Milestone 3: Dynamometer Test Stand

Overview

Procedure

Once the engine is securely mounted and properly aligned on the dynamometer stand, performance testing will be conducted to characterize the engine’s output under varying load conditions. The dynamometer is instrumented with sensors that measure engine speed and reaction force at the torque arm. These primary measurements are used to determine torque and power, which are key indicators of engine performance and efficiency.

Testing will be performed incrementally by applying progressive load to the engine through the dynamometer. At each load setting, the system will be allowed to reach steady-state operation to minimize transient effects and ensure the accuracy of recorded data. As the applied load increases, the measured reaction force is expected to increase proportionally, while the engine speed will decrease. This inverse relationship enables precise characterization of the engine’s performance envelope.

At each steady-state condition, engine speed and force readings will be recorded simultaneously. Torque will be calculated using the measured force and the known lever arm radius according to the relation 𝑇=𝐹×𝑟, where 𝐹 is the force at the torque arm and 𝑟 is the length of the torque arm. Power output will then be determined using the formula 𝑃=𝑇×𝜔, where ω is the engine’s angular velocity and 𝑇 is the torque.. All calculations and raw data will be documented for verification and further analysis.

After data acquisition, the collected values will be imported into Microsoft Excel for post-processing. Torque and power curves will be generated to provide a visual representation of engine performance as a function of speed. These plots will be analyzed to identify the engine’s peak torque, maximum power output, and the corresponding operating speeds. The resulting performance curves will assist in evaluating the suitability of the engine for the pulling application and may inform future design modifications to optimize drivetrain performance and efficiency.