CN114076681A - Howling noise evaluation method and related device - Google Patents

Howling noise evaluation method and related device Download PDF

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CN114076681A
CN114076681A CN202010844551.1A CN202010844551A CN114076681A CN 114076681 A CN114076681 A CN 114076681A CN 202010844551 A CN202010844551 A CN 202010844551A CN 114076681 A CN114076681 A CN 114076681A
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CN114076681B (en
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宋祥太
刘晓伟
朱敏杰
张宏波
王人杰
袁卫平
罗春根
王园
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SAIC Motor Corp Ltd
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Abstract

The embodiment of the application provides a howling noise evaluation method and a related device, and aims at a target engine to obtain a total noise value and order noise of the target engine. And determining a howling noise correction coefficient of the target engine according to the total noise value and the sample total noise value of at least one sample engine. Based on the above, the order noise of the target engine is corrected by using the howling noise correction coefficient, the normalized howling noise of the target engine is determined, various background noises in the order noise of the target engine are eliminated, the influence of various background noises on the howling noise when the howling noise of the engine is evaluated is reduced, and the evaluation accuracy of the howling noise of the engine is improved. Therefore, the normalized engine howling noise can be considered as a result measured under the same test environment, and can be used as an evaluation parameter of the engine howling level for evaluating the engine howling noise.

Description

Howling noise evaluation method and related device
Technical Field
The application relates to the technical field of engines, in particular to a howling noise evaluation method and a related device.
Background
The engine has a complex structure, and generates a lot of squeaking noises during working, such as timing gear train meshing noise, balance shaft system gear meshing noise, supercharger synchronous noise and the like. Most of these noises have a low sound pressure level, but have a great influence on the sound quality in the vehicle.
Due to the reasons of processing consistency and assembly consistency of engine parts and the like, the total noise value or the order noise of the off-line engine is different, the masking effect of the different total noise values on the order noise is different, and the subjective feeling of a person on the squeal noise is evaluated only from the sound pressure level of the order noise, so that the deviation is easy to occur. Similarly, for the same engine matched on different vehicle types, due to the difference of the sound absorption and insulation performance, the tire noise, the wind noise and other performances of the whole vehicle, the background noise in the vehicle is different, and the subjective feeling of the person on the squeaking noise can be influenced.
Disclosure of Invention
In order to solve the technical problems in the prior art, the application provides a howling noise evaluation method and a related device, and the evaluation accuracy of the engine howling noise is improved.
In one aspect, an embodiment of the present application provides a howling noise evaluation method, where the method includes:
acquiring a total noise value and order noise of a target engine;
determining a howling noise correction coefficient of the target engine according to the total noise value and a sample total noise value of at least one sample engine; wherein the sample engine is a non-complaint engine based on a full vehicle assessment;
and determining the normalized howling noise of the target engine according to the order noise and the howling noise correction coefficient.
In one possible implementation, the method further includes:
if the normalized howling noise is larger than the maximum normalized howling noise, determining that the target engine is unqualified; wherein the maximum normalized howling noise is determined based on the sample engine.
In one possible implementation, the method further includes:
acquiring a total noise value of N sample engines, wherein N is greater than or equal to 1;
and calculating the average value of the noise total values of the N sample engines, and taking the average value as the sample noise total value.
In one possible implementation, the method further includes:
obtaining order noise of the N sample engines;
determining the normalized howling noise of the N sample engines according to the total noise values of the N sample engines and the order noise of the N sample engines;
and determining the maximum normalized howling noise according to the normalized howling noise of the N sample engines.
In one possible implementation, the method further includes:
acquiring a noise score of the undetermined engine;
and if the noise score is larger than a score threshold value, taking the undetermined engine as the sample engine.
In one possible implementation, the method further includes:
acquiring normalized squeal noise of a target engine in a rotating speed range; wherein the rotational speed range is determined based on a minimum rotational speed and a maximum rotational speed;
acquiring the maximum normalized squeal noise of the sample engine in the rotating speed range;
and if the normalized squeal noise of the target engine is not greater than the maximum normalized squeal noise in the rotating speed range, determining that the target engine is qualified.
In one possible implementation, the target engine includes a full-vehicle based engine and/or an off-line engine.
On the other hand, the embodiment of the present application uses a howling noise evaluation device, which includes an acquisition unit and a determination unit:
the acquiring unit is used for acquiring a total noise value and an order noise of the target engine;
the determining unit is used for determining a howling noise correction coefficient of the target engine according to the total noise value and a sample total noise value of at least one sample engine; wherein the sample engine is a non-complaint engine based on a full vehicle assessment;
the determining unit is further configured to determine the normalized howling noise of the target engine according to the order noise and the howling noise correction coefficient.
In a possible implementation manner, the determining unit is further configured to:
if the normalized howling noise is larger than the maximum normalized howling noise, determining that the target engine is unqualified; wherein the maximum normalized howling noise is determined based on the sample engine.
In a possible implementation manner, the obtaining unit is further configured to:
acquiring a total noise value of N sample engines, wherein N is greater than or equal to 1;
the apparatus further comprises a computing unit:
and the calculating unit is used for calculating the average value of the noise total values of the N sample engines and taking the average value as the sample noise total value.
In a possible implementation manner, the obtaining unit is further configured to:
obtaining order noise of the N sample engines;
the determining unit is further configured to:
determining the normalized howling noise of the N sample engines according to the total noise values of the N sample engines and the order noise of the N sample engines;
and determining the maximum normalized howling noise according to the normalized howling noise of the N sample engines.
In a possible implementation manner, the obtaining unit is further configured to obtain a noise score of the pending engine;
and if the noise score is larger than a score threshold value, taking the undetermined engine as the sample engine.
In a possible implementation manner, the obtaining unit is further configured to
Acquiring normalized squeal noise of a target engine in a rotating speed range; wherein the rotational speed range is determined based on a minimum rotational speed and a maximum rotational speed;
acquiring the maximum normalized squeal noise of the sample engine in the rotating speed range;
the determination unit is also used for
And if the normalized squeal noise of the target engine is not greater than the maximum normalized squeal noise in the rotating speed range, determining that the target engine is qualified.
In one possible implementation, the target engine includes a full-vehicle based engine and/or an off-line engine.
In another aspect, an embodiment of the present application provides an apparatus for howling noise evaluation, where the apparatus includes a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to perform the method of the above aspect according to instructions in the program code.
In another aspect, the present application provides a computer-readable storage medium for storing a computer program for executing the method of the above aspect.
According to the scheme, the total noise value and the order noise of the target engine are obtained. And determining a howling noise correction coefficient of the target engine according to the total noise value and the sample total noise value of at least one sample engine, wherein the howling noise correction coefficient identifies various background noises of the target engine in the test environment. Based on the above, the order noise of the target engine is corrected by using the howling noise correction coefficient, the normalized howling noise of the target engine is determined, various background noises in the order noise of the target engine are eliminated, the influence of various background noises on the howling noise when the howling noise of the engine is evaluated is reduced, and the evaluation accuracy of the howling noise of the engine is improved. Therefore, the normalized engine howling noise can be considered as a result measured under the same test environment, and can be used as an evaluation parameter of the engine howling level for evaluating the engine howling noise.
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In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic flowchart of a howling noise evaluation method according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a total engine noise level and an order noise level according to an embodiment of the present disclosure;
FIG. 3 is a colormap of an engine noise test provided by an embodiment of the present application;
FIG. 4 is a graphical illustration of a sample engine normalized howling noise provided by an embodiment of the present application;
FIG. 5 is a schematic diagram of an offline engine squeal noise evaluation provided by an embodiment of the present application;
fig. 6 is a schematic structural diagram of a howling noise evaluation apparatus used in an embodiment of the present application.
Detailed Description
Embodiments of the present application are described below with reference to the accompanying drawings.
In the related art, the engine squeal noise evaluation may be evaluated by the magnitude of the squeal order noise level, which is a method with high requirements for the test environment, and usually requires an engine bench test under the condition of a semi-anechoic chamber (semi-free field) to obtain the engine squeal noise level. However, the method consumes a lot of manpower and material resources, takes a long time, cannot be applied to offline quick inspection of the engine, and has differences in squeaking noise levels of offline engines due to the influence of factors such as engine assembly and part processing consistency. After the engine with serious squeaking is loaded, the whole vehicle complains, the engine needs to be replaced and the engine returns to a factory for repair, the production beat is seriously influenced, and the production cost is improved.
In order to improve the evaluation accuracy of the engine howling noise, the embodiment of the application provides a howling noise evaluation method and a related device.
The howling noise evaluation method provided by the embodiment of the application can be applied to a howling noise evaluation device with data processing capability, such as a terminal device or a server, and the method can be independently executed by the terminal device, can also be independently executed by the server, can also be applied to a network scene of communication between the terminal device and the server, and is executed by matching the terminal device and the server. The terminal equipment can be a mobile phone, a tablet and the like; the server may be understood as an application server or a Web server, and in actual deployment, the server may be an independent server or a cluster server.
For convenience of describing the scheme, in the embodiments of the present application, a server is mainly used as a howling noise evaluation device, and the howling noise evaluation method provided in the embodiments of the present application is independently performed for explanation.
Referring to fig. 1, fig. 1 is a schematic flow chart of a howling noise evaluation method provided in an embodiment of the present application. As shown in fig. 1, the howling noise evaluation method includes the following steps:
s101: a total noise value and an order noise of the target engine are obtained.
In practical application, the noise signal of the target engine can be collected when the target engine works normally, and the total noise value and the order noise of the target engine can be calculated according to the noise information. The total noise value refers to an effective noise value/Root Mean Square (RMS) value in an audible range of human ears, and includes total noise of each frequency component. The order noise is noise caused by rotation of an engine rotating member, and corresponds to the engine speed and the engine frequency.
In one possible implementation, the target engine may be a baseline vehicle based engine or an off-line engine. A reference vehicle is understood to be a complete vehicle for testing engine squeal noise, and an off-line engine refers to an off-line engine that is assembled from a production line.
In this embodiment, for an offline engine, a noise signal under an acceleration condition is collected, and a total noise value and an order noise a weighting sound pressure level are calculated according to the noise signal. The sound pressure level is expressed in decibels and is recorded as dB. A weighted sound pressure level is a frequency weighted one, close to the human ear experience, denoted dB (A).
Referring to fig. 2 and fig. 3, fig. 2 is a schematic diagram of a total value and order noise of engine noise provided in the embodiment of the present application, and fig. 3 is a colormap of an engine noise test provided in the embodiment of the present application. In view of the audible range of the human ear, the test bandwidth is set to 20-12800Hz in this example. The order width is set to 0.5 order.
S102: and determining a howling noise correction coefficient of the target engine according to the total noise value and the sample total noise value of at least one sample engine.
In a possible implementation manner, a noise score of the undetermined engine may be obtained for selection of the sample engine, and if the noise score is greater than a score threshold, the undetermined engine is used as the sample engine. Wherein, the engine to be determined is based on the engine of whole car. Since the subjective score for the sample engine howling noise is greater than the score threshold, the sample engine can be considered to be a subjectively assessed non-complaint engine.
For example, according to the subjective rating table 1, engine squeal noise after loading is subjectively evaluated, and an engine having a rating of 7 or more (no subjective complaint) is selected as a sample engine to be used for engine squeal noise evaluation.
TABLE 1 subjective evaluation chart of engine squeaking noise
Figure BDA0002642601220000061
Based on the method, N engines without subjective complaints are screened out to be used as sample engines. The squeal noise of the target engine is evaluated using the N engines.
In one possible implementation, a total noise value, denoted as L, for N sample engines may be obtainedp_i. Wherein, N is more than or equal to 1, i is 1,2,3 …, N.
Then, the average of the noise total values of the N sample engines is calculated and taken as a sample noise total value
Figure BDA0002642601220000071
Namely, it is
Figure BDA0002642601220000072
The howling noise correction coefficient K of the target engineorderComprises the following steps:
Figure BDA0002642601220000073
s103: and determining the normalized howling noise of the target engine according to the order noise and the howling noise correction coefficient.
Order noise L based on target engineorderHowling noise correction coefficient KorderThe normalized howling noise L of the target engine can be determinedG_orderComprises the following steps:
Figure BDA0002642601220000074
the howling noise evaluation method provided by the embodiment acquires the total noise value and the order noise of the target engine. And determining a howling noise correction coefficient of the target engine according to the total noise value and the sample total noise value of at least one sample engine, wherein the howling noise correction coefficient identifies various background noises of the target engine in the test environment. Based on the above, the order noise of the target engine is corrected by using the howling noise correction coefficient, the normalized howling noise of the target engine is determined, various background noises in the order noise of the target engine are eliminated, the influence of various background noises on the howling noise when the howling noise of the engine is evaluated is reduced, and the evaluation accuracy of the howling noise of the engine is improved. Therefore, the normalized engine howling noise can be considered as a result measured under the same test environment, and can be used as an evaluation parameter of the engine howling level for evaluating the engine howling noise.
In practical application, after the normalized squeal noise of the engine is determined, whether the engine is qualified or not can be judged by utilizing the maximum normalized squeal noise. In one possible implementation, the target engine is determined to be disqualified if the normalized howling noise of the target engine is greater than the maximum normalized howling noise. Wherein the maximum normalized howling noise is determined based on the sample engine.
In the process of determining the maximum normalized howling noise, the order noise L of the above N sample engines may be obtainedorder_iWherein i is 1,2,3 …, N.
Then, based on the noise total value of the N sample engines and the above sample noise total value, it is possible to determine the noise total value of the N sample engines respectivelyGenerating respective squealing noise correction coefficients K corresponding to N sample enginesorder_iComprises the following steps:
Figure BDA0002642601220000081
therefore, the order noise L of the engine can be obtained according to the N samplesorder_iHowling noise correction coefficient Korder_iThe normalized howling noise L of the N sample engines is determinedG_order_iComprises the following steps:
Figure BDA0002642601220000082
then, the maximum normalized howling noise can be determined according to the normalized howling noise of the N sample engines. Specifically, the average value of the normalized squeal noise of the N sample engines is calculated first
Figure BDA0002642601220000083
Comprises the following steps:
Figure BDA0002642601220000084
therefore, the N sample engines normalize the standard deviation S of the squeal noiseorderComprises the following steps:
Figure BDA0002642601220000085
defining the maximum normalized Howling noise L for the N sample enginesG_order_maxComprises the following steps:
Figure BDA0002642601220000086
wherein, a is the maximum normalized howling noise calculation coefficient and is an expansion coefficient closely related to the confidence coefficient, b is a constant, and a and b are within the range of R.
Maximum normalized howling noise LG_order_maxThe method can be used as a judgment basis for evaluating the engine howling noise, and the normalized howling noise L of any off-line engine is calculatedG_orderThen, whether the normalized squeal noise of the offline engine is larger than the maximum normalized squeal noise can be judged. If so, the offline engine may be determined to be ineligible. When L isG_order>LG_order_maxThe offline engine has a risk of complaints from screech.
In one possible implementation, the normalized squeal noise of the target engine over a range of speeds may be obtained, and the maximum normalized squeal noise of the sample engine over the range of speeds may be obtained. And if the normalized squeal noise of the target engine is not greater than the maximum normalized squeal noise in the rotating speed range, determining that the target engine is qualified.
Wherein the rotation speed range is determined based on a minimum rotation speed and a maximum rotation speed. That is, when the target engine is in the rotation speed range, the normalized howling noise corresponding to each rotation speed is smaller than the maximum normalized howling noise determined based on the sample engine, and it can be determined that the target engine is qualified and has no risk of howling complaints. If the normalized squeal noise corresponding to a certain rotating speed is not less than the maximum normalized squeal, the target engine is unqualified, and the risk of the squeal complaint exists.
For better understanding, a howling noise evaluation method provided by the embodiment of the present application is described below with reference to specific examples.
Firstly, 10 engines with subjective evaluation scores not less than 7 are selected as sample engines, and the numbers are respectively as follows: 3524. 3529, 3594, 3598, 3630, 3677, 3711, 3531, 3635, 3666.
The total noise value and the order noise of the 10 engines at the rotating speed of 1500rpm are obtained, and are specifically shown in table 2:
TABLE 2 Total and order noise for 10 sample engines at 1500rpm
Figure BDA0002642601220000091
Calculating the average value of the noise total values of the 10 engines
Figure BDA0002642601220000092
Comprises the following steps:
Figure BDA0002642601220000093
the howling noise correction coefficients and normalized howling noise of these 10 engines are shown in table 3, respectively:
normalized howling noise calculation results at Table 31500 rpm
Figure BDA0002642601220000094
In this embodiment, if a is 1.5 and b is 1, the maximum normalized howling noise L is obtainedG_order_maxComprises the following steps:
Figure BDA0002642601220000095
based on the above, the normalized howling noise of the sample engine is determined in the rotation speed range, respectively. Specifically, within the rotation speed range from the minimum rotation speed to the maximum rotation speed, the normalized squeal noise and the maximum normalized squeal noise of the sample engine at each rotation speed are calculated by using 25rpm as a step length, as shown in fig. 4.
Maximum normalized howling noise L obtained based on sample engineG_order_maxAs the evaluation basis of the other offline engine squeal noise levels. For example, for the offline engine (No. 3624), the normalized howling noise corresponding to each rotational speed in the above rotational speed range is calculated. The normalized squeal noise for the offline engine is then compared to the maximum normalized squeal noise over the speed range, as shown in FIG. 5.
If at allAt rotational speed LG_order<LG_order_maxIf the engine is qualified, otherwise, if the engine is not qualified, the engine needs to be checked by returning the line. It can be seen from fig. 5 that the normalized squeal noise of the off-line engine is greater than the normalized squeal noise at the rotation speeds of 2650rpm and 3300rpm, and therefore, the off-line engine is not qualified.
Aiming at the howling noise evaluation method provided by the embodiment, the embodiment of the application also provides a howling noise evaluation device.
Referring to fig. 6, fig. 6 is a device for evaluating howling noise according to an embodiment of the present application. As shown in fig. 6, howling noise evaluation apparatus 600 includes acquisition section 601 and determination section 602:
the acquiring unit 601 is used for acquiring a total noise value and an order noise of the target engine;
the determining unit 602 is configured to determine a howling noise correction coefficient of the target engine according to the total noise value and a sample total noise value of at least one sample engine; wherein the sample engine is a full vehicle based engine that assesses complaints;
the determining unit 602 is further configured to determine a normalized howling noise of the target engine according to the order noise and the howling noise correction coefficient.
In a possible implementation manner, the determining unit 602 is further configured to:
if the normalized howling noise is larger than the maximum normalized howling noise, determining that the target engine is unqualified; wherein the maximum normalized howling noise is determined based on the sample engine.
In a possible implementation manner, the obtaining unit 601 is further configured to:
acquiring a total noise value of N sample engines, wherein N is greater than or equal to 1;
the apparatus further comprises a computing unit:
and the calculating unit is used for calculating the average value of the noise total values of the N sample engines and taking the average value as the sample noise total value.
In a possible implementation manner, the obtaining unit 601 is further configured to:
obtaining order noise of the N sample engines;
the determining unit 602 is further configured to:
determining the normalized howling noise of the N sample engines according to the total noise values of the N sample engines and the order noise of the N sample engines;
and determining the maximum normalized howling noise according to the normalized howling noise of the N sample engines.
In a possible implementation manner, the obtaining unit 601 is further configured to obtain a noise score of the pending engine;
and if the noise score is larger than a score threshold value, taking the undetermined engine as the sample engine.
In a possible implementation manner, the obtaining unit 601 is further configured to
Acquiring normalized squeal noise of a target engine in a rotating speed range; wherein the rotational speed range is determined based on a minimum rotational speed and a maximum rotational speed;
acquiring the maximum normalized squeal noise of the sample engine in the rotating speed range;
the determining unit 602 is further configured to
And if the normalized squeal noise of the target engine is not greater than the maximum normalized squeal noise in the rotating speed range, determining that the target engine is qualified.
In one possible implementation, the target engine includes a full-vehicle based engine and/or an off-line engine.
The howling noise evaluation device provided by the embodiment acquires the total noise value and the order noise of the target engine. And determining a howling noise correction coefficient of the target engine according to the total noise value and the sample total noise value of at least one sample engine, wherein the howling noise correction coefficient identifies various background noises of the target engine in the test environment. Based on the above, the order noise of the target engine is corrected by using the howling noise correction coefficient, the normalized howling noise of the target engine is determined, various background noises in the order noise of the target engine are eliminated, the influence of various background noises on the howling noise when the howling noise of the engine is evaluated is reduced, and the evaluation accuracy of the howling noise of the engine is improved. Therefore, the normalized engine howling noise can be considered as a result measured under the same test environment, and can be used as an evaluation parameter of the engine howling level for evaluating the engine howling noise.
The embodiment of the present application further provides a device for evaluating howling noise, where the device includes a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to perform the method of the above aspect according to instructions in the program code.
In another aspect, an embodiment of the present application provides a computer-readable storage medium, where the computer-readable storage medium is used to store a computer program, where the computer program is used to execute the method for evaluating howling noise in the foregoing aspect.
Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium may be at least one of the following media: various media that can store program codes, such as read-only memory (ROM), RAM, magnetic disk, or optical disk.
It should be noted that, in the present specification, all the embodiments are described in a progressive manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus and system embodiments, since they are substantially similar to the method embodiments, they are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described embodiments of the apparatus and system are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only one specific embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A howling noise evaluation method is characterized by comprising the following steps:
acquiring a total noise value and order noise of a target engine;
determining a howling noise correction coefficient of the target engine according to the total noise value and a sample total noise value of at least one sample engine; wherein the sample engine is a non-complaint engine based on a full vehicle assessment;
and determining the normalized howling noise of the target engine according to the order noise and the howling noise correction coefficient.
2. The method of claim 1, further comprising:
if the normalized howling noise is larger than the maximum normalized howling noise, determining that the target engine is unqualified; wherein the maximum normalized howling noise is determined based on the sample engine.
3. The method of claim 1, further comprising:
acquiring a total noise value of N sample engines, wherein N is greater than or equal to 1;
and calculating the average value of the noise total values of the N sample engines, and taking the average value as the sample noise total value.
4. The method of claim 3, further comprising:
obtaining order noise of the N sample engines;
determining the normalized howling noise of the N sample engines according to the total noise values of the N sample engines and the order noise of the N sample engines;
and determining the maximum normalized howling noise according to the normalized howling noise of the N sample engines.
5. The method of claim 1, further comprising:
acquiring a noise score of the undetermined engine;
and if the noise score is larger than a score threshold value, taking the undetermined engine as the sample engine.
6. The method of claim 1, further comprising:
acquiring normalized squeal noise of a target engine in a rotating speed range; wherein the rotational speed range is determined based on a minimum rotational speed and a maximum rotational speed;
acquiring the maximum normalized squeal noise of the sample engine in the rotating speed range;
and if the normalized squeal noise of the target engine is not greater than the maximum normalized squeal noise in the rotating speed range, determining that the target engine is qualified.
7. The method of claim 1, wherein the target engine comprises an entire vehicle based engine and/or an off-line engine.
8. A howling noise evaluation device is characterized by comprising an acquisition unit and a determination unit:
the acquiring unit is used for acquiring a total noise value and an order noise of the target engine;
the determining unit is used for determining a howling noise correction coefficient of the target engine according to the total noise value and a sample total noise value of at least one sample engine; wherein the sample engine is a non-complaint engine based on a full vehicle assessment;
the determining unit is further configured to determine the normalized howling noise of the target engine according to the order noise and the howling noise correction coefficient.
9. An apparatus for howling noise evaluation, the apparatus comprising a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to perform the method of any of claims 1-7 according to instructions in the program code.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium is used to store a computer program for performing the method of any one of claims 1-7.
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