An acoustic environment reproduction test chamber for a vehicle

Abstract

This invention provides an automotive acoustic environment reproduction test chamber, relating to the field of automotive acoustic simulation technology. The automotive acoustic environment reproduction test chamber includes: a chamber, with a vertically installed sound insulation panel connected to one side of the chamber, dividing the chamber into a first inner chamber and a second inner chamber; the upper part of the sound insulation panel has multiple air vents; and a wind tunnel fan, the air outlet of which is connected to the first inner chamber. This invention integrates wind tunnel testing and acoustic environment reproduction testing within the same chamber. A dust removal mechanism can remove dust and particulate matter that may be shed from the vehicle itself and other contaminants stirred up by airflow in the first inner chamber during the test, helping to maintain the cleanliness of the testing environment and reduce the long-term negative impact of dust on acoustic testing accuracy and vehicle testing conditions. The sound insulation panel design provides a relatively pure acoustic background for the first inner chamber, thereby improving testing accuracy.

Description

Technical Field

[0001] This invention relates to the field of automotive acoustic simulation technology, and more particularly to an automotive acoustic environment reproduction test chamber. Background Technology

[0002] In the field of automotive R&D and quality verification, vehicle noise, vibration, and harshness (NVH) performance are core indicators for evaluating its comfort and premium feel. To accurately simulate the complex acoustic environment encountered by vehicles in actual road driving, the industry typically uses acoustic environment reproduction test chambers. These chambers are lined with high-performance sound-absorbing materials and equipped with multi-channel audio systems to create a clean and controllable acoustic testing space for evaluating the vehicle's own noise or playing simulated road noise, wind noise, and other external excitation signals.

[0003] However, in traditional R&D processes, acoustic environmental testing and aerodynamic wind tunnel testing are often conducted in two separate dedicated facilities. This separation not only occupies a huge amount of factory space but also increases equipment investment and operating costs. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing an acoustic environment reproduction test chamber for automobiles.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An acoustic environment reproduction test chamber for automobiles includes: The cabin has a vertically installed soundproof panel on one side, which divides the cabin into a first inner cabin and a second inner cabin. The upper part of the soundproof panel has multiple air vents. The wind tunnel fan has its outlet connected to the first inner chamber. The dust removal mechanism is connected to the second inner chamber, so that the air in the first inner chamber enters the dust removal mechanism through the air vents and the second inner chamber in sequence. The sound system consists of multiple speakers connected to the interior ceiling of the first interior cabin.

[0006] Preferably, the automotive acoustic environment reproduction test chamber further includes a sealing mechanism, which includes a rubber plug. When the dust removal mechanism is not working, the rubber plug is gradually inserted into the corresponding air hole, and when the dust removal mechanism is working, the rubber plug is removed from the corresponding air hole.

[0007] Preferably, the sealing mechanism further includes an inflation unit. As the rubber plug is gradually inserted into the corresponding air hole, the inflation unit gradually inflates the rubber plug. As the rubber plug is removed from the corresponding air hole, the inflation unit gradually evacuates the rubber plug.

[0008] Preferably, the sealing mechanism further includes a transverse unit, which is used to push the rubber plug into the corresponding air hole or to move the rubber plug out of the corresponding air hole.

[0009] Preferably, the lateral movement unit includes an electric actuator and a push plate. The electric actuator is connected to the inner wall of the second inner compartment, and the output end of the electric actuator is connected to the push plate. Multiple rubber plugs are connected to the side of the push plate facing the air vent.

[0010] Preferably, the inflation unit includes a cylinder, a piston, a spring, a rod, and a baffle. The cylinder is connected to the push plate, the piston is slidably connected to the inner wall of the cylinder, one end of the rod is connected to the piston, and the other end of the rod passes through the cylinder and is connected to the baffle. The spring is sleeved on the rod, and the two ends of the spring abut against the opposite surfaces of the baffle and the cylinder, respectively. The push plate has an air passage, one end of which communicates with the bottom of the inner cavity of the cylinder, and the other end of which communicates with the rubber plug. The top of the inner cavity of the cylinder has an air hole.

[0011] Preferably, the inner walls of the cabin are lined with sound-absorbing cotton.

[0012] Preferably, the dust removal mechanism includes an air inlet duct, an induced draft fan, an air outlet duct, and a filter unit. The induced draft fan is connected to the top surface of the compartment. The air inlet of the induced draft fan is connected to one end of the air inlet duct, and the other end of the air inlet duct is connected to the inner top of the second inner compartment. The air outlet of the induced draft fan is connected to the air outlet duct, and the filter unit is located in the air outlet duct.

[0013] Preferably, the filtration unit is a filter element, and the filter element is connected to the air outlet of the air outlet duct.

[0014] Compared with the prior art, the beneficial effects of the present invention are: integrating wind tunnel testing (simulating driving wind) and acoustic environment reproduction testing (simulating various sounds) into the same chamber, the dust removal mechanism can remove pollutants such as dust stirred up by airflow in the first inner chamber during the test and particles that may fall off the vehicle itself, which helps to maintain the cleanliness of the test environment and reduce the long-term negative impact of dust on the acoustic test accuracy (such as contaminating sound-absorbing materials and sensors) and the vehicle test status (such as contaminating engine intake air). The design of the sound insulation panel provides a relatively pure acoustic background for the first inner chamber, thereby improving the test accuracy. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the front structure of the automotive acoustic environment reproduction test chamber proposed in this invention. Figure 2 This is a side view of the automotive acoustic environment reproduction test chamber proposed in this invention; Figure 3 This is a front view of the automotive acoustic environment reproduction test chamber proposed in this invention; Figure 4This is a schematic diagram of the sealing mechanism in the automotive acoustic environment reproduction test chamber proposed in this invention when it is not in operation; Figure 5 This is a schematic diagram of the structure of the automotive acoustic environment reproduction test chamber proposed in this invention during operation. Figure 6 This is a schematic diagram of the dust removal mechanism in the automotive acoustic environment reproduction test chamber proposed in this invention.

[0016] In the diagram: 1. Cabin; 11. Soundproof panel; 111. Air vent; 2. Wind tunnel fan; 3. Dust removal mechanism; 31. Air inlet pipe; 32. Exhaust fan; 33. Air outlet pipe; 34. Filter element; 4. Sound system; 5. Sealing mechanism; 51. Electric actuator; 52. Push plate; 53. Inflation unit; 531. Cylinder; 532. Piston; 533. Spring; 534. Rod body; 535. Baffle; 54. Rubber plug. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0018] The terms used in this invention, such as "upper," "lower," "left," "right," "middle," and "one," are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] In the description of this specification, the references to terms such as "embodiment," "one embodiment," "some implementations," "exemplary," and "one implementation," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or implementation is included in at least one embodiment or implementation of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or implementation. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or implementations.

[0022] The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature.

[0023] Combination Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 This invention provides an acoustic environment reproduction test chamber for automobiles, comprising: Cabin 1, with a vertically installed soundproof panel 11 connected to one side of the cabin 1. The soundproof panel 11 divides the cabin 1 into a first inner cabin and a second inner cabin. The upper part of the soundproof panel 11 is provided with multiple air holes 111. Wind tunnel fan 2, the air outlet of wind tunnel fan 2 is connected to the first inner chamber; Dust removal mechanism 3 is connected to the second inner chamber so that air in the first inner chamber enters the dust removal mechanism 3 through the air hole 111 and the second inner chamber in sequence. Audio system 4, multiple audio systems 4 are connected to the inner ceiling of the first inner cabin.

[0024] Specifically, inside chamber 1, a sound insulation panel 11 is vertically installed. The sound insulation panel 11 is not completely sealed; multiple air vents 111 are opened in its upper area. Through the physical separation of the sound insulation panel 11, the internal space of chamber 1 is clearly divided into two adjacent chambers: the first inner chamber and the second inner chamber. The first inner chamber is the main testing area, used to place the test subject, while the second inner chamber serves as an airflow channel and transition area. The sound insulation panel 11 itself has good sound insulation performance, and its purpose is to establish basic acoustic isolation between the two inner chambers. The wind tunnel fan 2 is installed outside chamber 1 or in a specific air duct. Its air outlet is connected to the front or a specific position of the first inner chamber through a pipe or air duct. When the wind tunnel fan 2 is working, it continuously blows high-speed, controllable airflow into the first inner chamber. The airflow is used to simulate the airflow environment faced by a car in actual driving, especially to study the generation and characteristics of external wind noise of a car. The sound system 4 is used to play or reproduce specific acoustic environments, such as road noise, engine noise, ambient background noise, or other acoustic signals that need to be studied, into the first interior compartment.

[0025] In this optional embodiment, wind tunnel testing (simulating driving wind) and acoustic environment reproduction testing (simulating various sounds) are integrated into the same chamber 1. The dust removal mechanism 3 can remove dust and other pollutants such as particles that may fall off the vehicle itself that are stirred up by the airflow in the first inner chamber during the test, which helps to maintain the cleanliness of the test environment and reduce the long-term negative impact of dust on the acoustic test accuracy (such as contaminating sound-absorbing materials and sensors) and the vehicle test status (such as contaminating engine intake air). The design of the sound insulation panel 11 provides a relatively pure acoustic background for the first inner chamber to improve the test accuracy.

[0026] Optionally, the automotive acoustic environment reproduction test chamber also includes a sealing mechanism 5, which includes a rubber plug 54. When the dust removal mechanism 3 is not working, the rubber plug 54 is gradually inserted into the corresponding air hole 111. When the dust removal mechanism 3 is working, the rubber plug 54 is removed from the corresponding air hole 111.

[0027] In this optional embodiment, the number and arrangement of the rubber plugs 54 correspond one-to-one with the air vents 111 on the upper part of the sound insulation panel 11, and the dust removal mechanism 3 is not in operation: At this time, the test chamber may be conducting a pure acoustic reproduction test (only the sound system 4 is working), or it may be in a ready or static state, allowing the sealing mechanism 5 to control the rubber plugs 54 to gradually move towards the sound insulation panel 11, and finally insert the end of each rubber plug 54 into its corresponding air vent 111. When the dust removal mechanism 3 is in operation: When it is necessary to activate the dust removal mechanism 3 for air purification, the sealing mechanism 5 will control the rubber plugs 54 to perform the opposite movement, that is, to gradually withdraw and move them out of the air vents 111 into which they are inserted, thereby relieving the blockage of the air vents 111.

[0028] Furthermore, the sealing mechanism 5 also includes an inflation unit 53. When the rubber plug 54 is gradually inserted into the corresponding air hole 111, the inflation unit 53 gradually inflates the rubber plug 54. When the rubber plug 54 is removed from the corresponding air hole 111, the inflation unit 53 gradually evacuates the rubber plug 54.

[0029] In this optional embodiment, if the rubber plug 54 is forcibly inserted into the relatively small air hole 111 while fully inflated, it will encounter huge resistance and easily damage the rubber plug 54 or the edge of the air hole 111. The strategy adopted in this solution is to inflate it simultaneously during the insertion process. This can be understood as follows: the rubber plug 54 is initially small in diameter and slender in shape in an uninflated or low-pressure state, making it easy to align and insert into the air hole 111. While the insertion is being performed or after it has reached its position, it is then inflated to expand it, thereby tightly filling the air hole 111 and achieving a high-pressure seal. Similarly, if the rubber plug 54 is fully inflated... Directly pulling out the rubber plug while it is in an expanded, sealed state will generate significant friction and resistance due to its tight fit with the inner wall of the air hole 111, potentially damaging the rubber plug or overloading the moving mechanism. This solution involves evacuating air before or simultaneously with the removal action, causing the rubber plug 54 to contract and soften, disengaging from the inner wall of the air hole 111. This allows it to be easily and smoothly removed from the air hole 111, protecting the seal and the drive mechanism. The inflation unit 53 ensures that the rubber plug 54 reaches the optimal expansion pressure, achieving both sealing and preventing premature aging or cracking of the rubber plug due to over-inflation, resulting in a more durable and controllable sealing effect.

[0030] Optionally, the sealing mechanism 5 also includes a transverse unit, which is used to push the rubber plug 54 into the corresponding air hole 111 or to move the rubber plug 54 out of the corresponding air hole 111.

[0031] In this optional embodiment, the driving direction includes two directions: one is to push the rubber plug 54 toward the sound insulation plate 11 until it is inserted into the air hole 111; the other is to pull or push the rubber plug 54 in the opposite direction so that it is withdrawn from the air hole 111.

[0032] Furthermore, the lateral movement unit includes an electric actuator 51 and a push plate 52. The electric actuator 51 is connected to the inner wall of the second inner compartment, and the output end of the electric actuator 51 is connected to the push plate 52. Multiple rubber plugs 54 are connected to one side of the push plate 52 facing the air vent 111.

[0033] In this optional embodiment, the electric push rod 51 extends, and the telescopic rod of the electric push rod 51 pushes the push plate 52. The push plate 52 then drives all the rubber plugs 54 on it to move smoothly toward the sound insulation plate 11. During the movement or after it is in place, the inflation unit 53 works to inflate the rubber plugs 54.

[0034] Optionally, the inflation unit 53 includes a cylinder 531, a piston 532, a spring 533, a rod 534, and a baffle 535. The cylinder 531 is connected to the push plate 52. The piston 532 is slidably connected to the inner wall of the cylinder 531. One end of the rod 534 is connected to the piston 532, and the other end of the rod 534 passes through the cylinder 531 and is connected to the baffle 535. The spring 533 is sleeved on the rod 534, and the two ends of the spring 533 abut against the opposite surfaces of the baffle 535 and the cylinder 531, respectively. The push plate 52 is provided with an air passage. One end of the air passage is connected to the bottom of the inner cavity of the cylinder 531, and the other end of the air passage is connected to the rubber plug 54. The top of the inner cavity of the cylinder 531 is provided with an air hole.

[0035] In this optional embodiment, during the inflation process (when sealing): when the electric push rod 51 pushes the push plate 52 toward the sound insulation plate 11, the entire push plate 52 and its components (including the cylinder 531) move forward together. However, the baffle 535 fixed to the top of the rod 534 will remain relatively stationary in the initial stage of movement due to inertia or slight resistance, but will soon be blocked by the solid part of the sound insulation plate 11 and will not be able to continue moving forward. At this time, the push plate 52 continues to move forward under the action of the electric push rod 51, which is equivalent to the cylinder 531 moving relative to the stationary piston 532 (which is held against by the sound insulation plate 11 through the rod 534 and the baffle 535). At the same time, the spring 533 is compressed so that air is forced into the rubber plug 54 through the air passage in the push plate 52, causing it to expand and complete the inflation and sealing. During the air extraction process (when it is turned on): When the electric actuator 51 pulls the push plate 52 to return to its original position, the cylinder 531 moves backward along with the push plate 52. At this time, the baffle 535 is no longer blocked by the sound insulation plate 11. Under the restoring force of the previously compressed spring 533, the spring 533 pushes the baffle 535 and the rod 534, causing the piston 532 to move relative to the cylinder 531 (return to its original position). This negative pressure draws the air in the rubber plug 54 back through the air passage, causing it to contract and release air.

[0036] Furthermore, the inner walls of compartment 1 are covered with sound-absorbing cotton.

[0037] In this optional embodiment, the sound emitted by the speaker 4 in the first cabin and the noise radiated by the vehicle itself are absorbed, preventing the noise from reflecting multiple times between the hard walls to form a reverberant sound field, making the sound field in the test area more uniform and diffused, and the test data more representative and reliable.

[0038] Furthermore, the dust removal mechanism 3 includes an air inlet pipe 31, an induced draft fan 32, an air outlet pipe 33, and a filter unit. The induced draft fan 32 is connected to the top surface of the compartment 1. The air inlet of the induced draft fan 32 is connected to one end of the air inlet pipe 31, and the other end of the air inlet pipe 31 is connected to the inner top of the second inner compartment. The air outlet of the induced draft fan 32 is connected to the air outlet pipe 33, and the filter unit is located in the air outlet pipe 33.

[0039] In this optional embodiment, when dust removal is required, the induced draft fan 32 is activated. The induced draft fan 32 continuously draws air from the top of the second inner chamber through the air inlet pipe 31, thereby creating a negative pressure (or lower air pressure) in the second inner chamber. This causes the air in the first inner chamber to flow into the second inner chamber through the opened air hole 111 under the action of pressure difference, and is eventually drawn into the air inlet pipe 31. The air containing dust that is drawn out is sent into the air outlet pipe 33 under the pressure of the induced draft fan 32. When flowing through the air outlet pipe 33, the particulate matter in the air is intercepted and adsorbed by the filter unit therein. The purified air is then discharged from the end of the air outlet pipe 33 to the atmosphere or a designated recycling channel.

[0040] Optionally, the filter unit is configured as filter element 34, which is connected to the air outlet of the air outlet pipe 33.

[0041] In this optional embodiment, the dust-laden air discharged from the induced draft fan 32 enters the air outlet duct 33 and flows to the end filter element 34. When the air passes through the fiber layer of the filter element 34, the dust particles are captured by the fibers due to diffusion, interception, inertial collision and other effects, and adhere to the filter material. The clean air then passes through the filter element 34 and is discharged into the atmosphere.

[0042] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. An acoustic environment reproduction test chamber for automobiles, characterized by comprising: include: Cabin (1), one side of which is connected to a vertically arranged soundproof panel (11), the soundproof panel (11) divides the cabin (1) into a first inner cabin and a second inner cabin, and the upper part of the soundproof panel (11) is provided with multiple air holes (111); Wind tunnel fan (2), the air outlet of the wind tunnel fan (2) is connected to the first inner chamber; Dust removal mechanism (3) is connected to the second inner chamber so that the air in the first inner chamber enters the dust removal mechanism (3) through the air hole (111) and the second inner chamber in sequence; A speaker (4), multiple speakers (4) are connected to the inner top surface of the first inner cabin.

2. The acoustic environment reproduction test chamber for automobiles according to claim 1, characterized by The automotive acoustic environment reproduction test chamber also includes a sealing mechanism (5), which includes a rubber plug (54). When the dust removal mechanism (3) is not working, the rubber plug (54) is gradually inserted into the corresponding air hole (111). When the dust removal mechanism (3) is working, the rubber plug (54) is removed from the corresponding air hole (111).

3. The acoustic environment reproduction test chamber for automobiles according to claim 2, characterized by The sealing mechanism (5) further includes an inflation unit (53). When the rubber plug (54) is gradually inserted into the corresponding air hole (111), the inflation unit (53) gradually inflates the rubber plug (54). When the rubber plug (54) is removed from the corresponding air hole (111), the inflation unit (53) gradually evacuates the rubber plug (54).

4. The acoustic environment reproduction test chamber for automobiles according to claim 3, characterized by The sealing mechanism (5) further includes a transverse unit, which is used to push the rubber plug (54) to gradually insert into the corresponding air hole (111) or to move the rubber plug (54) out of the corresponding air hole (111).

5. The acoustic environment reproduction test chamber for automobiles according to claim 4, characterized by The lateral movement unit includes an electric push rod (51) and a push plate (52). The electric push rod (51) is connected to the inner wall of the second inner compartment. The output end of the electric push rod (51) is connected to the push plate (52). A plurality of rubber plugs (54) are connected to one side of the push plate (52) facing the air hole (111).

6. The automotive acoustic environment reproduction test chamber according to claim 5, characterized in that, The inflation unit (53) includes a cylinder (531), a piston (532), a spring (533), a rod (534), and a baffle (535). The cylinder (531) is connected to the push plate (52). The piston (532) is slidably connected to the inner wall of the cylinder (531). One end of the rod (534) is connected to the piston (532), and the other end of the rod (534) extends out of the cylinder (531) and is connected to the piston (532). The baffle (535) is connected, the spring (533) is sleeved on the rod (534), and the two ends of the spring (533) abut against the opposite surfaces of the baffle (535) and the cylinder (531). The push plate (52) is provided with an air passage. One end of the air passage is connected to the bottom of the inner cavity of the cylinder (531), and the other end of the air passage is connected to the rubber plug (54). The top of the inner cavity of the cylinder (531) is provided with an air hole.

7. The automotive acoustic environment reproduction test chamber according to claim 6, characterized in that, The inner walls of the compartment (1) are covered with sound insulation cotton.

8. The automotive acoustic environment reproduction test chamber according to claim 7, characterized in that, The dust removal mechanism (3) includes an air inlet pipe (31), an exhaust fan (32), an exhaust pipe (33), and a filter unit. The exhaust fan (32) is connected to the top surface of the compartment (1). The air inlet of the exhaust fan (32) is connected to one end of the air inlet pipe (31), and the other end of the air inlet pipe (31) is connected to the inner top of the second inner compartment. The air outlet of the exhaust fan (32) is connected to the exhaust pipe (33), and the filter unit is located in the exhaust pipe (33).

9. The automotive acoustic environment reproduction test chamber according to claim 8, characterized in that, The filtration unit is configured as a filter element (34), and the filter element (34) is connected to the air outlet of the air outlet pipe (33).

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