Heat insulation and sound transmission device for noise vibration temperature and humidity comprehensive test

Abstract

The invention provides a heat insulation and sound transmission device for a noise vibration temperature and humidity comprehensive test and a comprehensive environment test box formed by the device, which adopt a heat insulation and sound transmission design method, can be applied to a noise, vibration, temperature and humidity multi-factor composite environment simulation test system, and is used for isolating an air supply flow and a temperature and humidity field of a noise system. The technical problem that the temperature and humidity field is interfered by airflow is solved. According to the device, noise can penetrate through, noise, vibration, temperature and humidity coupling fields form an independent space, and uniformity and deviation of temperature and humidity in a noise environment are guaranteed.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of environmental simulation test, and particularly relates to a heat-insulating sound-transmitting device for noise-vibration-temperature-humidity comprehensive test. BACKGROUND

[0002] Electronic components will experience noise, vibration, temperature, humidity and other comprehensive environment in the whole life cycle. How to simulate the environmental factors in the transportation, storage and use process in the early stage of equipment development, carry out test verification, and improve the quality performance of equipment, the multi-factor accelerated simulation test technology is urgently needed to be researched, and a comprehensive component-level test device is explored as technical support. The test standard also clearly proposes that "comprehensive environmental test may be more representative of actual environmental effects than a series of consecutive single tests, and when these conditions are encountered in the use environment, comprehensive environmental test is encouraged".

[0003] Foreign countries have widely carried out research on multi-factor accelerated simulation test technology, formed corresponding theoretical methods and test devices, and applied these technologies to the environmental adaptability and reliability evaluation of equipment. The material and process system in China is quite different from that abroad, and the geographical environmental conditions of equipment use are quite different, so even if the evaluation method, device and other technical means are introduced, they are difficult to be directly applied, and their applicability needs to be verified.

[0004] The use of an electric airflow loudspeaker in a noise, vibration, temperature, humidity comprehensive test system can ensure that the total sound pressure level reaches the required noise environment. However, when the electric airflow loudspeaker loads noise, the pressure gas will enter the test equipment through the horn, and the airflow speed can reach dozens of meters per second. The inflow of pressure gas will cause great disturbance to the temperature and humidity system controlled by circulation convection, destroy the uniformity of the temperature and humidity field in the noise, vibration, temperature, humidity multi-factor coupling environment, and affect the equipment temperature rising rate, temperature uniformity, deviation and other indicators. SUMMARY

[0005] The purpose of the present application is to solve the problems existing in the prior art, and to provide a heat-insulating sound-transmitting device for noise-vibration-temperature-humidity comprehensive test. The heat-insulating sound-transmitting design method is applied to a noise, vibration, temperature, humidity multi-factor composite environment simulation test system, and is used to isolate the noise system gas flow and the temperature and humidity field, solving the technical problem of disturbance of the temperature and humidity field by the gas flow. The device can transmit noise, form an independent space for the noise, vibration, temperature, humidity coupling field, and ensure the uniformity and deviation of temperature and humidity in the noise environment.

[0006] The present application provides a heat-insulating sound-transmitting device for noise-vibration-temperature-humidity comprehensive test, which comprises a main frame, a plurality of cross beams, a plurality of vertical beams, a cross beam vertical beam mounting interface, a heat-insulating sound-transmitting film, and a device reserved for mounting with a bulkhead and a bulkhead mounting interface.

[0007] The heat-insulating sound-transmitting device is vertically placed in the cabin to form a comprehensive environmental test box. The heat-insulating sound-transmitting device divides the space of the test box into a noise loading area and a temperature, humidity and vibration test area. The noise loading area uses an electric airflow loudspeaker sound source, which is connected to the test box through a number tube. The temperature, humidity and vibration test area is equipped with an improved temperature and humidity circulation system. During the comprehensive environmental test loading, the central sound-transmitting insulation layer is sealed to ensure the air tightness of the temperature, humidity and vibration test area. At the same time, exhaust ports are arranged on the walls of the noise loading area to exhaust the gas overflowing from the loudspeaker, thereby ensuring the air pressure balance between the left and right areas. The overall wall of the comprehensive environmental test box is designed to be sound-insulating. The noise generated by the electric airflow loudspeaker is transmitted through the central sound-transmitting insulation layer to realize reverberation in the entire box. In this way, the influence of airflow scouring on the temperature and humidity circulation in the temperature, humidity and vibration test area during noise loading is reduced.

[0008] The sound-transmitting insulation layer blocks the airflow input from the electric airflow loudspeaker during its operation into the temperature and humidity area of the test box, thereby avoiding affecting the uniformity of the temperature and humidity field. At the same time, the sound-transmitting insulation layer blocks the high and low temperature and humid air in the test box from entering the electric airflow loudspeaker, thereby ensuring that the electric airflow loudspeaker is in a working environment that it can withstand and can work normally under high and low temperature tests. During temperature tests without applying a noise field, in order to avoid changing the temperature of the noise area through heat conduction and heat radiation (exceeding the bearing range of the microphone and the electric airflow loudspeaker), a small amount of airflow can be loaded through the airflow loudspeaker to protect the temperature of the noise area.

[0009] The process design flow is as follows: first, aluminum profile frames are customized according to the size of the inner cavity of the test box, and aluminum struts are connected to strengthen the structure. The overall structure is installed on the inner wall of the box, and the sound-transmitting insulation layer is installed on the frame. All gaps are sealed with adhesive with good temperature characteristics to prevent air permeability.

[0010] The beneficial effects of the present application are as follows:

[0011] 1. The present application adopts a sound-transmitting heat-insulating design to form a heat-insulating sound-transmitting device with a modular structure, which divides the comprehensive test system into a noise loading area and a comprehensive environmental test area. This design eliminates the interference effect of the noise loading of the pneumatic loudspeaker on the temperature and humidity environment, and solves the key problem of noise, vibration, temperature and humidity comprehensive test technology.

[0012] 2. The present application adopts a modular design of heat-insulating sound-transmitting structure, proposes a modular design idea, and designs the overall modular structure with frames and beams as structural units. The structure of the sound-transmitting heat-insulating device can be flexibly configured according to different comprehensive environmental test system structure forms to meet different test requirements, and the structure and installation form of the sound-transmitting device are simple. BRIEF DESCRIPTION OF DRAWINGS

[0013] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, illustrate the preferred embodiments of the application and assist in

[0014] Figure 1 is a structure schematic diagram of the heat-insulating sound-transmitting device of the embodiment of the present application, Figure 1 (a) is a left view, and (b) is a right view;

[0015] Figure 2 is a schematic diagram of the heat-insulating sound-transmitting device and the cabin body assembly of the embodiment of the present application;

[0016] Figure 3 is a schematic diagram of the heat-insulating sound-transmitting device test work flow of the embodiment of the present application.

[0017] 1-device and cabin wall installation interface 2-main frame 3-cross beam 4-device and cross beam vertical beam installation interface 5-vertical beam 6-heat-insulating sound-transmitting film 7-temperature and humidity vibration and noise test area 8-nitrogen outlet 9-noise airflow outlet 10-heat-insulating sound-transmitting device 11-noise loading area 12-1 noise cone 1 12-2 noise cone 2 DETAILED DESCRIPTION

[0018] In order to enable personnel in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work should fall within the protection scope of the present application.

[0019] The present embodiment provides a heat-insulating sound-transmitting device for noise vibration temperature humidity comprehensive test, and a structure schematic diagram thereof is shown in Figure 1 The heat-insulating sound-transmitting device comprises a main frame 2, a plurality of cross beams 3, a plurality of vertical beams 5, a heat-insulating sound-transmitting film 6, and a device and cabin wall installation interface 1 reserved for cabin wall installation.

[0020] As shown in Figure 2As shown in the heat insulation sound transmission device and cabin assembly profile diagram, the heat insulation sound transmission device 10 is vertically placed in the cabin, and is fixed on the cabin wall through the device and cabin wall mounting interface 1 reserved on the side of the main frame, so as to divide the cabin space into a temperature and humidity vibration noise test area 7 and a noise loading area 11. When the temperature and humidity vibration noise test area uses liquid nitrogen cooling, open the nitrogen outlet 8, and the nitrogen gas vaporized by the liquid nitrogen in the temperature and humidity vibration noise test area 7 is discharged outside the cabin to prevent the pressure in the cabin from being overpressure. When the temperature, humidity and vibration test conditions in the temperature and humidity vibration noise test area 7 reach the target value, start the pneumatic noise speaker, i.e. noise cone 112-1 and noise cone 212-2, and start the noise environment loading to form the noise sound wave penetrating the heat insulation sound transmission device 10, and form the noise, temperature, humidity and vibration comprehensive test environment in the temperature and humidity vibration noise test area 7. The heat insulation sound transmission film 6 of the heat insulation sound transmission device 10 can effectively isolate the temperature and humidity of the two areas, prevent the heat leakage of the high and low temperature environment in the temperature and humidity vibration noise test area, and affect the uniformity of the temperature and humidity of the whole test area. Due to the effect of the heat insulation sound transmission device 10, the gas flow generating noise will not affect the temperature field and humidity field of the temperature and humidity vibration noise test area. The gas driving the pneumatic speaker to generate noise is discharged outside the cabin through the noise gas outlet 9 to ensure the pressure balance on both sides of the heat insulation sound transmission device 10.

[0021] The application also provides a heat insulation sound transmission device test working process, and a flow chart is shown as Figure 3

[0022] First, the heat insulation sound transmission film 6 is fixed on the four sides of the main frame 2 through the cross beam 3 and the vertical beam 5, and is fixed and installed through screwing with the device and cross beam vertical beam mounting interface 4 reserved on the main frame 2. Then, the remaining cross beams 3 are fixed on the main frame 2 through the device and cross beam vertical beam mounting interface 4, and the remaining vertical beams 5 are installed on the other side of the heat insulation sound transmission film 6, so that the cross beams 3 and the vertical beams 5 are located on the two sides of the heat insulation sound transmission film 6, respectively. The heat insulation sound transmission film 6 is fixed by tightly pressing through the cross beam 3 and the vertical beam 5. Finally, all the gaps are sealed by using an adhesive with good temperature characteristics to prevent air permeability.

[0023] The heat insulation sound transmission device for noise vibration temperature humidity comprehensive test provided by the application can obtain a good noise vibration temperature humidity comprehensive test environment through test verification, and the uniformity of temperature, humidity and noise all meet the standard requirements and meet the comprehensive environment test requirements.

[0024] The heat insulation sound transmission device for noise vibration temperature humidity comprehensive test provided by the application has the advantages of simple principle, convenient use, good stability, strong universality and interchangeability, low failure rate and stable performance. The device can adjust the structure size according to the requirements of the comprehensive environment test equipment under different working conditions, and can adapt to the comprehensive environment test system under noise of various structure sizes.

[0025] ​The device is not limited to the noise vibration temperature humidity comprehensive test, various changes and extensions can be made without departing from the purpose of the application, such as can be applied to noise temperature, noise humidity, noise vibration test and other composite environment combination test requirements, can play the same effect, which is not described in detail in the application.

[0026] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A heat-insulating and sound-transmitting device for a comprehensive noise, vibration, temperature, and humidity test, characterized in that, It includes a main frame, multiple crossbeams, multiple vertical beams, a heat-insulating and sound-permeable membrane, and a reserved interface for installation with the bulkhead; the device can transmit noise and form an independent space by coupling the noise, vibration, temperature and humidity fields, ensuring the uniformity and deviation of temperature and humidity in a noisy environment.

2. The heat-insulating and sound-transmitting device for a comprehensive noise, vibration, temperature, and humidity test according to claim 1, characterized in that, It can prevent airflow from entering the temperature and humidity zone during the operation of the external electric airflow speaker.

3. The heat-insulating and sound-transmitting device for a comprehensive noise, vibration, temperature, and humidity test according to claim 2, characterized in that, An electric airflow loudspeaker that can block high and low temperature and humid airflow from entering the device.

4. The heat-insulating and sound-transmitting device for a comprehensive noise, vibration, temperature, and humidity test according to claim 1, characterized in that, The main frame and beams are made of aluminum.

5. A heat-insulating and sound-transmitting device for a comprehensive noise, vibration, temperature, and humidity test according to claim 1, characterized in that, The heat-insulating and sound-permeable membrane is installed on the frame to form a sound-permeable and heat-insulating layer.

6. A heat-insulating and sound-transmitting device for a comprehensive noise, vibration, temperature, and humidity test according to claim 5, characterized in that, The gaps are sealed with an adhesive that has good temperature characteristics to prevent air from getting in.

7. A comprehensive environmental test chamber, characterized in that, It includes the heat-insulating and sound-permeable device, nitrogen outlet, noise airflow outlet, and pneumatic noise loudspeaker as described in claims 1-6.

8. The comprehensive environmental test chamber according to claim 7 is divided into a temperature, humidity, vibration and noise test zone and a noise loading zone, with the heat insulation and sound transmission device as the boundary. The noise loading zone is subjected to noise environment loading by a pneumatic noise loudspeaker, and the resulting noise sound waves penetrate the heat insulation and sound transmission device.

9. In a comprehensive environmental test chamber according to claim 8, when liquid nitrogen is used to cool the temperature, humidity, vibration and noise test area, the nitrogen outlet is opened to discharge the vaporized nitrogen from the liquid nitrogen in the temperature, humidity, vibration and noise test area outside the chamber, preventing the pressure inside the chamber from exceeding the limit.

10. A comprehensive environmental test chamber according to claim 8, which forms a comprehensive test environment of noise, temperature, humidity and vibration in the temperature, humidity and vibration test area.

Images