Microphone fixing device for testing noise in semi-anechoic room

Abstract

The utility model provides a microphone fixing device for testing noise in a semi-anechoic room, which comprises a device body rotationally connected with a wall. The device body comprises a telescopic mechanism, a clamping assembly is arranged at the free end, away from the wall body, of the telescopic mechanism so as to detachably fix a microphone, and the telescopic mechanism can do axial telescopic motion so as to adjust the position of the microphone relative to a tested assembly. According to the utility model, the telescoping mechanism is installed at a proper position on the semi-silencing wall body through one-time measurement so as to meet the position requirements of the microphone and the tested assembly, and the microphone is rapidly disassembled and assembled through the clamping assembly at the end part of the telescoping mechanism, so that the risk that the microphone is damaged due to falling is avoided; the position of the microphone relative to the measured assembly is adjusted through the axial telescoping of the telescoping mechanism, so that the process that the position of the microphone from the measured assembly needs to be measured again when the microphone is dismounted each time is avoided, and time and labor are saved. And during a non-noise test, the telescopic mechanism can contract to be attached to the wall body.

Description

Technical Field

[0001] This utility model relates to the technical field of NVH semi-anechoic indoor noise testing devices, specifically to a microphone fixing device for semi-anechoic indoor noise testing. Background Technology

[0002] Noise testing in a semi-anechoic chamber typically requires two or more microphones.

[0003] Currently, the main method for fixing microphones used in semi-anechoic chamber noise testing is a floor-standing stand structure, which has the following drawbacks:

[0004] On the one hand, the stand is prone to tipping over, which can easily damage the microphone it holds.

[0005] On the other hand, the microphones need to be disassembled and reassembled for each test. Since there are certain positional requirements between the microphones and the assembly under test in noise testing, the positional coordinates of each microphone relative to the assembly under test need to be remeasured after reinstallation, which is time-consuming and laborious.

[0006] Therefore, it is crucial to design a safe, stable microphone mounting device for semi-anechoic indoor noise testing that can improve testing efficiency. Utility Model Content

[0007] To solve the above-mentioned technical problems, this utility model provides a microphone fixing device for semi-anechoic indoor noise testing, including a device body, which is rotatably connected to a wall; the device body includes a telescopic mechanism, and a clamping component is provided at the free end of the telescopic mechanism away from the wall to detachably fix the microphone; the telescopic mechanism can move axially to adjust the position of the microphone relative to the assembly under test.

[0008] Furthermore, at least two of the device bodies are symmetrically arranged around the assembly being tested.

[0009] Furthermore, the telescopic mechanism includes a first telescopic rod and a second telescopic rod, wherein:

[0010] One end of the first telescopic rod is rotatably and fixedly connected to the wall via a rotating support;

[0011] The second telescopic rod is nested inside the first telescopic rod;

[0012] The first telescopic rod and the second telescopic rod are respectively provided with a first bolt hole and a second bolt hole along their axial direction. The telescopic length of the telescopic mechanism is adjusted by inserting bolts into the corresponding first bolt hole and second bolt hole.

[0013] Furthermore, the second telescopic rod is marked with graduations along its axial direction; the first bolt holes and the second bolt holes are evenly spaced.

[0014] Furthermore, the second telescopic rod is provided with a limiting stop to limit the stretching stroke of the second telescopic rod relative to the first telescopic rod.

[0015] Furthermore, the clamping assembly includes a first hard plastic plate and a second hard plastic plate disposed opposite to each other, wherein:

[0016] The first rigid plastic plate is fixed to the free end of the second telescopic rod;

[0017] The first hard plastic plate and the second hard plastic plate are connected by bolts, and the distance between the first hard plastic plate and the second hard plastic plate is reduced by tightening the bolts to clamp the microphone.

[0018] Furthermore, the contact surfaces of the first hard plastic plate, the second hard plastic plate, and the microphone are provided with opposing arc-shaped grooves to secure the microphone.

[0019] Furthermore, the contact surfaces of the first hard plastic plate, the second hard plastic plate, and the microphone are provided with anti-slip rubber pads.

[0020] Furthermore, the rotating support includes a 90° angle hinge and a fixed plate, wherein:

[0021] The 90° corner hinges are fixed to the wall and the fixing plate respectively;

[0022] The fixing plate is installed at the end of the first telescopic rod.

[0023] Furthermore, the telescopic mechanism is made of plastic.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] This invention allows for the installation of a telescopic mechanism at an appropriate position on a semi-anechoic wall through a single measurement, satisfying the positional requirements of the microphone and the assembly under test. The microphone can be quickly installed and removed via a clamping assembly at its end. This avoids the risk of damage to the microphone due to tipping over. Furthermore, the axial extension and retraction of the telescopic mechanism adjusts the microphone's position relative to the assembly under test, eliminating the need to remeasure the microphone's distance from the assembly each time it is installed or removed, saving time and effort. In addition, during non-noise testing, the telescopic mechanism can retract to fit snugly against the wall. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure disclosed in the embodiment of this utility model;

[0027] Figure 2 This is a schematic diagram of the telescopic mechanism disclosed in an embodiment of the present utility model.

[0028] In the picture:

[0029] 00. Assembly under test; 01. Dynamometer; 02. Half shaft;

[0030] 10. Telescopic mechanism;

[0031] 11. First telescopic pole; 12. Second telescopic pole;

[0032] 21. First rigid plastic sheet; 22. Second rigid plastic sheet;

[0033] 31. Fixing plate;

[0034] 40. Microphone. Detailed Implementation

[0035] To make the technical solutions and effects of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0036] Please see Figure 1 The present invention aims to provide a microphone fixing device for semi-anechoic indoor noise testing, which solves the problems of existing floor microphone stands that are prone to tipping over and damaging the microphone, and the need to remeasure the distance between the microphone and the assembly under test every time the microphone is disassembled and reassembled.

[0037] In this embodiment, the assembly under test 00 includes a motor and a reducer, and the dynamometer 01 is connected to both ends of the assembly under test 00 via a half shaft 02.

[0038] The dynamometer 01 is mounted on the dynamometer base and is used to provide the set speed to the motor under test, so as to absorb the kinetic energy of the motor under test or provide it with power. One dynamometer 01 is provided for each half-shaft 02.

[0039] Half-shaft 02 transmits the torque from the differential to the wheels, thus propelling the car. The two half-shafts 02 are connected to the dynamometer 01 via a spline connection.

[0040] The microphone fixing device for noise testing in a semi-anechoic chamber provided by this utility model includes a device body, which is rotatably connected to the wall of the semi-anechoic chamber, and at least two device bodies are symmetrically arranged around the assembly under test.

[0041] The main body of the device includes a telescopic mechanism 10. The free end of the telescopic mechanism 10 away from the wall is provided with a clamping component to detachably fix the microphone 40. The telescopic mechanism 10 can move axially to adjust the position of the microphone 40 relative to the measured assembly 00.

[0042] Please see Figure 2 The telescopic mechanism 10 includes a first telescopic rod 11 and a second telescopic rod 12. One end of the first telescopic rod 11 is rotatably fixed to the wall via a rotating support; a clamping assembly is installed at the free end of the second telescopic rod 12.

[0043] The rotating support includes a 90° angle hinge and a fixing plate 31. The fixing plate 31 is provided at the end of the first telescopic rod 11 that contacts the wall; the 90° angle hinge is fixed to both the wall and the fixing plate 31, enabling the telescopic mechanism 10 to rotate 90° relative to the wall. Since the 90° angle hinge is a conventional and readily available connector in this field, it will not be described in detail here.

[0044] The first telescopic rod 11 and the second telescopic rod 12 are described below.

[0045] The second telescopic rod 12 is nested inside the first telescopic rod 11.

[0046] The first telescopic rod 11 and the second telescopic rod 12 are respectively provided with a first bolt hole and a second bolt hole in their axial directions. The telescopic length of the telescopic mechanism 10 is adjusted by inserting bolts into the corresponding first bolt holes and second bolt holes.

[0047] The second telescopic rod 12 has axial markings with 10cm intervals, used to quickly locate the installation position of the microphone 40 relative to the assembly under test 00.

[0048] The first bolt hole and the second bolt hole are set at equal intervals.

[0049] Optionally, the second telescopic rod 12 is provided with a limiting block, and the inner wall of the first telescopic rod 11 is provided with a limiting protrusion. The limiting block and the limiting protrusion cooperate to limit the stretching stroke of the second telescopic rod 12 relative to the first telescopic rod 11, so as to prevent the first telescopic rod 11 and the second telescopic rod 12 from being overstretched and separated.

[0050] Optionally, the first telescopic rod 11 is shaped like a frustum with a gradually decreasing diameter. The second telescopic rod 12 is inserted into the first telescopic rod 11 starting from the end with the larger diameter. As the insertion process progresses, the second telescopic rod 12 gradually extends out from the end with the smaller diameter of the first telescopic rod 11. As the second telescopic rod 12 extends, the contact area and friction distribution between the two change, creating a natural resistance. After both reach a certain degree of stretching, this resistance increases significantly, limiting the second telescopic rod 12 from further outward stretching, thereby effectively preventing the first telescopic rod 11 and the second telescopic rod 12 from being overstretched and separating.

[0051] To avoid static electricity from the metal material affecting the test results, the telescopic mechanism 10 in this embodiment is made of plastic.

[0052] Next, the clamping components will be explained.

[0053] Optionally, the clamping assembly includes a first rigid plastic plate 21 and a second rigid plastic plate 22 disposed opposite to each other.

[0054] The first hard plastic plate 21 is fixed to the free end of the second telescopic rod 12; the first hard plastic plate 21 and the second hard plastic plate 22 are connected by bolts, and the distance between the first hard plastic plate 21 and the second hard plastic plate 22 is reduced by tightening the bolts to clamp the microphone 40.

[0055] Preferably, the contact surfaces of the first hard plastic plate 21 and the second hard plastic plate 22 with the microphone are provided with opposing arc-shaped grooves to stabilize the microphone 40. The contact surfaces of the first hard plastic plate 21 and the second hard plastic plate 22 with the microphone are provided with anti-slip rubber pads.

[0056] Preferably, the clamping component may be equipped with a laser ranging module, which can display the distance between the microphone 40 and the measured assembly 00.

[0057] During installation, fix the 90° corner hinge to the preset position on the wall; stretch the first telescopic rod 11 and the second telescopic rod 12 to the target length and lock them with bolts; fix the microphone 40 with the clamping assembly so that the microphone 40 is within the test distance range relative to the assembly under test. After the noise test is completed, remove the microphone, and the telescopic mechanism retracts and rotates to fit tightly against the wall, freeing up space.

[0058] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A microphone fixing device for semi-anechoic chamber noise testing, characterized in that, The device includes a device body that is rotatably connected to a wall. The device body includes a telescopic mechanism (10), and the free end of the telescopic mechanism (10) away from the wall is provided with a clamping component to detachably fix the microphone (40). The telescopic mechanism (10) can move axially to adjust the position of the microphone (40) relative to the measured assembly (00).

2. The microphone fixing device for semi-anechoic chamber noise testing according to claim 1, characterized in that, The device body is arranged symmetrically in two forms around the assembly being measured (00).

3. The microphone fixing device for semi-anechoic chamber noise testing according to claim 1, characterized in that, The telescopic mechanism (10) includes a first telescopic rod (11) and a second telescopic rod (12), wherein: One end of the first telescopic rod (11) is rotatably and fixedly connected to the wall via a rotating support; The first telescopic rod (11) is nested inside the second telescopic rod (12); The first telescopic rod (11) and the second telescopic rod (12) are respectively provided with a first bolt hole and a second bolt hole in their axial directions. The telescopic length of the telescopic mechanism (10) is adjusted by inserting bolts into the corresponding first bolt hole and second bolt hole.

4. The microphone fixing device for semi-anechoic chamber noise testing according to claim 3, characterized in that, The second telescopic rod (12) has axial markings; the first bolt hole and the second bolt hole are equally spaced.

5. The microphone fixing device for semi-anechoic chamber noise testing according to claim 3, characterized in that, The second telescopic rod (12) is provided with a limiting stop to limit the stretching stroke of the second telescopic rod (12) relative to the first telescopic rod (11).

6. The microphone fixing device for semi-anechoic chamber noise testing according to claim 3, characterized in that, The clamping assembly includes a first hard plastic plate (21) and a second hard plastic plate (22) disposed opposite to each other, wherein: The first rigid plastic plate (21) is fixed to the free end of the second telescopic rod (12); The first hard plastic plate (21) and the second hard plastic plate (22) are connected by bolts, and the distance between the first hard plastic plate (21) and the second hard plastic plate (22) is reduced by tightening the bolts to clamp the microphone (40).

7. The microphone fixing device for semi-anechoic chamber noise testing according to claim 6, characterized in that, The first hard plastic plate (21), the second hard plastic plate (22) and the contact surface of the microphone are provided with opposite arc-shaped grooves to stabilize the microphone (40).

8. The microphone fixing device for semi-anechoic chamber noise testing according to claim 6, characterized in that, The contact surfaces of the first hard plastic plate (21), the second hard plastic plate (22) and the microphone are provided with anti-slip rubber pads.

9. The microphone fixing device for semi-anechoic chamber noise testing according to claim 3, characterized in that, The rotating support includes a 90° angle hinge and a fixed plate (31), wherein: The 90° corner hinges are fixed to the wall and the fixing plate (31) respectively; The fixing plate (31) is installed at the end of the first telescopic rod (11).

10. The microphone fixing device for semi-anechoic chamber noise testing according to claim 1, characterized in that, The telescopic mechanism (10) is made of plastic.

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