Method and system for determining environmental adaptability of construction machinery

Abstract

The present invention discloses a method for determining the environmental adaptability of engineering machinery, comprising: decomposing environmental adaptability factors into levels; determining the weight of each level factor to the upper level factor; establishing an environmental adaptability determination model according to the obtained weight; and determining the environmental adaptability of engineering machinery through the environmental adaptability determination model. The present invention makes an accurate judgment on the environmental adaptability performance of engineering machinery by grading the factors, converting user needs into factors and confirming the weights.

Description

Technical Field

[0001] The present invention belongs to the technical field of engineering machinery environment determination, and in particular, relates to an engineering machinery environmental adaptability determination method and system. Background Art

[0002] The operating environment of construction machinery is complex and the working conditions are harsh. It is often affected by various extreme climates, especially high temperature, high cold and plateau climate environments. With the development of economic globalization, construction machinery products are facing regional and climatic diversity. It is necessary to improve the ability of construction machinery products to withstand the environment, and put forward higher requirements for the environmental adaptability of products. Therefore, it is necessary to judge the environmental adaptability of construction machinery to meet the requirements of the product use environment. Environmental adaptability refers to the requirement that construction machinery products can work normally or not be too damaged under the influence of certain environmental loads in a single environment or a comprehensive environment, and to check whether its various performance elements can meet the predetermined design requirements after testing. However, there is currently no corresponding method to determine the environmental adaptability of construction machinery. Summary of the invention

[0003] In order to solve the problems existing in the prior art, the present invention provides a method for determining the environmental adaptability of an engineering machinery, which can determine the environmental adaptability of the engineering machinery.

[0004] The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0005] In a first aspect, a method for determining environmental adaptability of an engineering machinery is provided, comprising:

[0006] Decompose the environmental adaptability factors into levels;

[0007] Determine the weight of each level of elements to the previous level of elements;

[0008] An environmental adaptability determination model is established according to the obtained weights;

[0009] The environmental adaptability of construction machinery is determined through the environmental adaptability determination model.

[0010] In combination with the first aspect, further, the hierarchical decomposition of the environmental adaptability factors includes: decomposing the environmental adaptability factors into secondary factors, decomposing the secondary factors into tertiary factors, and decomposing the tertiary factors into quaternary factors.

[0011] In combination with the first aspect, further, determining the weight of each layer element to the upper layer element includes:

[0012] The user needs are converted into elements at each level, and the weight of each element is obtained according to the importance of the user needs and the degree of correlation between the needs and the elements.

[0013] In combination with the first aspect, further, the weights of the elements are obtained according to the importance of the user's needs and the degree of association between the needs and the elements, including:

[0014] The importance of the element is obtained by formula (1):

[0015]

[0016] Among them, m is the number of user requirements, n is the number of factors, K i represents the importance of the i-th user demand, r ij Indicates the degree of association between the i-th user demand and the j-th factor;

[0017] The weight of the factor is obtained by formula (2):

[0018]

[0019] W j is the weight of the jth element.

[0020] In combination with the first aspect, further, establishing the environmental adaptability determination model according to the obtained weights includes:

[0021] Establishing a standard set of features;

[0022] An environmental adaptability determination model is established based on element membership and standard sets.

[0023] In combination with the first aspect, further, determining the adaptability of the environment according to the element membership and the standard set includes:

[0024] Formula (3) is used to establish the environmental adaptability determination model

[0025] V(r(x))=10r(x),r(x)∈[0,1] (3)

[0026] x is the measurement value of the fourth-level factor, r is the membership degree, and V is the environmental adaptability score.

[0027] In combination with the first aspect, further, the method further includes correcting the determination result of the environmental adaptability of the construction machinery, specifically:

[0028] According to formula (4), the corrected membership value is obtained

[0029] (SEV)(R)=[r1,r2,…[r(x j )] η ,…,r n ] T (4)

[0030] According to formula (5), the new weighted membership value of environmental adaptability factor is obtained:

[0031] R Σ =W·(SEV)(R),R Σ ∈[0,1] (5)

[0032] According to formula (6), the modified environmental adaptability of engineering machinery is obtained:

[0033] V Σ =V((SEV)(R)),V Σ ∈[0,10] (6)

[0034] Among them, SEV is the severity, η is the severity coefficient, (SEV)(R) is the modified membership value, R Σ The weighted membership value of the element, V Σ is the environmental adaptability of engineering machinery, and W is the weight vector of the factors.

[0035] In a second aspect, a system for determining environmental adaptability of engineering machinery is provided, comprising:

[0036] Environmental adaptability modeling module, used to decompose environmental adaptability elements into hierarchical levels;

[0037] Determine the weight of each level of elements to the previous level of elements;

[0038] An environmental adaptability determination model is established according to the obtained weights;

[0039] The environmental adaptability determination module is used to determine the environmental adaptability of the construction machinery through the environmental adaptability determination model.

[0040] In combination with the second aspect, further, the environmental adaptability modeling module includes:

[0041] An element classification module is used to decompose the environmental adaptability elements into secondary elements, decompose the secondary elements into tertiary elements, and decompose the tertiary elements into quaternary elements;

[0042] The weight confirmation module is used to convert user needs into elements of each layer and obtain the weight of each element according to the importance of user needs and the degree of correlation between needs and elements;

[0043] Environmental adaptability determination model building module, using formula (3) to establish the environmental adaptability determination model

[0044] V(r(x))=10r(x),r(x)∈[0,1] (3)

[0045] x is the measurement value of the fourth-level factor, r is the membership degree, and V is the environmental adaptability score.

[0046] In combination with the second aspect, further, the weight confirmation module obtains the importance of the element through formula (1):

[0047]

[0048] Among them, m is the number of user requirements, n is the number of factors, K i represents the importance of the i-th user demand, r ij Indicates the degree of association between the i-th user demand and the j-th factor;

[0049] The weight of the factor is obtained by formula (2):

[0050]

[0051] W j is the weight of the jth element.

[0052] The beneficial effects of the present invention include: the present invention classifies the factors, converts the user's needs into the factors and confirms the weights, so as to make an accurate judgment on the environmental adaptability performance of the engineering machinery. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a schematic diagram of the hierarchical structure of the elements in the present invention;

[0054] Figure 2 It is a schematic diagram of determining the weights of elements in the present invention;

[0055] Figure 3 It is a flow chart for determining the environmental adaptability of engineering machinery in the present invention. DETAILED DESCRIPTION

[0056] In order to further describe the technical features and effects of the present invention, the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0057] like Figure 1-3 As shown, a method for determining the environmental adaptability of engineering machinery is provided, including the following aspects:

[0058] (1) Determine the factor system for environmental adaptability

[0059] First, the environmental adaptability determination factors are decomposed according to the environmental adaptability requirements of the product. The present invention divides the environmental adaptability determination factors into four levels, and expands the factors level by level according to the logical relationship between each level, such as Figure 1The first-level factor is the environmental adaptability of construction machinery; the second-level factors are high temperature environment adaptability, high cold environment adaptability, plateau environment adaptability and other environmental adaptability; according to the impact of the environment on construction machinery and user needs, the second-level factors are decomposed into third-level factors as required, such as heat dissipation performance, cab cooling performance, low-temperature starting performance, cab defrosting performance, etc.; the last-level factor is the fourth-level factor, which is the lowest-level factor and is used as an input condition to determine the third-level factor. The fourth-level factor should be a factor that can be measured directly or indirectly.

[0060] (2) Determine the weight of environmental adaptability factors of construction machinery

[0061] After the environmental adaptability factor system of engineering machinery is determined, it is necessary to clarify the weight of each level of factors to the upper level factors to characterize the importance of each factor. The present invention first starts from the user's demand for environmental adaptability of engineering machinery, decomposes the user's demand into determined factors, and clarifies the degree of correlation between the user's demand and the determined factors, and calculates the weight of each determined factor based on the importance and correlation. The method for determining the factor weight is as follows: Figure 2 After the user needs are determined, the user needs are classified according to their importance. The present invention classifies the importance of the user needs (denoted as K i ) are divided into 5 levels, as shown in Table 1.

[0062] Table 1 Importance rating and its significance

[0063] <![CDATA[Importance K i > 1 2 3 4 5 significance unimportant General Important More important important Very important

[0064] Determine the degree of correlation between user needs and the determined factors (denoted as r ij ), the levels of correlation are shown in Table 2.

[0065] Table 2. Correlation scores and their significance

[0066]

[0067] The calculation formula for determining the importance of elements is:

[0068]

[0069] Where:

[0070] m——number of user requirements;

[0071] n – determines the number of elements;

[0072] K i ——the importance of user need i;

[0073] r ij ——The degree of association between user need i and certain factor j.

[0074] The weight calculation formula for determining the factors is:

[0075]

[0076] (3) Determine the scoring model for environmental adaptability factors of construction machinery

[0077] Environmental adaptability factor scoring process Figure 3 To establish a definite set of factors, the present invention uses a 10-point system as a reference standard, and its score and rating definition are shown in Table 3.

[0078] Table 3 Factor scores and score definitions

[0079]

[0080] The present invention proposes a membership function method to measure the degree to which an element belongs to good. The membership value (denoted as r(x)) ranges from [0,1]. The larger the membership value, the greater the degree to which it belongs to good. According to the scoring definition, the membership is converted into a 10-point system. The conversion rules are as follows:

[0081] V(r(x))=10r(x),r(x)∈[0,1]……………………(3)

[0082] The present invention involves three types of factors, as shown in Table 4. One is the factor with large characteristics, that is, the larger the factor, the better; one is the factor with small characteristics, that is, the smaller the factor, the better; and one is the intermediate characteristic factor, that is, the factor achieves the best within the specified range. Before constructing the membership function, the critical value of the factor should be determined according to the product performance requirements and life profile.

[0083] Table 4 Three membership functions

[0084]

[0085]

[0086] Substitute the four-level determined factors actually measured into the factor membership function for calculation, and obtain the membership value of each factor R = [r1, r2, ..., r n ] T , and use formula (3) to transform the factors to obtain the environmental adaptability score.

[0087] The determination of product environmental adaptability by the present invention is carried out in the same dimension and at the same level. It can be carried out on a single product, or it can be carried out to compare the advantages and disadvantages of different products at the same level. In the actual use of the product, due to the different environmental severity faced by it, some products have complex mission profile environments and working conditions, while others have good environments and working conditions. The unified determination result cannot truly reflect the environmental adaptability of the product, and the membership value of the determination factor needs to be corrected according to the actual use environment within the product mission profile. The specific method is:

[0088] Define a severity operator (SEV): (SEV)(x) = [r(x)] η The operator SEV is the abbreviation of the first three letters of the English word Severity, where η is the severity coefficient.

[0089] When η=1, (SEV)(x)=[r(x)] η =r(x), which is the membership value under the existing environmental adaptability determination system.

[0090] When the environmental severity faced by the product mission profile is high, it is necessary to strengthen the environmental adaptability determination factors. Use the severity operator to modify certain factors to avoid the environmental adaptability determination factors being too radical. At this time, the severity coefficient η>1, such as η=2, then (SEV)(x)=[r(x)] 2 .

[0091] When the environmental severity faced by the product mission profile is low, it is necessary to weaken the environmental adaptability determination factors. Use the severity operator to correct certain factors to avoid the environmental adaptability determination factors being too conservative. At this time, the severity coefficient η is less than 1, such as η = 12, then (SEV)(x) = [r(x)] 12 .

[0092] Therefore, when the jth factor determined by environmental adaptability needs to be corrected, the new membership value is calculated using the above-mentioned severity operator, and the corrected membership function value is:

[0093] (SEV)(R)=[r1,r2,…[r(x j )] η ,…,r n ] T …………………………(4)

[0094] According to the revised membership value and the weight results of each determination factor, the new weighted membership of the environmental adaptability determination factor is calculated:

[0095] R Σ =W·(SEV)(R),R Σ∈[0,1]………………………(5)

[0096] According to formula (3), the weighted membership is converted into a 10-point scoring value, that is,

[0097] V Σ =V((SEV)(R)),V Σ ∈[0,10]………………………(6)

[0098] The environmental adaptability level of the product elements is determined according to the final score value, where W is the weight vector of the elements, W = (W1, W2, ..., W n ).

[0099] This method first determines the third-level elements based on the fourth-level elements, and then determines the second-level elements based on the results of the third-level elements.

[0100] Finally, the primary factors are determined according to the secondary factor results, and finally the comprehensive determination results of the environmental adaptability of construction machinery are obtained.

[0101] The present invention also provides a system for determining environmental adaptability of engineering machinery, which is used to execute the steps of the method for determining environmental adaptability of engineering machinery, including:

[0102] Environmental adaptability modeling module, used to decompose environmental adaptability elements into hierarchical levels;

[0103] Determine the weight of each level of elements to the previous level of elements;

[0104] An environmental adaptability determination model is established according to the obtained weights;

[0105] The environmental adaptability determination module is used to determine the environmental adaptability of the construction machinery through the environmental adaptability determination model.

[0106] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0107] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0108] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0109] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for determining environmental adaptability of construction machinery, characterized in that: include: Decompose the environmental adaptability factors into levels; Determine the weight of each level of elements to the previous level of elements; An environmental adaptability determination model is established according to the obtained weights; Determine the environmental adaptability of construction machinery through the environmental adaptability determination model; The hierarchical decomposition of the environmental adaptability factors includes: decomposing the environmental adaptability factors into secondary factors, decomposing the secondary factors into tertiary factors, and decomposing the tertiary factors into quaternary factors; Determining the weight of each layer of elements to the upper layer of elements includes: Convert user needs into factors at each level, and obtain the weight of each factor based on the importance of user needs and the degree of correlation between needs and factors; The weights of each factor are obtained based on the importance of user needs and the degree of correlation between needs and factors, including: The importance of the element is obtained by formula (1): （1） in, is the number of user requirements, is the number of elements, Indicates The importance of each user's needs, Indicates User needs and The degree of correlation between the elements; The weight of the factor is obtained by formula (2): （2） For the The weight of each factor; The step of establishing the environmental adaptability determination model according to the obtained weights includes: Establishing a standard set of features; Establish an environmental adaptability determination model based on element membership and standard set; Determining the adaptability of the environment according to the element membership and the standard set includes: Formula (3) is used to establish the environmental adaptability determination model （3） is the measurement value of the fourth-level element, is the degree of membership, Score the adaptability to the environment; It also includes the correction of the determination results of the environmental adaptability of construction machinery, specifically: According to formula (4), the corrected membership value is obtained （4） According to formula (5), the new weighted membership value of environmental adaptability factor is obtained: （5） According to formula (6), the revised environmental adaptability of engineering machinery is obtained: （6） in, For severity, is the severity coefficient, is the corrected membership value, The weighted membership value of the element, For the environmental adaptability of engineering machinery, is the weight vector of the elements.

2. A system for determining environmental adaptability of construction machinery, characterized in that: include: Environmental adaptability modeling module, used to decompose environmental adaptability elements into hierarchical levels; Determine the weight of each level of elements to the previous level of elements; An environmental adaptability determination model is established according to the obtained weights; An environmental adaptability determination module is used to determine the environmental adaptability of the construction machinery through an environmental adaptability determination model; The environmental adaptability modeling module includes: An element classification module is used to decompose the environmental adaptability elements into secondary elements, decompose the secondary elements into tertiary elements, and decompose the tertiary elements into quaternary elements; The weight confirmation module is used to convert user needs into elements of each layer and obtain the weight of each element according to the importance of user needs and the degree of correlation between needs and elements; Environmental adaptability determination model building module, using formula (3) to establish the environmental adaptability determination model （3） is the measurement value of the fourth-level element, is the degree of membership, Score the adaptability to the environment; It also includes the correction of the determination results of the environmental adaptability of construction machinery, specifically: According to formula (4), the corrected membership value is obtained （4） According to formula (5), the new weighted membership value of environmental adaptability factor is obtained: （5） According to formula (6), the revised environmental adaptability of engineering machinery is obtained: （6） in, For severity, is the severity coefficient, is the corrected membership value, The weighted membership value of the element, For the environmental adaptability of engineering machinery, is the weight vector of the elements.

3. A system for determining environmental adaptability of construction machinery according to claim 2, characterized in that: The weight confirmation module obtains the importance of the element through formula (1): （1） in, is the number of user requirements, is the number of elements, Indicates The importance of each user's needs, Indicates User needs and The degree of correlation between the elements; The weight of the factor is obtained by formula (2): （2） For the The weight of an element.

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