Method for reducing vibration noise of vehicle door glass lifting system by adopting anti-vibration pad

Abstract

The invention discloses a method for reducing vibration noise of a vehicle door glass lifting system through an anti-vibration pad. The method comprises the steps that the excitation frequency range f1-f2 generated by a lifting motor on a to-be-installed vehicle door is obtained; knocking a lifting motor mounted on the vehicle door in the Y direction to obtain a frequency response function amplitude curve without a damping pad; an anti-vibration pad is arranged between the lifting motor and the vehicle door; knocking a lifting motor mounted on the vehicle door in the Y direction to obtain a frequency response function amplitude curve after the anti-vibration pad is mounted; comparing the amplitude curve of the frequency response function after the anti-vibration pad is installed with the amplitude curve of the frequency response function without the anti-vibration pad, and marking an interval f1-f2 in the amplitude curve of the frequency response function; and judging whether the anti-vibration pad can be used for reducing the vibration noise of the vehicle door glass lifting system or not. The method has the advantages that whether the anti-vibration pad can be adopted to reduce the vibration noise of the vehicle door glass lifting system or not can be evaluated, simplicity and effectiveness are achieved, and the development period is short.

Description

Technical Field

[0001] The invention relates to the technical field of a vehicle door glass lifting system, and in particular to a method for reducing vibration noise of a vehicle door glass lifting system by using a vibration-damping pad. Background Art

[0002] The vibration and noise of the door glass lifting system is one of the common user problems. The technical development department of the automobile company needs to take measures to avoid this problem during the research and development stage of the vehicle model. The door system is one of the most complex systems on the vehicle body, and the door glass lifting system involves many parts. In the research and development stage of the vehicle model, the traditional measures to solve the vibration and noise problems of the door glass lifting system are mostly to optimize the sheet metal structure or the lifting motor. However, the optimization of the sheet metal structure or the lifting motor involves many measures, which are long and costly. Therefore, the automobile company may be forced to maintain the original design due to cost considerations, resulting in the quality of the listed automobile products being affected; or it may have to spend huge amounts of money and affect the vehicle model development cycle.

[0003] Therefore, automobile companies urgently need to adopt a simple, effective and low-cost method to reduce the vibration and noise of the door glass lifting system in vehicle model development, which will not increase costs too much and can ensure the vehicle model development cycle, and can improve the vibration and noise performance of the door glass lifting system, avoid user complaints after the model is launched on the market, and ensure the high quality of automobile products. Summary of the invention

[0004] In order to solve at least one of the above technical problems, the present invention provides a method for reducing the vibration noise of a vehicle door glass lifting system by using a vibration-damping pad. By comparing the frequency response function amplitude curves before and after the installation of the vibration-damping pad, it is determined whether the vibration-damping pad can be used to reduce the vibration noise of the vehicle door glass lifting system.

[0005] The present invention solves the technical problem by adopting the following technical solution:

[0006] A method for reducing the vibration noise of a door glass lifting system by using a vibration-damping pad comprises the following steps:

[0007] Step 100, obtaining an excitation frequency range f1-f2 generated by the lifting motor on the vehicle door to be installed;

[0008] Step 200, knocking the lifting motor installed on the car door in the Y direction to obtain a frequency response function amplitude curve without a vibration damping pad;

[0009] Step 300: Arrange a vibration damping pad between the lifting motor and the vehicle door;

[0010] Step 400, knocking the lifting motor installed on the car door in the Y direction to obtain the frequency response function amplitude curve after the vibration damping pad is installed;

[0011] Step 500: compare the frequency response function amplitude curve after the vibration damping pad is installed with the frequency response function amplitude curve without the vibration damping pad, and mark the f1-f2 interval in the frequency response function amplitude curve; determine whether the vibration damping pad can be used to reduce the vibration noise of the door glass lifting system.

[0012] Further, the method for determining whether the vibration-damping pad can be used to reduce the vibration noise of the door glass lifting system includes:

[0013] Step 501, obtaining the vibration acceleration amplitude peak value A0 of the frequency response function amplitude curve without the vibration damping pad in the range of f1-f2;

[0014] Step 502, obtaining the frequency f0 corresponding to the peak value A0 of the vibration acceleration amplitude;

[0015] Step 503, obtaining the vibration acceleration amplitude A1 of the frequency response function amplitude curve at the frequency f0 after the vibration damping pad is installed;

[0016] Step 504: compare the vibration acceleration amplitude A1 with the vibration acceleration amplitude peak A0. When the difference ΔA between A0 and A1 is ≥ A0*k0, it is determined that the vibration damping pad can effectively reduce the resonance noise of the door glass lifting system, wherein k0 is set to one of 5%-20%.

[0017] Furthermore, the method for obtaining the excitation frequency range f1-f2 generated by the lifting motor on the vehicle door to be installed includes:

[0018] Step 101, obtaining a characteristic curve of the lifting motor;

[0019] Step 102, measuring the resistance of the door system;

[0020] Step 103: According to the resistance of the door system, determine the lift motor speed range n1-n2 corresponding to the door system resistance in the lift motor characteristic curve, and determine the corresponding excitation frequency range f1-f2 generated by the lift motor on the door according to the speed range n1-n2.

[0021] Further, the frequency f is calculated according to the following formula: f = n / 60*i;

[0022] Among them, f is the frequency, Hz; n is the speed, r / min; i is the transmission ratio between the lifting motor rotor shaft and the turbine output shaft.

[0023] Furthermore, the method of providing a vibration damping pad between the lifting motor and the vehicle door includes:

[0024] Step 301, determining the location of the vibration-damping pad, the vibration-damping pad being arranged on the stator housing of the lifting motor, or being arranged on the vehicle door corresponding to the stator housing of the lifting motor;

[0025] Step 302: Determine the area of the vibration damping pad. The area of the vibration damping pad is not less than 1 / 2 of the area of the stator housing of the lifting motor on the side in contact with the vibration damping pad.

[0026] Step 303: Determine the thickness, density, and material of the vibration damping pad. The thickness D of the vibration damping pad in the free state is set to be 1.05 - 1.45 times the width L0 of the installation gap between the lifting motor and the vehicle door; the density of the vibration damping pad is set to be 75 - 200 kg / m 3 。

[0027] Furthermore, the method for determining the thickness, density, and material of the vibration damping pad includes:

[0028] Step 3031: Measure the amplitude of the frequency response function of vibration damping pads of different materials with the same thickness D0 and the same density ρ0 respectively. Compare the amplitude curves of the frequency response functions of the vibration damping pads of each material with the amplitude curve of the frequency response function without a vibration damping pad, and select the vibration damping pad with a material where the difference ΔA ≥ A0 * k0 as the vibration damping pad for this vehicle door; if ΔA < A0 * k0 for the vibration damping pads of each material, continue with the following steps. Among them, the thickness D0 of the vibration damping pad is set to be 1.05 times the width L0 of the installation gap between the lifting motor and the vehicle door, and the density ρ0 of the vibration damping pad is set to be 75 kg / m 3 ;

[0029] Step 3032: Select the vibration damping pad of the first material with the largest difference ΔA, and further adjust the thickness of the vibration damping pad.

[0030] Step 3033: Gradually increase the thickness of the vibration damping pad by ΔL from D0, and measure its amplitude of the frequency response function until the thickness of the vibration damping pad increases to 1.45 times the width L0 of the installation gap between the lifting motor and the vehicle door. Among them, ΔL is set to be one of 0.5 - 2 mm; if when the thickness of the vibration damping pad gradually increases to Di, compare it with the amplitude curve of the frequency response function without a vibration damping pad, and if ΔA ≥ A0 * k0, then use the vibration damping pad with the thickness of Di; if ΔA < A0 * k0 for the vibration damping pads of each thickness, continue with the following steps, where 1.05L0 < Di ≤ 1.45L0;

[0031] Step 3034: Select the thickness of the vibration damping pad with the largest difference ΔA as the thickness of the vibration damping pad, and further adjust the density of the vibration damping pad.

[0032] Step 3035: Gradually increase the density of the vibration damping pad by Δρ from ρ0, and measure its amplitude of the frequency response function until the density of the vibration damping pad increases to 200 kg / m 3 ,where Δρ is set to be 25 - 50 kg / m 3One of them; if the density of the damping pad gradually increases to ρi and is compared with the amplitude curve of the frequency response function without the damping pad, and ΔA≥A0*k0, then the damping pad with density ρi is adopted; if ΔA<A0*k0 for the damping pads of each density, it is determined that the damping pad cannot be used to reduce the vibration and noise of the door glass lifting system. Among them, 75 kg / m 3 <ρi≤200 kg / m 3 .

[0033] Furthermore, the material of the damping pad is PE, EVA, EPDM, rubber, PU, foam or sponge.

[0034] Furthermore, the damping pad is fixed to the lifting motor and / or the door by bonding.

[0035] Furthermore, the damping pad is arranged between the lifting motor and the window lifter or between the lifting motor and the door sheet metal.

[0036] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0037] (1) This method can evaluate whether a damping pad can be used to reduce the vibration and noise of the door glass lifting system, can effectively improve the vibration and noise performance of the door glass lifting system, avoid user complaints after the vehicle model is launched, and ensure the high quality of automotive products; and it is simple and effective, with low cost, neither increasing the cost too much nor affecting the vehicle model development cycle.

[0038] (2) By setting damping pads with appropriate thickness, density and material, this method can obtain a damping pad solution with better damping effect, is easy to operate, requires fewer test verifications, and saves the development cycle. Description of the Drawings

[0039] To better understand the above and other objects, features, advantages and functions of the present invention, reference can be made to the embodiments shown in the drawings. The same reference numerals in the drawings refer to the same components. Those skilled in the art should understand that the drawings are intended to schematically illustrate the preferred embodiments of the present invention and have no restrictive effect on the scope of the present invention. The components in the drawings are not drawn to scale.

[0040] Figure 1 It is a flowchart of the method for using a damping pad to reduce the vibration and noise of the door glass lifting system of the present invention.

[0041] Figure 2 It is a schematic diagram for comparing the amplitude curves of the frequency response function before and after using the damping pad of the present invention.

[0042] Figure 3 It is a schematic diagram of the motor characteristic curve of the present invention.

[0043] Figure 4 This is a comparison chart of the vibration and noise reduction effects of vibration damping pads made of different materials.

[0044] Figure 5 This is a comparison chart of the vibration and noise reduction effects of vibration-damping pads of different thicknesses.

[0045] Figure 6 This is a comparison chart of the vibration and noise reduction effects of vibration-damping pads of different densities.

[0046] Figure 7 Flow chart for determining the thickness, density and material of the vibration damping pad. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the exemplary embodiments of the present invention are described below in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for the sake of clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0048] In the description of the present invention, it should be noted that the term "including" and its variations represent open inclusion, that is, "including but not limited to". The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "and / or" when used to list two or more items means that any one of the listed items can be used, or any combination of two or more of the listed items can be used. In addition, in the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0049] The present invention provides a method for reducing the vibration noise of a door glass lifting system by using a vibration-damping pad, such as Figure 1 As shown, the following steps are included:

[0050] Step 100, obtaining an excitation frequency range f1-f2 generated by the lifting motor on the vehicle door to be installed;

[0051] Step 200, knocking the lifting motor installed on the car door in the Y direction to obtain a frequency response function amplitude curve without a vibration damping pad;

[0052] Step 300: Arrange a vibration damping pad between the lifting motor and the vehicle door;

[0053] Step 400, knocking the lifting motor installed on the car door in the Y direction to obtain the frequency response function amplitude curve after the vibration damping pad is installed;

[0054] Step 500: compare the frequency response function amplitude curve after the vibration damping pad is installed with the frequency response function amplitude curve without the vibration damping pad, and mark the f1-f2 interval in the frequency response function amplitude curve; determine whether the vibration damping pad can be used to reduce the vibration noise of the door glass lifting system.

[0055] The lifting motor installed on the door can be hit with a hammer and the impact force can be collected. At the same time, the vibration acceleration of the motor can be measured using an accelerometer to obtain the frequency response function amplitude curve, which can reflect the modal frequency of the door lifting system and the system response under different frequency excitations, that is, the system's sensitivity to different frequency excitations. For mass-produced products, the lifting system modal frequency is within a certain range, and the motor excitation frequency f1-f2 is also within a certain range f1′-f2′. It can be understood that the Y direction is the width direction of the vehicle.

[0056] refer to Figure 1 and Figure 2 As shown, the method for determining whether the vibration-damping pad can be used to reduce the vibration noise of the door glass lifting system includes:

[0057] Step 501, obtaining the vibration acceleration amplitude peak value A0 of the frequency response function amplitude curve without the vibration damping pad in the range of f1-f2;

[0058] Step 502, obtaining the frequency f0 corresponding to the peak value A0 of the vibration acceleration amplitude;

[0059] Step 503, obtaining the vibration acceleration amplitude A1 of the frequency response function amplitude curve at the frequency f0 after the vibration damping pad is installed;

[0060] Step 504: compare the vibration acceleration amplitude A1 with the vibration acceleration amplitude peak A0. When the difference ΔA between A0 and A1 is ≥ A0*k0, it is determined that the vibration damping pad can effectively reduce the resonance noise of the door glass lifting system, wherein k0 is set to one of 5%-20%.

[0061] refer to Figure 2As shown in FIG. 1 , when the difference ΔA between A0 and A1 is ≥ A0*k0, the vibration acceleration amplitude of the frequency response function amplitude curve after the vibration damping pad is installed at the frequency f0 decreases by at least k0. k0 is set to one of 5%-20%, for example, k0 can be set to 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19% or 20%, etc. It indicates that the frequency f′ corresponding to the modal peak of the frequency response function amplitude curve after the vibration damping pad is installed is shifted to the right and moves out of the f1-f2 interval. At this time, the resonance risk is eliminated, and the installation of the vibration damping pad can effectively reduce the vibration noise of the door glass lifting system; or it indicates that the frequency f′ corresponding to the modal peak of the frequency response function amplitude curve after the vibration damping pad is installed is still within the f1-f2 interval, but the modal peak of the frequency response function amplitude curve after the vibration damping pad is installed is reduced. At this time, although resonance exists, the resonance response is reduced, and the installation of the vibration damping pad can effectively reduce the vibration noise of the door glass lifting system; or it indicates that the frequency f′ moves out of the f1-f2 interval and the modal peak is reduced. At this time, the resonance risk is eliminated and the vibration response is reduced. After the vibration damping pad is installed, the effect of reducing the vibration noise of the door glass lifting system is better.

[0062] refer to Figure 3 As shown, the method for obtaining the excitation frequency range f1-f2 generated by the lifting motor on the vehicle door to be installed includes:

[0063] Step 101, obtaining a characteristic curve of the lifting motor;

[0064] Step 102, measuring the resistance of the door system;

[0065] Step 103: According to the resistance of the door system, determine the lift motor speed range n1-n2 corresponding to the door system resistance in the lift motor characteristic curve, and determine the corresponding excitation frequency range f1-f2 generated by the lift motor on the door according to the speed range n1-n2.

[0066] When the glass is raised or lowered, the lifting motor needs to do work to overcome the resistance of the door system. The resistance of the door system is the lifting torque of the door system, which can be measured by removing the lifting motor from the vehicle door. Figure 3The motor speed range n1-n2 corresponding to the lifting torque of the door system is determined in the motor characteristic curve diagram. According to the speed range n1-n2, f1 and f2 can be calculated respectively, that is, the corresponding excitation frequency range f1-f2 generated by the lifting motor on the door is determined. Specifically, the frequency f can be calculated according to the following formula: f=n / 60*i; where f is the frequency, Hz; n is the speed, r / min; i is the transmission ratio between the rotor shaft of the lifting motor and the turbine output shaft. For example, when the transmission ratio i between the rotor shaft of the lifting motor and the turbine output shaft is 70 and the speed n is 100r / min, the frequency f can be calculated to be 117Hz.

[0067] Specifically, the method of arranging a vibration damping pad between the lifting motor and the vehicle door includes:

[0068] Step 301, determining the location of the vibration-damping pad, the vibration-damping pad is arranged on the stator housing of the lifting motor, or on the door corresponding to the stator housing of the lifting motor; preferably, the vibration-damping pad is arranged in the middle of the stator housing of the lifting motor, and if the arrangement is difficult, it can be offset to the top or bottom of the stator housing;

[0069] Step 302, determine the area of ​​the vibration damping pad, which is not less than 1 / 2 of the area of ​​the stator housing of the lifting motor on the side in contact with the vibration damping pad; the shape of the vibration damping pad can be consistent with the mounting surface, or can be set to a regular shape such as a rectangle or a circle;

[0070] Step 303: Determine the thickness, density and material of the vibration damping pad. The thickness D of the vibration damping pad in the free state is set to 1.05-1.45 times the installation gap width L0 between the lifting motor and the door; the density of the vibration damping pad is set to 75-200kg / m 3 For example, the thickness D of the vibration damping pad in the free state can be set to 1.05 times, 1.1 times, 1.15 times, 1.2 times, 1.25 times, 1.3 times, 1.35 times, 1.4 times or 1.45 times the installation gap width L0 between the lifting motor and the door; the density of the vibration damping pad can be set to 75kg / m 3 , 100kg / m 3 , 125kg / m 3 、150kg / m 3 、175kg / m 3 Or 200kg / m 3 wait.

[0071] The clearance width between the lifting motor and the vehicle door can be measured in the vehicle door digital model. According to the structural form of the lifting system, the damping pad is arranged between the lifting motor and the window lifter or between the lifting motor and the vehicle door sheet metal. The clearance between the lifting motor and the vehicle door is the clearance between the lifting motor and the window lifter, or the clearance between the lifting motor and the vehicle door sheet metal. The clearance width between the lifting motor and the window lifter or the vehicle door sheet metal can be measured in the vehicle door digital model, and the thickness of the damping pad in the free state is increased by 5%-45%, that is, the compression amount of the damping pad is set to 5%-45%.

[0072] The material, thickness and density of the damping pad can be determined according to requirements such as damping effect, environmental protection and health. The damping pad can be made of materials with damping effect and non-toxic environmental protection, such as PE, EVA, EPDM, rubber, PU, foam, sponge and other materials. Preferably, the material of the damping pad is PE or EVA. As Figure 4 shown, it is a comparison chart of the amplitude curves of the frequency response functions of damping pads of different materials. As Figure 5 shown, it is the test measurement comparison result of the damping and noise reduction effects of damping pads of different thicknesses on the vehicle, which can be obtained by measuring with a sound level meter beside the occupant's ear on the vehicle. As Figure 6 shown, it is a comparison chart of the amplitude curves of the frequency response functions of damping pads of different densities. It can be seen from Figure 4-Figure 6 that damping pads of different materials, different thicknesses and different densities have different noise reduction effects. In order to achieve good noise reduction effects, damping pads of appropriate materials, appropriate thicknesses and appropriate densities need to be selected for specific vehicle models.

[0073] Specifically, as Figure 7 shown, the methods for determining the thickness, density and material of the damping pad include:

[0074] Step 3031: Measure the amplitude of the frequency response function of damping pads of different materials with the same thickness D0 and the same density ρ0 respectively. Compare the amplitude curves of the frequency response functions of each material damping pad with the amplitude curve of the frequency response function without a damping pad, and select the damping pad with a material where the difference ΔA≥A0*k0 as the damping pad for this vehicle door; if the ΔA of each material damping pad is <A0*k0, continue to execute the following steps, where the thickness D0 of the damping pad is set to 1.05 times the installation clearance width L0 between the lifting motor and the vehicle door, and the density ρ0 of the damping pad is set to 75 kg / m 3 ;

[0075] Step 3032: Select the first material damping pad with the largest difference ΔA and further adjust the thickness of the damping pad.

[0076] Step 3033: Gradually increase the thickness of the vibration damping pad by ΔL from D0, and measure the amplitude of its frequency response function until the thickness of the vibration damping pad increases to 1.45 times the installation clearance width L0 between the lifting motor and the vehicle door, where ΔL is set to be one of 0.5 - 2 mm; if when the thickness of the vibration damping pad gradually increases to Di, compare it with the frequency response function amplitude curve without the vibration damping pad, and if ΔA ≥ A0 * k0, then use the vibration damping pad with thickness Di; if for vibration damping pads of each thickness, ΔA < A0 * k0, continue to execute the following steps, where 1.05L0 < Di ≤ 1.45L0;

[0077] Step 3034: Select the thickness of the vibration damping pad with the largest difference ΔA as the thickness of the vibration damping pad, and further adjust the density of the vibration damping pad;

[0078] Step 3035: Gradually increase the density of the vibration damping pad by Δρ from ρ0, and measure the amplitude of its frequency response function until the density of the vibration damping pad increases to 200 kg / m 3 , where Δρ is set to be one of 25 - 50 kg / m 3 ; if when the density of the vibration damping pad gradually increases to ρi, compare it with the frequency response function amplitude curve without the vibration damping pad, and if ΔA ≥ A0 * k0, then use the vibration damping pad with density ρi; if for vibration damping pads of each density, ΔA < A0 * k0, then it is determined that the vehicle door cannot use a vibration damping pad to reduce the vibration and noise of the vehicle door glass lifting system, where 75 kg / m 3 <ρi ≤ 200 kg / m 3 .

[0079] Step 3031 can determine the material of the vibration damping pad with better damping effect. If there are multiple vibration damping pads with ΔA ≥ A0 * k0 among multiple candidate materials, then the vibration damping pad of a suitable material can be selected according to requirements such as cost and durability as the vibration damping pad for the vehicle door, or the vibration damping pad with the largest ΔA among the vibration damping pads of multiple materials with ΔA ≥ A0 * k0 can be selected as the vibration damping pad for the vehicle door.

[0080] When the vibration damping pads of different materials with a thickness of D0 and a density of ρ0 satisfy ΔA < A0 * k0, select the vibration damping pad of the first material with the largest difference ΔA. For example, for the door of a certain vehicle model, an EVA material vibration damping pad can be selected, and then the vibration damping and noise reduction effect can be improved by adjusting the thickness of the vibration damping pad. In step 3033, the thickness of the vibration damping pad gradually increases by ΔL from D0, and ΔL is set to one of 0.5 - 2 mm. For example, ΔL can be set to 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, or 2 mm, etc. When the thickness of the vibration damping pad increases to Di (Di = D0 + i * ΔL, where i = 1, 2,..., n) and ΔA ≥ A0 * k0, use the vibration damping pad with a thickness of Di. Previously, when the thickness D of the vibration damping pad < Di, ΔA < A0 * k0. When the thickness D(n - 1) of the vibration damping pad < 1.45L0 and Dn > 1.45L0, set Dn to 1.45L0.

[0081] When the vibration damping pad of the first material with a thickness gradually increasing to 1.45L0 still has ΔA < A0 * k0, select the thickness of the vibration damping pad with the largest difference ΔA as the thickness of the vibration damping pad, and then improve the vibration damping and noise reduction effect by adjusting the density of the vibration damping pad. In step 3035, the density of the vibration damping pad gradually increases by Δρ from ρ0, and Δρ is set to one of 25 - 50 kg / m 3 For example, Δρ can be set to 25 kg / m 3 、30 kg / m 3 、35 kg / m 3 、40 kg / m 3 、45 kg / m 3 or 50 kg / m 3 etc. When the density of the vibration damping pad increases to ρi (ρi = ρ0 + i * Δρ, where i = 1, 2,..., n) and ΔA ≥ A0 * k0, use the vibration damping pad with a density of ρi. Previously, when the density ρ of the vibration damping pad < ρi, ΔA < A0 * k0. When the density ρ(n - 1) of the vibration damping pad < 200 kg / m 3 and ρn > 200 kg / m 3 set ρn to 200 kg / m 3 . When the density increases to 200 kg / m 3 and the vibration damping pad still has ΔA < A0 * k0, it is determined that the door cannot use a vibration damping pad to reduce the vibration and noise of the door glass lifting system, and other methods need to be used to improve the vibration and noise problem of the door glass lifting system.

[0082] In one embodiment, the vibration damping pad is fixed to the lifting motor and / or the vehicle door by bonding. The vibration damping pad can be glued on one side and fixed to the lifting motor housing, or to the window lifter, or to the door sheet metal. The vibration damping pad can also be glued on both sides and fixed by bonding at the same time.

[0083] The verification process of determining the thickness, density and material of the vibration damping pad by this method is simple and has a short cycle. It can quickly determine a vibration damping pad solution with better vibration damping effect, and can evaluate whether the vibration damping pad can be used to reduce the vibration noise of the door glass lifting system. It can effectively improve the vibration and noise performance of the door glass lifting system, avoid user complaints after the vehicle model is launched on the market, and ensure the high quality of automobile products. It is simple, effective and low-cost, and does not increase the cost too much while ensuring the vehicle model development cycle. It can be quickly designed and produced as needed, and can be quickly verified and used even in the middle and late stages of vehicle model development.

[0084] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, 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 reducing the vibration noise of a door glass lifting system by using a vibration-damping pad, characterized in that: The following steps are involved: Step 100, obtaining an excitation frequency range f1-f2 generated by the lifting motor on the vehicle door to be installed; Step 200, knocking the lifting motor installed on the car door in the Y direction to obtain a frequency response function amplitude curve without a vibration damping pad; Step 300: Arrange a vibration damping pad between the lifting motor and the vehicle door; Step 400, knocking the lifting motor installed on the car door in the Y direction to obtain the frequency response function amplitude curve after the vibration damping pad is installed; Step 500: compare the frequency response function amplitude curve after the vibration damping pad is installed with the frequency response function amplitude curve without the vibration damping pad, and mark the f1-f2 interval in the frequency response function amplitude curve; determine whether the vibration damping pad can be used to reduce the vibration noise of the door glass lifting system.

2. The method according to claim 1, characterized in that Methods for determining whether the vibration-damping pad can be used to reduce the vibration noise of the door glass lifting system include: Step 501, obtaining the vibration acceleration amplitude peak value A0 of the frequency response function amplitude curve without the vibration damping pad in the range of f1-f2; Step 502, obtaining the frequency f0 corresponding to the peak value A0 of the vibration acceleration amplitude; Step 503, obtaining the vibration acceleration amplitude A1 of the frequency response function amplitude curve at the frequency f0 after the vibration damping pad is installed; Step 504: compare the vibration acceleration amplitude A1 with the vibration acceleration amplitude peak A0. When the difference ΔA between A0 and A1 is ≥ A0*k0, it is determined that the vibration damping pad can effectively reduce the resonance noise of the door glass lifting system, wherein k0 is set to one of 5%-20%.

3. The method according to claim 1, characterized in that The method for obtaining the excitation frequency range f1-f2 generated by the lifting motor on the vehicle door to be installed includes: Step 101, obtaining a characteristic curve of the lifting motor; Step 102, measuring the resistance of the door system; Step 103: According to the resistance of the door system, determine the lift motor speed range n1-n2 corresponding to the door system resistance in the lift motor characteristic curve, and determine the corresponding excitation frequency range f1-f2 generated by the lift motor on the door according to the speed range n1-n2.

4. The method according to claim 3, characterized in that The frequency f is calculated according to the following formula: f = n / 60*i; Among them, f is the frequency, Hz; n is the speed, r / min; i is the transmission ratio between the lifting motor rotor shaft and the turbine output shaft.

5. The method according to claim 1, characterized in that The method of arranging a vibration damping pad between a lifting motor and a vehicle door comprises: Step 301, determining the location of the vibration-damping pad, the vibration-damping pad being arranged on the stator housing of the lifting motor, or being arranged on the vehicle door corresponding to the stator housing of the lifting motor; Step 302, determining the area of ​​the vibration damping pad, the area of ​​the vibration damping pad being not less than 1 / 2 of the area of ​​the stator housing of the lifting motor on the side in contact with the vibration damping pad; Step 303: Determine the thickness, density and material of the vibration damping pad. The thickness D of the vibration damping pad in the free state is set to 1.05-1.45 times the installation gap width L0 between the lifting motor and the door; the density of the vibration damping pad is set to 75-200kg / m 3 .

6. The method according to claim 5, characterized in that Methods for determining the thickness, density and material of the vibration damping pad include: Step 3031: Measure the amplitude of the frequency response function of vibration damping pads made of different materials with a thickness of D0 and a density of ρ0 respectively. Compare the amplitude curves of the frequency response function of each material's vibration damping pad with the amplitude curve of the frequency response function without a vibration damping pad, and select the vibration damping pad made of a material with a difference ΔA ≥ A0 * k0 as the vibration damping pad for this car door; if ΔA < A0 * k0 for the vibration damping pads of each material, continue to perform the following steps. Among them, the thickness D0 of the vibration damping pad is set to 1.05 times the installation clearance width L0 between the lifting motor and the car door, and the density ρ0 of the vibration damping pad is set to 75 kg / m 3 ; Step 3032, selecting the first material vibration damping pad with the largest difference ΔA, and further adjusting the thickness of the vibration damping pad; Step 3033: Gradually increase the thickness of the vibration damping pad by ΔL from D0, and measure the amplitude of its frequency response function until the thickness of the vibration damping pad increases to 1.45 times the width L0 of the installation gap between the lifting motor and the door, where ΔL is set to be one of 0.5 - 2 mm; if when the thickness of the vibration damping pad gradually increases to Di, compare it with the frequency response function amplitude curve without the vibration damping pad, and if ΔA≥A0*k0, then use the vibration damping pad with thickness Di; if ΔA < A0*k0 for vibration damping pads of each thickness, continue to perform the following steps, where 1.05L0<Di≤1.45L0; Step 3034: Select the thickness of the vibration damping pad with the largest difference ΔA as the thickness of the vibration damping pad, and further adjust the density of the vibration damping pad; Step 3035: Gradually increase the density of the vibration damping pad by Δρ from ρ0, and measure the amplitude of its frequency response function until the density of the vibration damping pad increases to 200 kg / m 3 , where Δρ is set to be one of 25 - 50 kg / m 3 ; If when the density of the vibration damping pad gradually increases to ρi, compare it with the frequency response function amplitude curve without the vibration damping pad. If ΔA ≥ A0 * k0, then use the vibration damping pad with density ρi; If ΔA < A0 * k0 for the vibration damping pads of each density, then it is determined that the door cannot use the vibration damping pad to reduce the vibration and noise of the door glass lifting system, where 75 kg / m 3 <ρi ≤ 200 kg / m 3 .

7. The method according to claim 5 or 6, characterized in that: The material of the vibration damping pad is PE, EVA, EPDM, rubber, PU, foam or sponge.

8. The method according to claim 1, characterized in that The vibration damping pad is fixed to the lifting motor and / or the door by adhesion.

9. The method according to claim 1, characterized in that: The vibration damping pad is arranged between the lifting motor and the window lifter or between the lifting motor and the door sheet metal.

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