A testing device for obtaining the excitation force of a mid-bass speaker

Abstract

This utility model discloses a mid-bass speaker excitation force acquisition and testing device, including a base. A mid-bass speaker is fixedly connected to the top of the base via four pillars. Force sensors are installed on the pillars, and the detection end of the force sensor is in contact with the mid-bass speaker. A baffle is also fixed to the top of the base via a first bracket. A microphone is fixedly connected to the top of the baffle via a tripod. A laser pickup is fixedly connected to the top of the baffle via a second bracket. The laser pickup is located directly above the mid-bass speaker. This device can accurately test the working excitation force of the mid-bass speaker. This device is used to simulate the state of the audio system installed inside the vehicle body. The force sensors are used to measure the vertical force at the mounting point of the mid-bass speaker, the microphone is used to monitor the quality of the sound source played by the mid-bass speaker, and the laser pickup is used to monitor the diaphragm vibration of the mid-bass speaker.

Description

Technical Field

[0001] This utility model relates to the field of mid-bass speaker testing technology, specifically a mid-bass speaker excitation force acquisition and testing device. Background Technology

[0002] When new energy vehicles operate in pure electric mode, the interior is very quiet due to the absence of engine noise. However, when using the audio system, abnormal noises and vibrations in the cabin can easily be caused by the excitation of the audio system. In order to anticipate this risk in the early stages of vehicle development, it is necessary to obtain the operating excitation force of the mid-bass speakers of the audio system for risk assessment of abnormal noises and vibrations.

[0003] In the industry, abnormal noises and vibrations caused by speakers in new energy vehicles are usually only discovered towards the end of the vehicle development process. Since there are no predictive methods, once abnormal noises occur, huge manpower costs are required for rectification, which may affect the vehicle development cycle. In some cases, the problem only occurs after the vehicle has been launched, causing serious after-sales issues. Utility Model Content

[0004] The purpose of this invention is to provide a testing device for obtaining the excitation force of a mid-bass speaker, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a mid-bass speaker excitation force acquisition and testing device, comprising a base, a mid-bass speaker fixedly connected to the top of the base via four pillars, a force sensor mounted on each pillar, the detection end of the force sensor contacting the mid-bass speaker, the force sensor electrically connected to a data acquisition unit, the mid-bass speaker electrically connected to the data acquisition unit via a power amplifier, the data acquisition unit electrically connected to a computer, a baffle fixedly mounted on the top of the base via a first bracket, a microphone fixedly mounted on the top of the baffle via a tripod, the microphone being located above the mid-bass speaker, a laser pickup fixedly mounted on the top of the baffle via a second bracket, the laser pickup being located directly above the mid-bass speaker and above the microphone, and the laser pickup being electrically connected to the data acquisition unit.

[0006] Preferably, the baffle is a composite wood panel.

[0007] Preferably, the length of the baffle is more than a multiple of the outer diameter of the mid-bass speaker, and the mid-bass speaker is located in the middle of the baffle.

[0008] Preferably, a gap is provided between the baffle and the mid-bass speaker.

[0009] Preferably, the data acquisition unit, power amplifier, and computer are all independent devices located on one side of the base.

[0010] Preferably, the upper surface of the baffle is on the same horizontal plane as the upper surface of the mid-bass speaker.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. This device can accurately test the working excitation force of mid-bass speakers, and has guiding and creative significance and value for risk assessment of resonance and abnormal noise caused by the operation of mid-bass speakers in the early stage of automobile development and for structural design optimization;

[0013] 2. This device is used to simulate the state of an audio system installed inside a vehicle body. It uses a force sensor to measure the vertical force at the mounting point of the mid-bass speaker, a microphone to monitor the quality of the sound source played by the mid-bass speaker, and a laser pickup to monitor the diaphragm vibration of the mid-bass speaker. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the coherence spectrum of this utility model;

[0016] Figure 3 This is an example diagram illustrating the effective results of this utility model.

[0017] In the attached diagram, the following are the reference numerals: 1. Base; 2. Support column; 3. Mid-bass speaker; 4. Force sensor; 5. Data acquisition unit; 6. Power amplifier; 7. Computer; 8. First bracket; 9. Baffle; 10. Tripod; 11. Microphone; 12. Second bracket; 13. Laser pickup. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "bottom" and "top," "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0019] Example: Please refer to Figures 1-3This utility model provides a technical solution: a mid-bass speaker excitation force acquisition and testing device, including a base 1, a mid-bass speaker 3 fixedly connected to the top of the base 1 by four pillars 2, a force sensor 4 mounted on the pillars 2, the detection end of the force sensor 4 in contact with the mid-bass speaker 3, the force sensor 4 electrically connected to a data acquisition unit 5, the force sensor 4 being used to measure the vertical force at the mounting point of the mid-bass speaker 3, the mid-bass speaker 3 being electrically connected to the data acquisition unit 5 via a power amplifier 6, the data acquisition unit 5 being electrically connected to a computer 7, and the top of the base 1 also has... A baffle 9 is fixed to the first bracket 8. A microphone 11 is fixedly connected to the top of the baffle 9 via a tripod 10. The microphone 11 is located above the mid-bass speaker 3 and is used to monitor the quality of the sound source played by the mid-bass speaker 3. A laser pickup 13 is fixedly connected to the top of the baffle 9 via a second bracket 12. The laser pickup 13 is located directly above the mid-bass speaker 3 and above the microphone 11. The laser pickup 13 is electrically connected to the data acquisition unit 5 and is used to monitor the diaphragm vibration of the mid-bass speaker 3.

[0020] In this embodiment, the baffle 9 is a composite wood board, which has a better sound insulation effect and is cheaper than solid wood board.

[0021] In this embodiment, the length of the baffle 9 is more than three times the outer diameter of the mid-bass speaker 3, and the mid-bass speaker 3 is located in the middle of the baffle 9, so that the mid-bass speaker 3 is located in a sufficient accommodating space to enhance the excitation force of the mid-bass speaker 3.

[0022] In this embodiment, a gap is provided between the baffle 9 and the mid-bass speaker 3 to ensure that the baffle 9 does not contact the periphery of the mid-bass speaker 3, thereby avoiding the influence of the baffle 9 on the diaphragm vibration of the mid-bass speaker 3 when it contacts the periphery of the mid-bass speaker 3, which would affect the excitation force of the mid-bass speaker 3.

[0023] In this embodiment, the data acquisition device 5, the power amplifier 6, and the computer 7 are all independent devices located on one side of the base 1.

[0024] In this embodiment, the upper surface of the baffle 9 and the upper surface of the mid-bass speaker 3 are on the same horizontal plane to simulate the state of the audio system installed in the vehicle body. The force sensor 4 is used to measure the vertical force at the mounting point of the mid-bass speaker 3, the microphone 11 is used to monitor the quality of the sound source played by the mid-bass speaker 3, and the laser pickup 13 is used to monitor the diaphragm vibration of the mid-bass speaker 3.

[0025] Usage steps: 1. First, input the audio source on the mid-bass speaker 3: set the frequency sweep to 20-120Hz and the sweep speed to 1Hz / s;

[0026] 2. Speaker warm-up: Play three frequency sweeps within the speaker's operating voltage range;

[0027] 3. Play a 20-120Hz sweep frequency signal at four operating voltages of the speaker: 0.25Vmax, 0.5Vmax, 0.75Vmax and 1Vmax, and record the power spectrum of the played sound, the coherence spectrum and frequency response spectrum of the played sound relative to the input sound source, and the spectrum of the force sensor.

[0028]

[0029] Audio source record sheet

[0030] 4. For example Figure 2 As shown, check the coherence spectrum of the sound measured by the microphone and the input signal of the speaker in each group of data. If the coherence in the 20-100Hz frequency band is above 0.95, then the group is recorded as valid data.

[0031] 5. For example Figure 3 As shown, the force sensor spectrum in the 20-100Hz frequency band of the recorded valid data group is exported, and this result is a valid result.

[0032] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A mid-bass loudspeaker excitation force acquisition test apparatus, characterized by: The device includes a base (1), on which a mid-bass speaker (3) is fixedly connected via four pillars (2). A force sensor (4) is provided on the pillars (2), and the detection end of the force sensor (4) is in contact with the mid-bass speaker (3). A baffle (9) is also fixedly connected to the top of the base (1) via a first bracket (8). A microphone (11) is fixedly connected to the top of the baffle (9) via a tripod (10). The microphone (11) is located on one side above the mid-bass speaker (3). A laser pickup (13) is fixedly connected to the top of the baffle (9) via a second bracket (12). The laser pickup (13) is located directly above the mid-bass speaker (3) and above the microphone (11).

2. The mid-bass loudspeaker excitation force acquisition test device according to claim 1, wherein: The force sensor (4) is electrically connected to the data acquisition unit (5), the mid-bass speaker (3) is electrically connected to the data acquisition unit (5) through the power amplifier (6), and the data acquisition unit (5) is electrically connected to the computer (7).

3. The mid-bass speaker excitation force acquisition and testing device according to claim 2, characterized in that: The laser pickup (13) is electrically connected to the data acquisition unit (5).

4. The mid-bass speaker excitation force acquisition and testing device according to claim 3, characterized in that: The baffle (9) is a composite wood board.

5. The mid-bass speaker excitation force acquisition and testing device according to claim 4, characterized in that: The length of the baffle (9) is more than three times the outer diameter of the mid-bass speaker (3), and the mid-bass speaker (3) is located in the middle of the baffle (9).

6. The mid-bass speaker excitation force acquisition and testing device according to claim 5, characterized in that: A gap is provided between the baffle (9) and the mid-bass speaker (3).

7. The mid-bass speaker excitation force acquisition and testing device according to claim 6, characterized in that: The data acquisition unit (5), power amplifier (6) and computer (7) are all independent devices located on one side of the base (1).

8. The mid-bass speaker excitation force acquisition and testing device according to claim 7, characterized in that: The upper surface of the baffle (9) is on the same horizontal plane as the upper surface of the mid-bass speaker (3).

Images