LOWER THE NOISE WITH SANDVIK TRUCK BOX RUBBER LINERS

Ever heard the sound of large rocks crashing onto metal when dropped from a height? Well even if you haven’t, you can probably imagine how loud the noise is, which is why Sandvik manufactures rubber liners designed to be fitted into truck boxes. The rubber liners serve as a shock absorber, not only reducing noise produced but also helping to prolong the life of the truck and help the driver battle fatigue.

There are many benefits to using rubber liners both for the customer and the environment. The Wear protection and screening media team at Sandvik Mining carried out a comparison between the uses of rubber lining versus steel lining. The study was carried out on a CAT 793F loaded with Granite by a front shovel O&K RH340 and a loader Letourneau L1850 in an open cast area. Measurements were taken when the truck was loaded with a first bucket then a second on top.

Parameters measured were:

  • Interior noise
  • Exterior noise
  • Structural vibrations on the frame and truck box
  • Seat vibrations

THE RESULTS WERE SIGNIFICANT:

Test Results achieved with steel liners Results achieved with rubber liners Benefits of rubber liners
Interior sound pressure level (microphone placed on operator’s seat within the cabin) Average 86 dB (A)*
Maximum 95 dB (A)*
Average 69 dB (A)*
Maximum 79 dB (A)*
Major (17 dB (A))* interior noise reduction. Improved working conditions for operators
Exterior sound pressure level (microphone placed at 30 metres distance from truck) Average 90 dB (A)*
Maximum 100 dB (A)*
Average 75 dB (A)*
Maximum 83 dB (A)*
Major (15 dB (A))* exterior noise reduction. Improved conditions for the drivers and for the public area living close to the mine site
Structural vibrations (measured with an accelerometer attached to the chassis of the truck between the operator cabin and truck box) Peak acceleration is typically 8 times higher when using a steel lining compared to rubber Instantaneous peak acceleration over time reduced with a factor of 8 Improvement on structural vibrations. Less strain on truck box and structure, prolonged spare parts life (e.g. differential ,truck box maintenance, drive chain, shocks absorbers)
Seat vibrations (tested using a seat pad accelerometer) Weighted RMS amplitude for seat 0,39 m/s2 Weighted RMS amplitude for seat 0,33 m/s2 On average a 15% reduction of vibrations. The truck was fitted with an effective seat air suspension system which enabled a comfortable seating position for the operator.

Opposite is just one example of Sandvik’s rubber liners being used at a customer site and the results they have given

If you would like to find out more about Sandvik’s rubber liners for trucks or any other products, please contact us.

*dB (A)

A-Weighted decibels, abbreviated here as dB (A), is the most common weighting scale that is used in noise measurement. It follows the frequency sensitivity of the human ear at low levels and is a good predictor of damage risk to the ear. A-Weighting scaled sound meters filter out low-frequency noise that they measure, which is similar to the response of the human ear.