Passenger car air inlet system silencer performance test equipment

Abstract

The utility model belongs to the technical field of silencer testing, and particularly relates to passenger car air inlet system silencer performance testing equipment which comprises a cabinet body, and a sound source input pipeline and a sound source output pipeline are arranged on the two sides of the cabinet body respectively. The interior of the cabinet body is filled with a sound absorbing material, the middle part of the cabinet body is provided with a to-be-tested air inlet silencer, and the to-be-tested air inlet silencer is arranged between the sound source input pipeline and the sound source output pipeline; the end, located outside the cabinet body, of the sound source input pipeline is provided with a port cover, and the end, close to the to-be-tested air inlet silencer, of the sound source input pipeline is provided with at least one sound source device. The test equipment provided by the utility model is filled with the attraction material, and the port cover is arranged on the sound source input pipeline, so that external noise can be effectively isolated, and the test effect is ensured; and the testing equipment is simple and small in structure, low in manufacturing cost and convenient to operate.

Description

Technical Field

[0001] The utility model belongs to the technical field of muffler testing, in particular to a performance testing device for a muffler of an air intake system of a bus. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] Intake and exhaust noise are key design parameters for bus NVH (Noise, Vibration, Harshness). Exhaust noise is controlled by post-processors, while intake noise is typically reduced using noise reduction components. The intake muffler, the most important noise reduction component in the intake system, has a direct impact on the noise level at the vehicle's air intake. Its muffler performance, specifically the muffler's insertion loss, directly impacts the noise level at the vehicle's air intake.

[0004] The performance of the intake silencer can be theoretically calculated or simulated for targeted design during the design phase, but there is no effective testing equipment to realize the actual silencer performance. Utility Model Content

[0005] In order to overcome the above-mentioned deficiencies in the prior art, the utility model provides a performance testing device for a muffler of an air intake system of a bus.

[0006] To achieve the above objectives, one or more embodiments of the present invention provide the following technical solutions:

[0007] A first aspect of the utility model provides a bus intake system muffler performance test device, comprising a cabinet, with a sound source input pipe and a sound source output pipe respectively provided on two sides of the cabinet;

[0008] The end of the sound source input pipe located outside the cabinet is provided with a port cover, and the end of the sound source input pipe close to the intake muffler to be tested is provided with at least one sound source device

[0009] The interior of the cabinet is filled with sound-absorbing material, and an air intake muffler to be tested is placed in the middle of the cabinet. The air intake muffler to be tested is arranged between the sound source input pipe and the sound source output pipe.

[0010] Furthermore, the sound source device is connected to a sound source power amplifier via a wiring harness, and the sound source power amplifier is arranged on the outer wall of the cabinet.

[0011] Furthermore, the end of the sound source input pipe provided with the port cover is also provided with a soundproof inner cover.

[0012] Furthermore, the sound source input pipe and the sound source output pipe are respectively provided with sound pressure sensors.

[0013] Furthermore, the sound pressure sensor is connected to a data acquisition device located outside the cabinet through a wiring harness.

[0014] Furthermore, the sound source input pipe and the sound source output pipe are coaxially arranged.

[0015] Furthermore, the sound source device is a sound source speaker.

[0016] Furthermore, a cabinet door is hinged on the front of the cabinet.

[0017] Furthermore, the cabinet door is provided with a handle.

[0018] Furthermore, support wheels are provided at the bottom of the cabinet.

[0019] One or more of the above technical solutions have the following beneficial effects:

[0020] The utility model provides a test device with a simple and small structure, low production cost and easy operation, which can quickly and conveniently realize the performance test of the muffler; moreover, the interior of the test device is filled with an attractive material, and a port cover is provided on the sound source input pipe, which can effectively isolate external noise and ensure the test effect.

[0021] Advantages of additional aspects of the present invention will be partially given in the following description, and partially become apparent from the following description, or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0023] Figure 1 This is a schematic structural diagram of a bus intake system muffler performance test device according to Example 1.

[0024] Figure 2 This is a diagram of the internal structure of a bus intake system muffler performance test device according to Example 1.

[0025] In the figure, 1. cabinet body, 2. sound source input pipe, 3. cabinet door installation hinge, 4. cabinet door, 401 door handle, 5. support wheel, 6. sound source output pipe, 7. sound source power amplifier, 8. sound-absorbing material, 9. sound source equipment, 10. sealing cover, 11. sound insulation inner cover, 12. sound pressure sensor wiring harness, 13. muffler to be tested, 14. sound pressure sensor. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] Example 1

[0028] like Figures 1 to 2 As shown, the utility model proposes a bus intake system muffler performance test device, including a cabinet 1, which is the basic carrier of the test device, and various components and parts are installed inside the cabinet to form an overall device.

[0029] The interior of the cabinet 1 is filled with sound-absorbing material 8, which can be any non-metallic material with sound-absorbing and sound-insulating properties, and is used to fill the empty space in the cabinet except for the muffler to be tested, pipes, wires and other components.

[0030] A sound source input pipe 2 and a sound source output pipe 6 are respectively provided on both sides of the cabinet 1. An air intake muffler 13 to be tested is placed in the middle of the cabinet 1, and the air intake muffler 13 to be tested is arranged between the sound source input pipe 2 and the sound source output pipe 6; a port cover 10 is provided at one end of the sound source input pipe 2 located outside the cabinet, and at least one sound source device 9 is provided at the end of the sound source input pipe 2 close to the air intake muffler 13 to be tested.

[0031] The utility model fills the cabinet with sound-absorbing material. The sound-absorbing material can fill the empty space in the cabinet except for the muffler to be tested, pipes, and wiring harnesses. It can isolate external noise to a certain extent and ensure that the sound is mainly emitted by the sound source equipment and then transmitted to the sound pressure sensor 14 of the output pipe 6 through the muffler to be tested.

[0032] As a further technical solution, the sound source input pipe 2 and the sound source output pipe 6 are inserted into the cabinet through holes of the same diameter as the pipes and then connected and secured by welding. Furthermore, after the input pipe 2 and the output pipe 6 are inserted into the cabinet, sufficient space must be left between the two pipes to install the muffler 13 under test. The muffler 13 under test is connected to the sound source input pipe 2 at one end and to the sound source output pipe at the other end, with the sound source input pipe 2 and the sound source output pipe 6 arranged coaxially.

[0033] As a further technical solution, the mounting bracket of the sound source device 9, the installation position of the sound pressure sensor 14 and the wiring harness hole need to be reserved inside the sound source input pipe 2; the sound source device 9 is connected to the sound source power amplifier 7 through the wiring harness, and the sound source power amplifier 7 is arranged on the outer wall of the cabinet 1.

[0034] The mounting bracket can be a rectangular frame, an L-shaped bracket, a door-shaped bracket, etc. The specific structure can be selected according to needs and will not be described here.

[0035] The sound source device 9 of the present invention is connected to the sound source power amplifier 7 through a wiring harness, and the power amplifier 7 is fixed to the upper surface of the cabinet, so as to facilitate the adjustment of the power amplification knob to achieve the adjustment of the power of the sound source device 9.

[0036] As a further technical solution, the sealing cover is provided with a sealing rubber pad at the indentation position of the pipe, and the end of the sound source input pipe 2 provided with the port cover 10 is also provided with a soundproof inner cover 11.

[0037] The utility model installs an input pipe sealing cover 10 and an input pipe sound insulation inner cover 11 at the end of the input pipe 2 to ensure that the sound of the sound source will not leak from the outer port of the sound input pipe 2 and be transmitted outside the cabinet to the sound pressure sensor 14 at the sound output pipe port.

[0038] As a further technical solution, a sound pressure sensor 14 is provided on the sound source input pipe 2 and the sound source output pipe 6 respectively; the sound pressure sensor 14 is connected to a data acquisition device located outside the cabinet 1 through a wiring harness 12 .

[0039] As a further technical solution, a cabinet door 4 is hinged on the front of the cabinet body 1, and a handle 401 is provided on the cabinet door 4, which is a lockable door handle; by providing the cabinet door, it is convenient to fill the cabinet with sound-absorbing materials, install the silencer to be tested, etc.

[0040] As a further technical solution, support wheels 5 are provided at the bottom of the cabinet 1. The support wheels 5 are installed at the four corners of the bottom surface of the cabinet 1. The movement of the equipment is facilitated by providing support wheels at the bottom of the cabinet.

[0041] It is understandable that the bottom of the cabinet 1 is not provided with four universal support wheels, but is placed directly on the ground. To ensure the test effect, it can be fixed in an anechoic test room or on an open space that meets the requirements of noise testing.

[0042] The working process of the utility model test equipment is as follows:

[0043] First, fill the cabinet with sound-absorbing material, primarily at the bottom and interior facade (the space between the muffler under test and the cabinet). Next, install the muffler under test into the equipment and seal the connections. Continue filling the cabinet interior with sound-absorbing material to ensure it's fully filled. Once the sound-absorbing material is completely filled, securely close the cabinet door.

[0044] Start the sound-generating device and noise data collection device according to the equipment operating specifications, and simultaneously adjust the power amplifier knob to minimum. The noise data collection device collects sound pressure data within the sound input and output pipes to calculate the background noise. Next, play white noise or recorded engine noise, increase the source noise by adjusting the power amplifier knob, and collect sound pressure data within the sound input and output pipes again.

[0045] The difference in sound pressure between the sound pressure sensor at the sound output tube when playing noise and when not playing noise (background noise) is calculated to determine whether to continue testing. For example, if the sound pressure difference is greater than 10dB(A), the test can continue; if the sound pressure difference is less than 10dB(A), the above steps must be repeated until the sound pressure difference exceeds 10dB(A). In addition, the test requires that each data acquisition last for at least 15 seconds, and three data sets must be collected.

[0046] Finally, professional data processing software is used to calculate the acoustic transfer function NTF between the data measured by the sound pressure sensor at the sound source and the data measured by the sound pressure sensor at the output end, or the sound pressure difference NR between the two sound pressure sensors, to obtain the performance test results of the muffler.

[0047] Although the above description of the specific implementation methods of the present invention is combined with the accompanying drawings, it does not limit the scope of protection of the present invention. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present invention, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the present invention.

Claims

1. A bus intake system muffler performance test equipment, characterized in that: It comprises a cabinet body, and a sound source input pipe and a sound source output pipe are respectively provided on both sides of the cabinet body; The end of the sound source input pipe located outside the cabinet is provided with a port cover, and the end of the sound source input pipe close to the intake muffler to be tested is provided with at least one sound source device; The interior of the cabinet is filled with sound-absorbing material, and an air intake muffler to be tested is placed in the middle of the cabinet. The air intake muffler to be tested is arranged between the sound source input pipe and the sound source output pipe.

2. A bus intake system muffler performance test equipment according to claim 1, characterized in that: The sound source device is connected to a sound source power amplifier via a wiring harness, and the sound source power amplifier is arranged on the outer wall of the cabinet.

3. The bus intake system muffler performance test equipment according to claim 1, characterized in that: The end of the sound source input pipe provided with the port cover is also provided with a sound insulation inner cover.

4. The bus intake system muffler performance test equipment according to claim 1, characterized in that: The sound source input pipe and the sound source output pipe are respectively provided with sound pressure sensors.

5. The bus intake system muffler performance test equipment according to claim 4, characterized in that: The sound pressure sensor is connected to a data acquisition device located outside the cabinet through a wiring harness.

6. The bus intake system muffler performance test equipment according to claim 1, characterized in that: The sound source input pipe and the sound source output pipe are coaxially arranged.

7. The bus intake system muffler performance test equipment according to claim 1, characterized in that: The sound source device is a sound source speaker.

8. The bus intake system muffler performance test equipment according to claim 1, characterized in that: A cabinet door is hinged on the front side of the cabinet body.

9. The bus intake system muffler performance test equipment according to claim 8, characterized in that: The cabinet door is provided with a handle.

10. The bus intake system muffler performance test equipment according to claim 1, characterized in that: The bottom of the cabinet is provided with supporting wheels.

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