Connection reliability analysis method for door guide bracket

Abstract

The present invention provides a connection reliability analysis method for a door guide groove bracket, comprising setting the door to rotate around the axis of the door hinge at an angular velocity ω when the door is closed, and measuring the moment of inertia I of the lifting glass when the lifting glass rotates around the axis of the door hinge. c Calculate the rotation input energy E of the lifting glass at the bottom dead point; determine the rotation axis of the lifting glass at the moment of closing and locking the door, and measure the rotational inertia I of the lifting glass c1 ; Calculate the angular velocity ω of the lifting glass at the moment of door closing and locking 1 ; Measure the force arm L of the front lower corner point of the lifting glass; calculate the angular acceleration α of the front lower corner point; the force value F of the front lower corner point; compare the force value F with the maximum force value F that can be tolerated by fatigue durability max The connection reliability analysis method of the door guide bracket only needs to input fixed parameters to draw conclusions, and there is no need to build a CAE model for mechanical performance analysis and calculation and structural performance optimization design, which improves the analysis efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of automobile door optimization, and in particular to a connection reliability analysis method for a door guide groove bracket. Background Art

[0002] As an important component of the car door, the car side door glass run channel assembly is mainly used to install the glass rubber strip, which plays a role in maintaining the specific shape of the rubber strip and can also indirectly improve the rigidity of the car door. It is widely used in the design and development of car doors. The existing car door glass run channel assembly consists of a glass run channel bracket and a glass run channel body, which are connected by resistance spot welding; the assembly components are connected to the door inner panel by spot welding through the glass run channel bracket and the glass run channel body, and virtual analysis of weld reliability is required after the design is completed.

[0003] The existing virtual analysis methods have defects, mainly:

[0004] 1. Poor analysis consistency: The analysis results all meet the standard requirements, but after the actual vehicle test, the welding point at the connection between the glass guide bracket and the inner panel often cracks;

[0005] 2. Low analysis efficiency: Complete door data is required for mechanical analysis modeling, which is a large workload and requires dedicated personnel to perform the analysis. The analysis cycle is long, wasting a lot of manpower and material resources. Summary of the invention

[0006] The purpose of the present invention is to provide a connection reliability analysis method for a vehicle door guide channel bracket. The connection reliability analysis method for the vehicle door guide channel bracket only requires the input of fixed parameters to draw a conclusion, and there is no need to build a CAE model to perform analysis and calculation of mechanical properties and optimization design of structural performance, thereby improving analysis efficiency.

[0007] To achieve the purpose of the present invention, the present invention adopts the following technical solutions:

[0008] According to one aspect of the present invention, a connection reliability analysis method for a door guide slot bracket is provided. The door includes a door inner panel, a glass lifter, a lifting glass and a guide slot assembly, wherein the guide slot assembly includes a front guide slot bracket, a front guide slot body and a sealing strip, wherein the front guide slot bracket is connected to the door inner panel, the front guide slot body is connected to the front guide slot bracket, the front guide slot body is elastically connected to the front side of the lifting glass through the sealing strip to support, buffer and guide the front side of the lifting glass, the driving part of the glass lifter is connected to the door inner panel, the lifting glass is slidably connected to the guide rail part of the glass lifter, and the driving part drives the lifting glass to rise and fall along the guide rail part. The connection reliability analysis method for the door guide slot bracket includes setting that the door rotates around the axis of the door hinge at an angular velocity ω when the door is closed, and measuring the moment of inertia I of the lifting glass when it rotates around the axis of the door hinge c Calculate the rotation input energy E of the lifting glass at the bottom dead point; determine the rotation axis of the lifting glass at the moment of closing and locking the door, and measure the rotational inertia I of the lifting glass c1 ; Calculate the angular velocity ω1 of the lifting glass at the moment of door closing and locking; measure the force arm L of the front lower corner point of the lifting glass; calculate the angular acceleration α of the front lower corner point; calculate the force value F of the front lower corner point; compare the force value F with the maximum force value F that can be tolerated by fatigue endurance max Compare and evaluate the reliability of the connection strength between the front guide groove bracket and the door inner panel; when F ≥ F max When F<F max When, it ends.

[0009] According to one embodiment of the present invention, the lifting glass comprises a glass body and a glass bracket connected to the bottom of the glass body, the glass bracket is slidably connected to the guide rail portion, and the method comprises determining the rotation axis of the lifting glass at the moment of closing and locking the door, setting the first fixed point of the rotation axis on the line connecting the front lower corner point and the rear upper corner point of the lifting glass, the distance between the first fixed point and the front lower corner point is S1, and the distance between the first fixed point and the rear upper corner point is S2; measuring the distance S between the front lower corner point and the rear upper corner point; measuring the maximum displacement Y1 of the front lower corner point moving along the left and right direction of the car due to vibration and the maximum displacement Y2 of the rear upper corner point moving along the left and right direction of the car due to vibration; according to the similar triangle theorem And S=S1+S2, the values ​​of S1 and S2 are calculated, that is, the position of the first fixed point is determined, and the line connecting the first fixed point and the constraint center point of the glass body is the rotation axis.

[0010] According to an embodiment of the present invention, the glass body is fixedly connected to the glass bracket by two bolts, and the midpoint of the connection line of the two bolts is the constraint center point of the glass body.

[0011] According to one embodiment of the present invention, the formula for calculating the rotation input energy E of the lifting glass at the bottom dead point is: Among them, I c is the moment of inertia of the lifting glass when it rotates around the axis of the door hinge, and ω is set to 1 rad / s as required.

[0012] According to an embodiment of the present invention, according to the law of conservation of energy, the formula for calculating the angular velocity ω1 of the lifting glass at the moment of door closing and locking is: Among them, I c is the moment of inertia of the lifting glass when it rotates around the axis of the door hinge, ω is set to 1 rad / s as required, I c1 It is the moment of inertia of the lifting glass at the moment of door closing and locking.

[0013] According to one embodiment of the present invention, the formula for calculating the angular acceleration α of the front lower corner point at the moment of door closing and locking is: Wherein, t is the duration of the door closing moment set to 0.01 seconds, and ω1 is the angular velocity of the lifting glass at the moment of door closing and locking.

[0014] According to one embodiment of the present invention, the formula for calculating the force value F of the front lower corner point is: c1 α=FL;where I c1 is the moment of inertia of the lifting glass at the moment of door closing and locking, α is the angular acceleration of the front lower corner point, and L is the force arm of the force F exerted on the front lower corner point of the lifting glass.

[0015] An embodiment of the present invention has the following advantages or beneficial effects:

[0016] The connection reliability analysis method of the door guide groove bracket of the present invention only needs fixed parameters to draw conclusions, and there is no need to build a CAE model to analyze and calculate the mechanical properties and optimize the design of the structural performance, thereby improving the analysis efficiency. Since the lifting glass is irregular and uniform, in order to facilitate the calculation of the moment of inertia of the lifting glass, it is only necessary to input the fixed parameters into the software to establish a data model, and use the integration function in the software to perform measurements and calculations, so that the product design has a basis to rely on and the robustness of the product design is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

[0018] Figure 1 is a schematic structural diagram of a vehicle door according to an exemplary embodiment.

[0019] Figure 2 The figure is a schematic diagram showing a connection reliability analysis method of a door guide channel bracket according to an exemplary embodiment.

[0020] Figure 3 A vehicle door is shown according to an exemplary embodiment Figure 1 Sectional view along line AA.

[0021] Figure 4 A vehicle door is shown according to an exemplary embodiment Figure 1 Sectional view along line BB.

[0022] Figure 5 The invention is a flow chart showing a method for analyzing the connection reliability of a door guide channel bracket according to an exemplary embodiment.

[0023] The reference numerals are described as follows:

[0024] 1. Door inner panel; 2. Guide rail; 3. Lifting glass; 4. Front guide groove body; 5. Front guide groove bracket; 6. Rear guide groove body; 7. Rear guide groove bracket; 8. Sealing strip; 9. Bolt; 10. Door hinge;

[0025] a. Second perpendicular foot; b. Upper rear corner point; c. Lower front corner point; d. First perpendicular foot; e. Constraint center point; o. First fixed point. DETAILED DESCRIPTION

[0026] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0027] The terms "a", "an", "the", and "said" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to indicate an open-ended inclusion and mean that in addition to the listed elements / components / etc., there may be other elements / components / etc. In the present invention, the left-right direction of the automobile is the Y direction, the front-back direction of the automobile is the X direction, and the up-down direction of the automobile is the Z direction.

[0028] like Figures 1 to 5 As shown, Figure 1 A structural schematic diagram of a vehicle door provided by the present invention is shown. Figure 2A schematic diagram of a connection reliability analysis method for a vehicle door guide channel bracket provided by the present invention is shown. Figure 3 The present invention shows a vehicle door Figure 1 Sectional view along line AA. Figure 4 The present invention shows a vehicle door Figure 1 Sectional view along line BB. Figure 5 A flow chart of a method for analyzing the connection reliability of a vehicle door guide channel bracket provided by the present invention is shown.

[0029] The embodiment of the present invention provides a connection reliability analysis method for a door guide groove bracket. The door includes a door inner panel 1, a glass lifter, a lifting glass 3 and a guide groove assembly, the guide groove assembly includes a front guide groove bracket 5, a front guide groove body 4 and a sealing strip 8, the front guide groove bracket 5 is connected to the door inner panel 1, the front guide groove body 4 is connected to the front guide groove bracket 5, the front guide groove body 4 is elastically connected to the front side of the lifting glass 3 through the sealing strip 8 to support, buffer and guide the front side of the lifting glass 3, the driving part of the glass lifter is connected to the door inner panel 1, the lifting glass 3 is slidably connected to the guide rail part 2 of the glass lifter, so that the driving part drives the lifting glass 3 to rise and fall along the guide rail part 2. The connection reliability analysis method for the door guide groove bracket includes setting the door to rotate around the axis of the door hinge 10 at an angular velocity ω when closing the door, and measuring the moment of inertia I of the lifting glass 3 when rotating around the axis of the door hinge 10 c ; Calculate the rotation input energy E of the lifting glass 3 at the bottom dead center; determine the rotation axis of the lifting glass 3 at the moment of closing and locking the door, and measure the rotational inertia I of the lifting glass 3 c1 ; Calculate the angular velocity ω1 of the lifting glass 3 at the moment of closing and locking the door; measure the force arm L of the front lower corner point c of the lifting glass 3; calculate the angular acceleration α of the front lower corner point c; calculate the force value F of the front lower corner point c; compare the force value F with the maximum force value F that can be tolerated by fatigue endurance max Compare and evaluate the reliability of the connection strength between the front guide groove bracket 5 and the door inner panel 1; when F ≥ F max When F<F max When, it ends.

[0030] Among them, the guide groove assembly includes a front guide groove bracket 5, a front guide groove body 4, a rear guide groove bracket 7 and a rear guide groove body 6. The front guide groove body 4 and the front guide groove bracket 5 are welded, and the rear guide groove body 6 and the rear guide groove bracket 7 are welded. The front guide groove body 4, the rear guide groove body 6, the front guide groove bracket 5 and the rear guide groove bracket 7 are respectively welded to the door inner panel 1, and the welding method is resistance spot welding. The sealing strip 8 is clamped between the front guide groove body 4 and the front edge of the lifting glass 3, and between the rear guide groove body 6 and the rear edge of the lifting glass 3, which plays a buffering role when the lifting glass 3 vibrates. The cross-sections of the front guide groove body 4 and the rear guide groove body 6 are both "U"-shaped, so that the front and rear sides of the lifting glass 3 are respectively clamped in the front guide groove body 4 and the rear guide groove body 6, so as to guide the movement direction of the lifting glass 3.

[0031] When the lifting glass 3 is at the top dead center, the front guide groove body 4, the rear guide groove body 6, the top frame of the door, and the inner and outer water cuts of the windowsill constrain the entire edge of the lifting glass 3. When the door is closed in a normal manner, the moment the door lock enters a fully locked state, the vibration of the lifting glass 3 has little effect on the front guide groove bracket 5; when the lifting glass 3 is at the bottom dead center, the front guide groove body 4 and the rear guide groove body 6 constrain the lifting glass 3, and only constrain the front and rear sides of the lifting glass 3, and the upper and lower sides of the lifting glass 3 are not constrained. When the door is closed in a normal manner, the moment the door lock enters a fully locked state, the vibration of the lifting glass 3 has a greater impact on the guide groove. Therefore, when the lifting glass 3 is at the bottom dead center, the moment the door lock enters a fully locked state, the welding point of the front guide groove bracket 5 is most likely to crack.

[0032] When the door is closed and the door lock enters the fully locked state, if the constraint of the guide rail part 2 on the lifting glass 3 is not considered, the movement of the lifting glass 3 rotates around the axis of the door hinge 10, and when the guide rail part 2 constrains the lower end of the lifting glass 3 to limit the lifting of the lifting glass 3 under the guidance of the guide rail part 2, the middle lower end of the lifting glass 3 constrained by the guide rail part 2 is recorded as zero movement distance in the Y direction according to the rigid connection, so that the rotation axis of the lifting glass 3 changes, the front part of the lifting glass 3 moves out of the car, and the rear part of the lifting glass 3 continues to rotate into the car, and then the front guide channel bracket 5 is close to the door hinge 10. The side is subjected to pressure from the lifting glass 3, and the side of the rear guide channel bracket 7 close to the door lock is subjected to tension from the lifting glass 3, which is related to the desoldering of the welding point.

[0033] When closing the door, the door is pushed so that the door receives a rotation input energy E, and the door as a whole rotates around the door hinge 10 at a certain angular velocity ω. According to relevant requirements and the state of normal door closing, the angular velocity is usually set to 1 rad / s, which is smaller than the angular velocity of the door closing of the actual vehicle. At the moment when the door lock enters the fully locked state, the rotation axis of the lifting glass 3 changes. After determining the new rotation axis, the angular velocity ω1 of the lifting glass 3 at the moment when the door lock enters the fully locked state can be obtained according to the law of conservation of energy. Finally, the force value F of the front lower corner point c of the lifting glass 3 at the moment when the door lock enters the fully locked state is obtained by calculation. The force value F is compared with the maximum force value F that can be tolerated by fatigue durability. max By comparison, the reliability of the connection strength between the front guide groove bracket 5 and the door inner panel 1 is evaluated, wherein the maximum force value F max In order to analyze the stress at the front guide channel bracket 5 under specified working conditions, the boundary of the stress value of the welding point of the front guide channel bracket 5 is obtained by combining a large number of actual vehicle test results.

[0034] In a preferred embodiment of the present invention, the formula for calculating the rotation input energy E of the lifting glass 3 at the bottom dead center is: Among them, I c is the moment of inertia of the lifting glass 3 when it rotates around the axis of the door hinge 10, and ω is set to 1 rad / s as required.

[0035] like Figure 1 As shown, assuming that the door as a whole rotates at a constant angular velocity ω around the axis of the door hinge 10, and in an ideal state, the influence of factors such as resistance is not considered, the moment of inertia I at this time can be measured by the processing software c ,according to

[0036] The rotational input energy E can be calculated, and under ideal conditions, the law of conservation of energy is followed.

[0037] In a preferred embodiment of the present invention, the lifting glass 3 includes a glass body and a glass bracket connected to the bottom of the glass body, and the glass bracket is slidably connected to the guide rail part 2. The method includes determining the rotation axis of the lifting glass 3 at the moment of closing and locking the door, setting the first fixed point o of the rotation axis on the line connecting the front lower corner point c and the rear upper corner point b of the lifting glass 3, the distance between the first fixed point o and the front lower corner point c is S1, and the distance between the first fixed point o and the rear upper corner point b is S2; measuring the distance S between the front lower corner point c and the rear upper corner point b; measuring the maximum displacement Y1 of the front lower corner point c moving along the left and right direction of the car due to vibration and the maximum displacement Y2 of the rear upper corner point b moving along the left and right direction of the car due to vibration; according to the similar triangle theorem And S=S1+S2, the values ​​of S1 and S2 are calculated, that is, the position of the first fixed point o is determined, and the line connecting the first fixed point o and the constraint center point e of the glass body is the rotation axis. The glass body is fixed to the glass bracket by two bolts 9, and the midpoint of the line connecting the two bolts 9 is the constraint center point e of the glass body.

[0038] like Figures 2 to 4 As shown, the corner point connecting line of the front lower corner point c and the rear upper corner point b of the lifting glass 3, assuming that the rotation axis at the moment of closing and locking the door is the new rotation axis, there is a first fixed point o on the new rotation axis, and this first fixed point o is also on the corner point connecting line, that is, the first fixed point o is the intersection of the new rotation axis and the corner point connecting line, preferably, when the glass body is fixed to the glass holder by two bolts 9, the guide rail part 2 constrains the glass holder, and then the movement distance of the glass holder is zero, that is, the constraint center point e of the glass body is the midpoint of the center connecting line of the two bolts 9, and the new rotation axis must pass through the midpoint, that is, the new rotation axis is line oe, and perpendicular lines of line oe are drawn through the front lower corner point c and the rear upper corner point b respectively, and the perpendicular feet are the first perpendicular foot d and the second perpendicular foot a respectively. At the moment when the door lock enters the fully locked state, the rear end of the lifting glass 3 rotates toward the inside of the car, Y1 is the distance from the glass to the inside of the sealing strip 8, and the front end of the lifting glass 3 rotates toward the outside of the car, Y2 is the distance from the glass to the outside of the sealing strip 8, and the influence of the lip of the sealing strip 8 is not considered. According to the similar triangle theorem, △oab∽△odc, we can get Right now By combining the line bc connecting the front lower corner point c and the rear upper corner point b, S can be directly measured. At the same time, S=S1+S2, and the values ​​of S1 and S2, that is, the lengths of oc and ob, can be solved, and the position of the first fixed point o and the position of the new rotation axis oe can be determined.

[0039] In a preferred embodiment of the present invention, according to the law of conservation of energy, the formula for calculating the angular velocity ω1 of the lifting glass 3 at the moment of door closing and locking is: Among them, I c is the moment of inertia of the lifting glass 3 when it rotates around the axis of the door hinge 10, ω is set to 1 rad / s as required, I c1 It is the moment of inertia of the lifting glass 3 at the moment of closing and locking the door.

[0040] like Figure 2 As shown in the figure, after the new rotation axis oe is determined, according to the law of conservation of energy, the ideal state without considering the influence of other factors is that the influence of other factors can be ignored. c and I c1 All are directly measured by UnigraphicsNX processing software, and then ω1 is directly calculated. Due to the change of the rotation axis, it shifts toward the side close to the door lock, making the moment of inertia I c1 Less than I c, so the angular velocity ω1 is greater than ω, and when the angular velocity ω1 increases to a certain value, the weld will crack.

[0041] In a preferred embodiment of the present invention, the formula for calculating the angular acceleration α of the front lower corner point c at the moment of door closing and locking is: Wherein, t is the duration of the door closing moment set to 0.01 seconds, and ω1 is the angular velocity of the lifting glass 3 at the moment of door closing and locking.

[0042] In fact, it is impossible to determine the deceleration method at the moment of closing the door, so it is assumed that the movement of the lifting glass 3 when closing the door is a uniform deceleration movement. The closing time is set to 0.01 seconds according to the actual vehicle test. Because the set angular velocity ω is smaller than that of the actual vehicle, ω1 is also smaller, and the acceleration α is also smaller, which does not affect the subsequent analysis. Of course, the setting of the acceleration α can also be directly set with reference to the actual vehicle measurement.

[0043] In a preferred embodiment of the present invention, the formula for calculating the force value F of the front lower corner point c is: c1 α=FL;where I c1 is the moment of inertia of the lifting glass 3 at the moment of closing and locking the door, α is the angular acceleration of the front lower corner point c, and L is the lever arm of the force F exerted on the front lower corner point c of the lifting glass 3.

[0044] like Figure 2 As shown, after determining the new rotation axis oe, draw a perpendicular line cd through the front lower corner point c to oe. According to the force analysis of the front lower corner point c, it can be known that the perpendicular line cd is the force arm L, which can be directly measured by UnigraphicsNX processing software. The angular acceleration α is directly obtained by calculation or empirical value. The moment of inertia I of the lifting glass 3 at the moment of closing and locking the door c1 Directly measured by UnigraphicsNX processing software, the force value F can be obtained by inserting it into the above formula, and then F and F max Compare, if F ≥ F max , then appropriate optimization is performed. The optimization method can refer to changing the cross-section of the sealing strip 8, thereby changing the ratio of Y1 and Y2, or changing the welding of the front guide channel bracket 5 and the door inner panel 1 to a bolted fixed connection to increase the connection strength between the front guide channel bracket 5 and the door inner panel 1.

[0045] In a preferred embodiment of the present invention, the measuring software is one of UnigraphicsNX, CATIA or Pro / ENGINEER processing software.

[0046] Among them, due to the irregular shape of the lifting glass 3, it is difficult to accurately measure the rotational inertia of the actual lifting glass. The rotational inertia of the lifting glass 3 can be measured by selecting the rotation axis using UnigraphicsNX, CATIA or Pro / ENGINEER software, which can reduce the analysis time of the rotational inertia. The present invention uses UnigraphicsNX to measure the rotational inertia.

[0047] The connection reliability analysis method of the door guide slot bracket of the present invention only needs fixed parameters to draw conclusions, and there is no need to build a CAE model to analyze and calculate the mechanical properties and optimize the structural performance, which improves the analysis efficiency and saves direct economic benefits of 300,000 yuan per year. Since the lifting glass 3 is irregular and uniform, in order to reduce the analysis time of the moment of inertia, UnigraphicsNX is used to measure the moment of inertia. Under the specified working conditions, the force analysis of the front guide slot bracket 5 is carried out, and combined with a large number of actual vehicle test results, the boundary F of the force value of the welding point of the front guide slot bracket 5 is obtained. max The subsequent vehicle model analysis is based on this force value F max As a boundary constraint input, ensure that the calculated force value F is less than the boundary force value F max , so that product design has a basis to rely on and improve the robustness of product design. The method of this application has been verified on a number of real vehicles, and the results are highly consistent with the actual test results, which greatly reduces the workload of virtual analysis in the early stage of design. The robustness of the doors optimized according to the model is significantly improved, and no cracking of the welds has occurred after the real vehicle test.

[0048] In the embodiments of the present invention, the term "plurality" refers to two or more than two, unless otherwise clearly defined. The terms "installation", "connection", "fixation" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0049] In the description of the embodiments of the present invention, it needs to be understood that the directions or positional relationships indicated by the terms "upper" and "lower" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the embodiments of the present invention.

[0050] In the description of this specification, the description of the terms "one embodiment", "a preferred embodiment", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0051] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for analyzing the connection reliability of a door guide channel bracket, characterized in that: The vehicle door comprises a vehicle door inner panel, a glass lifter, a lifting glass and a guide groove assembly, wherein the guide groove assembly comprises a front guide groove bracket, a front guide groove body and a sealing strip, wherein the front guide groove bracket is connected to the vehicle door inner panel, the front guide groove body is connected to the front guide groove bracket, the front guide groove body is elastically connected to the front side of the lifting glass through the sealing strip to support, buffer and guide the front side of the lifting glass, the driving part of the glass lifter is connected to the vehicle door inner panel, the lifting glass is slidably connected to the guide rail part of the glass lifter, so as to drive the lifting glass to rise and fall along the guide rail part by using the driving part, and the method comprises: The door is assumed to rotate around the axis of the door hinge at an angular velocity ω when the door is closed, and the moment of inertia I of the lifting glass when it rotates around the axis of the door hinge is measured. c ; Calculate the rotation input energy E of the lifting glass when it is at the bottom dead point; Determine the rotation axis of the lifting glass at the moment of door closing and locking, and measure the rotational inertia I of the lifting glass c1 ; Calculate the angular velocity ω1 of the lifting glass at the moment of door closing and locking; measure the force arm L of the front lower corner point of the lifting glass; Calculating the angular acceleration α of the front lower corner point; Calculate the force value F of the front lower corner point; The force value F and the maximum force value F that can be tolerated by fatigue endurance are compared. max Comparison, evaluating the reliability of the connection strength between the front guide channel bracket and the door inner panel; When F ≥ F max When F<F max When, end; The lifting glass comprises a glass body and a glass bracket connected to the bottom of the glass body, wherein the glass bracket is slidably connected to the guide rail portion, and the method comprises: When determining the rotation axis of the lift glass at the moment of door closing and locking, the first fixed point of the rotation axis is set on the line connecting the front lower corner point and the rear upper corner point of the lift glass, the distance between the first fixed point and the front lower corner point is S1, and the distance between the first fixed point and the rear upper corner point is S2; Measure the distance S between the front lower corner point and the rear upper corner point; Measure the maximum displacement Y1 of the front lower corner point due to vibration along the left and right direction of the car and the maximum displacement Y2 of the rear upper corner point due to vibration along the left and right direction of the car; According to the similar triangle theorem And S=S1+S2, the values ​​of S1 and S2 are calculated, that is, the position of the first fixed point is determined, and the line connecting the first fixed point and the constraint center point of the glass body is the rotation axis; The formula for calculating the angular velocity ω1 of the lifting glass at the moment of door closing and locking is: Among them, I c is the moment of inertia of the lifting glass when it rotates around the axis of the door hinge, ω is set to 1 rad / s as required, I c1 It is the moment of inertia of the lifting glass at the moment of door closing and locking.

2. The connection reliability analysis method of the door guide channel bracket according to claim 1, characterized in that: The glass body is fixedly connected to the glass bracket by two bolts, and the midpoint of the connection line of the two bolts is the constraint center point of the glass body.

3. The connection reliability analysis method of the door guide channel bracket according to claim 1, characterized in that: The formula for calculating the rotation input energy E of the lifting glass at the bottom dead center is: Among them, I c is the moment of inertia of the lifting glass when it rotates around the axis of the door hinge, and ω is set to 1 rad / s as required.

4. The connection reliability analysis method of the door guide channel bracket according to claim 1, characterized in that: The formula for calculating the angular acceleration α of the front lower corner point at the moment of door closing and locking is: Wherein, t is the duration of the door closing moment set to 0.01 seconds, and ω1 is the angular velocity of the lifting glass at the moment of door closing and locking.

5. The method for analyzing the connection reliability of a door guide channel bracket according to claim 1, characterized in that: The formula for calculating the force value F of the front lower corner point is: I c1 α=FL; Among them, I c1 is the moment of inertia of the lifting glass at the moment of door closing and locking, α is the angular acceleration of the front lower corner point, and L is the force arm of the force F exerted on the front lower corner point of the lifting glass.

6. The connection reliability analysis method of the door guide channel bracket according to claim 1, characterized in that: The measuring software is one of UnigraphicsNX, CATIA or Pro / ENGINEER processing software.

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