Passenger car air outlet diaphragm closing sound measuring method
The closed sound of passenger vehicle exhaust diaphragm is measured through acoustic data acquisition and vibration test system, which solves the problem of insufficient sound evaluation in the prior art, and realizes accurate testing and fault diagnosis of the closed sound of exhaust diaphragm. Optimized design and reduced user complaints.
Patent Information
- Application Number
- CN202411363058.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-01-07
AI Technical Summary
The prior art lacks methods to accurately evaluate and diagnose the magnitude of the closed sound of the passenger vehicle exhaust diaphragm, causing users to complain that the sound is too loud and lack of optimization methods.
The acoustic data acquisition system and vibration testing system are used to evaluate the magnitude of the closed sound of the exhaust diaphragm and identify the design by detecting background noise, installing test fixtures and microphones, applying sinusoidal excitation, measuring and calculating sound pressure levels and loudness. question.
It realizes accurate testing of the diaphragm closing sound of the exhaust vent during the automobile development stage, which facilitates diagnosis and design optimization of the troubleshooting vents and meets performance requirements.
Smart Images
Figure CN119268834A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of automobiles, and in particular relates to a method for measuring closing sound of a diaphragm of an exhaust vent of a passenger car. Background Art
[0002] The exhaust vent is an important part of the car, usually symmetrically distributed on both sides of the rear of the car body, and is an important controllable channel for air circulation inside and outside the car. When the pressure inside the car is greater than the pressure outside the car, the diaphragm on the exhaust vent opens outwards, and the air inside the car is exchanged with the air outside the car.
[0003] However, since the exhaust vent diaphragm is mostly made of rubber, the diaphragm will collide with the shell and produce a closing sound when closing. The thickness and material of the diaphragm have a great influence on the closing sound of the exhaust vent diaphragm.
[0004] Usually, this closing sound is produced when the door is closed or driving, and the loud sound will cause user complaints. Currently, there is a lack of corresponding methods to evaluate the closing sound of the exhaust vent diaphragm, so as to achieve the diagnosis and optimization of faulty exhaust vents and the positive development of exhaust vents. Summary of the invention
[0005] The purpose of the present invention is to provide a method for measuring the closing sound of the diaphragm of the exhaust vent of a passenger car, so as to solve the problem of conveniently and accurately testing the size of the closing sound of the diaphragm of the exhaust vent.
[0006] The objective of the present invention is achieved through the following technical solutions:
[0007] A method for measuring the closing sound of a diaphragm of an exhaust vent of a passenger car comprises the following steps:
[0008] A. Turn on the acoustic data acquisition system and vibration test system, and install the exhaust vent sample;
[0009] B. Measurement of closing sound of diaphragm of passenger car exhaust vent:
[0010] B1. Detect background noise: When only the fixture is installed and there is no test piece, check whether the background noise of the test site meets the test requirements;
[0011] B2. Install the test fixture 3;
[0012] B3. Install the exhaust port 4 on the test fixture 3 so that the opening and closing directions of the diaphragm are consistent with the horizontal excitation direction of the vibration table 2.
[0013] B4. Perform excitation debugging on vibration table 2;
[0014] B5. Arrange the microphone 5 and adjust the position of the microphone 5 to arrange it at a designated position in the normal direction of the exhaust port, with the microphone 5 pointing to the geometric center of the exhaust port 4;
[0015] B6. Noise measurement: Apply sinusoidal excitation to the vibration table 2 in the horizontal direction to measure the noise generated by the closing of the exhaust diaphragm. After the measurement time is determined for each measurement, multiple measurements need to be performed;
[0016] B7. Sound pressure level calculation: Take the arithmetic average of the sound pressure levels measured multiple times;
[0017] B8. Loudness calculation: Take the arithmetic average of the loudness measured multiple times;
[0018] B9. Based on the size of the closing sound of the exhaust vent diaphragm, evaluate whether the design of the exhaust vent diaphragm meets the performance requirements.
[0019] Further, in step B1, it is checked whether the background noise of the test site does not exceed 40dB(A).
[0020] Further, in step B2, the test fixture 3 is installed at the center position of the vibration table 2; the vibration table 2 is installed on the vibration table base 1.
[0021] Further, in step B3, the air outlet 4 is installed on the test fixture 3 according to the actual use state.
[0022] Furthermore, in step B4, sinusoidal excitations of different amplitudes and frequencies are applied to the vibration table 2, so that the closing sounds produced by the faulty exhaust vent and the normal exhaust vent are significantly different.
[0023] Furthermore, in step B4, a sinusoidal excitation with a suitable amplitude and frequency is summarized according to the test data.
[0024] Further, in step B5, the microphone 5 is mounted on the microphone holder 6, and the microphone holder 6 is placed on the ground.
[0025] Furthermore, in step B5, the position of the microphone 5 is adjusted to be arranged 15 cm in front of the air outlet in the normal direction.
[0026] Further, in step B6, each measurement time is 30 seconds, and 3 measurements are required.
[0027] Further, in step B9, the cause of the abnormal closing sound of the exhaust vent diaphragm is identified according to the test sound pressure level and loudness, or it is determined whether the closing sound of the exhaust vent diaphragm meets the design requirements.
[0028] Compared with the prior art, the present invention has the following beneficial effects:
[0029] The passenger car exhaust vent diaphragm closing sound measurement method of the present invention can conveniently and accurately test the size of the exhaust vent diaphragm closing sound during the automobile development stage, and is used to evaluate whether the design of the exhaust vent diaphragm meets the performance requirements; and can perform problem diagnosis and design optimization on faulty exhaust vents. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.
[0031] Figure 1 Schematic diagram of the installation of the exhaust vent sample;
[0032] Figure 2 Flowchart of the steps in the passenger car exhaust vent diaphragm closing sound measurement method. DETAILED DESCRIPTION
[0033] The present invention will be further described below in conjunction with embodiments:
[0034] The method for measuring the closing sound of the diaphragm of the passenger car exhaust vent of the present invention comprises the following steps:
[0035] 1. Test preparation: Turn on the acoustic data acquisition system and the vibration test system, and pass the exhaust vent sample through the following Figure 1 Install as shown.
[0036] 2. Measurement:
[0037] Step 1: Detect background noise. When only the fixture is installed and there is no test piece, check whether the background noise of the test site meets the test requirements.
[0038] Step 2: Installation of the test fixture 3 : The test fixture 3 is installed at the center of the vibration table 2 ; the vibration table 2 is installed on the vibration table base 1 .
[0039] Step 3: Installation of the air outlet 4. The air outlet 4 is installed on the test fixture 3 according to the actual use state, so that the opening and closing directions of the diaphragm are consistent with the horizontal excitation direction of the vibration table 2.
[0040] Step 4: Excitation debugging: Apply sinusoidal excitations of different amplitudes and frequencies to the vibration table 2 to make the closing sounds of the faulty exhaust vents and the normal exhaust vents significantly different, or summarize the sinusoidal excitations of appropriate amplitude and frequency based on the test data.
[0041] Step 5: arranging the microphone 5 . The microphone 5 is mounted on the microphone holder 6 , which is placed on the ground. The position of the microphone 5 is adjusted to be arranged at a designated position just in front of the air outlet in the normal direction, with the microphone 5 pointing to the geometric center of the air outlet 4 .
[0042] Step 6: Noise measurement: Apply sinusoidal excitation to the vibration table 2 in the horizontal direction. Measure the noise generated by the closing of the exhaust diaphragm. After the measurement time is determined, multiple measurements need to be performed.
[0043] Step 7: Calculate the sound pressure level. Take the arithmetic average of the sound pressure levels measured multiple times, in dB(A);
[0044] Step 8: Loudness calculation: Take the arithmetic average of the loudness measured multiple times, with the unit being soneGF.
[0045] Step nine, identifying the cause of the abnormal closing sound of the exhaust vent diaphragm according to the test sound pressure level and loudness, or judging whether the closing sound of the exhaust vent diaphragm meets the design requirements.
[0046] Example 1
[0047] A method for measuring the closing sound of a diaphragm of an exhaust vent of a passenger car comprises the following steps:
[0048] 1. Turn on the acoustic data acquisition system and vibration test system, and install the exhaust vent sample.
[0049] 2. When only the fixture is installed and there is no test piece, check whether the background noise of the test site does not exceed 40dB(A).
[0050] 3. Install the vibration table 2 on the vibration table base 1 and install the test fixture 3 at the center position of the vibration table 2.
[0051] 4. The exhaust port 4 is installed on the test fixture 3 according to the actual use state, so that the opening and closing directions of the diaphragm are consistent with the horizontal excitation direction of the vibration table 2;
[0052] 5. Use the vibration test system to apply sinusoidal excitations of different amplitudes and frequencies to the vibration table 2, so that the closing sound produced by the faulty exhaust vent and the normal exhaust vent will be significantly different.
[0053] 6. Install the microphone 5 on the microphone stand 6 , place the microphone stand 6 on the ground, adjust the position of the microphone 5 , and place it 15 cm in front of the exhaust outlet in the normal direction, with the microphone 5 pointing to the geometric center of the exhaust outlet 4 .
[0054] 7. Apply sinusoidal excitation to vibration table 2 in the horizontal direction. Measure the noise generated by the closing of the exhaust diaphragm. Each measurement lasts 30 seconds and three measurements are required.
[0055] 8. Take the arithmetic average of the three measured sound pressure levels, in dB(A);
[0056] 9. Take the arithmetic average of the three loudness measurements, unit: soneGF.
[0057] 10. Identify the cause of abnormal exhaust vent diaphragm closing sound based on the test sound pressure level and loudness, or determine whether the exhaust vent diaphragm closing sound meets the design requirements.
[0058] Example 2
[0059] A method for measuring the closing sound of a diaphragm of an exhaust vent of a passenger car comprises the following steps:
[0060] 1. Turn on the acoustic data acquisition system and vibration test system, and install the exhaust vent sample.
[0061] 2. When only the fixture is installed and there is no test piece, check whether the background noise of the test site does not exceed 40dB(A).
[0062] 3. Install the vibration table 2 on the vibration table base 1 and install the test fixture 3 at the center position of the vibration table 2.
[0063] 4. The exhaust port 4 is installed on the test fixture 3 according to the actual use state, so that the opening and closing directions of the diaphragm are consistent with the horizontal excitation direction of the vibration table 2;
[0064] 5. Summarize the sinusoidal excitation with appropriate amplitude and frequency based on the test data.
[0065] 6. Install the microphone 5 on the microphone stand 6 , place the microphone stand 6 on the ground, adjust the position of the microphone 5 , and place it 15 cm in front of the exhaust outlet in the normal direction, with the microphone 5 pointing to the geometric center of the exhaust outlet 4 .
[0066] 7. Apply sinusoidal excitation to vibration table 2 in the horizontal direction. Measure the noise generated by the closing of the exhaust diaphragm. Each measurement lasts 30 seconds and three measurements are required.
[0067] 8. Take the arithmetic average of the three measured sound pressure levels, in dB(A);
[0068] 9. Take the arithmetic average of the three loudness measurements, unit: soneGF.
[0069] 10. Identify the cause of abnormal exhaust vent diaphragm closing sound based on the test sound pressure level and loudness, or determine whether the exhaust vent diaphragm closing sound meets the design requirements.
[0070] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims
1. A method for measuring the closing sound of the diaphragm of a passenger car exhaust vent, characterized in that: The following steps are involved: A. Turn on the acoustic data acquisition system and vibration test system, and install the exhaust vent sample; B. Measurement of closing sound of diaphragm of passenger car exhaust vent: B1. Detect background noise: When only the fixture is installed and there is no test piece, check whether the background noise of the test site meets the test requirements; B2. Install the test fixture (3); B3. Install the exhaust port (4) on the test fixture (3) so that the opening and closing directions of the diaphragm are consistent with the horizontal excitation direction of the vibration table (2). B4. Perform excitation debugging on the vibration table (2); B5. Arrange the microphone (5) and adjust the position of the microphone (5) to arrange it at a designated position in the normal direction directly in front of the exhaust outlet, with the microphone (5) pointing to the geometric center of the exhaust outlet (4); B6. Noise measurement: Apply sinusoidal excitation to the vibration table (2) in the horizontal direction to measure the noise generated by the closing of the exhaust diaphragm. After the measurement time is determined for each measurement, multiple measurements need to be performed; B7. Sound pressure level calculation: Take the arithmetic average of the sound pressure levels measured multiple times; B8. Loudness calculation: Take the arithmetic average of the loudness measured multiple times; B9. Based on the size of the closing sound of the exhaust vent diaphragm, evaluate whether the design of the exhaust vent diaphragm meets the performance requirements.
2. A passenger car exhaust vent diaphragm closing sound measurement method according to claim 1, characterized in that: Step B1, check whether the background noise of the test site does not exceed 40dB(A).
3. The method for measuring the closing sound of the diaphragm of a passenger car exhaust vent according to claim 1, characterized in that: Step B2, installing the test fixture (3) at the center of the vibration table (2); the vibration table (2) is installed on the vibration table base (1).
4. The method for measuring the closing sound of the diaphragm of a passenger car exhaust vent according to claim 1, characterized in that: Step B3, the air outlet (4) is installed on the test fixture (3) according to the actual use state.
5. The method for measuring the closing sound of the diaphragm of a passenger car exhaust vent according to claim 1, characterized in that: Step B4, applying sinusoidal excitations of different amplitudes and frequencies to the vibration table (2), so that the closing sounds produced by the faulty exhaust vent and the normal exhaust vent are significantly different.
6. The method for measuring the closing sound of the diaphragm of a passenger car exhaust vent according to claim 1, characterized in that: Step B4, summarizing the sinusoidal excitation with appropriate amplitude and frequency based on the test data.
7. The method for measuring the closing sound of the diaphragm of a passenger car exhaust vent according to claim 1, characterized in that: Step B5, installing the microphone (5) on the microphone holder (6), and placing the microphone holder (6) on the ground.
8. A passenger car exhaust vent diaphragm closing sound measurement method according to claim 7, characterized in that: Step B5, adjust the position of the microphone (5) and place it 15 cm in front of the air outlet in the normal direction.
9. The method for measuring the closing sound of the diaphragm of a passenger car exhaust vent according to claim 1, characterized in that: Step B6: Each measurement takes 30 seconds, and 3 measurements are required.
10. The method for measuring the closing sound of the diaphragm of a passenger car exhaust vent according to claim 1, characterized in that: Step B9, identifying the cause of the abnormal closing sound of the exhaust vent diaphragm according to the test sound pressure level and loudness, or judging whether the closing sound of the exhaust vent diaphragm meets the design requirements.