Increasing the efficiency of acoustic measurements
Use the VEHICO CG300 gas paddle robot in your noise measurement and thereby significantly increase efficiency, e.g. in a noise pass-by measurement.
Driving robot for the accelerator
During type approval, manufacturing companies must prove that their vehicles do not exceed certain noise levels. The level of these noise levels for the vehicle in motion is described in internationally harmonised regulations.
The current noise level limits applicable throughout Europe are regulated in Regulation (EU) No 540/2014 on the noise level of motor vehicles and replacement silencing systems. The limit values are stated in decibels(A) and differ depending on the vehicle class and the power-to-mass ratio. The current limit values have been in force for new vehicle types since 1 July 2016 (phase 1). A further reduction of the limit values from 1 July 2020 (phase 2) and 2 July 2024 (phase 3) is already stipulated. For a passenger car with a power-to-mass ratio of less than 120 kW/1000 kg, the phase 1 limit is 72 db(A), the phase 2 limit is 70 db(A) and the phase 3 limit is 68 db(A).
The statistical pass-by measurements are defined in the ISO 11819-1 standard.
In future directives, not only a defined constant speed at the specified measuring point will be controlled, but also a defined acceleration.
To determine the driving noise, a defined test sequence must be run on a standardised test track. For the statistical pass-by measurement according to ISO 11819-1 standard, the measurement distance from the centre of the road is 7.5 m and the measurement height is 1.2 m above the road level. During the measurements, the vehicle speed is measured in addition to the noise level.
The maximum noise level (Lmax) during a drive-by is the measurement result.
By using the accelerator robots, the measurement parameters can be set precisely. For example, in a noise pass-by measurement, the defined constant speeds as well as the future required accelerations at the specified measuring point can be precisely controlled.