A whole vehicle NVH performance health index evaluation method

Abstract

The present application belongs to the technical field of whole vehicle NVH evaluation, and particularly relates to a whole vehicle NVH performance health index evaluation method; whole vehicle level NVH development target information and current node verification results are acquired; development target item weight assignment is performed; verification results are normalized; a health index is calculated; the present application uses the normalization principle, i.e. using a quantitative parameter to represent the health state of the NVH performance of each development node, monitors the health state course in the whole development cycle NVH performance development, and provides an effective management tool for positive development of the NVH performance.

Description

Technical Field

[0001] This invention belongs to the field of vehicle NVH evaluation technology, specifically relating to a method for evaluating the health index of vehicle NVH performance. Background Technology

[0002] With the development of the automotive industry, users have increasingly higher requirements for vehicle NVH performance. Based on the user-centric development philosophy, major OEMs are raising their NVH performance requirements. Currently, mainstream automotive products are undergoing forward development for NVH performance. NVH engineers assess the health status of product NVH performance at key points during the development process, typically using compliance checks to confirm the achievement of various indicators. However, due to the large number of development indicators and their varying weighting coefficients, it is impossible to form a comprehensive parameter to evaluate the current NVH performance health status. Currently, there is no evaluation method in this field for an NVH performance health index. Summary of the Invention

[0003] To overcome the above problems, this invention provides a method for evaluating the NVH performance health index of a vehicle. It establishes a quantitative health index model using a normalization principle, employing a single quantitative parameter to characterize the health status of NVH performance at each development stage. This method monitors the health status throughout the entire development cycle of NVH performance, providing an effective management tool for positive NVH performance development.

[0004] A method for evaluating the NVH performance health index of a vehicle includes the following:

[0005] The first step is to obtain the vehicle-level NVH development target information and the current node verification results;

[0006] The second step is to assign weights to the target items.

[0007] The third step is to normalize the verification results:

[0008] First, define the allowable standard deviation Δ, which is the allowable range of deviation between the verification result X and the target value T;

[0009] If XT≤0, meaning the verification results meet the development goals, then the normalized score of the corresponding goal is 1;

[0010] If XT≥Δ, that is, the difference between the verification result and the target value exceeds the allowable deviation Δ, then the normalized score of the corresponding target is 0;

[0011] If 0 < XT < Δ, then the normalized score is defined as a linear function: The normalized score of the corresponding target is obtained by using a linear function;

[0012] Step 4: Calculate the health index:

[0013] The health index Hi of each objective is obtained by multiplying the weight coefficient and normalized score of each objective. The overall NVH health index F is obtained by summing all objective health indices.

[0014] The first step involves formulating various development goals and target values ​​T for vehicle-level NVH based on product planning and competitor requirements during the early stages of project development. At a certain stage, the product project organizes an inspection of the current node's NVH performance level to confirm the current NVH performance level and obtain the verification results X for each development goal.

[0015] The development objectives in the first step include wind noise, road noise, powertrain noise, air conditioning system noise, abnormal noises, and regulatory requirements.

[0016] The second step involves big data analysis based on customer feedback, user claims, and IQS data to obtain the weight percentages of wind noise, road noise, powertrain noise, air conditioning system noise, abnormal noise, and regulatory items, and then assigning values ​​to the six development objectives based on these results.

[0017] The weighting percentages for wind noise, road noise, powertrain noise, air conditioning system noise, abnormal noise, and regulatory items are set to 0.1, 0.2, 0.1, 0.1, 0.5, and 1.0, respectively.

[0018] The beneficial effects of this invention are:

[0019] This invention introduces a method for evaluating the NVH performance health status of passenger vehicles. By calculating a comprehensive evaluation parameter, defined as a health index, the health index is used to characterize the NVH performance health status at the current stage. In particular, when a product enters the real vehicle verification stage, a single parameter can be used to monitor the changes in the NVH performance health status during the product quality development process, providing an effective and convenient method for characterizing the NVH performance health status of a product. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0021] Figure 1 This is a normalized function graph of Embodiment 2 of the present invention. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0023] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0026] Example 1

[0027] A method for evaluating the NVH performance health index of a vehicle includes the following:

[0028] The first step is to obtain the vehicle-level NVH development target information and the current node verification results;

[0029] The second step is to assign weights to the target items.

[0030] The third step is to normalize the verification results:

[0031] First, define the allowable standard deviation Δ, which is the allowable range of deviation between the verification result X and the target value T;

[0032] If XT≤0, meaning the verification results meet the development goals, then the normalized score of the corresponding goal is 1;

[0033] If XT≥Δ, that is, the difference between the verification result and the target value exceeds the allowable deviation Δ, then the normalized score of the corresponding target is 0;

[0034] If 0 < XT < Δ, then the normalized score is defined as a linear function: The normalized score of the corresponding target is obtained by using a linear function;

[0035] Step 4: Calculate the health index:

[0036] The health index Hi of each objective is obtained by multiplying the weight coefficient and normalized score of each objective. The overall NVH health index F is obtained by summing all objective health indices.

[0037] The first step involves formulating various development goals and target values ​​T for vehicle-level NVH based on product planning and competitor requirements during the early stages of project development. At a certain stage, the product project organizes an inspection of the current node's NVH performance level to confirm the current NVH performance level and obtain the verification results X for each development goal.

[0038] The development objectives in the first step include wind noise, road noise, powertrain noise, air conditioning system noise, abnormal noises, and regulatory requirements.

[0039] The second step involves big data analysis based on customer feedback, user claims, and IQS data to obtain the weight percentages of wind noise, road noise, powertrain noise, air conditioning system noise, abnormal noise, and regulatory items, and then assigning values ​​to the six development objectives based on these results.

[0040] The weighting percentages for wind noise, road noise, powertrain noise, air conditioning system noise, abnormal noise, and regulatory items are set to 0.1, 0.2, 0.1, 0.1, 0.5, and 1.0, respectively.

[0041] Example 2

[0042] The specific steps of the NVH health index method of this invention are as follows:

[0043] The first step is to obtain the vehicle-level NVH development target table and the current node verification results;

[0044] In the early stages of project development, vehicle-level NVH development goals (T) are formulated based on product planning and competitor requirements. At a certain stage, the product project team organizes a check-up of the current NVH performance level to confirm the current NVH performance level and obtain the verification results (X), as shown in Table 1.

[0045] Table 1. Vehicle NVH Development Goals and Verification Results

[0046]

[0047] The second step is to assign weights to the target items.

[0048] Based on big data analysis of customer feedback, user claims, and IQS data, the weighting percentages of wind noise, road noise, powertrain noise, air conditioning system noise, and abnormal noise were obtained. Values ​​were assigned to the six categories of indicators based on these results. For regulatory requirements where targets must be met, a weighting coefficient of 1.0 was set, as shown in Table 2.

[0049] Table 2. Weighting of Development Goals

[0050]

[0051] The third step is to normalize the verification results:

[0052] First, define the allowable standard deviation Δ, which is the allowable range of deviation between the verification result X and the target value T (different standard deviations are defined according to database statistics for different development target items; usually, the allowable deviation Δ for the sound pressure level index is defined as 5 dBA).

[0053] If XT≤0, meaning the verification results meet the development goals, then the normalization score is 1;

[0054] If XT≥Δ, that is, the difference between the verification result and the target value exceeds the allowable deviation Δ, then the normalized score is 0;

[0055] If 0 < XT < Δ, then the normalized score is defined as a linear function, and the normalized score is obtained through the linear function;

[0056] Taking noise sound pressure level as an example, the standard deviation Δ is defined as 5 dBA. The specific normalization function formula and graph are shown below. Figure 1 Thus, the normalized score F of each development objective item is calculated;

[0057]

[0058] Table 3 Normalized Score of Development Goals

[0059]

[0060] Step 4: Calculate the health index:

[0061] The health index Hi of each objective is obtained by multiplying the weight coefficient and normalized score of each objective. The overall NVH health index F is obtained by summing all objective health indices.

[0062] Table 4 Health Index Table

[0063]

[0064] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the scope of protection of the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, any person skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention within the scope of the technology disclosed in the present invention. These simple modifications are all within the scope of protection of the present invention.

[0065] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0066] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A method for evaluating the NVH performance health index of a vehicle, characterized in that, Includes the following: The first step is to obtain the vehicle-level NVH development target information and the current node verification results; The second step is to assign weights to the target items. The third step is to normalize the verification results: First, define the allowable standard deviation Δ, which is the allowable range of deviation between the verification result X and the target value T; If XT≤0, meaning the verification result meets the development goal, then the normalized score of the corresponding goal is 1; If XT≥Δ, that is, the difference between the verification result and the target value exceeds the allowable deviation Δ, then the normalized score of the corresponding target is 0; If 0 < XT < Δ, then the normalized score is defined as a linear function: The normalized score of the corresponding target is obtained by using this linear function; Step 4: Calculate the health index: The health index Hi of each objective is obtained by multiplying the weight coefficient and normalized score of each objective. The overall NVH health index F is obtained by summing all objective health indices.

2. The method for evaluating the NVH performance health index of a vehicle according to claim 1, characterized in that, The first step involves formulating various development goals and target values ​​T for vehicle-level NVH based on product planning and competitor requirements during the early stages of project development. At a certain stage, the product project organizes an inspection of the current node's NVH performance level to confirm the current NVH performance level and obtain the verification results X for each development goal.

3. The method for evaluating the NVH performance health index of a vehicle according to claim 2, characterized in that, The development objectives in the first step include wind noise, road noise, powertrain noise, air conditioning system noise, abnormal noises, and regulatory requirements.

4. The method for evaluating the NVH performance health index of a vehicle according to claim 1, characterized in that, The second step involves big data analysis based on customer feedback, user claims, and IQS data to obtain the weight percentages of wind noise, road noise, powertrain noise, air conditioning system noise, abnormal noise, and regulatory items, and then assigning values ​​to the six development objectives based on these results.

5. The method for evaluating the NVH performance health index of a vehicle according to claim 4, characterized in that, The weighting percentages for wind noise, road noise, powertrain noise, air conditioning system noise, abnormal noise, and regulatory items are set to 0.1, 0.2, 0.1, 0.1, 0.5, and 1.0, respectively.

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