JPH0557534B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a test chamber that doubles as a high/low temperature test chamber and an acoustic semi-anechoic chamber, used for environmental testing of vehicles.

B. Summary of the Invention The present invention uses a test chamber that doubles as a semi-anechoic chamber for high- and low-temperature tests and acoustics used for environmental testing of vehicles. By installing an air conditioner through the intake and exhaust ports equipped with splitter-type noise reduction means, it is possible to conduct high- and low-temperature environmental tests and acoustic tests that comply with the standards. be.

C. Prior Art Approximation: As part of improving the quality of vehicles, there is a strong demand for adaptation to a wider range of environments. and,
Various environmental test devices for vehicles are used to test adaptability to the environment.

One type of conventional vehicle environmental test equipment is a high/low temperature test chamber.

The high/low temperature test chamber is basically composed of air conditioning equipment that controls temperature and humidity, vehicle wind speed equipment that controls vehicle wind speed, and exhaust gas treatment equipment.
Some of these are often equipped with power absorption equipment.

In addition, in the case of an all-weather high/low temperature test room, in addition to the above equipment, there are
In many cases, equipment is provided for environmental tests such as snowfall.

In addition to the conventional environmental test equipment for vehicles, there is also a semi-anechoic chamber. The floor of the semi-anechoic room was made of a material that completely reflects sound, and the four walls and ceiling of the other rooms were made of sound absorbing materials with excellent sound absorption properties. Since semi-anechoic chambers require that there be no reflective objects in the surrounding area, they have traditionally been constructed by installing simple air conditioning equipment and exhaust gas treatment equipment.

The high/low temperature test chamber and the semi-anechoic test chamber described above were only installed as separate test chambers.

D Problems to be Solved by the Invention When attempting to configure a vehicle test chamber that serves as both a high/low temperature test chamber and a semi-anechoic chamber, the following problems arose.

First, let's look at the problems with acoustic characteristics.

Anechoic characteristics (ISO 3745
It is required to satisfy the conditions of semi-free sound field shown in .

For this reason, firstly, when a fixed vehicle wind speed fan was installed in the test room, there was a problem that the fan became a reflective object and the acoustic characteristics deteriorated.

Second, there was a problem in that the air conditioning supply/exhaust ports degraded acoustic characteristics.

Thirdly, there was a problem in that the pit inspection cover installed on the floor did not meet the requirements for a hard reflective floor, resulting in poor acoustic characteristics.

Next, we will look at problems with high and low temperature characteristics.

First, in a test room where the room temperature is controlled within the range of 0 to 50 degrees Celsius, when operating under the specified conditions (lowering the temperature from 50 degrees Celsius to 0 degrees Celsius) without humidity control, sound absorbers, pits, There was also the problem of condensation forming on the floor.

In particular, there was a problem that dew condensed on the walls of the test room and on the surface of the sound absorbing material on the ceiling, deteriorating the sound absorption performance.

Second, when a similar test was conducted in the test room with humidity control, there was no condensation on the sound absorber or the floor surface.

However, even if the temperature inside the room was controlled using a dehumidifier, since the pit was covered, ventilation (dehumidification) inside the pit was insufficient, resulting in dew condensation inside the pit.

In view of the above points, the present invention has been developed to improve acoustic characteristics and high
The purpose is to provide a new vehicle test chamber with good low-temperature characteristics that doubles as a high/low temperature test chamber and a semi-anechoic chamber.

E Means for Solving the Problems The vehicle test chamber of the present invention has a completely reflective floor with a pit in the room, sound absorbers are installed on the side walls and ceiling, and a splitter-type sound deadening means is provided. The present invention is characterized in that an air conditioner equipped with a dehumidifier is installed through an air supply port equipped with an air supply port and an air exhaust port, and a drainage means is installed from within the pit.

F Effect By configuring as described above, it is possible to prevent noise from entering the area between the air supply port and the exhaust port, and to achieve anechoic characteristics that comply with the standards.
This prevents condensation inside the chamber during high and low temperature tests, and allows condensation inside the pit to be discharged to the outside.

G Example Hereinafter, one example of the vehicle test chamber of the present invention will be described as a first example.
This will be explained with reference to the drawings and FIG.

Figure 1 is a schematic diagram of the overall configuration.
A low-temperature anechoic chamber, 2 an observation room, and 3 a machine room.

In the high/low temperature anechoic chamber 1, sound absorbers 4 are installed on all four sides and on the ceiling. In this embodiment, an air supply port 6 and an exhaust port 7 connected to the duct 5 of the air conditioner are installed at two predetermined locations on the ceiling.

A muffling section 8 having a structure similar to a splitter type muffler is installed at each of the air supply port 6 and the exhaust port 7.

As shown in FIG.
A space of a predetermined width at each outlet portion of the exhaust port 7 is partitioned by a plurality of partition plates 9, and a sound absorbing material 10 is installed on each side surface of each partition plate 9 and each side surface thereof.

Similar to the splitter type muffler, the sound muffling section 8 allows the sound absorbing material 10 to absorb sound from outside the high/low temperature anechoic chamber 1 by appropriately setting the distance of the space width d between the sound absorbing materials 10. This makes it possible to obtain good anechoic characteristics.

The high/low temperature anechoic chamber 1 has an internal floor surface 11 that is a completely reflective floor surface.

A pit 12, which is a hole for inspecting the lower part of the vehicle, is provided in the floor surface 11. The inside of the pit 12 is finished with waterproof mortar. A drainage pit 13 is provided at the bottom of the pit 12, and a drainage pump 14 is installed here to draw up and drain water droplets due to dew condensation in the pit 12.

There is a steel plate inspection plate 1 in the inspection port part of the pit 12.
5 is removably installed to form a completely acoustically reflective floor surface.

A mobile wind speed fan 16 that can be easily moved and taken out is arranged in the high/low temperature anechoic chamber 1.
The mobile vehicle wind speed fan 16 can be taken out of the high/low temperature anechoic chamber 1 and tested as a semi-anechoic chamber, or the vehicle can be tested with the wind speed fan 16 installed inside the anechoic chamber 1, if necessary. It is possible to measure 17 acoustic characteristics.

A test vehicle 17 is set on a pit 12 in a high/low temperature anechoic chamber 1.

The high/low temperature anechoic chamber 1 is provided with an exhaust gas fan 19 having a damper 18.

The vehicle 17 set in the high/low temperature anechoic chamber 1 is tested while being observed by personnel in the observation room 2.

The high/low temperature anechoic chamber 1 is air-conditioned by the air conditioning equipment 20 in the machine room 3.

Each duct 5 connected to the air conditioning equipment 20 is connected to the high/low temperature anechoic chamber 1 via the silencing parts 8 of the air supply port 6 and the exhaust port 7, respectively, as described above.

The air conditioning equipment 20 includes a cooling tower 21, a cooling water pump 22, an observation room air conditioning package 23, and a dehumidifier 2.
4, a brine chiller 25, a brine pump 26, a brine tank 27, a brine pump 28, a steam header 29, an electric boiler 30, an expansion tank 31, a water supply pump 32, a water supply tank 33, a water softener 34, etc. are connected and configured.

The air conditioning equipment 20 is configured as a temperature/humidity control system to prevent dew condensation on the sound absorbing material 10.

H. Effects of the Invention As detailed above, according to the vehicle test chamber of the present invention, the floor surface with the pit in the room is a completely reflective floor surface, sound absorbers are installed on the side walls and the ceiling surface, and the inside of the pit is An air conditioner including a moisture proofing device connected to the test room through an air supply port and an exhaust port is installed, and a splitter-type noise damping device is installed at each of the air supply port and exhaust port. This configuration has the effect of making it possible to realize a vehicle test chamber that functions as a semi-anechoic chamber with anechoic characteristics that conforms to the standard (ISO 3745) and a high/low temperature test chamber in one room.

Therefore, since the semi-anechoic chamber and the high/low temperature test chamber can be combined into one room, the installation space can be halved and equipment costs can be reduced compared to the conventional two separate chambers. Moreover, it has the effect of increasing the frequency of use of the equipment.

[Brief explanation of the drawing]

FIG. 1 is a schematic overall configuration diagram showing one embodiment of a vehicle test chamber of the present invention, and FIG. 2 is an enlarged sectional view of an air supply port portion thereof. 1... High/low temperature anechoic chamber, 4... Sound absorber, 6...
Air supply port, 7... Exhaust port, 8... Sound deadening section, 9... Partition plate, 10... Sound absorbing material, 12... Pit, 13...
...Drain pit, 14...Drain pump, 15...Inspection board, 16...Car wind speed fan, 20...Air conditioning equipment.

Claims (1)

[Scope of Claims] 1. In a vehicle test chamber that serves as both an environmental test chamber and a semi-anechoic chamber, the floor surface with pits is a completely reflective floor surface, the walls and ceiling surfaces are constructed with sound absorbers, and , comprising an air conditioner including a drainage means in the pit, an exhaust gas exhaust device, and a dehumidifier, and a splitter-type noise reduction means provided in an air supply port into the test chamber and an exhaust port of the air conditioner. Test room for vehicles.