Dynamics Analysis of Golf Carts
This paper analyzes the dynamics of golf carts using a vehicle dynamics framework. As a typical low-speed specialized vehicle, the dynamics considerations of golf carts have both general applicability and specific focus.
The following is a targeted analysis based on the three core directions of this document:
1. Longitudinal Dynamics Analysis: The longitudinal dynamics design of golf carts focuses on meeting the specific needs of their application scenarios:
Driving Force and Driving Resistance: The driving force provided by the electric motor or internal combustion engine mainly overcomes rolling resistance (the resistance on soft surfaces such as grass and sand is significantly higher than on paved surfaces) and gradient resistance (golf courses often have undulating terrain). Air resistance has minimal impact due to the very low speed (usually below 30 km/h).
Power Performance Indicators: Maximum speed is not a key indicator; low-speed acceleration performance (e.g., from a standstill to 20 km/h) and maximum gradeability are more important to ensure passability when going uphill and navigating obstacles on the course.
Braking Performance: Good braking stability is crucial. Front and rear axle braking force distribution needs to be considered to prevent skidding or fishtailing during braking on wet, slippery grass or slopes. While it may not be equipped with sophisticated ABS, its braking system design must ensure controllability on various low-traction surfaces.
Energy Economy: For electric golf carts, range is a core metric. Optimization strategies include reducing rolling resistance, improving transmission efficiency, and managing battery power consumption to support extended, intermittent course operations.
2. Lateral Dynamics Analysis
The steering and handling characteristics of a golf cart directly affect its maneuverability and safety:
Tire Mechanics: Wide-section, low-pressure tires are commonly used to increase contact area, reduce damage to the turf, and provide necessary lateral force. Tire lateral characteristics determine the vehicle’s response during cornering.
Vehicle Steering Characteristics: Typically designed with moderate understeer to ensure stability and safety during low-speed sharp turns (such as around obstacles or trees), avoiding the risk of rollover due to oversteer (although the risk is relatively lower than in passenger cars due to the low center of gravity and slow speed).
Vehicle Model: A bicycle model can be used for preliminary analysis of its steady-state steering characteristics, but the actual wheelbase, track width, and center of gravity position must be considered in relation to the turning radius and stability. 3. Vertical Dynamics Analysis
Due to the varied road surfaces (lawns, gravel roads, slight bumps), vertical dynamics are crucial for comfort and handling:
Smoothness: While the requirements for high-speed ride comfort are not as stringent as for passenger cars, the suspension system still needs to filter out continuous low-frequency vibrations caused by uneven road surfaces, ensuring basic comfort for the driver and passengers during extended use.
Handling and Ground Contact: The suspension system needs to consider tire contact with the ground, ensuring that the wheels do not easily lift off the ground on bumpy roads to maintain the continuity of driving and steering forces. This is important for stability during hill climbing and cornering.
Vibration Model: A 1/4 vehicle model can be used to analyze the vibration response of its suspension-wheel system to road inputs, guiding the tuning of suspension stiffness and damping.
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