1. Effect of Altitude on Engine Performance
The chapter discusses the effects of altitude on the performance of internal combustion engines, the importance of performance charts for analyzing machine capabilities, and various factors affecting usable power, including underfoot conditions. It emphasizes the need for maintaining the correct fuel-to-air ratio and discusses different payload measurement methods as well as how various gear mechanisms affect operational efficiency.
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What we have learnt
- Altitude reduces atmospheric pressure, resulting in lesser air density, which impacts engine efficiency.
- Performance charts provided by manufacturers aid in understanding machine capabilities under specific project conditions.
- Consistent volumetric measures are essential for accurate productivity estimations and calculations.
Key Concepts
- -- Usable Power
- The power available for doing work after considering the resisting forces and environmental conditions such as altitude and temperature.
- -- Performance Charts
- Graphs that represent the power output and speed capabilities of machines under specific project conditions, helping to assess their performance.
- -- FueltoAir Ratio
- The ratio of fuel to air in the combustion chamber, which is critical for the efficient operation of internal combustion engines.
- -- Swell Factor
- A measure of how much the volume of a material increases once it is excavated and loosened, affecting calculations of payload.
- -- Shrinkage Factor
- A measure of how much the volume of a material decreases after compaction, important for estimating compaction-related productivity.
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