Vehicle unpaved road response spectrum acquisition based on accelerometer and GPS data.

Area of Science:

• Engineering
• Transportation Science
• Geotechnical Engineering

Background:

• Vehicle dynamics on unpaved roads are crucial for durability assessment.
• Existing methods struggle with time-varying speeds and accurate distance measurement.
• Response spectrum analysis is vital for simulating road conditions.

Purpose of the Study:

• To develop a system for acquiring dynamic responses of vehicles on unpaved roads.
• To propose a time-space conversion method for accurate response spectrum calculation.
• To enhance the accuracy of vehicle distance information for improved analysis.

Main Methods:

• Utilizing spindle accelerometers and a time-synchronized on-board GPS receiver.
• Implementing a time-space conversion technique from equitime to equidistance sampling.
• Applying long-range error correction using independent GPS distance histories.

Main Results:

• Successfully collected dynamic response data of a vehicle on an unpaved road.
• Demonstrated the effectiveness of time-space conversion in eliminating speed variation effects.
• Verified the system's accuracy and validity through implementation on a wheel loader.

Conclusions:

• The developed system provides a practical approach for obtaining unpaved road response spectra.
• The proposed methods enhance the accuracy of dynamic response measurements for durability simulation.
• This system is valuable for road simulation and vehicle design optimization.