Bump Integrator Test

After construction of New Road, there will be one test to know the frequency of bumps on the newly constructed Road. 

Bump Integrator also known as Roughometer or Automatic Road Unevenness Recorder gives quantitative integrated evaluation of surface irregularities on an digital counter I LCD screen. It comprises of a single wheeled trailer, with a pneumatic tyre mounted on a chassis, on which an integrating device is fitted.

Automatic Road Unevenness Recorder / Bump Integrator

• An Indigenous device developed by CRRI
• It comprises of a standard pneumatic wheel mounted within a rectangular frame with single leaf spring on either side.
• Spring dashpots mounted on the leaf spring provide damping for the suspension
• Integrating unit, mounted on one side of the frame integrates the unevenness in cm.
• For the measurement It is towed by a jeep at a constant speed of 32 kmph under standard tyre pressure of 2.1 kg/cm2 along the designated wheel path
• Bumps in cm and corresponding road length in terms of wheel revolution pulses are displayed / recorded on a panel board

Vehicle Mounted Bump Integrator With GPS (ROMDAS Bump Integrator)

• It is a Vehicle Mounted Bump Integrator System
• This Vehicle Mounted Bump Integrator consists of an integrating unit which is mounted in the dicky on the rear axle of a car/jeep.
• Integrating unit, mounted on the dicky integrates the unevenness in cm or pulses.
• For the measurement vehicle is run at a constant speed of 32 kmph
• Bumps in cm or pulses and corresponding road length in meters are recorded on a computer based data acquisition system.

The unevenness of road is calculated in either one of the above mentioned method. 

Unevenness index is a measure of unevenness which is the cumulative measure of vertical undulations of the pavement surface recorded per unit horizontal length of the road.

Roughometer is a high speed device used for measuring pavement surface roughness. It is a portable type equipment and consists of a small accelerometer (sensor) device installed at the rear axle of survey vehicle, a distance measuring instrument, interface module and a controller. The pavement roughness measurements using this equipment are required to be done preferably at a speed in between 40 to 60 km/hr, in order to obtain most reliable and accurate data. The output is in the units of International Roughness Index (IRI).

 

    A Typical view of Roughometer Control Panel with GPS

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