| 摘要 |
Positioning device for positioning of acoustic pressure sensors on a trailer for a measurement of an acoustic pressure emitted by tires (1) of wheels (2) of the trailer while it is driven on a measured surface (3) of a road comprises a flat template (5) arranged on legs (6), the legs (6) having adjustable height to enable an arrangement of the flat template (5) in parallel with the surface (3) of the road. The flat template (5) is firmly connected to a vertical bar (7) of a holder (4), which is slidably arranged on the bar (7) to enable a central attachment of the positioning device to the hub of the wheel (2). The attachment means for slidably attaching the holder (4) to the vertical bar (7) is lockable. The template (5) is provided at its outer edge with marks for placing the acoustic pressure sensors and with lines extending from said marks on the template (5) and having a common point of intersection for directing the acoustic pressure sensors towards the point of contact between the closest part of the tire and the measured surface (3) of the road. |
