Static test experiment cabin for automobile NVH performance

Abstract

The invention discloses an automobile NVH performance static test experiment cabin, which comprises a cabin chamber and a sound box, a lantern ring, a lifting mechanism and a rotating mechanism are arranged in the cabin chamber, the sound box is arranged at one end of the inner side of the lantern ring, and the lifting mechanism and the rotating mechanism respectively carry out lifting and rotating adjustment on the sound box through the lantern ring; the lifting mechanism comprises a plurality of supporting cylinders and supporting rods, the supporting cylinders are arranged outside the bottom ends of the supporting rods in a sleeving mode, the lifting mechanism adjusts the height of the lantern ring through stretching and retracting of the supporting cylinders and the supporting rods, the rotating mechanism comprises a driving assembly and a lubricating assembly, and the lubricating assembly comprises an oil tank, a cotton piece and a cotton swab. The cotton piece and the cotton swab lubricate the driving assembly through lubricating oil guided out of the oil tank, and the driving assembly is used for rotation adjustment of the lantern ring. When the automobile is in the cabin, the relative position of the sound equipment and the automobile can be adjusted by controlling the lifting and rotation of the lantern ring, so that sound sources in different heights and directions are set, and the static sound insulation test of the automobile at multiple angles is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of static testing of automobile NVH performance, and in particular to a static testing chamber for automobile NVH performance. Background Art

[0002] NVH is the abbreviation of three English words: Noise, Vibration and Harshness. The noise mainly includes powertrain noise, road noise, wind noise and accessory noise inside the car, as well as acceleration noise and warning sound outside the car.

[0003] NVH performance is one of the most important performance indicators of a car. The NVH performance verification of the whole vehicle includes static testing and dynamic testing; static testing includes static sound insulation testing, static vibration testing and static comfort testing; among them, the static sound insulation test mainly focuses on the noise level in the car and the spectrum distribution of the noise. This test is usually carried out when the vehicle is stationary. The purpose is to evaluate the total level of noise in the car and the noise level in different frequency ranges.

[0004] The static sound insulation test of a vehicle is generally carried out in a professional anechoic chamber, which is equipped with a standard sound source to generate noise in different frequency ranges. Then, an acoustic microphone is installed on the headrest of the seat in the vehicle to record the noise level in the vehicle at various test points. The standard sound source in this operation is usually a speaker supported by a bracket. When adjusting the distance between it and the vehicle, it often needs to be moved manually. Therefore, it is more troublesome to adjust the relative position between the sound source and the vehicle, which leads to inconvenience in the static sound insulation test process of the vehicle at multiple angles, which is not conducive to the smooth progress of the test experiment. Summary of the invention

[0005] In view of the above-mentioned prior art, the present invention provides a static test chamber for testing the NVH performance of an automobile, and the main technical problem to be solved is how to conveniently adjust the relative position between the sound source and the vehicle.

[0006] To achieve the above object, the technical solution of the embodiment of the present invention is implemented as follows:

[0007] A static test chamber for automobile NVH performance includes a chamber and a sound system. A collar, a lifting mechanism and a rotating mechanism are arranged in the chamber. The sound system is arranged at one end of the inner side of the collar. The lifting mechanism and the rotating mechanism respectively lift and rotate the sound system through the collar.

[0008] The lifting mechanism includes a plurality of support tubes and support rods. The support tubes are sleeved on the outside of the bottom ends of the support rods, and the lifting mechanism adjusts the height of the sleeve ring by extending and retracting the support tubes and the support rods. The rotating mechanism includes a driving assembly and a lubricating assembly. The lubricating assembly includes an oil tank, cotton pads and cotton swabs. The cotton pads and cotton swabs lubricate the driving assembly by exporting the lubricating oil in the oil tank. The driving assembly is used for adjusting the rotation of the sleeve ring.

[0009] Furthermore, several support tubes are equidistantly fixedly connected to the outer side of the bottom inner wall of the chamber, and the bottom inner wall of the support tube is fixedly connected to a first motor, the top end of the output shaft of the first motor is fixedly connected to a threaded rod, a threaded groove is opened on the inner side of the support rod, the threaded rod is threadedly connected to the support rod at the threaded groove, and both the support tube and the support rod are elliptical cylinders.

[0010] Furthermore, a fixing ring is fixedly connected to the outer top end of the ring, and a chassis is provided at the outer bottom end of the ring. Several circular openings are provided on the outer sides of the fixing ring and the chassis. A connecting shaft is fixedly connected to the fixing ring and the chassis at the circular openings, and the ball is rotatably connected to the outside of the ball.

[0011] Furthermore, a pillar is fixedly connected to the top of one side of the support rod close to the sleeve, one end of the pillar extends to between the fixed ring and the chassis, a circular through hole is opened on one side of the pillar, and the pillar is rotatably connected to a rotating rod at the circular through hole, and the driving assembly includes a second motor arranged inside the pillar, the output shaft of the second motor is fixedly connected to one end of the rotating rod inside the pillar, and the top and bottom ends of the pillar are both provided with slideways adapted to the ball bearings.

[0012] Furthermore, one end of the rotating rod outside the pillar is connected to a gear through a key, and the inner side of the top of the chassis is connected to an end face toothed disc through a key, the gear is meshed with the end face toothed disc, an oil hole is opened on the top of the gear, and a cotton swab is provided at the oil hole of the fixed ring, a sponge block is fixedly connected to the outside of the bottom end of the cotton swab at the fixed ring, and a cotton piece is fixedly connected to the outside of the ball at the top of the fixed ring, and the top of the fixed ring is fixedly connected to the same oil tank at the outside of the cotton swab and the cotton piece.

[0013] Furthermore, a bracket and a connecting rod are rotatably connected at one end of the inner side of the ring, and the speaker is rotatably connected at one end of the bracket and the connecting rod. The bracket includes a fixing rod and a fixing tube. A rectangular opening is opened on one side of the fixing tube, and the fixing tube is slidably connected to a fixing plate at the rectangular opening. The fixing rod is fixedly connected to the sheet body of the fixing plate outside the fixing tube.

[0014] Furthermore, a third motor is fixedly connected to the inner wall of one side of the ring, a reciprocating screw is fixedly connected to one end of the output shaft of the third motor, a nut is connected to the external thread of the reciprocating screw, a fixed plate is fixedly connected to one side of the nut, and a guide groove is provided on the other side of the nut, a guide rail is fixedly connected to the inner wall of one side of the fixed cylinder, and the nut is slidably connected to the guide rail at the guide groove.

[0015] Furthermore, a fixing ring is provided at the inner bottom end of the collar, a plurality of mounting holes are equidistantly provided on the ring body of the fixing ring, and bolts are provided at the mounting holes, a plurality of threaded grooves are equidistantly provided at the inner bottom end of the collar, the number of the bolts and the threaded grooves are the same and correspond one to one, the bolts are threadedly connected to the collar at the threaded grooves, and the chassis is fixedly connected to the outer bottom end of the fixing ring.

[0016] The beneficial effects of the present invention are:

[0017] 1. When the car is in the compartment, the relative position between the sound system and the car can be adjusted by controlling the lifting and rotation of the collar, so as to set the sound sources at different heights and directions, so as to facilitate the static sound insulation test of the vehicle at multiple angles; and in the process of adjusting the rotation of the collar, the lubricating oil in the oil tank can be transferred to the ball and gear respectively by using cotton sheets and cotton swabs, so as to reduce the transmission friction between the parts, ensure the quietness of the above-mentioned rotation adjustment process, and thus avoid generating additional noise that affects the test results;

[0018] 2. By setting a reciprocating screw, the fixed rod can be driven to move back and forth by its rotation, so as to push and pull the sound to make it swing. By the rotation of the swing ring, the sound can continue to swing during the rotation process, so that the noise source can produce dynamic changes, thereby further ensuring the reliability of the static sound insulation test results of the vehicle;

[0019] 3. By setting a fixing ring to disassemble and assemble the chassis, the sleeve ring can be easily disassembled so that the transmission parts such as the end gear, gear and ball bearing can be exposed. In this case, it will be convenient to clean and maintain the above parts, avoiding the accumulation of oil or debris on the surface and causing poor transmission, thus ensuring smooth and quiet transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A cross-sectional view of a static test chamber for automobile NVH performance in Example 1 of the present application;

[0021] Figure 2 This is a front cross-sectional view of a lifting mechanism and a rotating mechanism of a static test chamber for automobile NVH performance in Example 1 of the present application;

[0022] Figure 3 for Figure 2 A magnified view of part A;

[0023] Figure 4 A top view of a support mechanism of a static test chamber for testing automobile NVH performance in Example 1 of the present application;

[0024] Figure 5 This is a top cross-sectional view of a fixing cylinder of a static test chamber for automobile NVH performance in Example 1 of the present application;

[0025] Figure 6 This is a front cross-sectional view of the rotating mechanism of a static test chamber for testing the NVH performance of an automobile in Example 2 of the present application.

[0026] Description of Figure Numbers:

[0027] Chamber 1, support tube 2, support rod 3, pillar 4, bracket 5, fixing rod 501, fixing tube 502, collar 6, speaker 7, fixing ring 8, connecting rod 9, first motor 10, threaded rod 11, second motor 12, oil tank 13, cotton piece 14, cotton swab 15, sponge block 16, rotating rod 17, gear 18, end face gear disc 19, chassis 20, connecting shaft 21, ball 22, nut 23, guide rail 24, reciprocating screw 25, third motor 26, fixing plate 27, fixing ring 28, bolt 29. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further elaborated in detail below in conjunction with the drawings and specific embodiments of the specification. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. In the following description, the expression "some embodiments" is related to a subset of all possible embodiments, but it should be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments, and can be combined with each other without conflict.

[0029] It should also be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "inside", "outside", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0030] Example 1

[0031] See attached Figure 1-5The present application provides a static test chamber for automobile NVH performance, including a chamber 1 and a sound system 7. The chamber 1 is a anechoic chamber, and a collar 6, a lifting mechanism and a rotating mechanism are provided in the chamber 1. The sound system 7 is arranged at one end of the inner side of the collar 6. The lifting mechanism and the rotating mechanism respectively lift and rotate the sound system 7 through the collar 6.

[0032] The lifting mechanism includes a plurality of support tubes 2 and support rods 3. The support tube 2 is sleeved on the outside of the bottom end of the support rod 3, and the lifting mechanism adjusts the height of the collar 6 by telescoping the support tube 2 and the support rod 3. The rotating mechanism includes a driving assembly and a lubricating assembly. The lubricating assembly includes an oil tank 13, a cotton sheet 14 and a cotton swab 15. The cotton sheet 14 and the cotton swab 15 lubricate the driving assembly by exporting the lubricating oil in the oil tank 13. The driving assembly is used for rotating and adjusting the collar 6. The inner wall of the support tube 2 is soundproofed with sound insulation material to avoid excessive noise generated during the telescopic adjustment process of the support tube 2 and the support rod 3.

[0033] When conducting a static sound insulation test on a vehicle, the vehicle can be parked in the compartment 1, and then an acoustic microphone can be installed on the headrest of the seat in the vehicle, and then the door of the compartment 1 can be closed;

[0034] During the test, the height, position and direction of the speaker 7 can be adjusted first, and then it can be started to simulate the noise. At this time, the acoustic microphone in the car can be used to measure the noise conditions in the car. After that, the measured data can be compared with the noise data generated by the speaker 7 to obtain the results of the static sound insulation test of the vehicle.

[0035] Preferably, several support tubes 2 are equidistantly fixedly connected to the outer side of the bottom inner wall of the chamber 1, and the bottom inner wall of the support tube 2 is fixedly connected to a first motor 10, the top end of the output shaft of the first motor 10 is fixedly connected to a threaded rod 11, a threaded groove is opened on the inner side of the support rod 3, the threaded rod 11 is threadedly connected to the support rod 3 at the threaded groove, and the support tube 2 and the support rod 3 are both elliptical cylinders.

[0036] During the test, the first motor 10 can be started first. The first motor 10 can drive the threaded rod 11 to rotate to move the support rod 3 in the vertical direction. The support rod 3 drives the ring 6 to move through the support 4, so that the height of the speaker 7 can be adjusted, so that the speaker 7 can be adapted to vehicles of different heights.

[0037] Preferably, a fixing ring 8 is fixedly connected to the top of the outer side of the collar 6, and a chassis 20 is provided at the bottom of the outer side of the collar 6. Several circular openings are opened on the outer sides of the fixing ring 8 and the chassis 20. The fixing ring 8 and the chassis 20 are fixedly connected with a connecting shaft 21 at the circular opening. The outer side of the ball 22 is rotatably connected with the ball 22. Under the gravity of the collar 6, the fixing ring 8 will have a greater squeezing effect on the pillar 4 than the chassis 20. Therefore, the function of the ball 22 on the fixing ring 8 tends to reduce friction, while the function of the ball 22 on the chassis 20 tends to limit. Therefore, when lubricating, the lubrication effect of the ball 22 on the fixing ring 8 can be emphasized, and the lubrication of the ball 22 on the chassis 20 can be achieved by applying grease to its surface during regular maintenance of the device.

[0038] Preferably, the top of the support rod 3 near the collar 6 is fixedly connected with the pillar 4, one end of the pillar 4 extends to between the fixing ring 8 and the chassis 20, a circular through hole is provided at one side of the pillar 4, and the pillar 4 is rotatably connected with the rotating rod 17 at the circular through hole, the driving assembly includes a second motor 12 arranged inside the pillar 4, the output shaft of the second motor 12 is fixedly connected with one end of the rotating rod 17 inside the pillar 4, and the top and bottom ends of the pillar 4 are both provided with slideways adapted to the ball bearings 22. The end of the rotating rod 17 outside the pillar 4 is connected with a gear 18 through a key, and the inner side of the top of the chassis 20 is connected with an end face toothed disc 19 through a key, and the gear 18 is meshed with the end face toothed disc 19.

[0039] Secondly, the second motor 12 can be started, and the second motor 12 can drive the gear 18 to rotate through the rotating rod 17. The gear 18 drives the chassis 20 to rotate through the end face gear plate 19. The chassis 20 can drive the audio 7 to rotate through the ring 6, so as to adjust its relative position with the car.

[0040] Preferably, the fixing ring 8 is provided with an oil hole above the gear 18, and the fixing ring 8 is provided with a cotton swab 15 at the oil hole, and the fixing ring 8 is fixedly connected with a sponge block 16 at the outside of the bottom end of the cotton swab 15, and the upper and lower parts of the sponge block 16 are respectively wrapped around the outside of the bottom end of the cotton swab 15 and the outside of the top end of the gear 18, so that the lubricating oil on the cotton swab 15 can be applied to the gear 18, and the gear 18 will not contact the cotton swab 15 and cause it to loosen during rotation, and the top end of the fixing ring 8 is fixedly connected with a cotton piece 14 at the outside of the ball 22, and the top end of the fixing ring 8 is fixedly connected with the same oil tank 13 at the outside of the cotton swab 15 and the cotton piece 14, the oil tank 13 is annular and covers the outside of all the cotton pieces 14 and the cotton swab 15, and the top of the oil tank 13 is provided with an oil filling port, and the oil tank 13 is provided with a sealing plug at the oil filling port.

[0041] During the rotation adjustment process of the above-mentioned speaker 7, the ball bearings 22 on the fixing ring 8 and the chassis 20 can respectively replace the other two to contact with the pillar 4, so as to reduce the friction and noise generated during the adjustment process; in addition, during the movement of the sleeve ring 6, the cotton piece 14 and the cotton swab 15 will respectively apply the lubricating oil in the oil tank 13 to the ball bearings 22 and the gear 18, so as to lubricate the parts, making the above-mentioned transmission process smoother and further avoiding the generation of friction and noise.

[0042] Preferably, the inner end of the ring 6 is rotatably connected to the bracket 5 and the connecting rod 9, the speaker 7 is rotatably connected to the bracket 5 and one end of the connecting rod 9, the bracket 5 includes a fixing rod 501 and a fixing tube 502, a rectangular opening is opened on one side of the fixing tube 502, and the fixing tube 502 is slidably connected to a fixing plate 27 at the rectangular opening, and the fixing rod 501 is fixedly connected to the fixing plate 27 on the sheet body outside the fixing tube 502.

[0043] Then, the third motor 26 can be started, and the third motor 26 can drive the reciprocating screw 25 to rotate to move the nut 23 in the horizontal direction. The nut 23 drives the fixing rod 501 to move through the fixing ring 27, and the fixing rod 501 can push or pull the speaker 7 to adjust its direction.

[0044] Preferably, a third motor 26 is fixedly connected to the inner wall of one side of the sleeve 6, a reciprocating screw 25 is fixedly connected to one end of the output shaft of the third motor 26, the external thread of the reciprocating screw 25 is connected to the nut 23, a fixing plate 27 is fixedly connected to one side of the nut 23, and a guide groove is provided on the other side of the nut 23, a guide rail 24 is fixedly connected to the inner wall of one side of the fixing cylinder 502, and the nut 23 is slidably connected to the guide rail 24 at the guide groove.

[0045] During the test, the second motor 12 and the third motor 26 can be turned on at the same time. The second motor 12 can drive the ring 6 to drive the speaker 7 to rotate continuously, and the third motor 26 can drive the speaker 7 to deflect continuously. Therefore, it is possible to simulate the noise with dynamically changing position and direction, so as to conduct a more comprehensive static sound insulation test of the car.

[0046] Example 2

[0047] See attached Figure 5-6The present application provides a static test chamber for automobile NVH performance. Compared with Example 1, in order to maintain the smoothness and quietness of the speaker 7 when the position is adjusted, a fixing ring 28 is provided at the inner bottom end of the collar 6, and a plurality of mounting holes are equidistantly provided on the ring body of the fixing ring 28, and bolts 29 are provided at the mounting holes of the fixing ring 28. A plurality of threaded grooves are equidistantly provided at the inner bottom end of the collar 6, and the number of the bolts 29 and the threaded grooves is the same and corresponds one to one. The bolts 29 are threadedly connected to the collar 6 at the threaded grooves, and the chassis 20 is fixedly connected to the outer bottom end of the fixing ring 28.

[0048] After the device has been used for a certain period of time, the fixing ring 27 can be removed by dismantling the bolts 28. At this time, the chassis 20 will be separated from the collar 6, so the collar 6 can also be removed. At this time, the transmission components such as the gear 18, the end face toothed disc 19 and the ball 22 can be exposed to the outside, so it is convenient to clean the above components and prevent excessive oil or debris from accumulating on the surface to cause poor transmission, thereby maintaining the smoothness and quietness of the speaker 7 when adjusting the position.

[0049] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. The protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A static test chamber for automobile NVH performance, comprising a chamber (1) and a sound system (7), characterized in that: The chamber (1) is provided with a collar (6), a lifting mechanism and a rotating mechanism, the speaker (7) is arranged at one end of the inner side of the collar (6), and the lifting mechanism and the rotating mechanism respectively perform lifting and rotating adjustment on the speaker (7) through the collar (6); The lifting mechanism comprises a plurality of support tubes (2) and support rods (3), wherein the support tube (2) is sleeved on the outside of the bottom end of the support rod (3), and the lifting mechanism adjusts the height of the collar (6) by telescoping the support tube (2) and the support rod (3). The rotating mechanism comprises a driving assembly and a lubricating assembly, wherein the lubricating assembly comprises an oil tank (13), a cotton sheet (14) and a cotton swab (15), and the cotton sheet (14) and the cotton swab (15) lubricate the driving assembly by guiding the lubricating oil in the oil tank (13). The driving assembly is used for adjusting the rotation of the collar (6).

2. A static test chamber for automobile NVH performance according to claim 1, characterized in that: A plurality of the support tubes (2) are fixedly connected at equal distances to the outer side of the inner wall at the bottom end of the chamber (1), and a first motor (10) is fixedly connected to the inner wall at the bottom end of the support tube (2), a threaded rod (11) is fixedly connected to the top end of the output shaft of the first motor (10), a threaded groove is provided on the inner side of the support rod (3), and the threaded rod (11) is threadedly connected to the support rod (3) at the threaded groove, and the support tube (2) and the support rod (3) are both elliptical cylinders.

3. A static test chamber for automobile NVH performance according to claim 2, characterized in that: The outer top end of the collar (6) is fixedly connected to a fixing ring (8), and the outer bottom end of the collar (6) is provided with a chassis (20). The outer sides of the fixing ring (8) and the chassis (20) are both provided with a plurality of circular openings. The fixing ring (8) and the chassis (20) are fixedly connected to a connecting shaft (21) at the circular openings. The outer side of the ball (22) is rotatably connected to the ball (22).

4. The static test chamber for automobile NVH performance according to claim 3, characterized in that: The top end of the support rod (3) near the sleeve ring (6) is fixedly connected to a pillar (4), one end of the pillar (4) extends to between the fixing ring (8) and the chassis (20), a circular through hole is provided on one side of the pillar (4), and the pillar (4) is rotatably connected to a rotating rod (17) at the circular through hole, the driving assembly comprises a second motor (12) arranged inside the pillar (4), the output shaft of the second motor (12) is fixedly connected to one end of the rotating rod (17) inside the pillar (4), and the top and bottom ends of the pillar (4) are both provided with slideways adapted to the ball bearing (22).

5. The static test chamber for automobile NVH performance according to claim 4, characterized in that: The rotating rod (17) is connected to a gear (18) at one end outside the pillar (4) through a key, and the inner side of the top end of the chassis (20) is connected to an end face toothed disc (19) through a key, and the gear (18) is meshed with the end face toothed disc (19). The fixing ring (8) is provided with an oil hole above the gear (18), and a cotton swab (15) is provided at the oil hole of the fixing ring (8). The fixing ring (8) is fixedly connected to a sponge block (16) at the outside of the bottom end of the cotton swab (15), and the top end of the fixing ring (8) is fixedly connected to a cotton sheet (14) at the outside of the ball (22), and the top end of the fixing ring (8) is fixedly connected to the same oil tank (13) at the outside of the cotton swab (15) and the cotton sheet (14).

6. The static test chamber for automobile NVH performance according to claim 1, characterized in that: A bracket (5) and a connecting rod (9) are rotatably connected at one end of the inner side of the sleeve ring (6); the speaker (7) is rotatably connected to the bracket (5) and one end of the connecting rod (9); the bracket (5) comprises a fixing rod (501) and a fixing tube (502); a rectangular opening is provided on one side of the fixing tube (502); and a fixing plate (27) is slidably connected to the fixing plate (27) at the rectangular opening; the fixing rod (501) is fixedly connected to a plate body of the fixing plate (27) outside the fixing tube (502).

7. The static test chamber for automobile NVH performance according to claim 6, characterized in that: A third motor (26) is fixedly connected to the inner wall of one side of the collar (6); one end of the output shaft of the third motor (26) is fixedly connected to a reciprocating screw (25); the external thread of the reciprocating screw (25) is connected to a nut (23); the fixing plate (27) is fixedly connected to one side of the nut (23); and a guide groove is provided on the other side of the nut (23); a guide rail (24) is fixedly connected to the inner wall of one side of the fixing cylinder (502); and the nut (23) is slidably connected to the guide rail (24) at the guide groove.

8. The static test chamber for automobile NVH performance according to claim 1, characterized in that: A fixing ring (28) is provided at the inner bottom end of the collar (6), a plurality of mounting holes are equidistantly provided on the ring body of the fixing ring (28), and bolts (29) are provided at the mounting holes of the fixing ring (28). A plurality of thread grooves are equidistantly provided at the inner bottom end of the collar (6), the number of the bolts (29) being the same as the number of the thread grooves and corresponding to each other, the bolts (29) being threadedly connected to the collar (6) at the thread grooves, and the chassis (20) is fixedly connected to the outer bottom end of the fixing ring (28).

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