It should be understood that the vehicle to be detected is in the preset test environment, the exhaust port and the exhaust muffler of the vehicle to be detected are shielded, the exhaust lifting lug, the powertrain mount and the pipeline are disconnected, and the powertrain radiation noise of the vehicle to be detected under the idle condition is acquired, that is, the powertrain structure noise is other noises after the exhaust port noise, the exhaust muffler noise, the exhaust lifting lug structure noise and the powertrain structure noise are separated from the total noise, the powertrain structure noise is acquired at the preset noise acquisition position, and the powertrain radiation noise is acquired by a separation calculation operation.
Accordingly, the target noise in step S20 is a set of separated exhaust port noise, separated exhaust muffler noise, exhaust structure noise, and powertrain radiation noise, and the noise contribution amount, i.e., the noise contribution ratio of each noise in the total noise.
According to the scheme, the total noise of the vehicle to be detected under the working conditions of the heat engine of the power assembly and the idling speed is obtained; shielding an exhaust port of the vehicle to be detected, and acquiring noise of the exhaust port of the vehicle to be detected under the working conditions of a heat engine and an idle speed of the power assembly; shielding an exhaust port and an exhaust silencer of the vehicle to be detected, and acquiring noise of the separated exhaust port of the vehicle to be detected under the working conditions of the heat engine of the power assembly and the idling; shielding an exhaust port and an exhaust muffler of the vehicle to be detected, disconnecting an exhaust lifting lug and acquiring exhaust structure noise of the vehicle to be detected under the working conditions of a heat engine and idling of the power assembly; shielding the exhaust port and the exhaust muffler of the vehicle to be detected, disconnecting the exhaust lifting lug, the power assembly suspension and the pipeline, acquiring the radiation noise of the power assembly of the vehicle to be detected under the idle working condition, calculating and separating the power assembly structure noise, the power assembly radiation noise, the exhaust structure noise, the exhaust port noise and the exhaust muffler radiation noise contained in the idle vehicle interior noise, accurately obtaining the noise intensity corresponding to each noise, and further preparing for subsequent targeted noise reduction and rectification.
Further, fig. 4 is a schematic flow chart of a third embodiment of the idle noise optimization method of the present invention, and as shown in fig. 4, the third embodiment of the idle noise optimization method of the present invention is proposed based on the second embodiment, in this embodiment, the step S20 specifically includes the following steps:
and step S21, obtaining the noise contribution amount of each noise of the vehicle to be detected under the idling working condition according to the total noise, the separation exhaust port noise, the separation exhaust muffler noise, the exhaust structure noise and the power assembly structure noise through a preset sound pressure formula.
It should be noted that the total noise, the noise of the separation exhaust port, the noise of the separation exhaust muffler, the noise of the exhaust structure, and the noise of the power assembly structure are collected at a preset noise collection position by a collection device; the preset noise collecting position may be set at a position where the front-row driving position of the vehicle to be detected is a preset distance away from the seat cushion, that is, the noise intensity of the noise is collected at the ear position of the front-row driver, of course, the noise intensity of the noise is collected at the collecting point set at the co-driving position or the rear-row position by a noise sensor, or the noise is collected at other collecting points, which is not limited in this embodiment; the noise contribution of each noise of the vehicle to be detected under the idle working condition, namely the ratio of each noise to the total noise, can be determined through the collected various noises through a preset sound pressure formula, and the noise contribution is used as a data basis of subsequent targeted noise optimization operation.
Further, the step S21 specifically includes the following steps:
according to the total noise, the separated exhaust port noise, the separated exhaust silencer noise, the exhaust structure noise and the power assembly structure noise, acquiring an exhaust port noise sound pressure level corresponding to the exhaust port noise, an exhaust silencer noise sound pressure level corresponding to the exhaust silencer radiation noise, an exhaust structure noise sound pressure level corresponding to the exhaust lug structure noise, a power assembly radiation noise sound pressure level corresponding to the power assembly radiation noise and a power assembly structure noise sound pressure level corresponding to the power assembly structure noise through a preset sound pressure formula;
respectively obtaining sound energy corresponding to the sound pressure level of the exhaust port noise, the sound pressure level of the exhaust silencer noise, the sound pressure level of the exhaust structure noise, the sound pressure level of the power assembly radiation noise and the sound pressure level of the power assembly structure noise through a preset relational formula, wherein the preset relational formula reflects a formula of a mapping relation between the sound energy and the sound pressure level;
and determining the noise contribution amount of each noise of the vehicle to be detected under the idle working condition according to each sound energy.
It can be understood that the noise sound pressure levels corresponding to the noises can be interacted through the noises and the preset sound pressure formula, and the sound energy corresponding to the sound pressure levels can be obtained through a preset relation formula, where the preset sound pressure formula and the preset relation formula are preset formulas, and can be obtained through training of a large amount of experimental data, or can be determined according to the daily operation experience of technicians, or can be determined through other manners, and this embodiment is not limited thereto; and determining the noise contribution amount of each noise of the vehicle to be detected under the idling condition according to the ratio of each sound energy to the total noise energy.
Further, the step of obtaining, according to the total noise, the separated exhaust port noise, the separated exhaust muffler noise, the exhaust structure noise, and the power assembly structure noise, an exhaust port noise sound pressure level corresponding to the exhaust port noise, an exhaust muffler noise sound pressure level corresponding to the exhaust muffler radiation noise, an exhaust structure noise sound pressure level corresponding to the exhaust shackle structure noise, a power assembly radiation noise sound pressure level corresponding to the power assembly radiation noise, and a power assembly structure noise sound pressure level corresponding to the power assembly structure noise by using a preset sound pressure formula specifically includes the following steps:
respectively acquiring actual sound pressures corresponding to the total noise, the separation exhaust port noise, the separation exhaust muffler noise, the exhaust structure noise and the power assembly structure noise based on the preset noise acquisition position;
and obtaining the sound pressure level of the exhaust port noise corresponding to the exhaust port noise, the sound pressure level of the exhaust muffler noise corresponding to the exhaust muffler radiation noise, the sound pressure level of the exhaust structure noise corresponding to the exhaust lifting lug structure noise, the sound pressure level of the power assembly radiation noise corresponding to the power assembly radiation noise and the sound pressure level of the power assembly structure noise corresponding to the power assembly structure noise by utilizing the preset sound pressure formula according to a preset reference sound pressure and the actual sound pressure.
It should be understood that the preset reference sound pressure is a preset sound pressure reference value, and generally, 2 × 10 is taken- 5Pa, which is the minimum sound pressure that can be heard by human ears, may be set to other values, which is not limited in this embodiment; after the actual sound pressure corresponding to each noise is obtained, the sound pressure level corresponding to each noise can be obtained by using the preset sound pressure formula according to the preset reference sound pressure and the actual sound pressure.
Further, the step of obtaining, according to a preset reference sound pressure and the actual sound pressure, a sound pressure level of the exhaust port noise corresponding to the exhaust port noise, a sound pressure level of the exhaust muffler noise corresponding to the exhaust muffler radiation noise, a sound pressure level of the exhaust structure noise corresponding to the exhaust lifting lug structure noise, a sound pressure level of the power assembly radiation noise corresponding to the power assembly radiation noise, and a sound pressure level of the power assembly structure noise corresponding to the power assembly structure noise by using the preset sound pressure formula includes:
each sound pressure level is obtained by the following preset sound pressure level subtraction formula:
Figure BDA0002488254880000152
Figure BDA0002488254880000153
Figure BDA0002488254880000154
Figure BDA0002488254880000155
Q5＝N4
wherein Q is1For the noise sound pressure level, Q, of the power train structure2Is the exhaust port noise sound pressure level, Q3For noise sound pressure level, Q, of exhaust mufflers4For exhaust structure noise sound pressure level, Q5For the power train radiated noise sound pressure level, N is the total noise sound pressure level of the total noise, N1A separation vent noise sound pressure level, N, corresponding to the separation vent noise2For the noise level of the separating exhaust muffler corresponding to the noise of said separating exhaust muffler, N3For separating exhaust structure noise sound pressure level, N, corresponding to said exhaust structure noise4The sound pressure level of the power assembly radiation noise corresponding to the power assembly radiation noise is obtained;
correspondingly, the total noise sound pressure level, the separation exhaust port noise sound pressure level, the separation exhaust muffler noise sound pressure level, the separation exhaust structure noise sound pressure level and the power assembly radiation noise sound pressure level are obtained by the following preset sound pressure level formulas:
Figure BDA0002488254880000151
wherein L isPIs the sound pressure level, P is the actual sound pressure, P0Is a preset reference sound pressure.
The sound pressure level cannot be directly added or subtracted, but the sound energy can be directly added or subtracted, and the sound energy is the square of the sound pressure.
Correspondingly, the step of respectively obtaining the sound energy corresponding to the sound pressure level of the exhaust port noise, the sound pressure level of the exhaust silencer noise, the sound pressure level of the exhaust structure noise, the sound pressure level of the power assembly radiation noise and the sound pressure level of the power assembly structure noise through a preset relational formula comprises the following steps of:
respectively obtaining sound energy corresponding to the sound pressure level of the exhaust port noise, the sound pressure level of the exhaust silencer noise, the sound pressure level of the exhaust structure noise, the sound pressure level of the power assembly radiation noise and the sound pressure level of the power assembly structure noise through the following preset relational formulas:
Figure BDA0002488254880000161
wherein E is sound energy, P is sound pressure, and L isPTo total sound pressure level, P0Is a preset reference sound pressure;
correspondingly, the determining the noise contribution amount of each noise of the vehicle to be detected under the idle working condition according to each sound energy includes:
determining the noise contribution amount of each noise of the vehicle to be detected under the idling working condition according to each sound energy by using the following preset sound energy contribution ratio formula:
Figure BDA0002488254880000162
wherein,
Figure BDA0002488254880000163
the noise contribution of each noise, total energy of E-bit sound, E1Is the sound energy of each noise, P is the total sound pressure, P1For the sound of each noisePressure, LP1For each noise sound pressure level, LPIs the total sound pressure level.
It can be understood that, through the above calculation, the power assembly structure noise, the power assembly radiation noise, the exhaust structure noise, the exhaust port noise and the exhaust muffler radiation noise contained in the idling vehicle interior noise can be calculated and separated, the contribution amount can be identified, and the main contribution amount is subjected to targeted noise reduction, so that the reduction of the idling noise is facilitated, that is, the power assembly related to the idling vehicle interior noise and the exhaust structure sound and radiation sound can be effectively separated, the competitive product vehicle can be compared, and through comparison, the targeted noise reduction and modification can be performed on the noise with larger sound pressure level and larger noise energy contribution ratio, so that the purpose of reducing the idling noise in the vehicle is achieved, and the NVH performance of the whole vehicle is improved.
According to the scheme, according to the total noise, the separated exhaust port noise, the separated exhaust muffler noise, the exhaust structure noise and the power assembly structure noise, an exhaust port noise sound pressure level corresponding to the exhaust port noise, an exhaust muffler noise sound pressure level corresponding to the exhaust muffler radiation noise, an exhaust structure noise sound pressure level corresponding to the exhaust lifting lug structure noise, a power assembly radiation noise sound pressure level corresponding to the power assembly radiation noise and a power assembly structure noise sound pressure level corresponding to the power assembly structure noise are obtained through a preset sound pressure formula;
respectively obtaining sound energy corresponding to the sound pressure level of the exhaust port noise, the sound pressure level of the exhaust silencer noise, the sound pressure level of the exhaust structure noise, the sound pressure level of the power assembly radiation noise and the sound pressure level of the power assembly structure noise through a preset relational formula, wherein the preset relational formula reflects a formula of a mapping relation between the sound energy and the sound pressure level;
the noise contribution amount of each noise of the vehicle to be detected under the idle working condition is determined according to each sound energy, each noise can be calculated and separated, and the corresponding contribution amount is identified, so that the main contribution amount is subjected to targeted noise reduction, the idle noise reduction is facilitated, the main problem points influencing the idle noise in the vehicle can be quickly and effectively optimized, the NVH performance of the whole vehicle is improved, and the idle noise of the whole vehicle is optimized in a targeted and quick and effective manner.
Based on the embodiment of the idle noise optimization method, the invention further provides an idle noise optimization device.
Referring to fig. 5, fig. 5 is a functional block diagram of the idle noise optimizing apparatus according to the first embodiment of the present invention.
In a first embodiment of the idle noise optimization device of the present invention, the idle noise optimization device includes:
the noise obtaining module 10 is configured to perform a shielding disconnection operation on a preset component of a vehicle to be detected in a preset test environment to obtain a corresponding target noise.
It should be noted that the preset test environment is a preset environment for performing a whole vehicle idle noise test on a vehicle to be detected, and in actual operation, the preset test environment is to place the vehicle to be detected in a target noise elimination chamber, place a wheel of the vehicle to be detected on a hub experiment platform, that is, place the wheel of the vehicle to be detected on the hub experiment platform, and place the vehicle to be detected in the noise elimination chamber, which may also be other preset test environments, which is not limited in this embodiment; the preset component is a preset vehicle component which needs to be shielded and disconnected, and the corresponding target noise can be obtained by shielding and disconnecting the preset component of the vehicle to be detected in the preset test environment.
And the contribution amount obtaining module 20 is configured to obtain, according to the target noise, noise contribution amounts of the noises of the vehicle to be detected under the idle speed working condition through a preset sound pressure formula.
It can be understood that the preset sound pressure formula is a preset calculation formula for obtaining a noise contribution amount corresponding to the target noise, where the noise contribution amount is a noise occupancy ratio of a term of noise in the target noise to the total noise, that is, a contribution amount occupancy ratio corresponding to each part of noise.
And the optimization module 30 is configured to determine a noise optimization scheme of the vehicle to be detected according to the noise contribution amount.
It should be understood that, after obtaining the noise contribution amount, a corresponding noise optimization scheme may be provided for the vehicle component with a larger noise contribution amount, for example, sound insulation cotton is added, resonance noise reduction is performed, structure adjustment is performed on the corresponding component, a noise reduction or elimination effect is achieved by adding or reducing the corresponding component, friction is reduced by rubber isolation and elimination, and the like.
The steps implemented by the functional modules of the idle noise optimization device may refer to the embodiments of the idle noise optimization method of the present invention, and are not described herein again.
Furthermore, an embodiment of the present invention further provides a storage medium having an idle noise optimization program stored thereon, where the idle noise optimization program is executed by a processor to implement the following operations:
shielding and disconnecting a preset part of a vehicle to be detected in a preset test environment to acquire corresponding target noise;
according to the target noise, obtaining the noise contribution of each noise of the vehicle to be detected under the idle working condition through a preset sound pressure formula;
and determining a noise optimization scheme of the vehicle to be detected according to the noise contribution amount.
Further, the idle noise optimization program when executed by the processor further performs the following operations:
acquiring the total noise of the vehicle to be detected under the working conditions of a heat engine and idling of a power assembly;
shielding an exhaust port of the vehicle to be detected, and acquiring noise of the exhaust port of the vehicle to be detected under the working conditions of a heat engine and an idle speed of the power assembly;
shielding an exhaust port and an exhaust silencer of the vehicle to be detected, and acquiring noise of the separated exhaust port of the vehicle to be detected under the working conditions of the heat engine of the power assembly and the idling;
shielding an exhaust port and an exhaust muffler of the vehicle to be detected, disconnecting an exhaust lifting lug and acquiring exhaust structure noise of the vehicle to be detected under the working conditions of a heat engine and idling of the power assembly;
shielding an exhaust port and an exhaust silencer of the vehicle to be detected, disconnecting an exhaust lifting lug, a power assembly suspension and a pipeline, and acquiring the radiation noise of the power assembly of the vehicle to be detected under the idling working condition;
correspondingly, the obtaining of the noise contribution of each noise of the vehicle to be detected under the idle working condition through a preset sound pressure formula according to the target noise includes:
and obtaining the noise contribution amount of each noise of the vehicle to be detected under the idling working condition through a preset sound pressure formula according to the total noise, the separation exhaust port noise, the separation exhaust muffler noise, the exhaust structure noise and the power assembly structure noise.
Further, the idle noise optimization program when executed by the processor further performs the following operations:
the preset test environment is that a vehicle to be detected is placed in a target noise elimination chamber, and a wheel of the vehicle to be detected is placed on a hub experiment platform;
the total noise, the noise of the separation exhaust port, the noise of the separation exhaust muffler, the noise of the exhaust structure and the noise of the power assembly structure are collected at a preset noise collection position through a collection device.
Further, the idle noise optimization program when executed by the processor further performs the following operations:
according to the total noise, the separated exhaust port noise, the separated exhaust silencer noise, the exhaust structure noise and the power assembly structure noise, acquiring an exhaust port noise sound pressure level corresponding to the exhaust port noise, an exhaust silencer noise sound pressure level corresponding to the exhaust silencer radiation noise, an exhaust structure noise sound pressure level corresponding to the exhaust lug structure noise, a power assembly radiation noise sound pressure level corresponding to the power assembly radiation noise and a power assembly structure noise sound pressure level corresponding to the power assembly structure noise through a preset sound pressure formula;
respectively obtaining sound energy corresponding to the sound pressure level of the exhaust port noise, the sound pressure level of the exhaust silencer noise, the sound pressure level of the exhaust structure noise, the sound pressure level of the power assembly radiation noise and the sound pressure level of the power assembly structure noise through a preset relational formula, wherein the preset relational formula reflects a formula of a mapping relation between the sound energy and the sound pressure level;
and determining the noise contribution amount of each noise of the vehicle to be detected under the idle working condition according to each sound energy.
Further, the idle noise optimization program when executed by the processor further performs the following operations:
respectively acquiring actual sound pressures corresponding to the total noise, the separation exhaust port noise, the separation exhaust muffler noise, the exhaust structure noise and the power assembly structure noise based on the preset noise acquisition position;
and obtaining the sound pressure level of the exhaust port noise corresponding to the exhaust port noise, the sound pressure level of the exhaust muffler noise corresponding to the exhaust muffler radiation noise, the sound pressure level of the exhaust structure noise corresponding to the exhaust lifting lug structure noise, the sound pressure level of the power assembly radiation noise corresponding to the power assembly radiation noise and the sound pressure level of the power assembly structure noise corresponding to the power assembly structure noise by utilizing the preset sound pressure formula according to a preset reference sound pressure and the actual sound pressure.
Further, the idle noise optimization program when executed by the processor further performs the following operations:
each sound pressure level is obtained by the following preset sound pressure level subtraction formula:
Figure BDA0002488254880000202
Figure BDA0002488254880000203
Figure BDA0002488254880000204
Figure BDA0002488254880000205
Q5＝N4
wherein Q is1For the noise sound pressure level, Q, of the power train structure2Is the exhaust port noise sound pressure level, Q3For noise sound pressure level, Q, of exhaust mufflers4For exhaust structure noise sound pressure level, Q5For the power train radiated noise sound pressure level, N is the total noise sound pressure level of the total noise, N1A separation vent noise sound pressure level, N, corresponding to the separation vent noise2For the noise level of the separating exhaust muffler corresponding to the noise of said separating exhaust muffler, N3For separating exhaust structure noise sound pressure level, N, corresponding to said exhaust structure noise4The sound pressure level of the power assembly radiation noise corresponding to the power assembly radiation noise is obtained;
correspondingly, the total noise sound pressure level, the separation exhaust port noise sound pressure level, the separation exhaust muffler noise sound pressure level, the separation exhaust structure noise sound pressure level and the power assembly radiation noise sound pressure level are obtained by the following preset sound pressure level formulas:
Figure BDA0002488254880000201
wherein L isPIs the sound pressure level, P is the actual sound pressure, P0Is a preset reference sound pressure.
Further, the idle noise optimization program when executed by the processor further performs the following operations:
respectively obtaining sound energy corresponding to the sound pressure level of the exhaust port noise, the sound pressure level of the exhaust silencer noise, the sound pressure level of the exhaust structure noise, the sound pressure level of the power assembly radiation noise and the sound pressure level of the power assembly structure noise through the following preset relational formulas:
Figure BDA0002488254880000211
wherein E is sound energy, P is sound pressure, and L isPTo total sound pressure level, P0Is a preset reference sound pressure;
correspondingly, the determining the noise contribution amount of each noise of the vehicle to be detected under the idle working condition according to each sound energy includes:
determining the noise contribution amount of each noise of the vehicle to be detected under the idling working condition according to each sound energy by using the following preset sound energy contribution ratio formula:
Figure BDA0002488254880000212
wherein,
Figure BDA0002488254880000213
the noise contribution of each noise, total energy of E-bit sound, E1Is the sound energy of each noise, P is the total sound pressure, P1Is the sound pressure of each noise, LP1For each noise sound pressure level, LPIs the total sound pressure level.
According to the scheme, the preset part of the vehicle to be detected is shielded and disconnected in the preset test environment, so that the corresponding target noise is obtained; according to the target noise, obtaining the noise contribution of each noise of the vehicle to be detected under the idle working condition through a preset sound pressure formula; and determining the noise optimization scheme of the vehicle to be detected according to the noise contribution amount, so that the main problem points influencing the idle noise in the vehicle can be optimized quickly and effectively, and the NVH performance of the whole vehicle is improved, thereby optimizing the idle noise of the whole vehicle in a targeted and quick and effective manner.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system 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 system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. An idle noise optimization method, comprising:
shielding and disconnecting a preset part of a vehicle to be detected in a preset test environment to acquire corresponding target noise;
obtaining the noise contribution of each noise of the vehicle to be detected under the idle working condition according to the target noise and a preset sound pressure formula;
and determining a noise optimization scheme of the vehicle to be detected according to the noise contribution amount.
2. The idle noise optimization method of claim 1, wherein said performing a shield-breaking operation on a predetermined component of the vehicle under test in a predetermined test environment to obtain a corresponding target noise comprises:
acquiring the total noise of the vehicle to be detected under the working conditions of a heat engine and idling of a power assembly;
shielding an exhaust port of the vehicle to be detected, and acquiring noise of the exhaust port of the vehicle to be detected under the working conditions of a heat engine and an idle speed of the power assembly;
shielding an exhaust port and an exhaust silencer of the vehicle to be detected, and acquiring noise of the separated exhaust port of the vehicle to be detected under the working conditions of the heat engine of the power assembly and the idling;
shielding an exhaust port and an exhaust muffler of the vehicle to be detected, disconnecting an exhaust lifting lug and acquiring exhaust structure noise of the vehicle to be detected under the working conditions of a heat engine and idling of the power assembly;
shielding an exhaust port and an exhaust silencer of the vehicle to be detected, disconnecting an exhaust lifting lug, a power assembly suspension and a pipeline, and acquiring the radiation noise of the power assembly of the vehicle to be detected under the idling working condition;
correspondingly, the obtaining of the noise contribution of each noise of the vehicle to be detected under the idle working condition through a preset sound pressure formula according to the target noise and the preset sound pressure formula includes:
and obtaining the noise contribution amount of each noise of the vehicle to be detected under the idling working condition through a preset sound pressure formula according to the total noise, the separation exhaust port noise, the separation exhaust muffler noise, the exhaust structure noise and the power assembly structure noise.
3. The idle noise optimization method of claim 2, wherein the predetermined test environment is placing a vehicle to be tested in the target anechoic chamber and placing a wheel of the vehicle to be tested on the hub test platform;
the total noise, the noise of the separation exhaust port, the noise of the separation exhaust muffler, the noise of the exhaust structure and the noise of the power assembly structure are collected at a preset noise collection position through a collection device.
4. The idle noise optimization method of claim 3, wherein the obtaining the noise contribution of each noise of the vehicle under test under the idle condition according to the total noise, the separated exhaust port noise, the separated exhaust muffler noise, the exhaust structure noise and the powertrain structure noise by a preset sound pressure formula comprises:
according to the total noise, the separated exhaust port noise, the separated exhaust silencer noise, the exhaust structure noise and the power assembly structure noise, acquiring an exhaust port noise sound pressure level corresponding to the exhaust port noise, an exhaust silencer noise sound pressure level corresponding to the exhaust silencer radiation noise, an exhaust structure noise sound pressure level corresponding to the exhaust lug structure noise, a power assembly radiation noise sound pressure level corresponding to the power assembly radiation noise and a power assembly structure noise sound pressure level corresponding to the power assembly structure noise through a preset sound pressure formula;
respectively obtaining sound energy corresponding to the sound pressure level of the exhaust port noise, the sound pressure level of the exhaust silencer noise, the sound pressure level of the exhaust structure noise, the sound pressure level of the power assembly radiation noise and the sound pressure level of the power assembly structure noise through a preset relational formula, wherein the preset relational formula reflects a formula of a mapping relation between the sound energy and the sound pressure level;
and determining the noise contribution amount of each noise of the vehicle to be detected under the idle working condition according to each sound energy.
5. The idle noise optimization method of claim 4 wherein said obtaining an exhaust port noise sound pressure level corresponding to the exhaust port noise, an exhaust muffler noise sound pressure level corresponding to the exhaust muffler radiated noise, an exhaust structure noise sound pressure level corresponding to the exhaust shackle structure noise, a powertrain radiated noise sound pressure level corresponding to the powertrain radiated noise, and a powertrain structure noise sound pressure level corresponding to the powertrain structure noise according to the total noise, the split exhaust port noise, the split exhaust muffler noise, the exhaust structure noise, and the powertrain structure noise by a predetermined sound pressure equation comprises:
respectively acquiring actual sound pressures corresponding to the total noise, the separation exhaust port noise, the separation exhaust muffler noise, the exhaust structure noise and the power assembly structure noise based on the preset noise acquisition position;
and obtaining the sound pressure level of the exhaust port noise corresponding to the exhaust port noise, the sound pressure level of the exhaust muffler noise corresponding to the exhaust muffler radiation noise, the sound pressure level of the exhaust structure noise corresponding to the exhaust lifting lug structure noise, the sound pressure level of the power assembly radiation noise corresponding to the power assembly radiation noise and the sound pressure level of the power assembly structure noise corresponding to the power assembly structure noise by utilizing the preset sound pressure formula according to a preset reference sound pressure and the actual sound pressure.
6. The idle noise optimization method of claim 5 wherein said obtaining an exhaust port noise sound pressure level corresponding to the exhaust port noise, an exhaust muffler noise sound pressure level corresponding to the exhaust muffler radiated noise, an exhaust structure noise sound pressure level corresponding to the exhaust shackle structure noise, a powertrain radiated noise sound pressure level corresponding to the powertrain radiated noise, and a powertrain structure noise sound pressure level corresponding to the powertrain structure noise using the preset sound pressure equation based on a preset reference sound pressure and the actual sound pressure comprises:
each sound pressure level is obtained by the following preset sound pressure level subtraction formula:
Figure FDA0002488254870000031
Figure FDA0002488254870000032
Figure FDA0002488254870000033
Figure FDA0002488254870000034
Q5＝N4
wherein Q is1For the noise sound pressure level, Q, of the power train structure2Is the exhaust port noise sound pressure level, Q3To exhaust gasesNoise sound pressure level, Q, of a muffler4For exhaust structure noise sound pressure level, Q5For the power train radiated noise sound pressure level, N is the total noise sound pressure level of the total noise, N1A separation vent noise sound pressure level, N, corresponding to the separation vent noise2For the noise level of the separating exhaust muffler corresponding to the noise of said separating exhaust muffler, N3For separating exhaust structure noise sound pressure level, N, corresponding to said exhaust structure noise4The sound pressure level of the power assembly radiation noise corresponding to the power assembly radiation noise is obtained;
wherein the total noise sound pressure level, the separation exhaust port noise sound pressure level, the separation exhaust muffler noise sound pressure level, the separation exhaust structure noise sound pressure level and the power assembly radiation noise sound pressure level are obtained by the following preset sound pressure level formulas:
Figure FDA0002488254870000035
wherein L isPIs the sound pressure level, P is the actual sound pressure, P0Is a preset reference sound pressure.
7. The idle noise optimization method of claim 4 wherein said obtaining acoustic energy corresponding to said exhaust port noise sound pressure level, said exhaust muffler noise sound pressure level, said exhaust structure noise sound pressure level, said powertrain radiated noise sound pressure level, and said powertrain structure noise sound pressure level, respectively, by a predetermined relational formula comprises:
respectively obtaining sound energy corresponding to the sound pressure level of the exhaust port noise, the sound pressure level of the exhaust silencer noise, the sound pressure level of the exhaust structure noise, the sound pressure level of the power assembly radiation noise and the sound pressure level of the power assembly structure noise through the following preset relational formulas:
Figure FDA0002488254870000041
wherein E is soundEnergy, P is sound pressure, LPTo total sound pressure level, P0Is a preset reference sound pressure;
correspondingly, the determining the noise contribution amount of each noise of the vehicle to be detected under the idle working condition according to each sound energy includes:
determining the noise contribution amount of each noise of the vehicle to be detected under the idling working condition according to each sound energy by using the following preset sound energy contribution ratio formula:
Figure FDA0002488254870000042
wherein,
Figure FDA0002488254870000043
the noise contribution of each noise, total energy of E-bit sound, E1Is the sound energy of each noise, P is the total sound pressure, P1Is the sound pressure of each noise, LP1For each noise sound pressure level, LPIs the total sound pressure level.
8. An idle noise optimization device, comprising:
the noise acquisition module is used for shielding and disconnecting a preset component of the vehicle to be detected in a preset test environment so as to acquire corresponding target noise;
the contribution amount obtaining module is used for obtaining the noise contribution amount of each noise of the vehicle to be detected under the idle working condition through a preset sound pressure formula according to the target noise;
and the optimization module is used for determining a noise optimization scheme of the vehicle to be detected according to the noise contribution amount.
9. An idle noise optimization device, comprising: a memory, a processor, and an idle noise optimization program stored on the memory and executable on the processor, the idle noise optimization program configured to implement the steps of the idle noise optimization method of any one of claims 1-7.
10. A storage medium having stored thereon an idle noise optimization program which when executed by a processor implements the steps of the idle noise optimization method of any one of claims 1-7.
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CN113884312A (en) * 2021-09-30 2022-01-04 安徽江淮汽车集团股份有限公司 TPA analysis model-based in-vehicle rumbling troubleshooting method
CN113959734A (en) * 2021-10-18 2022-01-21 中国第一汽车股份有限公司 Method, device, medium and equipment for separating noise source in vehicle
CN114386180A (en) * 2022-03-24 2022-04-22 江铃汽车股份有限公司 Design method and system for equivalent conversion of double tail pipes and single tail pipe and storage medium
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CN115342902A (en) * 2022-06-27 2022-11-15 中国第一汽车股份有限公司 Method for analyzing contribution of exhaust hanging vibration isolation element to noise in vehicle
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CN115219220A (en) * 2021-07-05 2022-10-21 广州汽车集团股份有限公司 Vehicle NVH performance attenuation analysis method and device and storage medium
CN113884312A (en) * 2021-09-30 2022-01-04 安徽江淮汽车集团股份有限公司 TPA analysis model-based in-vehicle rumbling troubleshooting method
CN113959734A (en) * 2021-10-18 2022-01-21 中国第一汽车股份有限公司 Method, device, medium and equipment for separating noise source in vehicle
CN114386180A (en) * 2022-03-24 2022-04-22 江铃汽车股份有限公司 Design method and system for equivalent conversion of double tail pipes and single tail pipe and storage medium
CN115342902A (en) * 2022-06-27 2022-11-15 中国第一汽车股份有限公司 Method for analyzing contribution of exhaust hanging vibration isolation element to noise in vehicle
CN116025544A (en) * 2023-03-27 2023-04-28 江西五十铃汽车有限公司 Method, system and equipment for reducing working noise of in-vehicle compressor

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Application publication date: 20200828