CN113657006A - Comprehensive evaluation method for deflection quality of rail transit assembly vehicle body - Google Patents
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Abstract
The invention discloses a comprehensive evaluation method for the deflection quality of a rail transit assembly vehicle body, which comprises the steps of collecting and calculating a comprehensive evaluation index for the deflection quality of the rail transit assembly vehicle body, wherein the evaluation index comprises relative deflection data and adjusting force data of each deflection control point of the assembly vehicle body; combining deflection measurement data of each deflection control point of each assembled vehicle body and control point adjusting force data into a comprehensive evaluation matrix; analyzing the comprehensive evaluation matrix by using a principal component analysis method, and calculating to obtain each principal component sequence and corresponding contribution rate of the comprehensive evaluation of the deflection quality of the assembled vehicle body; forming a new matrix by the fraction of each assembled vehicle body sample under each principal component, obtaining the weight of each principal component in the matrix by adopting an entropy weight method, and obtaining the comprehensive evaluation fraction of the deflection quality of each assembled vehicle body; and judging the deflection quality condition of the assembled vehicle body according to the comprehensive evaluation score of the deflection quality of each assembled vehicle body, and guiding the deflection adjustment of the on-site assembled vehicle body.
Description
Technical Field
The invention relates to the technical field of rail transit assembly vehicle body manufacturing, in particular to a comprehensive evaluation method for the deflection quality of a rail transit assembly vehicle body.
Background
With the development of economy in China, the urban scale is continuously enlarged, and the development of urban rail transit becomes a necessary choice for relieving traffic jam in China. The rapid development of urban rail transit drives the leap development of rail transit vehicle manufacturing technology. The deflection of the vehicle body is an important structural performance index of the rail transit vehicle, the vehicle can bear larger vertical load under the condition of carrying passengers, and the vehicle body is deformed in a downwarping mode, so that a certain deflection is required to be preset during manufacturing and assembling of the vehicle body, the whole vehicle body tends to be horizontal when the vehicle body bears the vertical load in the running process, and the service life of the vehicle body is prolonged. In the process of manufacturing and assembling the rail transit vehicle body, the deflection performance index of the vehicle body is gradually emphasized, and higher process requirements are provided in the aspects of vehicle body design, manufacturing process, quality control and the like.
At present, deflection control in the manufacturing process of an assembled vehicle body depends on experience of technicians, the deflection quality condition of the assembled vehicle body is not provided with normative documents for reference, the technicians are difficult to judge the deflection quality condition of the assembled vehicle body, and the deflection control points of the assembled vehicle body need to be measured and adjusted for multiple times, so that the production and manufacturing efficiency of the assembled vehicle body is low, and the deflection adjustment quality of the assembled vehicle body is poor.
In the prior art of the method for comprehensively evaluating the deflection quality of the rail transit assembly vehicle body, the following comparative patents and documents exist:
1) and a power plant comprehensive assessment method based on a principal component analysis method, and has a patent application number of 201910323924.8. The invention discloses a power plant comprehensive assessment method based on a principal component analysis method, which comprises the steps of linearly combining all original assessment index results of n power plants to be assessed to obtain an original linear matrix; calculating a characteristic root and a characteristic vector of the correlation coefficient matrix according to the standardized matrix; and calculating to obtain a principal component matrix and comprehensive assessment scores of all power plants. The method adopts a principal component analysis method to calculate the main influence factors of the examination power plant and calculate the comprehensive index score, but does not consider that the examination score which is caused by taking the principal component variance contribution rate as the weight has stronger subjectivity, and the examination result is easy to cause inaccuracy.
2) And a comprehensive evaluation method of heavy metal contaminated soil remediation effect based on plants, soil and microorganisms, patent application No. 201710255923.5. The invention discloses a comprehensive evaluation method of heavy metal contaminated soil remediation effect based on plants, soil and microorganisms, which comprises the steps of constructing a contaminated soil remediation effect evaluation system; measuring evaluation indexes; normalization processing of evaluation indexes; determining the weight of each evaluation index; the evaluation score of the repaired soil is calculated, the method adopts 14 index layer factors of chemical, microorganism and plant as comprehensive evaluation indexes to evaluate pollution repair work and large-range repair work, but variation degree difference information of each evaluation index can be lost in the normalization process of the evaluation indexes, so that the comprehensive evaluation score is deviated, and the evaluation result is inaccurate.
3) In the comprehensive evaluation method of the thermal power generating unit based on principal component cluster analysis of the 5 th stage of 2017 of Wangbaong and Zhao Dongmei of the university of North China, the reference adopts equivalent available coefficients, operation exposure rate, equivalent forced operation rate and the like as evaluation indexes, and utilizes principal component analysis to simplify index structures and compress information, and adopts a cluster analysis method to analyze each principal component obtained by the principal component analysis method, so as to comprehensively evaluate the quality of the operation state of the thermal power generating unit. However, the evaluation indexes adopted in the literature may have strong independence, and the result obtained by the principal component clustering analysis may have deviation, because the method in the literature is not suitable for the evaluation of the deflection quality of the rail transit vehicle body.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a comprehensive evaluation method for the deflection quality of a rail transit assembly vehicle body.
The purpose of the invention is realized by the following technical scheme:
a rail transit assembly vehicle body deflection quality comprehensive evaluation method comprises the following steps:
a, collecting and calculating a comprehensive evaluation index of the deflection quality of the rail transit assembly vehicle body, wherein the evaluation index comprises relative deflection data omega of each deflection control point of the assembly vehicle bodyaAnd adjusting the force data Fa；
B, combining deflection measurement data of each deflection control point of each assembled vehicle body and control point adjusting force data into a comprehensive evaluation matrix Z;
c, analyzing the comprehensive evaluation matrix Z by using a principal component analysis method, and calculating to obtain the deflection quality heald of the assembled vehicle bodyThe sequences Y of the respective principal components evaluatedkAnd corresponding contribution rate alphak；
D, forming a new matrix Y 'by the fraction of each assembled vehicle body sample under each principal component, and obtaining the weight alpha' of each principal component in the matrix Y 'by adopting an entropy weight method'kAnd obtaining the comprehensive evaluation score of the deflection quality of each assembled vehicle bodyi(ii) a And judging the deflection quality condition of the assembled vehicle body according to the comprehensive evaluation score of the deflection quality of each assembled vehicle body, and guiding the deflection adjustment of the on-site assembled vehicle body.
One or more embodiments of the present invention may have the following advantages over the prior art:
the method uses the relative deflection data and the adjusting force data of each deflection control point of the assembled vehicle body as evaluation indexes to comprehensively evaluate the deflection quality of the assembled vehicle body. The method adopts a principal component analysis method to reduce the dimensionality of the vehicle body deflection quality evaluation index, and adopts an entropy weight method to objectively weight each principal component, so as to enhance the objectivity of the vehicle body deflection quality evaluation. The method can evaluate the quality of the deflection of the assembled vehicle body in the manufacturing process, and has a guiding function on the production and the manufacture of the assembled vehicle body.
Drawings
FIG. 1 is a flow chart of a comprehensive evaluation method for the deflection quality of a rail transit assembly vehicle body;
FIG. 2 is a detailed flow chart of the implementation process of the rail transit assembly vehicle body deflection quality comprehensive evaluation method.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings.
As shown in figure 1, the comprehensive evaluation method for the deflection quality of the rail transit assembly vehicle body comprises the following steps:
30, analyzing the comprehensive evaluation matrix Z by using a principal component analysis method, and calculating to obtain each principal component sequence Y for comprehensively evaluating the deflection quality of the assembled vehicle bodykAnd corresponding contribution rate alphak；
As shown in fig. 2, the step 10 specifically includes:
the deflection control points refer to ten points of two end parts, the middle part and two supporting points of the side beams on two sides of the assembled car body, and actual deflection data omega of each control point'a(a∈[1,10]) The relative deflection data omega of each deflection control point is measured and calculated in real time through a laser displacement sensoraAnd the difference value of the deflection data of each control point relative to the deflection qualified data is obtained.
Establishing a finite element model of the assembled vehicle body based on Hypermesh software, and simulating the adjustment process of the actual assembled vehicle body by applying load at the position of each deflection control point to obtain the integral deflection deformation result of the assembled vehicle body. Setting the influence of the unit adjusting force of the b-th control point of the vehicle body on the deflection deformation of the a-th control point of the vehicle body as gammabaThe adjustment acting force of the b-th control point of the vehicle body is FbThe qualified range of the deflection of the alpha control point is omegaqua[a]∈[ωmin[a],ωmax[a]]And then the deflection of the assembled vehicle body should meet the following requirements:
setting the influence of the unit adjusting force of the b-th control point of the vehicle body on the deflection deformation of the a-th control point of the vehicle body as gammabaAdjustment of the b-th control point of the vehicle bodyForce magnitude of FbThe qualified range of the deflection of the alpha control point is omegaqua[a]∈[ωmin[a],ωmax[a]]And then the deflection of the assembled vehicle body should meet the following requirements:
by solving the above formula, the adjustment force data of each deflection control point can be obtained, as FaRepresenting the vehicle body a control point adjustment force data.
The step 20 specifically includes:
setting an assembled vehicle body evaluation sample as m frames, wherein a combination matrix X is as follows:
performing homotrending transformation and standardization on the combined matrix, eliminating the influence of dimension between different indexes (each column is used as an evaluation index), and setting xijAnd representing the jth evaluation index of the ith sample of the combined matrix, and then synthesizing the evaluation matrix Z:
wherein the content of the first and second substances,
the step 30 specifically includes:
let the characteristic value of the correlation coefficient matrix of the comprehensive evaluation matrix Z be lambda1≥λ2≥…≥λ20Is more than or equal to 0, and the corresponding orthogonalized unit feature vector is t1,t2,…,t20And the kth E [1,20 ] of the comprehensive evaluation of the deflection quality of the assembled vehicle body]A main component sequence YkComprises the following steps:
Yk＝Ztk
contribution of k-th principal component sequenceRate alphakComprises the following steps:
cumulative variance contribution rate
Taking gamma in generalKAnd taking the first K main components corresponding to the time of more than or equal to 0.90 as main component indexes for evaluating the deflection quality of the assembled vehicle body.
The step 40 specifically includes:
each assembly vehicle body sample is arranged in each main component sequence YkThe fraction of (c) constitutes a new matrix Y '═ Y'ik)m×20Wherein y'ik＝αkZitk，ZiAnd an ith sample evaluation index sequence of the comprehensive evaluation matrix Z is shown.
The fraction of the ith sample under the k-th principal component index accounts for the specific gravity pikComprises the following steps:
entropy e of k-th principal component indexkComprises the following steps:
the weight alpha 'of the k-th main component in the matrix Y'kComprises the following steps:
the comprehensive evaluation score of the deflection quality of the ith assembled body sample is as follows:
in this embodiment, table 1 is a data table of actual deflection of each control point of the assembly vehicle body, table 2 is a data table of adjustment force of each control point of the assembly vehicle body, and the sequence of qualified deflection ranges of each point of the assembly vehicle body is (-3.0,0.0,13.0,0.0, -3.0, -3.0,0.0,13.0,0.0, -3.0). Tables 1 and 2 are as follows:
TABLE 1
TABLE 2
And (3) evaluating the deflection quality of the assembled vehicle body by adopting the method by combining the data in the tables 1 and 2. Table 3 lists the eigenvalues, variance contribution ratios and cumulative variance contribution ratios corresponding to each principal component:
TABLE 3
Taking a main component Y1、Y2、Y3、Y4、Y5As the main component index, the comparison table of the comprehensive evaluation results obtained by the entropy weight method is shown in Table 4:
TABLE 4
The evaluation result shows that the deflection quality conditions of the fourth group of assembled vehicle bodies and the seventh group of assembled vehicle bodies are better, the deflection of the two groups of assembled vehicle bodies is closer to the deflection qualified data in actual production and manufacturing, and the deflection quality is better; the deflection quality of the fifth group and the ninth group of assembled vehicle bodies is poor. When the score is integratediThe quality of the deflection of the assembled vehicle body is better when the deflection is less than or equal to 0.060.
Although the embodiments of the present invention have been described above, the above descriptions are only for the convenience of understanding the present invention, and are not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. The comprehensive evaluation method for the deflection quality of the rail transit assembly vehicle body is characterized by comprising the following steps of:
a, collecting and calculating a comprehensive evaluation index of the deflection quality of the rail transit assembly vehicle body, wherein the evaluation index comprises relative deflection data omega of each deflection control point of the assembly vehicle bodyaAnd adjusting the force data Fa；
B, combining deflection measurement data of each deflection control point of each assembled vehicle body and control point adjusting force data into a comprehensive evaluation matrix Z;
c, analyzing the comprehensive evaluation matrix Z by using a principal component analysis method, and calculating to obtain each principal component sequence Y for comprehensively evaluating the deflection quality of the assembled vehicle bodykAnd corresponding contribution rate alphak；
D, forming a new matrix Y 'by the fraction of each assembled vehicle body sample under each principal component, and obtaining the weight alpha' of each principal component in the matrix Y 'by adopting an entropy weight method'kAnd obtaining the comprehensive evaluation score of the deflection quality of each assembled vehicle bodyi(ii) a And judging the deflection quality condition of the assembled vehicle body according to the comprehensive evaluation score of the deflection quality of each assembled vehicle body, and guiding the deflection adjustment of the on-site assembled vehicle body.
2. The method for comprehensively evaluating the deflection quality of the rail transit assembly vehicle body as claimed in claim 1, wherein the deflection control points in the step A are ten points at two end parts, the middle part and two supporting points of the side beams on two sides of the assembly vehicle body, and actual deflection data omega 'of each control point'a(a∈[1,10]) Through real-time measurement and calculation, the relative deflection degree of each deflection control pointAccording to omegaaThe difference value of the deflection data of each control point relative to the deflection qualified data is obtained;
establishing a finite element model of the assembled vehicle body, applying loads at the positions of deflection control points to obtain the integral deflection deformation result of the assembled vehicle body, and setting the influence of the unit adjustment force of the b-th control point of the vehicle body on the deflection deformation of the a-th control point of the vehicle body as gammabaThe adjustment acting force of the b-th control point of the vehicle body is FbThe qualified range of the deflection of the alpha control point is omegaqua[a]∈[ωmin[a],ωmax[a]]And then the deflection of the assembled vehicle body should meet the following requirements:
solving to obtain the adjusting force data of each deflection control point, and taking F as the reference valueaRepresenting the vehicle body a control point adjustment force data.
3. The method for comprehensively evaluating the deflection quality of the rail transit assembly vehicle body according to claim 1, wherein the step B specifically comprises the following steps:
setting an assembled vehicle body evaluation sample as m frames, wherein a combination matrix X is as follows:
performing homotrend transformation and standardization on the combined matrix, and setting xijAnd representing the jth evaluation index of the ith sample of the combined matrix, and then synthesizing the evaluation matrix Z:
wherein the content of the first and second substances,
4. the method for comprehensively evaluating the deflection quality of the rail transit assembly vehicle body as claimed in claim 1, wherein in the step C, the characteristic value of a correlation coefficient matrix of the comprehensive evaluation matrix Z is set to be lambda1≥λ2≥…≥λ20Is more than or equal to 0, and the corresponding orthogonalized unit feature vector is t1,t2,…,t20And the kth E [1,20 ] of the comprehensive evaluation of the deflection quality of the assembled vehicle body]A main component sequence YkComprises the following steps:
Yk＝Ztk
contribution rate α of kth principal component sequencekComprises the following steps:
5. the method for comprehensively evaluating the deflection quality of the rail transit assembly vehicle body according to claim 1, wherein in the step D, each assembly vehicle body sample is subjected to main component sequence YkThe score data of (c) form a new matrix Y ═ Y'ik)m×20Wherein y'ik＝αkZitk，ZiAn ith sample evaluation index sequence representing a comprehensive evaluation matrix Z;
fractional specific gravity p of ith assembly vehicle body sample under k-th main component indexikComprises the following steps:
let the entropy of the k-th principal component index be ekK-th term principal component weight α 'in matrix Y'kComprises the following steps:
ith assembled vehicle body sample scratcherComprehensive evaluation score of degree and qualityiComprises the following steps:
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