Method for measuring noises outside vehicle in acceleration running state
A technology of accelerating driving and measuring methods, which is applied in the direction of measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc. It can solve the problems of complex installation, harsh measurement environment requirements, high equipment cost, etc., achieve information synchronization and stability, and test time-consuming Short , The effect of low equipment cost
Inactive Publication Date: 2018-03-13
CHINA FIRST AUTOMOBILE
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[0003] Existing mainstream commercial measurement equipment (B&K, LMS) all use GPS speed measurement, wireless laser signals and wireless microphones to synchronize ground and vehicle speed and position information, and multiple sets of equipment are required to complete the measurement of vehicle acceleration outside the vehicle and TPA contribution Analysis, there are problems of complex installation, high equipment cost, and strict requirements on the measurement environment
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[0027] specific implementation plan
[0028] As shown in the accompanying drawing, a method for measuring the noise outside the car when accelerating:
[0029] According to the method in clause 3.9 of GB 1495-20××, the vehicle reference point is determined according to the installation position of the test vehicle engine, and a high-frequency pure tone sound source 1 with a frequency of 6 kHz is installed in the vehicle to emit high-frequency pure tone sound signals, and record The distance between the high-frequency pure tone sound source 1 and the vehicle reference point; the 7.5m measurement point specified in GB1495-20×× is to arrange a microphone every 1m on the horizontal line at a distance of 7.5m from the center point of the PP' line 2. A total of nine microphones 2 are arranged. This setting can ensure that the speed of the vehicle passing through these microphones 2 after entering the line is within a wide range, and record the horizontal distance between each microp...
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The invention, which belongs to the technical field of automotive noise measurement, in particular relates to a method for measuring noises outside a vehicle in an acceleration running state. A high-frequency pure-tone sound source with a known fixed frequency is installed in a vehicle and is used for transmitting a high-frequency pure-tone sound signal; a distance between the high-frequency pure-tone sound source and a vehicle reference point is recorded; a plurality of microphones are arranged at a horizontal line at a distance of 7.5m to a central point of a PP' line, that is, a 7.5-m measuring point regulated in the GB 1495-20xx, and the horizontal distances between the microphones and an incoming line are recorded; the microphones collect time-domain signals emitted by the high-frequency pure-tone sound source, a time-domain analysis is carried out, calculation is carried out to obtain a frequency spectrum change of the high-frequency pure-tone sound source; and then according toa rewritten Doppler shift effect formula, calculation is carried out to obtain vehicle speed information of the tested vehicle passing by each microphone. The method is simple; the information synchronization is stable; and the equipment cost is low.
Description
technical field [0001] The invention belongs to the technical field of automobile noise measurement, and in particular relates to a method for measuring exterior noise of an automobile accelerating. Background technique [0002] As the vehicle speeds up and the noise limit outside the vehicle becomes increasingly strict, the measurement and control technology of the external noise has become an important scientific and technological project for automobile manufacturers. In the new passing noise regulation GB1495-20×× (equivalent to the EU standard ECE R51.3), which is seeking opinions, the biggest difference from the current standard is that the speed of the vehicle under test is required to be 50±1km / h when the reference point crosses the PP' line At the same time, the requirements for the power and gear position of the car are more complicated than the measurement method in the current standard (GB / T 1495-2002). It is necessary to measure and judge the passing noise, vehic...
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IPC IPC(8): G01H17/00
CPCG01H17/00
Inventor 李凌志卢炳武张言张智程海龙
Owner CHINA FIRST AUTOMOBILE