Target structure determination method and device for brake friction pair and storage medium

Abstract

The invention provides a target structure determination method and device for a brake friction pair and a storage medium, relates to the technical field of brake friction pairs, and aims to solve the technical problem that it is difficult to precisely design the friction pair based on a new material. The method for determining the target structure of the friction pair comprises the following steps: acquiring thermophysical parameter characteristics of a friction material; according to the thermophysical parameter characteristics, the temperature characteristics of the friction material after absorbing the braking energy are determined; carrying out numerical calculation on the transient temperature rise of the friction pair, and determining a friction material forming the friction pair; and determining a target structure of the friction pair by taking the transient temperature rise parameter of the friction material forming the friction pair and the design size of the friction pair in the limited space as constraint conditions. The method for determining the target structure of the friction pair is suitable for calculating the capacity of the friction pair with nonlinear thermophysical properties, and reference and basis can be provided for the friction pair to select and accurately match new materials.

Description

Technical Field

[0001] The present invention relates to the technical field of brake friction pairs, and in particular to a method, a device and a storage medium for determining a target structure of a brake friction pair. Background Art

[0002] The brake of the transport vehicle converts the kinetic energy of the drive shaft into heat energy through friction between the friction pairs to achieve the purpose of braking the transport vehicle to a stop. With the improvement of the mobility of heavy-load tracked vehicles, high-speed and high-frequency braking have led to increasing braking loads and braking energy borne by the brakes. The friction pair is a heat source and the main heat-conducting element. Insufficient energy capacity will cause the friction pair of the brake to burn out at high temperature.

[0003] Therefore, the energy capacity matching design of the friction pair is a key part of the design of the transport vehicle brake. With the continuous development and maturity of new materials, there are more and more material options for friction pairs. The energy capacity matching design of friction pairs in related technologies cannot reflect the thermal capacity advantages of new materials, and it is difficult to provide accurate guidance on how to choose new materials as friction pair designs. Summary of the invention

[0004] The purpose of the present invention is to provide a method, device and storage medium for determining the target structure of a brake friction pair, so as to solve the technical problem that it is difficult to accurately design the friction pair based on new materials.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] In a first aspect, an embodiment of the present invention provides a method for determining a target structure of a brake friction pair in a limited space, wherein the friction pair includes a static friction plate and a dynamic friction member, wherein the dynamic friction member includes a core plate and a dynamic friction plate arranged on the core plate in an annular belt shape, and the method for determining the target structure of the friction pair includes:

[0007] Obtain the thermophysical parameter characteristics of friction materials;

[0008] Determining the temperature characteristics of the friction material after absorbing braking energy according to the thermophysical parameter characteristics;

[0009] Numerically calculating the transient temperature rise of the friction pair to determine the friction material forming the friction pair;

[0010] The target structure of the friction pair is determined by taking the transient temperature rise parameter of the friction material forming the friction pair and the design size of the friction pair in the limited space as constraint conditions.

[0011] In a second aspect, an embodiment of the present invention provides a target structure determination device for a brake friction pair, wherein the friction pair includes a static friction plate and a dynamic friction member, wherein the dynamic friction member includes a core plate and a dynamic friction plate arranged on the core plate in an annular belt shape, and the determination device includes:

[0012] An acquisition module, used for acquiring the thermophysical parameter characteristics of the friction material;

[0013] A first calculation module, used for determining the temperature characteristic of the friction material after absorbing the braking energy according to the thermophysical parameter characteristic;

[0014] A second calculation module is used to perform numerical calculation on the transient temperature rise of the friction pair to determine the friction material forming the friction pair;

[0015] The determination module is used to determine the target structure of the friction pair by taking the transient temperature rise parameter of the friction material forming the friction pair and the design size of the friction pair in the limited space as constraint conditions.

[0016] In a third aspect, an embodiment of the present invention provides an electronic device, including:

[0017] processor; and,

[0018] A memory for storing programs;

[0019] The program includes instructions, and when the instructions are executed by a processor, the processor executes the method according to the exemplary embodiment of the present invention.

[0020] In a fourth aspect, an embodiment of the present invention provides a non-transient computer-readable storage medium, wherein the non-transient computer-readable storage medium stores computer instructions, and the computer instructions are used to cause the computer to execute a method according to an exemplary embodiment of the present invention.

[0021] Among the one or more technical solutions provided in the exemplary embodiments of the present invention, at least one of the following beneficial effects can be achieved.

[0022] The exemplary embodiment of the present invention provides a method for determining the target structure of a friction pair of a brake in a limited space. According to the thermophysical parameter characteristics of the friction material, the temperature characteristics of the friction material after absorbing the braking energy can be obtained, thereby establishing the relationship between the specific heat capacity of the friction material and the energy capacity of the friction pair of the brake; further, the temperature rise of the friction pair under the required braking energy condition is quantitatively calculated, thereby optimizing the material of the friction pair, and then the energy capacity matching and size design of the friction pair structure are carried out by establishing constraint conditions, thereby obtaining the target structure of the friction pair required under the design index. Based on this, the method for determining the target structure of the friction pair of the exemplary embodiment of the present invention can provide a reference and basis for the optimal energy capacity matching of the friction pair in the brake, especially in the compact brake with a limited space.

[0023] Compared with the traditional energy capacity calculation method in the prior art, the energy capacity calculation of the friction pair with nonlinear thermophysical properties has the disadvantage of a large gap with the actual result. The target structure determination method of the friction pair in the exemplary embodiment of the present invention does not perform matching calculation based on the thermophysical parameters of the friction material at room temperature, but is based on the relationship between the specific heat capacity of the friction material and the energy capacity of the friction pair, and quantitatively calculates in combination with the transient temperature rise of the friction pair, thereby overcoming the disadvantage of the prior art that the heat capacity advantage of the new material cannot be reflected. It is suitable for the friction pair of the friction material with nonlinear thermophysical properties, and the energy capacity matching degree of the friction pair is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings illustrate exemplary embodiments of the present invention and together with the description serve to explain the principles of the present invention. These drawings are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this specification.

[0025] Figure 1 is a schematic flow chart of a method for determining a target structure of a friction pair according to an embodiment of the present invention;

[0026] Figure 2 is a schematic structural diagram of a friction pair according to an embodiment of the present invention;

[0027] Figure 3 is a graph of energy absorption per unit volume of friction material when the temperature rises by 1° C. according to an embodiment of the present invention;

[0028] Figure 4 is an analysis diagram of energy capacity characteristics of iron-based powder metallurgy and C / C-SiC friction materials according to an embodiment of the present invention;

[0029] Figure 5 is a heat flow rate curve of the counter-friction surface of the friction pair under the target working condition according to an embodiment of the present invention;

[0030] Fig. 6Ais the maximum temperature of the dynamic friction plates of the two friction materials under the target operating conditions according to an embodiment of the present invention;

[0031] Figure 6B is the average temperature of the dynamic friction plates of the two friction materials under the target operating conditions according to an embodiment of the present invention;

[0032] Figure 6C is the average temperature of the core plates of the two friction materials under the target operating conditions according to an embodiment of the present invention.

[0033] Figure 7 is a schematic block diagram of modules of a determination device according to an embodiment of the present invention;

[0034] Figure 8 is a schematic block diagram of a chip according to an embodiment of the present invention;

[0035] Fig. 9 is a structural block diagram of an electronic device according to an embodiment of the present invention.

[0036] Figure numerals: 10, static friction plate; 21, dynamic friction plate; 22, core plate. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings and implementation modes.

[0038] Before introducing the exemplary embodiments of the present invention, the relevant terms involved in the exemplary embodiments of the present invention are first explained as follows:

[0039] Specific heat capacity: It is the amount of heat absorbed or released when the temperature of a unit mass of a substance rises or falls by 1 degree. It is represented by the symbol c and its unit is joule per kilogram Kelvin (J / (kg·K)).

[0040] Heat capacity: It is the amount of heat absorbed or released by a substance when its temperature rises or falls by 1 degree. It is usually represented by the symbol C and its unit is joule per Kelvin (J / K).

[0041] Energy Capacity: It is the energy absorbed by a component when the ambient temperature rises to the target temperature.

[0042] In recent years, the preparation technology of non-metallic composite friction materials such as C / C and C / C-SiC has become more and more mature. They have the characteristics of light weight and high heat resistance. The thermal physical parameters such as specific heat capacity and thermal conductivity of such non-metallic composite friction materials vary greatly with temperature. For example, when the powder metallurgy friction pair materials are high temperature resistant steel and powder metallurgy friction materials, the specific heat capacity of these two materials is less affected by temperature, and the maximum specific heat capacity / minimum specific heat capacity measured is 1.5 times; while the maximum specific heat capacity / minimum specific heat capacity measured by C / C-SiC material is 5.4 times. In the process of calculating energy capacity, the specific heat capacity of powder metallurgy friction pair materials can be calculated as a constant value. If it is applied to materials such as C / C-SiC whose thermal physical parameters vary greatly with temperature, the calculation structure is far from the actual result, and it cannot reflect the heat capacity advantage of non-metallic composite friction materials such as C / C and C / C-SiC.

[0043] The target structure determination method of the brake friction pair of the exemplary embodiment of the present invention is particularly suitable for a vehicle that is a brake friction pair in a limited space, such as a heavy-load tracked vehicle.

[0044] The method provided in the embodiment of the present invention may be executed by a terminal with a display function. The terminal may be a mobile phone, a tablet computer, a wearable device, a vehicle-mounted device, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, a PDA, and a wearable device based on augmented reality (AR) and / or virtual reality (VR) technology.

[0045] The target structure determination method of a brake friction pair in a limited space provided by an exemplary embodiment of the present invention is executed by a terminal or a chip applied in the terminal. The scheme of the present invention is described below with reference to the accompanying drawings.

[0046] In the target structure determination method of the brake friction pair in a limited space provided by the exemplary embodiment of the present invention, the friction pair includes a static friction plate 10 and a dynamic friction member, and the dynamic friction member includes a core plate 22 and a dynamic friction plate 21 arranged on the core plate 22 in an annular belt shape, such as Figure 2 As shown, it is suitable for heavy-load tracked vehicles and is one of the friction pairs in dry plate brakes, wherein Figure 2 Schematic diagram of the structure of a friction pair according to an embodiment of the present invention.

[0047] Compared with heavy-loaded tracked vehicles, in the fields where C / C-SiC friction materials are used, such as aircraft wheel brake mechanisms, the structure of the friction pair is different from that of heavy-loaded tracked vehicles, and there is no need to consider the high-temperature failure of the core plate 22 in the dynamic friction part, where the core plate 22 is made of high-temperature resistant steel.

[0048] Figure 1 FIG. 1 is a flow chart of a method for determining a target structure of a friction pair according to an embodiment of the present invention. Figure 1 As shown, a method for determining a target structure of a brake friction pair in a limited space according to an exemplary embodiment of the present invention includes the following steps.

[0049] Step 101: Obtain the thermophysical parameter characteristics of the friction material.

[0050] Step 102: Determine the temperature characteristics of the friction material after absorbing the braking energy according to the thermophysical parameter characteristics.

[0051] Considering that specific heat capacity is a characterization of the braking energy that can be absorbed by the friction material under the same mass, and the brake friction pair of the present invention is used for the brake of a heavy-loaded tracked vehicle, the space is compact and limited. By comparing the braking energy that can be absorbed by the friction material under the same volume, a friction pair design that is more in line with the actual situation can be obtained, and then the optimal friction pair structure can be obtained.

[0052] Step 1021: Calculate the energy that a unit volume of the friction material can absorb when the temperature rises by 1° C. based on the thermophysical parameter characteristic c(T) of the friction material and Formula 1.

[0053] C(T)=c(T)ρ, Formula 1,

[0054] Where: C(T) is the energy that can be absorbed by the friction material per unit volume when the temperature rises by 1°C, c(T) is the specific heat capacity of the friction material at different temperatures, and ρ is the density of the friction material.

[0055] Step 1022: According to the following formula 2, calculate the average body temperature (average temperature of the geometric body) of the friction pair with the same volume after absorbing different braking energies.

[0056]

[0057] Where: T2 is the average temperature of the friction element after absorbing braking energy, T1 is the initial temperature of the friction element, Q is the braking energy, and m is the mass of the friction element.

[0058] The friction element mentioned above may be a static friction plate 10, a dynamic friction plate 21, a core plate 22 or a friction pair, etc.

[0059] According to Formula 1 and Formula 2, the dynamic friction plate 21 is calculated by using Matlab program to obtain the average body temperature of the friction pairs of different friction materials after absorbing the braking energy.

[0060] Step 103: numerically calculate the transient temperature rise of the friction pair to determine the friction material forming the friction pair.

[0061] For example, using transient heat transfer finite element, the transient thermal module in Ansys performs numerical calculation on the transient temperature rise of the friction pair:

[0062] Step 1031: Define the variation of specific heat capacity and thermal conductivity of the friction material with temperature.

[0063] Step 1032: Convert the braking energy under the target working condition into a heat flow rate, wherein the target working condition is the braking energy required when the vehicle where the brake is located is braked to a stop.

[0064] Step 1033: define the outer wall surface of the friction pair as a forced convection heat dissipation surface in the time domain, wherein the outer wall surface of the friction pair refers to: the outer surface of the geometric structure of the friction pair that contacts the air.

[0065] Step 1034: assigning a convection heat dissipation coefficient to the outer wall surface of the friction pair, and defining the friction surfaces of the static friction plate 10 and the dynamic friction plate 21 as friction surfaces without heat dissipation.

[0066] Step 1035 : Calculate the temperature rise parameters of different friction materials at each time, the temperature rise parameters including at least one of the maximum temperature and average temperature of the dynamic friction plate 21 , the maximum temperature and average temperature of the static friction plate 10 , and the average temperature of the core plate 22 .

[0067] It can be seen from the above that the appropriate friction material can be selected according to the design requirements and the temperature rise parameters of different friction materials at the above-mentioned various moments.

[0068] Step 104: Determine the target structure of the friction pair using the transient temperature rise parameter of the friction material forming the friction pair and the design size of the friction pair in a limited space as constraint conditions.

[0069] As Figure 2 Taking the friction pair shown as an example, its main design dimensions include the inner diameter r and outer diameter R of the dynamic friction plate 21 and the axial width w of the dynamic friction member.

[0070] Other constraints for determining the target structure of the friction pair include:

[0071] A. Friction pair energy capacity constraints:

[0072] 1) The maximum temperature of the friction surfaces (the friction surfaces of the dynamic friction plate 21 and the static friction plate 10) does not exceed the failure temperature of the friction material;

[0073] 2) The average temperature of the dynamic friction plate 21 and the connecting structure (such as rivets, core plate 22) does not exceed the long-term operating allowable temperature of the friction material.

[0074] B. The constraints for the design of the inner diameter r of the dynamic friction plate 21 are:

[0075] 1) Friction pair energy capacity constraint;

[0076] 2) Maximum surface pressure constraint on the friction surface (brake's actuating capacity).

[0077] C. The constraints for the design of the outer diameter R of the dynamic friction plate 21 are:

[0078] 1) Minimum surface pressure on the friction surface;

[0079] 2) Maximum allowable linear speed of the friction pair;

[0080] 3) Maximum design space and design quality;

[0081] 4) The ratio of the inner diameter r to the outer diameter R of the dynamic friction plate 21 is not less than 0.6.

[0082] D. The design constraint of the axial width w of the friction pair is:

[0083] 1) Friction pair energy capacity constraint;

[0084] 2) Meet the design requirements of friction pair wear under life indicators;

[0085] 3) Design space and design quality.

[0086] It can be seen from the above that the application environment of the target structure determination method of the brake friction pair provided by the exemplary embodiment of the present invention is different from the traditional brake environment. The traditional target structure determination method generally analyzes the energy that can be absorbed by the friction material under the same mass. It is generally believed that carbon ceramic materials have high energy capacity. For the purpose of lightweight design, carbon ceramic materials are used in large quantities.

[0087] However, in some brake environments with compact design space, such as the tracked vehicle brake of the present invention, due to limited design space, the traditional friction pair target structure determination method cannot meet the requirements of the design space. The target structure determination method of the brake friction pair provided by the exemplary embodiment of the present invention is more suitable for guiding designers to evaluate friction materials by comparing and calculating the energy that can be absorbed by the friction pairs of brakes of different materials under the same design space. Based on this, for the traditionally recognized carbon ceramic material, due to its low density and less energy absorption, it needs to be used in moderation in the limited space of the tracked vehicle, rather than in large quantities as traditionally recognized.

[0088] The method for determining the target structure of a brake friction pair in a limited space provided by an exemplary embodiment of the present invention is further described below in conjunction with a specific embodiment.

[0089] Step (1): Analyze the energy capacity characteristics of iron-based powder metallurgy and C / C-SiC friction materials.

[0090] According to the thermophysical parameters of the friction material and formula 1, the energy absorbed by the friction material per unit volume when the temperature rises by 1°C is calculated. The calculation results are as follows: Figure 3 As shown, Figure 3 FIG. 4 is a graph showing energy absorption per unit volume of friction material when the temperature rises by 1° C. according to an embodiment of the present invention.

[0091] Depend on Figure 3 It can be seen that although the specific heat capacity of C / C-SiC friction material is high, due to its low density, at the same volume, at low temperature (less than or equal to 700°C), the heat capacity of C / C-SiC friction material is low. When the temperature is above 700°C, the heat capacity of C / C-SiC friction material reaches the heat capacity level of iron-based powder metallurgy.

[0092] Step (2): Based on the friction material thermophysical parameter c(T) and equation 2, the Matlab program is used to calculate Figure 2 The dynamic friction plate 21 in the embodiment is calculated to obtain the average body temperature of the friction pairs of different materials with the same volume after absorbing the braking energy.

[0093] The calculation procedure of the energy capacity characteristics of the iron-based powder metallurgy dynamic friction plate 21 is as follows:

[0094] clc

[0095] clear all

[0096] close all

[0097] m=1.9688; T1=60; T2=T1; i=1;

[0098] T=[25 100 200 300 400 500 600 700 800];

[0099] c=[575 660 775 837 872 920 958 871 848];

[0100] T2out = []; q = 100;

[0101] for Q=0:q:1500000

[0102] T2out(i) = T2;

[0103] c1=interp1(T,c,T2,'linear');

[0104] T2=T2+q / m / c1;

[0105] i=i+1;

[0106] end

[0107] Q=0:q:1500000;

[0108] plot(Q,T2out)

[0109] The calculation procedure of the energy capacity characteristic of the dynamic friction plate 21 of C / C-SiC friction material is as follows:

[0110] clc

[0111] clear all

[0112] close all

[0113] m=0.7875; T1=60; T2=T1; i=1;

[0114] T=[-106 107 247 700 1000 1200];

[0115] c=[399.84 472.27 1266.93 2180 2180 2180];

[0116] T2out = []; q = 100;

[0117] for Q=0:q:1500000

[0118] T2out(i) = T2;

[0119] c1=interp1(T,c,T2,'linear');

[0120] T2=T2+q / m / c1;

[0121] i=i+1;

[0122] end

[0123] Q=0:q:1500000;

[0124] plot(Q,T2out)

[0125] The calculation results are as follows Figure 4 As shown, it can be seen that for the same volume of dynamic friction plate 21, as the braking energy increases, the temperature rise of the C / C-SiC material dynamic friction plate 21 is higher than the temperature rise of the iron-based powder metallurgy friction plate, wherein, Figure 4 is an analysis diagram of energy capacity characteristics of iron-based powder metallurgy and C / C-SiC friction materials according to an embodiment of the present invention.

[0126] Step (3): Use the Transient thermal module in Ansys to numerically calculate the transient temperature rise of the friction pair and define the changes in the specific heat capacity and thermal conductivity of the friction material with temperature.

[0127] The braking test condition (target condition) is set to a 26.5-ton vehicle, braking from a speed of 85 km / h to a stop at a deceleration of 5 m / s2, braking once within one minute, and a total of three braking operations.

[0128] The brake converts 90% of the braking energy into heat energy, which is absorbed by the friction pair. Among them, the heat flow rate of the static friction plate 10 and the dynamic friction part is consistent, and the heat flow rate flowing into the dynamic friction part is as follows: Figure 5 As shown, Figure 5 is a heat flow rate curve of the counter-friction surface of the friction pair under the target working condition according to an embodiment of the present invention.

[0129] The outer wall surface of the friction pair is defined as a forced convection heat dissipation surface. When the dynamic friction plate 21 and the static friction plate 10 are rubbed against each other, heat dissipation is not calculated on the rubbing surfaces.

[0130] After the calculation is completed, the maximum temperature and average temperature of the dynamic friction plate 21 and the average temperature of the core plate 22 at each moment are extracted. The results are as follows: Figure 6A-6C As shown, Fig. 6A is the maximum temperature of the dynamic friction plates of the two friction materials under the target operating conditions according to an embodiment of the present invention; Figure 6B is the average temperature of the dynamic friction plates of the two friction materials under the target operating conditions according to an embodiment of the present invention; Figure 6C is the average temperature of the core plates of the two friction materials under the target operating conditions according to an embodiment of the present invention.

[0131] Depend on Figure 6A-6C It can be seen that the sintering temperature of iron-based powder metallurgy friction plate is between 1000℃ and 1100℃. Exceeding this temperature will lead to the loss of brake function. The upper limit of long-term working temperature is 550℃. C / C-SiC friction material has high temperature resistance and still has braking ability at 1600℃. The upper limit of long-term working temperature is 700℃. For this reason, C / C-SiC friction material is selected as the material of friction pair.

[0132] It should be noted that during the vehicle braking process, in order to prevent oxidation of the C / C-SiC friction material, the average temperature of the C / C-SiC friction material body needs to be controlled below 700°C. Within the working temperature range below 700°C, the temperature of the C / C-SiC dynamic friction plate 21 absorbing the same braking energy is higher, but since the heat treatment temperature of the steel core plate 22 is low, it is necessary to use the steel core plate 22 to increase the energy capacity, and prevent the average temperature of the steel core plate 22 from being too high. For this reason, it is necessary to adjust the volume ratio of the dynamic friction plate 21 and the core plate 22, and design with weight reduction and high energy capacity as the optimization goals.

[0133] Step (4): The main design dimensions of the friction pair include the inner diameter r, the outer diameter R of the dynamic friction plate 21 and the axial width w of the dynamic friction member.

[0134] Other constraints for determining the target structure of the friction pair include:

[0135] A. Friction pair energy capacity constraints:

[0136] 1) The maximum temperature of the friction surface (the friction surface of the dynamic friction plate 21 and the static friction plate 10) does not exceed 2000°C;

[0137] 2) The average temperature of the dynamic friction plate 21 during long-term operation shall not exceed 1600°C, and the average temperature of the core plate 22 during long-term operation shall not exceed 800°C, so as to prevent annealing from causing a decrease in material properties.

[0138] As can be seen from the above, it is necessary to consider the short-term maximum temperature and long-term average temperature of the friction surface, otherwise it may cause the iron-based friction pair to burn or even sinter together. For the C / C-SiC material friction pair surface, high temperature may cause material oxidation. For the connection structure of the C / C-SiC dynamic friction plate 21 and the core plate 22 (steel material), although the dynamic friction plate 21 can withstand high temperatures, due to the low heat treatment temperature of the core plate 22, it is necessary to use the core plate 22 to increase the energy capacity and prevent the average temperature of the core plate 22 from being too high.

[0139] B. Constraints for the design of the inner diameter r of the dynamic friction plate 21:

[0140] 1) Friction pair energy capacity constraint;

[0141] 2) The maximum surface pressure constraint of the friction surface. Specifically, the small diameter of the friction surface leads to a small friction radius. In order to achieve the same braking force, the positive pressure needs to be increased, which will increase the requirements for the braking control performance;

[0142] 3) Design space constraints. Specifically, for dry disc brakes, since they are sleeved on a shaft, the diameter of the shaft is the lower limit of the inner diameter r of the friction surface.

[0143] C. The constraints for the design of the outer diameter R of the dynamic friction plate 21 are:

[0144] 1) Minimum surface pressure on the friction surface. Specifically, a small positive pressure will lead to friction instability and poor controllability of braking operation;

[0145] 2) Maximum allowable linear speed of the friction pair;

[0146] 3) Maximum design space and design quality;

[0147] 4) The ratio of the inner diameter r to the outer diameter R of the dynamic friction plate 21 is not less than 0.6.

[0148] D. The design constraint of the axial width w of the friction pair is:

[0149] 1) Friction pair energy capacity constraint; Specifically, for dynamic friction parts composed of multiple materials, the proportion of high energy capacity materials should be increased. For example, the dynamic friction plate 21 and the steel core plate 22 made of C / C-SiC material should increase the volume content of steel while meeting the structural strength and quality indicators;

[0150] 2) Meet the design requirements for the wear of the friction pair under the life index; specifically, the design requirements for the axial size of the friction pair;

[0151] 3) Design space and design quality.

[0152] It can be seen from the above that the target structure determination method of the brake friction pair in a limited space provided by the exemplary embodiment of the present invention can quantitatively calculate the temperature rise of the friction pair with nonlinear thermophysical characteristics, and can determine the optimal material proportion and structural size of the friction pair based on the calculation results.

[0153] The above is an introduction to the scheme provided by the embodiment of the present invention. It is understandable that, in order to achieve the above functions, it includes hardware structures and / or software modules corresponding to the execution of each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present invention can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0154] The embodiment of the present invention can divide the terminal into functional units according to the above method example. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiment of the present invention is schematic and is only a logical function division. There may be other division methods in actual implementation.

[0155] In the case of dividing each functional module according to each function, an exemplary embodiment of the present invention provides a device for determining a brake friction pair in a limited space. The friction pair includes a static friction plate and a dynamic friction member, and the dynamic friction member includes a core plate and a dynamic friction plate arranged on the core plate in an annular belt shape. Figure 7 is a schematic block diagram of a module of a determination device according to an embodiment of the present invention. Figure 7 As shown, the brake friction pair determination device 700 includes:

[0156] An acquisition module 701 is used to acquire the thermophysical parameter characteristics of the friction material;

[0157] A first calculation module 702 is used to determine the temperature characteristics of the friction material after absorbing the braking energy according to the thermophysical parameter characteristics;

[0158] A second calculation module 703 is used to perform numerical calculation on the transient temperature rise of the friction pair to determine the friction material forming the friction pair;

[0159] The determination module 704 is used to determine the target structure of the friction pair by taking the transient temperature rise parameter of the friction material forming the friction pair and the design size of the friction pair in the limited space as constraint conditions.

[0160] As a possible implementation method, the second calculation module 703 is also used to calculate the temperature rise parameters of different friction materials at each moment, and the temperature rise parameters include at least one of the maximum temperature and average temperature of the dynamic friction plate, the maximum temperature and average temperature of the static friction plate and the average temperature of the core plate.

[0161] As a possible implementation manner, the second calculation module 703 is further configured to calculate the transient temperature rise of the friction pair by using a transient heat transfer finite element method.

[0162] As a possible implementation, the second calculation module 703 is also used to assign specific heat capacity and thermal conductivity of the friction material to change with temperature, thereby converting the braking energy under the target working condition into heat flow rate, wherein the target working condition is the braking energy required for the vehicle on which the brake is located to brake to a stop.

[0163] As a possible implementation, the second calculation module 703 is further used to assign a convection heat dissipation coefficient to the outer wall surface of the friction pair, and define the friction surfaces of the static friction plate and the dynamic friction plate as friction surfaces without heat dissipation.

[0164] As a possible implementation manner, the determination module 704 is further configured to determine the target structure of the friction pair by taking the inner diameter and outer diameter of the dynamic friction plate and the axial width of the dynamic friction member as constraint conditions.

[0165] Figure 8 FIG. 1 shows a schematic block diagram of a chip according to an exemplary embodiment of the present invention. Figure 8 As shown, the chip 800 includes one or more (including two) processors 801 and a communication interface 802. The communication interface 802 can support the server to perform the data sending and receiving steps in the above method, and the processor 801 can support the server to perform the data processing steps in the above method.

[0166] Optional, such as Figure 8As shown, the chip 800 also includes a memory 803, which may include a read-only memory and a random access memory, and provides operation instructions and data to the processor. A portion of the memory may also include a non-volatile random access memory (NVRAM).

[0167] In some embodiments, Figure 8 As shown, the processor 801 performs corresponding operations by calling the operation instructions stored in the memory (the operation instructions may be stored in the operating system). The processor 801 controls the processing operations of any one of the terminal devices, and the processor may also be called a central processing unit (CPU). The memory 803 may include a read-only memory and a random access memory, and provides instructions and data to the processor 801. A portion of the memory 803 may also include NVRAM. For example, in an application, the memory, the communication interface, and the memory are coupled together through a bus system, wherein the bus system may include a power bus, a control bus, and a status signal bus in addition to a data bus. However, for the sake of clarity, in Figure 8 Various buses are labeled as bus system 804 .

[0168] The method disclosed in the above embodiment of the present invention can be applied to a processor or implemented by a processor. The processor may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by an integrated logic circuit of hardware in the processor or an instruction in the form of software.

[0169] The exemplary embodiment of the present invention further provides an electronic device, comprising: at least one processor; and a memory connected to the at least one processor in communication. The memory stores a computer program that can be executed by the at least one processor, and the computer program is used to enable the electronic device to perform a method according to an embodiment of the present invention when executed by the at least one processor.

[0170] Exemplary embodiments of the present invention also provide a non-transitory computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor of a computer, is used to cause the computer to perform a method according to an embodiment of the present invention.

[0171] refer to Fig. 9 , a structural block diagram of an electronic device 900 that can serve as a server or client of the present invention will now be described, which is an example of a hardware device that can be applied to various aspects of the present invention.

[0172] like Fig. 9As shown, the electronic device 900 includes a computing unit 901, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 902 or a computer program loaded from a storage unit 908 into a random access memory (RAM) 903. In the RAM 903, various programs and data required for the operation of the device 900 can also be stored. The computing unit 901, the ROM 902, and the RAM 903 are connected to each other via a bus 904. An input / output (I / O) interface 905 is also connected to the bus 904.

[0173] A plurality of components in the electronic device 900 are connected to the I / O interface 905, including: an input unit 906, an output unit 907, a storage unit 908, and a communication unit 909. The input unit 906 may be any type of device capable of inputting information to the electronic device 900, and the input unit 906 may receive input digital or character information, and generate key signal inputs related to user settings and / or function control of the electronic device. The output unit 907 may be any type of device capable of presenting information, and may include, but is not limited to, a display, a speaker, a video / audio output terminal, a vibrator, and / or a printer. The storage unit 904 may include, but is not limited to, a disk, an optical disk. The communication unit 909 allows the electronic device 900 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks, and may include, but is not limited to, a modem, a network card, an infrared communication device, a wireless communication transceiver, and / or a chipset, such as a Bluetooth™ device, a WiFi device, a WiMax device, a cellular communication device, and / or the like.

[0174] like Fig. 9 As shown, the computing unit 901 can be various general and / or special processing components with processing and computing capabilities. Some examples of the computing unit 901 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, digital signal processors (DSPs), and any appropriate processors, controllers, microcontrollers, etc. The computing unit 901 performs the various methods and processes described above. For example, in some embodiments, the method of the exemplary embodiment of the present invention may be implemented as a computer software program, which is tangibly included in a machine-readable medium, such as a storage unit 908. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 900 via ROM 902 and / or communication unit 909. In some embodiments, the computing unit 901 can be configured to execute the method in any other appropriate manner (e.g., by means of firmware).

[0175] In the context of the present invention, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or equipment. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or equipment, or any suitable combination of the foregoing. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0176] It should be understood by those skilled in the art that the above embodiments are only for the purpose of clearly illustrating the present invention, and are not intended to limit the scope of the present invention. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and these changes or modifications are still within the scope of the present invention.

Claims

1. A method for determining a target structure of a brake friction pair, characterized in that: The friction pair includes a static friction plate and a dynamic friction member, the dynamic friction member includes a dynamic friction plate, and the method for determining the target structure of the friction pair includes: Obtain the thermophysical parameter characteristics of friction materials; Determining the temperature characteristics of the friction material after absorbing braking energy according to the thermophysical parameter characteristics; Numerically calculating the transient temperature rise of the friction pair to determine the friction material forming the friction pair; The target structure of the friction pair is determined by taking the transient temperature rise parameter of the friction material forming the friction pair and the design size of the friction pair in a limited space as constraint conditions.

2. The method for determining the target structure of a friction pair according to claim 1, characterized in that: The method of numerically calculating the transient temperature rise of the friction pair to determine the friction material forming the friction pair includes: The temperature rise parameters of the different friction materials at various times are calculated, wherein the temperature rise parameters include at least one of the maximum temperature of the dynamic friction plate, the maximum temperature of the static friction plate and the average temperature.

3. The method for determining the target structure of a friction pair according to claim 1, characterized in that: When performing numerical calculation on the transient temperature rise of the friction pair to determine the friction material forming the friction pair, it also includes: The transient temperature rise of the friction pair is calculated using transient heat transfer finite element method.

4. The method for determining the target structure of a friction pair according to claim 3, characterized in that: The calculation of the transient temperature rise of the friction pair by using the transient heat transfer finite element method includes: The specific heat capacity and thermal conductivity of the friction material are given temperature-dependent changes, so as to convert the braking energy under a target working condition into a heat flux, wherein the target working condition is the braking energy required when the vehicle on which the brake is mounted is braked to a stop.

5. The method for determining the target structure of a friction pair according to claim 3, characterized in that: When the transient heat transfer finite element method is used to calculate the transient temperature rise of the friction pair, it also includes: The outer wall surface of the friction pair is defined as a forced convection heat dissipation surface in the time domain, wherein the outer wall surface of the friction pair refers to: the outer surface of the geometric structure of the friction pair that contacts the air.

6. The method for determining the target structure of a friction pair according to claim 5, characterized in that: When the outer wall surface of the friction pair is defined as a forced convection heat dissipation surface in the time domain, it includes: A convection heat dissipation coefficient is assigned to the outer wall surface of the friction pair, and the friction surfaces of the static friction plate and the dynamic friction plate are defined as friction surfaces without heat dissipation.

7. The method for determining the target structure of a friction pair according to any one of claims 1 to 6, characterized in that: The constraint conditions include the inner diameter and outer diameter of the dynamic friction plate and the axial width of the dynamic friction member.

8. A device for determining a target structure of a brake friction pair, characterized in that: The friction pair includes a static friction plate and a dynamic friction member, the dynamic friction member includes a dynamic friction plate, and the determining device includes: An acquisition module, used for acquiring the thermophysical parameter characteristics of the friction material; A first calculation module, used for determining the temperature characteristic of the friction material after absorbing the braking energy according to the thermophysical parameter characteristic; A second calculation module is used to perform numerical calculation on the transient temperature rise of the friction pair to determine the friction material forming the friction pair; The determination module is used to determine the target structure of the friction pair by taking the transient temperature rise parameter of the friction material forming the friction pair and the design size of the friction pair in a limited space as constraint conditions.

9. An electronic device, characterized in that: include: processor; as well as A memory for storing programs; The program includes instructions, which, when executed by the processor, cause the processor to perform the method according to any one of claims 1 to 7.

10. A non-transitory computer-readable storage medium, characterized in that The non-transitory computer-readable storage medium stores computer instructions for causing the computer to execute the method according to any one of claims 1 to 7.

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