Drone Landing Control on Uneven Ground Using Propeller Speed Adjustment
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Solution Overview
Problem
Drones face instability and risk of overturn when landing on uneven ground surfaces due to lift force imbalances caused by varying ground elevations, leading to potential accidents.
Innovation Solution
A drone equipped with a ground sensing unit to measure distance and shape of the ground, and a controller to differentiate the rotation ratios of propellers based on these measurements, ensuring level landing and preventing overturn by adjusting yaw, pitch, and roll, and using seating legs for stable contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the drone uses equal rotation speed for all propellers during landing, then the control system is simple, but the drone cannot maintain stability on uneven ground surfaces
Solution Approach 1:
The patent applies local quality by making each propeller's rotation speed independently adjustable based on its local ground conditions. The controller receives ground elevation data for each propeller position and adjusts individual propeller speeds to compensate for uneven terrain, allowing each part of the drone to adapt to its specific local environment rather than using a uniform control approach.
Solution Approach 2:
The patent implements dynamics by transitioning from static equal rotation speeds to dynamic, real-time adjustment of propeller speeds. The system continuously monitors ground elevation under each propeller and dynamically modifies rotation speeds during the landing process, enabling the drone to adapt to changing terrain conditions and maintain stability throughout the landing sequence.
2Stability of the object's composition
If the drone adjusts propeller rotation speeds individually for each ground position, then landing stability on uneven surfaces is improved, but the control system complexity increases
Solution Approach 1:
The patent employs feedback by using ground sensing units to detect elevation information and feeding this data back to the controller. The controller then adjusts propeller rotation speeds based on this feedback, creating a closed-loop control system that continuously monitors and corrects for terrain variations, ensuring stable landing while managing complexity through intelligent control algorithms.
Solution Approach 2:
The patent applies self-service by enabling the drone to automatically detect and compensate for uneven ground conditions without external intervention. The ground sensing units and controller work together to autonomously adjust propeller speeds based on real-time terrain data, allowing the system to self-correct and maintain stability without requiring manual piloting or complex external control mechanisms.
3Ease of operation
If the drone maintains equal propeller rotation during descent, then the control mechanism is straightforward, but the drone may overturn on inclined or uneven surfaces
Solution Approach 1:
The patent implements preliminary action by having ground sensing units detect elevation information before the drone completes its descent. The controller uses this advance information to pre-adjust propeller rotation speeds, compensating for uneven terrain before the drone reaches critical landing phases. This proactive adjustment prevents overturning by ensuring proper balance is established in advance.
Solution Approach 2:
The patent applies preliminary anti-action by using ground elevation data to anticipate and counteract potential instability issues before they occur. The system detects inclined or uneven surfaces in advance and adjusts propeller speeds to create compensating forces that prevent overturning, effectively neutralizing the harmful effects of uneven terrain before they can compromise landing safety.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The drone maintains level landing on uneven surfaces, prevents overturn, and can land on inclined planes, ensuring safe and stable operation by adjusting propeller rotations and using gimbal structures with cameras for precise control.
Implementation Method 1
A rotated propeller generates a lift force against a ground or a material (e.g., air, etc.) located under the propeller, thereby maintaining or changing an altitude.
Implementation Method 2
a first distance measuring unit provided in the first housing and configured to measure a distance to a first region of a ground using a laser beam
Data Source
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AI summary
Disclosed is a drone. The present invention includes a plurality of propellers creating a lift to prevent inclination and overturn of the drone due to a lift difference generated from uneven ground, a power driving unit providing a rotation power to each of a plurality of the propellers, a ground sensing unit measuring a distance to a first region of the ground and a shape of the first region, and a controller controlling the power driving unit to differentiate rotation ratios of a plurality of the propellers based on the measured distance and shape if receiving an input signal for landing at the first region.