Blower body exciting force test equipment

Abstract

The utility model discloses air blower body exciting force testing equipment which comprises a base, a testing support is arranged on the base, the testing support is provided with a fixing disc used for installing an air blower, and the disc face of the fixing disc is parallel to the surface of the testing support. Three-way force sensors used for detecting exciting force generated by operation of the air blower are arranged between the fixing disc and the testing support and are evenly distributed in the circumferential direction of the air blower. According to the utility model, the internal load of the blower during rotation work is equivalent to the position of the blower mounting interface through the fixing disc and is measured through the three-way force sensor, so that powerful support can be provided for vibration noise analysis of the blower as an excitation source, and vibration noise analysis steps of the blower as the excitation source are simplified; and the whole vehicle disassembly and replacement test analysis is reduced, and the vibration noise analysis workload is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of NVH (noise, vibration and harshness) performance development of automobile air conditioners, and in particular to a blower body excitation force testing device. Background Art

[0002] Currently, the excitation force of blowers is primarily calculated using a rigid-body dynamics model, where the primary factor considered is the excitation generated by rotational inertia. The main drawback of this approach is that it requires precise parameters, some of which are difficult to accurately determine, such as centripetal acceleration. This inevitably leads to a certain deviation between the calculated results and actual engineering practice.

[0003] In actual engineering applications, in order to obtain the excitation force of a component, the matrix inversion method of the frequency response function is generally used. The matrix inversion of the frequency response function generally requires a transfer function and a response. The response generated by an automotive air-conditioning blower can be easily measured on the entire vehicle, but measuring the transfer function requires manually applying excitation at the center of mass of the blower, or obtaining the equivalent force at the center of mass of the blower in the working state. Both of these are impossible to achieve. Therefore, the matrix inversion method of the frequency response function cannot be applied to the excitation force measurement of the blower. Utility Model Content

[0004] Technical purpose: In view of the above-mentioned deficiencies in the existing blower excitation force measurement, the utility model discloses a blower body excitation force testing device that can equate the internal load of the blower during rotation to the position of the blower installation interface and measure it.

[0005] Technical solution: To achieve the above technical objectives, the present invention adopts the following technical solution:

[0006] A blower body excitation force testing device includes a base, a test bracket is arranged on the base, the test bracket is provided with a fixed plate for mounting the blower, the disk surface of the fixed plate is arranged parallel to the surface of the test bracket, and a three-axis force sensor for detecting the excitation force generated by the operation of the blower is arranged between the fixed plate and the test bracket, and the three-axis force sensors are evenly distributed along the circumferential direction of the blower.

[0007] Preferably, the blower of the present invention is connected to the fixed disk via a fixing fixture, and mounting points matching the fixing fixture are provided on the fixed disk, and the arrangement center of the mounting points is consistent with the arrangement center of the three-axis force sensor.

[0008] Preferably, an infrared speed meter for detecting the blower speed is provided on the test bracket of the present invention. The blower is installed behind the fixed disk with the fan blade end facing the infrared speed meter, and reflective paper cooperating with the infrared speed meter is provided on the fan blade.

[0009] Preferably, the test bracket of the present invention is provided with a right-angled brace on the side facing away from the fixing plate for supporting the test bracket and fixing it on the base.

[0010] Preferably, the base and the test bracket of the present invention are both made of steel, and the modal of the overall structure composed of the base, the test bracket and the right-angled brace is higher than the fundamental vibration frequency of the blower operation.

[0011] Preferably, a shock-absorbing pad is provided under the base of the utility model.

[0012] Beneficial effects: The blower body excitation force testing device disclosed in the utility model has the following beneficial effects:

[0013] 1. The utility model uses a fixed plate to make the internal load of the blower during rotation equivalent to the position of the blower installation interface and measures it through a three-axis force sensor. It can analyze and predict the vibration or noise contribution of the subsequent blower as an excitation source to the target position of the vehicle (such as the steering wheel or the driver's left and right ears), or combine it with other components (such as the air-conditioning box) for testing and simulation, providing strong support for the vibration and noise analysis of the blower as an excitation source, simplifying the vibration and noise analysis steps of the blower as an excitation source (reducing the need for vehicle disassembly and replacement testing and analysis), and reducing the workload of vibration and noise analysis.

[0014] 2. The utility model detects the excitation force generated by the blower at different speeds, which has higher accuracy than simulation calculations. The test results can be directly applied to the vibration noise analysis of the blower as the excitation source.

[0015] 3. The overall modal frequency of the test equipment of the present invention exceeds 100 Hz, which is greater than the fundamental vibration frequency of a conventional blower, thereby avoiding resonance between the test equipment and the blower and affecting the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art.

[0017] Figure 1 This is a three-dimensional diagram of the overall structure of the utility model;

[0018] Figure 2 This is the main view of the utility model;

[0019] Figure 3 This is a side view of the utility model;

[0020] Among them, 1-base, 2-test bracket, 3-blower, 4-fixed plate, 5-three-axis force sensor, 6-fixed tooling, 7-right-angle brace. DETAILED DESCRIPTION

[0021] Reference will now be made in detail to the embodiments of the present disclosure, one or more examples of which are set forth herein below. Each embodiment and example is provided by way of explanation of the apparatus, composition and materials of the present disclosure, and not by way of limitation. On the contrary, the following description provides a convenient illustration of exemplary embodiments for implementing the present disclosure. In fact, it will be clear to those skilled in the art that various modifications and variations can be made in the teachings of the present disclosure without departing from the scope or spirit of the present disclosure. For example, a feature shown or described as part of one embodiment may be used in conjunction with another embodiment to produce yet another embodiment. It is expected that the present disclosure covers such modifications and variations that fall within the scope of the appended claims and their equivalents. Other objects, features and aspects of the present disclosure are disclosed in or apparent from the following detailed description. It will be understood by those of ordinary skill in the art that this discussion is merely a description of exemplary embodiments and is not intended to limit the broader aspects of the present disclosure.

[0022] like Figure 1-Figure 3 As shown, the utility model discloses a blower body excitation force testing device, including a base 1, a test bracket 2 is arranged on the base 1, the test bracket 2 is provided with a fixed plate 4 for mounting the blower 3, the disk surface of the fixed plate 4 is arranged parallel to the surface of the test bracket 2, and a three-axis force sensor 5 for detecting the excitation force generated by the operation of the blower 3 is arranged between the fixed plate 4 and the test bracket 2, and the three-axis force sensors 5 are evenly distributed along the circumferential direction of the blower 3.

[0023] The utility model uses the fixed disk 4 to make the internal load during the operation of the blower equivalent to the position of the blower installation interface and then measures it through the three-axis force sensor 5, thereby simplifying the process of measuring the excitation force. A shock-absorbing pad can be set under the base 1 to reduce external vibration interference; at the same time, in order to improve the accuracy of the equivalent measurement, the blower 3 of the utility model is connected to the fixed disk 4 through the fixed tooling 6, and an installation point that cooperates with the fixed tooling 6 is set on the fixed disk 4. The arrangement center of the installation point is consistent with the arrangement center of the three-axis force sensor 5, so as to ensure that the equivalent force of the blower can act evenly on the fixed disk; the number of installation points is set according to the number of fixed points of a conventional blower in a car air-conditioning box, generally three, and the corresponding three-axis force sensor 5 is also set to 3, and corresponds to the installation point position in the radial direction of the fixed disk 4 to detect the excitation force at the corresponding installation point.

[0024] An infrared speed meter for detecting the rotational speed of the blower 3 is installed on the test bracket 2. The blower 3 is mounted on the fixed plate 4 with the fan blade end facing the infrared speed meter. Reflective paper is placed on the fan blade to match the infrared speed meter. 11. The infrared speed meter is aligned with the reflective paper on the fan blade to obtain the blower's operating speed. The excitation force is tested at different speeds, and data can be continuously collected to obtain excitation force data under various operating conditions.

[0025] At the same time, during the test of the present invention, when the excitation force of the blower is equivalent to the disc, it will generate a force on the test bracket and other structures. In order to ensure the accuracy of the measurement results of the three-axis force sensor 5, the test bracket 2 of the present invention is provided with a right-angled brace 7 on the side away from the fixed disk 4 for supporting the test bracket 2 and fixing it on the base 1. The base 1 and the test bracket 2 are both made of steel. The modal of the overall structure composed of the base 1, the test bracket 2 and the right-angled brace 7 is higher than the vibration fundamental frequency of the blower 3. Generally, the maximum operating speed of the blower is less than 6000rpm, that is, its operating vibration fundamental frequency is lower than 100Hz. Ensuring that the overall modal of the test equipment exceeds 100Hz can avoid the resonance between the equipment and the blower affecting the experimental results.

[0026] When the utility model is in use, the blower 3 is fixed on the fixed plate 4 of the test equipment to ensure that the test environment is free of abnormal vibration interference. The operating speed of the blower is controlled by controlling the voltage of the blower. In the embodiment of the utility model, the time is set to 8 minutes during the test. Before the experiment, the blower is powered on and run for 5-10 minutes to avoid abnormal conditions caused by motor startup. Then, when the test is started, the power supply voltage is evenly increased from the lowest operating speed to the highest operating speed within 8 minutes, and the speed is observed using an infrared speed meter; the three-axis force sensor detects the excitation force generated by the blower during the speed increase process, and the three installation points are respectively recorded as installation point 1. , mounting point 2 and mounting point 3; total excitation force ; F mx =F 1x +F 2x +F 3x ; F my =F 1y +F 2y +F 3y ; F mz =F 1z +F 2z +F 3z Among them, F 1x F is the force in the X direction on the mounting point 1; 1y F is the force in the Y direction on the mounting point 1; 1z F is the force in the Z direction on the mounting point 1; 2x F is the force in the X direction on the mounting point 2; 2y F is the force in the Y direction on the mounting point 2; 2z F is the force in the Z direction on the mounting point 2; 3x F is the force in the X direction on the mounting point 3; 3y F is the force in the Y direction on the mounting point 3; 3z F is the force in the Z direction on the mounting point 3;mx is the excitation force in the X direction, F my is the excitation force in the Y direction; F mz is the excitation force in the Z direction; F m is the total excitation force received by the bracket; the X direction, Y direction, and Z direction respectively represent the force directions detected by the three-axis force sensor, which are consistent with the detection coordinate system directions of the three-axis force sensor itself.

[0027] The data detected by the three-axis force sensor can be transmitted to the data acquisition software for storage, and the overall excitation force can be calculated to obtain the time domain excitation force signal data. The time domain excitation force data is then converted into frequency domain signal data through fast Fourier transform. The frequency domain signal data is the data required for the excitation force.

[0028] The test equipment provided by the present utility model can test the excitation force generated by the operation of the blower, and can analyze and predict the vibration or noise contribution of the blower as an excitation source to the target position of the vehicle (such as the steering wheel or the left and right ears of the driver) based on the test results.

Claims

1. A blower body excitation force testing device, characterized in that: The invention comprises a base (1), a test bracket (2) is arranged on the base (1), the test bracket (2) is provided with a fixed disk (4) for mounting a blower (3), the disk surface of the fixed disk (4) is arranged parallel to the surface of the test bracket (2), and a three-axis force sensor (5) for detecting the excitation force generated by the operation of the blower (3) is arranged between the fixed disk (4) and the test bracket (2), and the three-axis force sensors (5) are evenly distributed along the circumferential direction of the blower (3).

2. The blower body excitation force testing device according to claim 1, characterized in that: The blower (3) is connected to the fixed disk (4) via a fixed fixture (6), and mounting points matching the fixed fixture (6) are provided on the fixed disk (4), wherein the arrangement center of the mounting points is consistent with the arrangement center of the three-axis force sensor (5).

3. The blower body excitation force testing device according to claim 1, characterized in that: The test bracket (2) is provided with an infrared speed meter for detecting the rotation speed of the blower (3). The blower (3) is installed on the fixed plate (4) with the end where the fan blades are located facing the infrared speed meter. Reflective paper that cooperates with the infrared speed meter is provided on the fan blades.

4. The blower body excitation force testing device according to claim 1, characterized in that: The test bracket (2) is provided with a right-angled brace (7) on a side facing away from the fixing plate (4) for supporting the test bracket (2) and fixing it on the base (1).

5. The blower body excitation force testing device according to claim 4, characterized in that: The base (1) and the test bracket (2) are both made of steel, and the modal of the overall structure composed of the base (1), the test bracket (2) and the right-angled brace (7) is higher than the fundamental vibration frequency of the blower (3) during operation.

6. The blower body excitation force testing device according to claim 1, characterized in that: A shock-absorbing pad is provided below the base (1).

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