Human head surrounding sound field distribution test support and test system

Abstract

The utility model relates to the technical field of sound field distribution testing, in particular to a human head surrounding sound field distribution testing support and a human head surrounding sound field distribution testing system, and the testing support comprises a support main body which is of a circumferential structure and is provided with an opening for a cab seat headrest to enter at the bottom; sound pressure sensors are distributed on the bracket main body; the fixing structure is arranged in the support body, and the fixing structure is connected with the cab seat headrest. According to the technical scheme of the utility model, the problem that the comprehensive scanning test of the sound field of the cab is difficult to realize due to the fact that the sound field distribution in the existing engineering machinery cab is obtained by means of simulation is solved. The problems of complicated operation, high time cost, poor consistency in the moving process and unsuitability for the manned driving test of the whole machine caused by the means of pasting a plurality of sensors on a long rod and continuously moving the long rod to carry out a cab sound field scanning test are solved.

Description

Technical Field

[0001] This utility model relates to the field of sound field distribution testing technology, and in particular to a sound field distribution testing bracket and testing system around the human head. Background Technology

[0002] The sound field refers to the region in a medium where sound waves exist. With the widespread application of construction machinery in urban and rural construction, agricultural production, and mining, higher requirements are being placed on the sound field of the construction machinery cab.

[0003] Currently, the sound field distribution in the cab of construction machinery is mostly obtained through simulation. Usually, the sound pressure level at individual locations in the cab is tested experimentally, and sound pressure sensors are often attached to certain accessories in the cab or placed using simple brackets. However, this method is difficult to achieve a comprehensive scan of the cab's sound field. Alternatively, several sensors can be attached to a long pole, and the cab's sound field can be scanned by continuously moving the pole. However, this method is more complex to operate, has higher time costs, and suffers from poor consistency during movement, making it unsuitable for testing the entire machine while it is in operation with passengers.

[0004] Therefore, this utility model proposes a test bracket and test system for the sound field distribution around the human head. Utility Model Content

[0005] The present invention provides a test bracket and test system for the sound field distribution around the human head. It mainly solves the problems of existing methods that rely on simulation to obtain the sound field distribution in the cab of engineering machinery, which makes it difficult to achieve a comprehensive scanning test of the cab sound field; and the problems of the method of attaching several sensors to a long rod and scanning the cab sound field by continuously moving the long rod, which is complicated to operate, time-consuming, and has poor consistency during the movement process, making it unsuitable for testing the entire machine with passengers.

[0006] This utility model proposes a test bracket for the sound field distribution around the human head, comprising:

[0007] The main body of the bracket has a circumferential structure, and its bottom has an opening for the headrest of the driver's seat to enter; sound pressure sensors are distributed on the main body of the bracket.

[0008] A fixed structure is built into the main body of the bracket, and the fixed structure is connected to the headrest of the driver's seat.

[0009] Preferably, the main body of the support is a cage structure with an open end face.

[0010] Preferably, the support body comprises:

[0011] The enclosure consists of five panels, each equipped with a sound pressure sensor; the main body of the support is formed by the four sides of any one of the enclosure panels abutting against the other enclosure panels and being arranged perpendicularly.

[0012] Preferably, the four enclosure pieces that form the perimeter of the main body of the support are identical in shape and all have a hollow structure.

[0013] Preferably, the enclosure piece constituting the top surface of the support has the same shape as the other four enclosure pieces, and all of them are designed with a hollow structure.

[0014] Preferably, the fixing structure is detachably connected to any of the enclosure pieces that form the perimeter of the main body of the support.

[0015] Preferably, the fixing structure includes:

[0016] Ring-shaped component;

[0017] A fixing member is fixedly connected to the annular member and is set perpendicular to the annular member; the fixing member has a through hole, and the enclosure piece that is detachably connected to the fixing member has a positioning hole; external fasteners pass through the through hole and the positioning hole to fix the fixing member and the enclosure piece.

[0018] Preferably, the annular member is made of an elastic material.

[0019] Preferably, each of the enclosure panels is provided with a plurality of fixed supports, and the fixed supports are evenly distributed on the enclosure panel;

[0020] The fixed bracket described herein is aligned with the sound pressure sensor.

[0021] This utility model also proposes a sound field distribution testing system around the human head, including the aforementioned testing bracket, and further including:

[0022] Test assembly module;

[0023] The data acquisition front end is electrically connected to all the sound pressure sensors on the test bracket, and the data acquisition front end is also electrically connected to the test assembly module.

[0024] As can be seen from the above, the following beneficial effects can be obtained by applying the technical solution provided by this utility model:

[0025] First, the test bracket proposed in this utility model can be matched with the headrest of the driver's seat, and the circumferential structure of the bracket body allows the sound pressure sensor installed on it to surround the headrest area. Since the headrest and the driver's head are approximately at the same position, the use of this test bracket can ensure that the sound pressure sensor monitoring data can achieve a comprehensive scanning test of the sound field in the driver's cab.

[0026] Secondly, the test bracket proposed in this utility model is fixed to the headrest of the driver's seat and is a rigid circumferential structure. The position of the sound pressure sensor remains fixed during the data collection process, ensuring consistency during movement and further guaranteeing the accuracy of the test results.

[0027] Third, the testing system proposed in this utility model includes a testing bracket. Based on the fixation of the testing bracket, the test results of the testing system are more accurate and can be reused, thus reducing testing costs. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the test bracket in Embodiment 1 of this utility model;

[0030] Figure 2 This is a schematic diagram of the fixing structure on the test bracket in Embodiment 1 of this utility model;

[0031] Figure 3 This is a schematic diagram showing the positional relationship between the test bracket and the driver in Embodiment 1 of this utility model;

[0032] Figure 4 This is a structural block diagram of the testing system in Embodiment 2 of this utility model. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0034] The existing method of obtaining the sound field distribution in the cab of construction machinery relies on simulation, which makes it difficult to achieve a comprehensive scanning test of the cab's sound field. In addition, the method of attaching several sensors to a long pole and scanning the cab's sound field by continuously moving the pole results in complex operation, high time cost, and poor consistency during the movement process, making it unsuitable for testing the entire machine while it is in operation with passengers.

[0035] Example 1

[0036] like Figures 1-3 As shown, in order to solve the above problems, this embodiment proposes a sound field distribution test bracket 100 around the human head, including a bracket body 110 and a fixing structure 120; the bracket body 110 has a circumferential structure and an opening at its bottom for the driver's seat headrest to enter; sound pressure sensors 130 are distributed on the bracket body 110; the fixing structure 120 is built into the bracket body 110 and is connected to the driver's seat headrest.

[0037] Preferably, in this embodiment, the bottom of the bracket body 110 is an integral open end face, or it can be provided with an opening for the driver's seat to enter, the size of which is at least equal to the cross-sectional size of the driver's seat.

[0038] Preferably, in this embodiment, the fixing structure 120 is set so that after it is fixed to the headrest, the driver's head is located at the center of the support body 110, that is, the distance between all the sound pressure sensors 130 on the support body 110 and the head should be approximately equal.

[0039] Preferably, in this embodiment, fixed brackets 111 are evenly distributed on the outward-facing end face of the bracket body 110, and the sound pressure sensor 130 is fixedly installed with the fixed brackets 111 one by one.

[0040] In this embodiment, the circumferential structure of the support body 110 and the sound pressure sensor 130 disposed thereon can ensure that after the test support 100 is fixed in position, the sound pressure sensor 130 and the driver's head are distributed in a circumferential manner to accurately obtain the surrounding sound field distribution of the driver's head.

[0041] More specifically, the support body 110 is a cage structure with an open end face.

[0042] Preferably, in this embodiment, the support body 110 is enclosed on all end faces except for the open end face. That is, in this embodiment, the sound pressure sensor 130 and the driver's head are arranged in a surrounding manner except for the bottom.

[0043] More specifically, the support body 110 includes five enclosure panels 112; each enclosure panel 112 is equipped with a sound pressure sensor 130; the support body 110 is formed by the four sides of any enclosure panel 112 abutting against the other enclosure panels 112 and being arranged perpendicularly.

[0044] Preferably, in this embodiment, all the enclosure panels 112 are the same in shape and size, and all adopt a hollow structure. Preferably, but not limited to, in this embodiment, the enclosure panels 112 are square enclosure panels 112 with side lengths in the range of [450mm, 500mm], and each enclosure panel 112 is provided with a hollow structure with four square openings, and the thickness is 2-4mm.

[0045] Preferably, in this embodiment, the fixing brackets 111 on each enclosure piece 112 are respectively set at the two ends and the midpoint of its four sides, and a central fixing bracket 111 is also set at the center of the enclosure piece 112, that is, nine fixing brackets 111 are set on each enclosure piece 112.

[0046] Preferably, in this embodiment, the fixing bracket 111 of each enclosure panel 112 is arranged to face outward and protrude vertically, which facilitates the installation with the sound pressure sensor 130 and ensures that the multiple fixing brackets 111 at the upper corners of adjacent enclosure panels 112 do not affect each other.

[0047] Preferably, in this embodiment, the enclosure panel 112 may be made of a transparent and lightweight material. Preferably, but not limited to, in this embodiment, the enclosure panel 112 is made of acrylic material.

[0048] In this embodiment, using baffles 112 of the same size ensures that after the test bracket 100 is fixed in conjunction with the headrest of the driver's seat, the distance between the driver's head and the sound pressure sensor 130 on the test bracket 100 is approximately equal, thus ensuring that the sound pressure sensor 130 detection data can serve as an effective reference for testing the sound field distribution around the human head.

[0049] More specifically, the fixing structure 120 is detachably connected to any of the baffle pieces 112 that form the perimeter of the support body 110.

[0050] Preferably, the fixing structure 120 includes an annular member 121 and a fixing member 122 fixedly connected to the annular member 121; the fixing member 122 is arranged perpendicular to the annular member 121; a through hole 123 is provided on the fixing member 122, and a positioning hole is provided on the baffle plate 112 detachably connected to the fixing member 122; external fasteners are sequentially passed through the through hole 123 and the positioning hole to fix the fixing member 122 and the baffle plate 112. Preferably, but not limited to, the inner diameter of the through hole 123 and the positioning hole are equal.

[0051] Preferably, but not limited to, the positioning holes on the enclosure plate 112 in this embodiment are provided in a through structure, that is, the length of the external fastener is not limited by the thickness of the fastener 122 and the enclosure plate 112.

[0052] Preferably, in this embodiment, the fixing member 122 is fixedly connected to the symmetrical ends of the ring member 121 respectively, thereby improving the tightness of the connection between the fixing member 122 and the ring member 121.

[0053] Preferably, in this embodiment, the annular member 121 is made of an elastic material, preferably a nylon material with strong elasticity.

[0054] In this embodiment, the annular member 121 is fitted onto the headrest of the driver's seat. Therefore, the use of elastic material can improve the adaptability of the annular member 121 to the headrests of different novice drivers. Furthermore, due to the fixed connection between the fixing member 122 and the annular member 121, the position of the bracket body 110 and the headrest of the driver's seat remains fixed.

[0055] In summary, the sound field distribution test bracket 100 around the human head proposed in this embodiment 1 is suitable for both static and mobile testing, and is fixedly installed with the headrest of the driver's seat to ensure consistency during movement.

[0056] Example 2

[0057] like Figure 4 As shown, in order to solve the aforementioned problems, this embodiment proposes a sound field distribution testing system around the human head, including the test bracket 100 described in Embodiment 1, and also including a test assembly module 200 and a data acquisition front end 300; the input end of the data acquisition front end 300 is connected to all the sound pressure sensors 130 on the test bracket 100, and the output end is connected to the test assembly module 200.

[0058] Preferably, in this embodiment, the test assembly module 200 uses a test computer.

[0059] In this embodiment, the data from all sound pressure sensors 130 are collected to the test assembly module 200 after being marked and processed by the data acquisition front end 300, and then analyzed by the test assembly module 200 to obtain the sound field distribution around the human head.

[0060] In summary, Embodiments 1 and 2 present a test bracket and test system for the sound field distribution around the human head. By setting a fixed test bracket, the sound pressure sensor acquires accurate sound field data around the human head, and then the test system obtains accurate test data and conclusions. At the same time, the test bracket maintains consistency in both static and moving states.

[0061] The embodiments described above do not constitute a limitation on the scope of protection of this technical solution. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the above embodiments should be included within the scope of protection of this technical solution.

Claims

1. A test stand for sound field distribution around the human head, characterized in that, include: The main body of the bracket has a circumferential structure, and its bottom has an opening for the headrest of the driver's seat to enter; sound pressure sensors are distributed on the main body of the bracket. A fixed structure is built into the main body of the bracket, and the fixed structure is connected to the headrest of the driver's seat.

2. The sound field distribution testing bracket around the human head according to claim 1, characterized in that: The main body of the support is a cage-like structure with an open end face.

3. The sound field distribution testing bracket around the human head according to claim 2, characterized in that, The support body includes: The enclosure consists of five panels, each equipped with a sound pressure sensor; the main body of the support is formed by the four sides of any one of the enclosure panels abutting against the other enclosure panels and being arranged perpendicularly.

4. The sound field distribution testing bracket around the human head according to claim 3, characterized in that: The four enclosure pieces that form the perimeter of the main body of the support are identical in shape and all have a hollow structure.

5. A test stand for sound field distribution around the human head according to claim 4, characterized in that: The enclosure panel forming the top surface of the support has the same shape as the other four enclosure panels, and all of them are designed with a hollow structure.

6. A test stand for sound field distribution around the human head according to any one of claims 3 to 5, characterized in that: The fixing structure is detachably connected to any of the enclosure pieces that form the perimeter of the main body of the support.

7. A test stand for sound field distribution around the human head according to claim 6, characterized in that, The fixing structure includes: Ring-shaped component; A fixing member is fixedly connected to the annular member and is set perpendicular to the annular member; the fixing member has a through hole, and the enclosure piece that is detachably connected to the fixing member has a positioning hole; external fasteners pass through the through hole and the positioning hole to fix the fixing member and the enclosure piece.

8. A test stand for sound field distribution around the human head according to claim 7, characterized in that: The annular component is made of an elastic material.

9. A test stand for sound field distribution around the human head according to claim 6, characterized in that: Each of the aforementioned enclosure panels is provided with multiple fixed supports, and the fixed supports are evenly distributed on the enclosure panel; The fixed bracket described herein is aligned with the sound pressure sensor.

10. A sound field distribution testing system around the human head, characterized in that, The test fixture, comprising any one of claims 1 to 9, further comprises: Test assembly module; The data acquisition front end is electrically connected to all the sound pressure sensors on the test bracket, and the data acquisition front end is also electrically connected to the test assembly module.

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