A method for characterizing the comprehensive performance of a hob

Abstract

The present invention discloses a method for characterizing the comprehensive performance of a hob, including the selection of hob performance characteristic parameters, the determination of performance characteristic levels, the calculation of parameter influence coefficients, the determination of performance characteristic functions, the comprehensive performance characterization results, and the selection of hob types; the comprehensive performance of the hob is characterized by performance characteristic parameters such as hardness, load-bearing capacity, cutter ring wear resistance, impact resistance / cutter ring toughness; the performance characteristic levels of the hob are characterized by five levels: level I, level II, level III, level IV, and level V; the influence coefficients of different characteristic parameters of the hob in hard rock formations, soft rock formations, and formations with uneven hardness are established by using analytic hierarchy process and expert evaluation; the comprehensive performance characteristic function of the hob is constructed by using trapezoidal membership function or triangular membership function. The present invention can qualitatively and quantitatively characterize the comprehensive performance of the hob, sort and evaluate the comprehensive performance of the hob according to the characterization results, and optimize the type of hob most suitable for the actual engineering project.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel boring machine cutters, and particularly to a method for characterizing the comprehensive performance of cutters. Background Art

[0002] With the construction and development of underground space in China, the application of tunnel boring machines has become increasingly widespread. Cutters are one of the important components of tunnel boring machines. Due to the influence of complex and variable geology, cutters are severely damaged, with a huge consumption, and are costly, which has a great impact on the construction progress and construction cost of engineering projects. At present, the evaluation criteria for cutter performance are not uniform, mainly using a single dimension to characterize cutter performance, without integrating formation characteristics, lacking an effective method to characterize the comprehensive performance of cutters in different formations, and bringing difficulties to the selection of cutter types for engineering projects. Therefore, a method for multi-dimensional characterization of the comprehensive performance of cutters is needed. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a qualitative and quantitative method for characterizing the comprehensive performance of cutters in view of the deficiencies of the prior art.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A method for characterizing the comprehensive performance of cutters includes the following steps:

[0006] 1) Select cutter performance characteristic parameters

[0007] Use hardness, load-bearing capacity, cutter ring wear resistance, impact resistance / cutter ring toughness characteristic parameters to characterize the comprehensive performance of cutters;

[0008] 2) Determine the characteristic levels of cutter performance characteristic parameters

[0009] Use five levels of level I, level II, level III, level IV, and level V to characterize the characteristic levels of cutter performance characteristic parameters;

[0010] 3) Calculate the influence coefficients of cutter performance characteristic parameters

[0011] Use analytic hierarchy process and expert evaluation to establish the influence coefficients of cutter performance characteristic parameters in hard rock formations, soft rock formations, and formations with uneven hardness;

[0012] 4) Determine the characteristic functions of cutter performance characteristic parameters

[0013] Use trapezoidal membership functions and triangular membership functions to construct the characteristic functions of cutter performance characteristic parameters;

[0014] 5) Calculate the comprehensive characterization results of cutter performance characteristic parameters

[0015] The comprehensive characterization results of the hob performance characteristic parameters include the characterization matrix of the hob performance characteristic parameters, the vector results of the hob performance characteristic parameters, and the numerical results of the hob performance characteristic parameters;

[0016] 6) Select the type of hob.

[0017] Preferably, the hob performance characteristic parameter A i , where i is the type of characteristic parameter, i = 1, 2, 3, 4, and the value of A i is collected according to the measurement of the instrument and equipment; A1, A2, A3, and A4 represent hardness, load-carrying capacity, cutter ring wear resistance, and impact resistance / cutter ring toughness respectively;

[0018] (1) The hardness A1 is measured for the hob material using a Rockwell hardness tester, and the measurement accuracy reaches 0.1 HRC;

[0019] (2) The load-carrying capacity A2 is measured for the full-size hob using a comprehensive experimental platform for the action of the hob rock drill and a three-component wireless load sensor, and the measurement accuracy reaches ±0.1 kN;

[0020] (3) The cutter ring wear resistance A3 is measured for the full-size hob using a comprehensive experimental platform for the action of the hob rock drill and a three-dimensional camera measurement system, and the detection accuracy reaches 0.01 mm / m; or the reduced-size hob is measured using a hob composite abrasion experimental platform and a high-precision weighing scale, and the detection accuracy reaches 0.01 g / mm;

[0021] (4) The impact resistance / cutter ring toughness A4 is measured for the hob material using a pendulum impact testing machine, characterized by impact energy and impact toughness, and the detection accuracy reaches ±0.1 J / cm 2 and 0.1 J.

[0022] Preferably, the characteristic grade B of the hob performance characteristic parameter j , where j is the type of characteristic grade, j = 1, 2, 3, 4, 5, and the value of B j is equally divided according to the interval between the maximum and minimum values of A i ; B1, B2, B3, B4, and B5 are respectively used to characterize the characteristic grades of the hob performance characteristic parameters of five grades, namely grade I, grade II, grade III, grade IV, and grade V, where grade I represents the best comprehensive performance of the hob, and grade V represents the worst comprehensive performance of the hob.

[0023] Preferably, use C miThe influence coefficient characterizing the performance characteristic parameters of the hob for different strata, where m represents different strata, m = 1, 2, 3; i is the type of hob performance characteristic parameter, i = 1, 2, 3, 4; three types of strata are selected to characterize the comprehensive performance of the hob, namely hard rock stratum, soft rock stratum, and uneven hard and soft stratum; four characteristic parameters are selected, namely hardness, load-bearing capacity, cutter ring wear resistance, and impact resistance / cutter ring toughness; the influence coefficient C of the hob performance characteristic parameter mi is obtained by taking the average value through analytic hierarchy process and expert evaluation;

[0024] The analytic hierarchy process and expert evaluation refer to judging and calculating the i types of hob performance characteristic parameters for each of the m types of strata, and then obtaining the influence coefficient of the hob performance characteristic parameter. A total of m * i influence coefficients are obtained. The judgment calculation method is the nine-level scale judgment criterion. Through expert evaluation of the importance relationship between each pair of hob performance characteristic parameters A i The forward comparison is represented by a natural number between 1 and 9, and the reverse comparison is its reciprocal;

[0025] By expert evaluation, the judgment matrix of the i types of hob performance characteristic parameters for a certain stratum is constructed, and the influence coefficient C of the hob performance characteristic parameter for different strata is obtained through normalization processing and the square root method mi The value, that is, the influence coefficient of the hob performance characteristic parameter for the hard rock stratum is: C1 = [C 11 C 12 C 13 C 14 ; the influence coefficient of the hob performance characteristic parameter for the soft rock stratum is: C2 = [C 21 C 22 C 23 C 24 ; the influence coefficient of the hob performance characteristic parameter for the uneven hard and soft stratum is: C3 = [C 31 C 32 C 33 C 34 .

[0026] Preferably, for different hob performance characteristic parameters A i different characteristic functions of the hob performance characteristic parameter are selected, mainly including trapezoidal membership function and triangular membership function; when the data of the hob performance characteristic parameter A i is represented by continuous value segmentation, the trapezoidal membership function is adopted; when the data of the hob performance characteristic parameter A i is represented by non-continuous single value, the triangular membership function is adopted,

[0027]

[0028] Where, f(x,a,b,c,d) is a trapezoidal membership function, f(x,a,b,c) is a triangular membership function, a, b, c, d are constants, determined according to the characteristic level of the hob performance characteristic parameter, and x is the hob performance characteristic parameter A. i The value of

[0029] According to the formula, the hob performance characteristic parameter A is established respectively i Characteristic level B for the characteristic parameters of hob performance j The characteristic function of the hob performance characteristic parameters is expressed as f j (A i ) characterization, j is the characteristic level type of the hob performance characteristic parameter, j = 1, 2, 3, 4, 5, construct the characteristic function f of the hob performance characteristic parameter A1-A5 for the characteristic level B1-B5 of the five hob performance characteristic parameters j (A1)-f j (A5).

[0030] Preferably, the specific steps of calculating the comprehensive characterization results of the hob performance characteristic parameters are:

[0031] (1) Characterization matrix of hob performance characteristic parameters

[0032] By constructing the hob performance characteristic parameter A i Characteristic level B for the characteristic parameters of hob performance j The characteristic function f of the hob performance characteristic parameter j (A i ), the performance characteristic parameter A of each hob i Substitute the values ​​of into each characteristic function to obtain each characteristic parameter A i For feature level B j The membership result r i , i is the type of characteristic parameter, i = 1, 2, 3, 4, the characterization matrix of the hob performance characteristic parameters is obtained by matrix transformation, and R k Characterization, k is the type of hob, k = 1, 2, 3...,

[0033] r i =[f1(A i )f2(A i )f3(A i )f4(A i )f5(A i )]

[0034] R k =[r1 r2 r3 r4] T

[0035] In the formula, r i A is each characteristic parameter iFor the membership result of feature level B j where i is the type of feature parameter, i = 1, 2, 3, 4; R k is the characterization matrix of the hob performance feature parameters, k is the type of hob, k = 1, 2, 3 ···;

[0036] (2) The vector result H k of the hob performance feature parameters, k is the type of hob, k = 1, 2, 3 ···,

[0037] H k = C mi × R k

[0038] In the formula, H k is the vector result of the hob performance feature parameters, k is the type of hob, k = 1, 2, 3 ···; C mi is the influence coefficient of the hob performance feature parameters in different strata; R k is the characterization matrix of the hob performance feature parameters; H k needs to be normalized, H k = [h k1 h k2 h k3 h k4 h k5 , h k1 represents the characterization result of the k-th hob performance on the feature level B1;

[0039] (3) The numerical result G k of the hob performance feature parameters, k is the type of hob, k = 1, 2, 3 ···; B j characterizes the feature level of the hob performance feature parameters, j = 1, 2, 3, 4, 5; 100 points, 90 points, 80 points, 70 points, and 60 points are assigned to the five levels of level I, level II, level III, level IV, and level V respectively, where 100 points indicates the best comprehensive performance of the hob and 60 points indicates the worst comprehensive performance of the hob,

[0040] G k = H k × B j

[0041] In the formula, G k is the numerical result of the hob performance feature parameters, H k is the vector result of the hob performance feature parameters, B j characterizes the feature level of the hob performance feature parameters, B j = [100 90 80 70 60] T ; G k characterizes the numerical result of the hob performance feature parameters of the k-th hob in the m-th stratum, G k= 100h k1 + 90h k2 + 80h k3 + 70h k4 + 60h k5 。

[0042] The beneficial effects of the present invention are as follows:

[0043] The present invention can qualitatively and quantitatively characterize the advantages and disadvantages of the comprehensive performance of different hob cutters, realize the evaluation of the comprehensive performance of different hob cutters, sort the comprehensive performance of different hob cutters according to the numerical results of the performance characteristic parameters of the hob cutters, and select the hob cutter most suitable for the actual project; the present invention is a new method for selecting hob cutters under different working conditions, and at the same time has guiding significance for manufacturers to improve the processing and manufacturing quality of hob cutters. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 is a schematic flow chart of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0045] The present invention will be further described below in conjunction with the drawings and embodiments.

[0046] Embodiment 1

[0047] A method for characterizing the comprehensive performance of a hob cutter, as Figure 1 shown, includes the following steps:

[0048] 1) Select the performance characteristic parameters of the hob cutter

[0049] The comprehensive performance of the hob cutter is characterized by the characteristic parameters of hardness, load-bearing capacity, wear resistance of the cutter ring, and impact resistance / toughness of the cutter ring;

[0050] The performance characteristic parameter A of the hob cutter i , where i is the type of characteristic parameter, i = 1, 2, 3, 4, and the value of A i is collected by measuring with instrument equipment; A1, A2, A3, and A4 respectively represent hardness, load-bearing capacity, wear resistance of the cutter ring, and impact resistance / toughness of the cutter ring;

[0051] (1) For hardness A1, a Rockwell hardness tester is used to measure the material of the hob cutter, and the measurement accuracy reaches 0.1 HRC;

[0052] (2) For load-bearing capacity A2, a comprehensive experimental platform for the action of a hob rock drill and a three-component wireless load sensor are used to measure the full-scale hob cutter, and the measurement accuracy reaches ±0.1 kN;

[0053] (3) For wear resistance A3 of the cutter ring, a comprehensive experimental platform for the action of a hob rock drill and a three-dimensional camera measurement system are used to measure the full-scale hob cutter, and the detection accuracy reaches 0.01 mm / m; or a composite abrasion experimental platform for the hob cutter and a high-precision weighing scale are used to measure the reduced-scale hob cutter, and the detection accuracy reaches 0.01 g / mm;

[0054] (4) Impact resistance / knife ring toughness A4 uses a pendulum impact testing machine to measure the hob material, characterized by impact work and impact toughness, and the detection accuracy reaches ±0.1 J / cm 2 and 0.1 J.

[0055] 2) Determine the characteristic grade of the hob performance characteristic parameters

[0056] Use five grades of Grade I, Grade II, Grade III, Grade IV, and Grade V to represent the characteristic grades of the hob performance characteristic parameters;

[0057] The characteristic grade B of the hob performance characteristic parameters j , j is the type of characteristic grade, j = 1, 2, 3, 4, 5, B j The value of is based on A i The interval between the maximum value and the minimum value is equally divided; B1, B2, B3, B4, and B5 are respectively used to represent the characteristic grades of the hob performance characteristic parameters of Grade I, Grade II, Grade III, Grade IV, and Grade V. Among them, Grade I means the best comprehensive performance of the hob, and Grade V means the worst comprehensive performance of the hob.

[0058] The value of Bj is equally divided according to the interval between the maximum value and the minimum value of Ai, and the division results are shown in Table 1.

[0059] Table 1 Characteristic grades of hob performance characteristic parameters

[0060]

[0061] 3) Calculate the influence coefficient of the hob performance characteristic parameters

[0062] Use analytic hierarchy process and expert evaluation to establish the influence coefficients of the hob performance characteristic parameters in hard rock formations, soft rock formations, and uneven hard and soft formations;

[0063] Use C mi to represent the influence coefficients of the hob performance characteristic parameters in different formations. m represents different formations, m = 1, 2, 3; i is the type of hob performance characteristic parameter, i = 1, 2, 3, 4; Three formations are selected to represent the comprehensive performance of the hob, namely hard rock formation, soft rock formation, and uneven hard and soft formation; Four characteristic parameters are selected, namely hardness, load-bearing capacity, knife ring wear resistance, and impact resistance / knife ring toughness; The influence coefficient C of the hob performance characteristic parameters mi The value of is obtained by taking the average according to analytic hierarchy process and expert evaluation;

[0064] Hierarchical analysis and expert evaluation refer to evaluating and calculating the i performance characteristic parameters of each of the m strata, and then obtaining the influence coefficients of the performance characteristic parameters of the hob. A total of m * i influence coefficients are obtained. The evaluation and calculation method is the nine-level scale judgment criterion. Through expert evaluation, the importance relationships between various performance characteristic parameters A of the hob are determined. When comparing two parameters in the positive direction, natural numbers between 1 and 9 are used to represent the importance relationship. When comparing in the reverse direction, it is the reciprocal of the value in the positive direction. 1 indicates equal importance, 3 indicates slightly more important, 5 indicates important, 7 indicates significantly more important, 9 indicates extremely important, and 2, 4, 6, and 8 indicate importance relationships between the above two levels. For example, 3 indicates that in a certain stratum, the wear resistance of the cutter ring is slightly more important than the impact resistance / cutter ring toughness of the hob. i The importance relationships between each pair are represented by natural numbers between 1 and 9 for positive comparison, and the reciprocal for reverse comparison. 1 indicates equal importance, 3 indicates slightly more important, 5 indicates important, 7 indicates significantly more important, 9 indicates extremely important, and 2, 4, 6, and 8 indicate importance relationships between the above two levels. For example, 3 indicates that in a certain stratum, the wear resistance of the cutter ring is slightly more important than the impact resistance / cutter ring toughness of the hob.

[0065] Through expert evaluation, the judgment matrix of the i performance characteristic parameters of the hob for a certain stratum is constructed, and the influence coefficients C of the performance characteristic parameters of the hob for different strata are obtained through normalization processing and the square root method. mi The value of C, that is, the influence coefficient of the performance characteristic parameters of the hob in the hard rock stratum is: C1 = [C 11 C 12 C 13 C 14 ; The influence coefficient of the performance characteristic parameters of the hob in the soft rock stratum is: C2 = [C 21 C 22 C 23 C 24 ; The influence coefficient of the performance characteristic parameters of the hob in the stratum with uneven hardness is: C3 = [C 31 C 32 C 33 C 34 .

[0066] 4) Determine the characteristic function of the performance characteristic parameters of the hob

[0067] The characteristic function of the performance characteristic parameters of the hob is constructed using the trapezoidal membership function and the triangular membership function;

[0068] For different performance characteristic parameters A of the hob i Different characteristic functions of the performance characteristic parameters of the hob are selected, mainly including the trapezoidal membership function and the triangular membership function; for the performance characteristic parameter A of the hob i When the data is represented by continuous value segments, the trapezoidal membership function is used; for the performance characteristic parameter A of the hob i When the data is represented by non - continuous single values, the triangular membership function is used.

[0069]

[0070] Wherein, f(x,a,b,c,d) is a trapezoidal membership function, f(x,a,b,c) is a triangular membership function, a, b, c, and d are constants determined according to the characteristic levels of the hob performance characteristic parameters, and x is the hob performance characteristic parameter A i value;

[0071] According to the formula, respectively establish the hob performance characteristic parameter A i for the characteristic level B of the hob performance characteristic parameter j characteristic function of the hob performance characteristic parameter, represented by f j (A i ), j is the type of characteristic level of the hob performance characteristic parameter, j = 1, 2, 3, 4, 5, and construct the characteristic function f of the hob performance characteristic parameters A1 - A5 for the five characteristic levels B1 - B5 of the five hob performance characteristic parameters according to the above formula and Table 1 j (A1)-f j (A5).

[0072]

[0073] Wherein, f1(A1)-f5(A1) respectively represent the characteristic functions of the hob performance characteristic parameter A1 hardness for the five characteristic levels B j of the five hob performance characteristic parameters, and x is the specific value of the hob performance characteristic parameter A1 hardness. The characteristic functions f of the hob performance characteristic parameters A2 - A5 for the five characteristic levels B1 - B5 of the five hob performance characteristic parameters are constructed in the same way j (A2)-f j (A5).

[0074] 5) Calculate the comprehensive characterization result of the hob performance characteristic parameter

[0075] The comprehensive characterization result of the hob performance characteristic parameter includes the characterization matrix of the hob performance characteristic parameter, the vector result of the hob performance characteristic parameter, and the numerical result of the hob performance characteristic parameter;

[0076] The specific steps for calculating the comprehensive characterization result of the hob performance characteristic parameter are as follows:

[0077] (1) The characterization matrix of the hob performance characteristic parameter

[0078] By constructing the characteristic function f of the hob performance characteristic parameter A i for the characteristic level B of the hob performance characteristic parameter j , substitute the value of the performance characteristic parameter A of each hob into each characteristic function to obtain each characteristic parameter A j (A i ), for the characteristic level B i of the numerical value of each characteristic parameter A i ​j Membership result r i , where i is the type of characteristic parameter, i = 1, 2, 3, 4. The characterization matrix of the hob performance characteristic parameters is obtained through matrix transformation, denoted by R k , k is the type of hob, k = 1, 2, 3 ···,

[0079] r i = [f1(A i ) f2(A i ) f3(A i ) f4(A i ) f5(A i )]

[0080] R k = [r1 r2 r3 r4] T

[0081] In the formula, r i is the membership result of each characteristic parameter A i for the characteristic level B j , i is the type of characteristic parameter, i = 1, 2, 3, 4; R k is the characterization matrix of the hob performance characteristic parameters, k is the type of hob, k = 1, 2, 3 ···;

[0082] Taking a certain hob as an example, substituting A1 = 60 into the characteristic functions f1(A1)-f5(A1) of the characteristic parameter A1 hardness, r1 = [0 0 0 1 1] can be obtained; then substituting A2 - A5 into the corresponding characteristic functions, r2, r3, r4 can be obtained; and the characterization matrix R k of the hob performance characteristic parameters can be obtained.

[0083] (2) Vector result H k of the hob performance characteristic parameters, k is the type of hob, k = 1, 2, 3 ···,

[0084] H k = C mi ×R k

[0085] In the formula, H k is the vector result of the hob performance characteristic parameters, k is the type of hob, k = 1, 2, 3 ···; C mi is the influence coefficient of the hob performance characteristic parameters for different strata; R k is the characterization matrix of the hob performance characteristic parameters; H k needs to be normalized, H k = [h k1 h k2 h k3 h k4 hk5 , h k1 represents the characterization result of the k-th hob performance on the feature level B1;

[0086] (3) The numerical result G of the hob performance characteristic parameters k , where k is the type of hob, k = 1, 2, 3 ···; B j represents the feature level of the hob performance characteristic parameters, j = 1, 2, 3, 4, 5; the five levels of grade I, grade II, grade III, grade IV, and grade V are respectively assigned 100 points, 90 points, 80 points, 70 points, and 60 points, where 100 points indicates the best comprehensive performance of the hob and 60 points indicates the worst comprehensive performance of the hob.

[0087] G k = H k × B j

[0088] In the formula, G k is the numerical result of the hob performance characteristic parameters, H k is the vector result of the hob performance characteristic parameters, B j represents the feature level of the hob performance characteristic parameters, B j = [100 90 80 70 60] T ; G k represents the numerical result of the hob performance characteristic parameters of the k-th hob in the m-th type of formation, G k = 100h k1 + 90h k2 + 80h k3 + 70h k4 + 60h k5 .

[0089] 6) Select the type of hob.

[0090] According to the numerical result G of the hob performance characteristic parameters k , the advantages and disadvantages of the comprehensive performance of different hobs can be qualitatively and quantitatively characterized, the evaluation of the comprehensive performance of different hobs can be realized, the comprehensive performance of different hobs can be sorted according to the characterization result, and the most suitable hob for the actual project can be selected.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solutions of the present invention shall be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for characterizing the comprehensive performance of a hob, characterized in that Including the following steps: 1) Select the performance characteristic parameters of the hob Use the characteristic parameters of hardness, load-bearing capacity, cutter ring wear resistance, impact resistance / cutter ring toughness to characterize the comprehensive performance of the hob; 2) Determine the characteristic grades of the performance characteristic parameters of the hob Use five grades of Grade I, Grade II, Grade III, Grade IV, and Grade V to characterize the characteristic grades of the performance characteristic parameters of the hob; 3) Calculate the influence coefficients of the performance characteristic parameters of the hob Use the analytic hierarchy process and expert evaluation to establish the influence coefficients of the performance characteristic parameters of the hob in hard rock strata, soft rock strata, and strata with uneven hardness; 4) Determine the characteristic functions of the performance characteristic parameters of the hob Use the trapezoidal membership function and the triangular membership function to construct the characteristic functions of the performance characteristic parameters of the hob; 5) Calculate the comprehensive characterization results of the performance characteristic parameters of the hob The comprehensive characterization results of the performance characteristic parameters of the hob include the characterization matrix of the performance characteristic parameters of the hob, the vector results of the performance characteristic parameters of the hob, and the numerical results of the performance characteristic parameters of the hob; The calculation steps are as follows: (1) The characterization matrix of the performance characteristic parameters of the hob By constructing the hob performance characteristic parameter A i Characteristic level B for the characteristic parameters of hob performance j The characteristic function f of the hob performance characteristic parameter j (A i ), the performance characteristic parameter A of each hob i Substitute the values ​​of into each characteristic function to obtain each characteristic parameter A i For feature level B j The membership result r i , i is the type of characteristic parameter, i = 1, 2, 3, 4, the characterization matrix of the hob performance characteristic parameters is obtained by matrix transformation, and R k Characterization, k is the type of hob, k = 1, 2, 3..., r i = [f1(A i ) f2(A i ) f3(A i ) f4(A i ) f5(A i )] R k ＝[r1 r2 r3 r4] T where r i is the characteristic parameter A i For the membership result of the characteristic level B j i is the type of characteristic parameter, i = 1, 2, 3, 4; R k is the characterization matrix of the hob performance characteristic parameters, k is the type of hob, k = 1, 2, 3 ···; (2) Vector result H of hob performance characteristic parameters k , where k is the hob type, k = 1, 2, 3 ··· H k = C mi × R k Where, H k is the vector result of the hob performance characteristic parameters, k is the hob type, k = 1, 2, 3 ···; C mi is the influence coefficient of the hob performance characteristic parameters in different strata; R k is the representation matrix of the hob performance characteristic parameters; H k needs to be normalized, H k = [h k1 h k2 h k3 h k4 h k5 , h k1 represents the representation result of the k-th hob performance on the characteristic level B1; (3) Numerical results G of hob performance characteristic parameters k , where k is the hob type, k = 1, 2, 3 ···; B j represents the characteristic level of the hob performance characteristic parameters, j = 1, 2, 3, 4, 5; for the five levels of level I, level II, level III, level IV, and level V, 100 points, 90 points, 80 points, 70 points, and 60 points are assigned respectively, where 100 points indicates the best comprehensive performance of the hob, and 60 points indicates the worst comprehensive performance of the hob. G k = H k × B j where G k is the numerical result of the hob performance characteristic parameter, H k is the vector result of the hob performance characteristic parameter, B j represents the characteristic level of the hob performance characteristic parameter, B j = [100 90 80 70 60] T ; G k represents the numerical result of the hob performance characteristic parameter of the k-th hob in the m-th formation, G k = 100h k1 + 90h k2 + 80h k3 + 70h k4 + 60h k5 . 6) Select the type of hob according to the comprehensive characterization results of the performance characteristic parameters of the hob.

2. A method for characterizing the comprehensive performance of a hob, as described in claim 1, characterized in that Performance characteristic parameter A of hob i , where i is the type of characteristic parameter, i = 1, 2, 3, 4, A i The value of is collected according to the measurement of instruments and equipment; A1, A2, A3, and A4 represent hardness, load-carrying capacity, cutter ring wear resistance, impact resistance / cutter ring toughness respectively; (1) For hardness A1, use a Rockwell hardness tester to measure the hob material, and the measurement accuracy reaches 0.1 HRC; (2) For load-bearing capacity A2, use a comprehensive experimental platform for hob-rock machine action and a three-component wireless load sensor to measure the full-scale hob, and the measurement accuracy reaches ±0.1 kN; (3) For cutter ring wear resistance A3, use a comprehensive experimental platform for hob-rock machine action and a three-dimensional camera measurement system to measure the full-scale hob, and the detection accuracy reaches 0.01 mm / m; or use a composite abrasion experimental platform for hob and a high-precision weighing scale to measure the reduced-scale hob, and the detection accuracy reaches 0.01 g / mm; (4) Impact resistance / toughness of cutter head The impact resistance of hob materials is measured by a pendulum impact testing machine, characterized by impact energy and impact toughness, and the detection accuracy reaches ±0.1 J / cm 2 and 0.1 J.

3. A method for characterizing the comprehensive performance of a hob, as described in claim 1, wherein Characteristic level B of hob performance characteristic parameters j , where j is the type of characteristic level, j = 1, 2, 3, 4, 5, B j The value of is based on A i The interval between the maximum value and the minimum value is equally divided; B1, B2, B3, B4, and B5 are respectively used to represent the characteristic levels of the hob performance characteristic parameters of five levels: level I, level II, level III, level IV, and level V, where level I indicates the best comprehensive performance of the hob, and level V indicates the worst comprehensive performance of the hob.

4. A method for characterizing the comprehensive performance of a hob, as described in claim 1, characterized in that, Adopt C mi The influence coefficient characterizing the performance characteristic parameters of different cutters in different strata. m represents different strata, m = 1, 2, 3; i is the type of cutter performance characteristic parameters, i = 1, 2, 3, 4; Three kinds of strata are selected to characterize the comprehensive performance of the cutter, namely hard rock stratum, soft rock stratum and uneven hard and soft stratum; Four characteristic parameters are selected, namely hardness, bearing capacity, cutter ring wear resistance, impact resistance / cutter ring toughness; The influence coefficient C of the cutter performance characteristic parameters mi The value of is obtained by taking the average according to the analytic hierarchy process and expert evaluation; Hierarchical analysis and expert evaluation refer to evaluating and calculating the i performance characteristic parameters of each of the m strata, and then obtaining the influence coefficients of the performance characteristic parameters of the hob. A total of m*i influence coefficients are obtained. The evaluation and calculation method is the nine-level scale judgment criterion, and each hob performance characteristic parameter A is evaluated by experts i The important relationship between each pair. The forward comparison is represented by a natural number between 1 and 9, and the reverse comparison is its reciprocal; Construct the judgment matrix of the performance characteristic parameters of a certain type of hob for stratum i through expert evaluation, and obtain the influence coefficient C of the performance characteristic parameters of the hob for different strata through normalization processing and the square root method mi The value, that is, the influence coefficient of the performance characteristic parameters of the hob for hard rock strata is: C1 = [C 11 C 12 C 13 C 14 ; The influence coefficient of the performance characteristic parameters of the hob for soft rock strata is: C2 = [C 21 C 22 C 23 C 24 ; The influence coefficient of the performance characteristic parameters of the hob for strata with uneven hardness is: C3 = [C 31 C 32 C 33 C 34 .

5. A method for characterizing the comprehensive performance of a hob, as described in claim 1, characterized in that For different hob performance characteristic parameters A i Select characteristic functions of different hob performance characteristic parameters, mainly trapezoidal membership functions and triangular membership functions; hob performance characteristic parameter A i When the data is represented by continuous value segments, a trapezoidal membership function is adopted; hob performance characteristic parameter A i When the data is represented by non - continuous single values, a triangular membership function is adopted. where f(x, a, b, c, d) is a trapezoidal membership function, f(x, a, b, c) is a triangular membership function, a, b, c, and d are constants determined according to the characteristic levels of the hob performance characteristic parameters, and x is the value of the hob performance characteristic parameter A i ; Establish the hob performance characteristic parameter A according to the formula respectively i The characteristic level B of the hob performance characteristic parameter j The characteristic function of the hob performance characteristic parameter is represented by f j (A i ), where j is the type of the characteristic level of the hob performance characteristic parameter, j = 1, 2, 3, 4, 5, and construct the characteristic functions f of the hob performance characteristic parameters A1 - A5 for the five characteristic levels B1 - B5 j (A1) - f j (A5).

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