CN211013230U - NVH test system based on semi-anechoic chamber - Google Patents
NVH test system based on semi-anechoic chamber Download PDFInfo
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- CN211013230U CN211013230U CN201922150817.8U CN201922150817U CN211013230U CN 211013230 U CN211013230 U CN 211013230U CN 201922150817 U CN201922150817 U CN 201922150817U CN 211013230 U CN211013230 U CN 211013230U
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Abstract
The utility model relates to the technical field of vehicles, in particular to a NVH test system based on a semi-anechoic chamber, which comprises an anechoic chamber and a dynamometer room; the anechoic chamber is positioned in the dynamometer room; a test bench is arranged in the silencing chamber; the test bench is provided with tested equipment; the dynamometer room is provided with a heat exchange device, and the heat exchange device is connected with the tested equipment through a pipeline; the dynamometer room is also provided with a temperature adjusting device. Cooling the tested equipment by circulating the cooling liquid in the pipeline, so that the temperature rise of the tested equipment is not too high, and the NVH test result is more accurate; after the tested equipment is cooled, the tested equipment can run for a long time, and the test is continued after the temperature is reduced without stopping the test and the like, so that the test time is reduced, and the test efficiency is improved. The temperature adjusting device is further installed in the dynamometer room, so that the temperature of the anechoic room is kept constant, and the influence of temperature change on a test result is reduced as much as possible.
Description
Technical Field
The utility model relates to the technical field of vehicles, concretely relates to NVH test system based on semi-anechoic chamber.
Background
NVH refers to the english abbreviation for Noise, Vibration and Harshness (Noise, Vibration, Harshness). This is a comprehensive problem in measuring the quality of automobile manufacture, and it gives the automobile user the feeling of being most direct and superficial, and is one of the concerns of automobile manufacturers and component enterprises.
When the speed reducer or other tested equipment is used for NVH test, the test time is different according to the performance difference among different products, the test can be completed within several hours quickly, some of the test time needs to be tested for several days, and the test result can be influenced after the temperature is increased. If the NVH test of the speed reducer is carried out, the temperature of the speed reducer can be increased due to the friction between gears when the speed reducer operates, the test is stopped after the temperature of the speed reducer is increased, and the test is continued after the temperature is reduced, so that the time is delayed, the test time is prolonged, and the test efficiency is reduced.
Disclosure of Invention
The utility model discloses to at present by test equipment operation one end time after the temperature can rise, can influence the test result and need stop the test even and wait to continue the test after the temperature reduces, and lead to test time to reduce efficiency of software testing for a long time, provide a NVH test system based on half anechoic chamber.
In order to achieve the above purpose, the invention provides the following technical scheme:
a NVH test system based on a semi-anechoic chamber comprises an anechoic chamber and a dynamometer room; the anechoic chamber is positioned in the dynamometer chamber; a test bench is arranged in the silencing chamber; the test bench is provided with tested equipment; the dynamometer room is provided with a heat exchange device, and the heat exchange device is connected with the tested equipment through a pipeline and used for cooling the tested equipment; the dynamometer room is also provided with a temperature adjusting device, and the temperature adjusting device is connected with the anechoic chamber through a pipeline and used for adjusting the temperature of the anechoic chamber.
Preferably, a first loading machine and a second loading machine are oppositely arranged in the dynamometer chambers on the two sides of the anechoic chamber; the first loading machine is connected with a first transmission shaft, the second loading machine is connected with a second transmission shaft, and the wall surface of the anechoic chamber is provided with an opening; the first transmission shaft and the second transmission shaft penetrate through the opening to be connected with the tested equipment; a driving motor is arranged beside the test bench in the silencing chamber; the device to be tested is provided with a vibration sensor, and a microphone sensor is arranged around the test bench; an operation table is arranged outside the dynamometer, and the operation table is electrically connected with the driving motor. The first loading machine and the second loading machine form loads on the tested equipment, and the first loading machine and the second loading machine are installed outside the silencing chamber, so that the interference of vibration and noise generated when the first loading machine and the second loading machine operate on the tested equipment is reduced as much as possible, and the test result is more accurate. Arranging a vibration sensor on a shell at the position where a bearing is arranged at the input end and the output end of the shell of the tested speed reducer; and mounting a microphone sensor on the periphery of the test bench, and acquiring data through the vibration sensor and the microphone sensor.
Preferably, the first transmission shaft and the second transmission shaft are coaxially arranged. The first transmission shaft and the second transmission shaft are coaxially arranged, so that the first transmission shaft and the second transmission shaft do not move too tightly.
Preferably, sound-absorbing materials are arranged on the four walls of the anechoic chamber and the inner side of the roof, and the sound-absorbing materials are foam or soundproof cotton. The sound-absorbing materials are laid on the inner sides of the wall surface and the roof of the anechoic chamber, so that the sound in the anechoic chamber is only the sound emitted by the test equipment as far as possible, the external interference is reduced, and the test result is more accurate.
Preferably, the gap between the wall surface of the anechoic chamber and the wall surface is sealed by foam. The joint of each wall is plugged by foam, so that the sound insulation effect of the anechoic chamber is better.
Preferably, the first transmission shaft with the parcel has soundproof cotton on the second transmission shaft, rubber packing ring is installed to trompil department, rubber packing ring with first transmission shaft with all leave the space between the second transmission shaft. All wrap up soundproof cotton on first transmission shaft and secondary drive axle, reduce first transmission shaft and secondary drive axle and rotate the influence of the sound that the process was sent to NVH test result to install the rubber packing ring in trompil department, avoid sound to spread into from the trompil department, but first transmission shaft, secondary drive axle and rubber packing ring leave the clearance and avoid influencing first transmission shaft and secondary drive axle rotation.
Preferably, the anechoic chamber is a cuboid, and the test bench is covered with a sound absorption material. The test bench frame is covered with the sound absorption material, so that the test bench frame is prevented from shaking to influence a test result when the tested equipment runs.
Compared with the prior art, the invention has the beneficial effects that: according to the NVH test system, the heat exchange device is arranged in the dynamometer room, and the temperature of the tested equipment is reduced through circulation of cooling liquid in a pipeline, so that the temperature rise of the tested equipment is not too high, and the NVH test result is more accurate; and after the tested equipment is cooled by the cooling liquid, the tested equipment can run for a long time, and the test is continued after the temperature is reduced without stopping the test and the like, so that the test time is reduced, and the test efficiency is improved. The temperature adjusting device is further installed in the dynamometer room, so that the temperature of the anechoic room is kept constant, and the influence of temperature change on a test result is reduced as much as possible.
Description of the drawings:
fig. 1 is a top view of a semi-anechoic chamber-based NVH testing system provided herein.
The labels in the figure are: the test system comprises a sound absorption chamber 1, a dynamometer chamber 2, a test bench 3, a tested device 4, a heat exchange device 5, a temperature adjusting device 6, a first loading machine 7, a second loading machine 8, a first transmission shaft 9, a second transmission shaft 10, a vibration sensor 11, a microphone sensor 12 and an operation table 13.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
As shown in fig. 1, the present application provides a semi-anechoic chamber based NVH testing system, comprising an anechoic chamber 1 and a dynamometer chamber 2; the anechoic chamber 1 is positioned in the dynamometer room 2. A test bench 3 is arranged in the anechoic chamber 1; the test bench 3 is provided with a device 4 to be tested. The test bench 3 adopts an electric closed test bench, can realize various test working conditions such as forward, reverse, forward dragging and reverse dragging, and can ensure that the control precision is high enough by adopting the drive control of the servo motor.
The driving motor is installed beside the test bench 3, so that the NVH test result of the tested equipment 4 is prevented from being influenced, the driving motor is wrapped by a noise elimination material, or the driving equipment is placed in a shell with a good sound insulation effect, and a driving shaft of the driving motor is connected with the tested equipment 4. After the device 4 under test is mounted on the test stage 3, the vibration sensor 11 is disposed on the housing at the input/output end mounting bearing of the device 4 under test, and the microphone sensors 12 are mounted on the front, rear, left, and right sides of the test stage 3, the microphone sensors 12 being about 10cm from the housing of the device 4 under test.
The dynamometer room 2 is provided with a heat exchange device 5, and the heat exchange device 5 is connected with the tested equipment 4 through a pipeline and used for cooling the tested equipment 4; the dynamometer room 2 is further provided with a temperature adjusting device 6, and the temperature adjusting device 6 is connected with the anechoic chamber 1 through a pipeline and used for adjusting the temperature of the anechoic chamber 1. A first loader 7 and a second loader 8 are arranged in the dynamometer room 2 on two sides of the anechoic chamber 1 oppositely; the first loader 7 is connected with a first transmission shaft 9, and the second loader 8 is connected with a second transmission shaft 10; the first transmission shaft 9 and the second transmission shaft 10 are coaxially arranged, that is, the first transmission shaft 9 and the second transmission shaft 10 are on the same horizontal line. The wall surface of the anechoic chamber 1 is provided with an opening; the first transmission shaft 9 and the second transmission shaft 10 are connected with the tested equipment 4 through the openings; a driving motor is arranged beside the test bench 3 in the anechoic chamber 1; the device under test 4 is provided with a vibration sensor 11, and a microphone sensor 12 is arranged around the test bench 3.
An operation table 13 is installed outside the dynamometer room 2, and the operation table 13 is electrically connected with the driving motor. The test bench 3 can realize various test working conditions such as forward, reverse, forward dragging, reverse dragging and the like through the operating platform 13.
Transmission shaft bases are installed on two sides of the test bench 3, iron plates are installed on the bases of the transmission shafts, a concrete bottom plate below the iron plates is subjected to vibration isolation treatment by damping between the iron plates and concrete, external interference is avoided, and meanwhile, the influence of vibration of a test piece and the bench on other test results through ground transmission is avoided.
The inner sides of the four walls and the roof of the anechoic chamber 1 are provided with sound-absorbing materials which are foam or soundproof cotton. And a gap between the wall surface of the anechoic chamber 1 and the wall surface is sealed by foam. First transmission shaft 9 with the parcel has the soundproof cotton on the second transmission shaft 10, rubber packing ring is installed to trompil department, rubber packing ring with first transmission shaft 9 with all leave the space between the second transmission shaft 10. The anechoic chamber 1 is a cuboid, and the test bench 3 is covered with a sound absorption material.
The test process of the NVH test system based on the semi-anechoic chamber provided by the invention is as follows:
firstly, the device 4 to be tested is arranged on the test bench 3 and fixedly connected by bolts.
Secondly, arranging the microphone sensors 12 in the front, rear, left and upper directions of the tested piece according to the test requirements, and arranging the vibration sensors 11 on the shell of the input and output ends of the tested device 4 at the positions 10cm away from the shell of the tested device 4.
And thirdly, the installer withdraws from the anechoic chamber 1, closes the door of the anechoic chamber 1 and the door of the dynamometer machine room 2, starts the test bench 3 through the operation table 13, performs a speed-up test or a steady test, and sets the rotating speed torque of the motor of the test bench 3 according to the test requirements.
And fourthly, starting the acquisition equipment after the rotating speed and the torque reach the set working condition, and starting to acquire data.
And fifthly, after the data acquisition is finished, stopping the acquisition equipment, stopping the test bench 3, and performing the next test round according to the test outline or stopping the test bench 3.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A NVH test system based on a semi-anechoic chamber is characterized by comprising an anechoic chamber (1) and a dynamometer room (2); the anechoic chamber (1) is positioned in the dynamometer room (2); a test bench (3) is arranged in the anechoic chamber (1); the test bench (3) is provided with a device to be tested (4); the dynamometer room (2) is provided with a heat exchange device (5), and the heat exchange device (5) is connected with the tested equipment (4) through a pipeline and used for cooling the tested equipment (4); the dynamometer room (2) is further provided with a temperature adjusting device (6), and the temperature adjusting device (6) is connected with the anechoic chamber (1) through a pipeline and used for adjusting the temperature of the anechoic chamber (1).
2. The semi-anechoic chamber-based NVH testing system according to claim 1, wherein a first loader (7) and a second loader (8) are oppositely arranged in the dynamometer room (2) at two sides of the anechoic chamber (1); a first transmission shaft (9) is connected to the first loading machine (7), a second transmission shaft (10) is connected to the second loading machine (8), and an opening is formed in the wall surface of the anechoic chamber (1); the first transmission shaft (9) and the second transmission shaft (10) are connected with the tested equipment (4) through the opening; a driving motor is arranged beside the test bench (3) in the anechoic chamber (1); a vibration sensor (11) is arranged on the tested device (4), and a microphone sensor (12) is arranged around the test bench (3); an operation panel (13) is installed outside the dynamometer room (2), and the operation panel (13) is electrically connected with the driving motor.
3. The semi-anechoic chamber-based NVH testing system of claim 2, wherein the first drive shaft (9) and the second drive shaft (10) are coaxially disposed.
4. The semi-anechoic chamber-based NVH testing system of claim 2, wherein the four walls of the anechoic chamber (1) and the inner side of the roof are provided with sound absorbing materials, and the sound absorbing materials are foam or soundproof cotton.
5. The NVH test system based on the semi-anechoic chamber is characterized in that a gap between the wall surface of the anechoic chamber (1) and the wall surface is sealed by foam.
6. The semi-anechoic chamber-based NVH testing system according to claim 5, wherein the first transmission shaft (9) and the second transmission shaft (10) are wrapped with soundproof cotton, rubber gaskets are mounted at the openings, and gaps are reserved between the rubber gaskets and the first transmission shaft (9) and the second transmission shaft (10).
7. The semi-anechoic chamber-based NVH testing system of claim 2, wherein the anechoic chamber (1) is a cuboid and the test bench (3) is covered with a sound absorbing material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922150817.8U CN211013230U (en) | 2019-12-04 | 2019-12-04 | NVH test system based on semi-anechoic chamber |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922150817.8U CN211013230U (en) | 2019-12-04 | 2019-12-04 | NVH test system based on semi-anechoic chamber |
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| CN211013230U true CN211013230U (en) | 2020-07-14 |
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| CN201922150817.8U Active CN211013230U (en) | 2019-12-04 | 2019-12-04 | NVH test system based on semi-anechoic chamber |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113820137A (en) * | 2021-08-19 | 2021-12-21 | 安庆中船柴油机有限公司 | NVH (noise, vibration and harshness) processing device and method for marine diesel engine |
| CN114112436A (en) * | 2021-11-26 | 2022-03-01 | 重庆理工大学 | Off-line type NVH (noise, vibration and harshness) evaluation system and evaluation method for electric drive assembly |
| CN114115200A (en) * | 2021-11-26 | 2022-03-01 | 重庆理工大学 | NVH (noise, vibration and harshness) testing system and NVH testing method for electric automobile electric drive assembly |
-
2019
- 2019-12-04 CN CN201922150817.8U patent/CN211013230U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113820137A (en) * | 2021-08-19 | 2021-12-21 | 安庆中船柴油机有限公司 | NVH (noise, vibration and harshness) processing device and method for marine diesel engine |
| CN113820137B (en) * | 2021-08-19 | 2024-04-19 | 安庆中船柴油机有限公司 | NVH (noise, vibration and harshness) processing device and method for marine diesel engine |
| CN114112436A (en) * | 2021-11-26 | 2022-03-01 | 重庆理工大学 | Off-line type NVH (noise, vibration and harshness) evaluation system and evaluation method for electric drive assembly |
| CN114115200A (en) * | 2021-11-26 | 2022-03-01 | 重庆理工大学 | NVH (noise, vibration and harshness) testing system and NVH testing method for electric automobile electric drive assembly |
| CN114115200B (en) * | 2021-11-26 | 2023-09-08 | 重庆理工大学 | NVH (noise and harshness) testing system and testing method for electric drive assembly of electric automobile |
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