UAV Arm Intersection Forward Shift for Stability
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Solution Overview
Problem
Unmanned aerial vehicles (UAVs) with multiple rotor configurations face instability and control challenges due to mass distribution, leading to uncontrollable overturning forces when vertical forces change.
Innovation Solution
The UAV design relocates the arms' intersection point forward, reducing vertical mass distribution and incorporating a folding sprinkle-nozzle rod and heat dissipation waterproof cover to enhance stability and control, while allowing for efficient storage and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the arms and their intersection point are positioned at the geometric center of the airframe, then the lift force and gravity center are aligned for balance, but much mass is distributed in the vertical direction causing uncontrollable overturning force moments
Solution Approach 1:
The patent moves the arms' intersection point from the vertical center to the front horizontal position, changing the mass distribution from vertical concentration to horizontal distribution. This dimensional shift relocates the lift force acting point forward, creating a horizontal offset that counteracts vertical overturning moments through moment arm geometry.
Solution Approach 2:
The patent creates an asymmetric configuration where the arms' intersection point is positioned at the front of the airframe rather than at the geometric center. This asymmetric placement of the lift force acting point generates a stabilizing moment that counteracts the overturning forces caused by vertical mass distribution.
2Stability of the object's composition
If the arms' intersection point is moved forward to reduce vertical mass distribution, then stability and control are improved, but space for disposing articles storing device behind the airframe must be optimized
Solution Approach 1:
The patent segments the airframe into distinct functional zones: the front section contains the arms' intersection point and lift force acting point for stability, while the rear section is dedicated to the articles storing device. This spatial segmentation allows both stability and storage requirements to be satisfied simultaneously.
Solution Approach 2:
By positioning the arms' intersection point at the front horizontal position rather than at the vertical center, the patent creates unused vertical and rear horizontal space that can be utilized for the articles storing device, thus resolving the space constraint.
3Power
If multiple rotor wings are arranged around the aircraft to provide equal lift forces, then the total lift force acts on the geometric center, but this configuration causes bumping and loss of balance when vertical forces change
Solution Approach 1:
The patent introduces the arms as intermediary structural elements that transmit the lift forces from the rotor wings to a forward positioned intersection point. This intermediary configuration allows the lift forces to be effectively relocated from the geometric center to the front position, creating a stabilizing moment arm that prevents balance loss during vertical force changes.
Data Source
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AI summary
An unmanned aerial vehicle is provided and includes: an unmanned aerial vehicle body, including an airframe and a articles storing device; an arm, including at least two front arms symmetrically arranged with respect to a central axis of the airframe along a front-rear direction and at least two rear arms symmetrically arranged with respect to the central axis of the airframe; and a rotor-wing electric motor, including a front electric motor and a rear electric motor. A first end of the front arm is connected with a front end of the airframe, and a second end of the front arm is provided with the front electric motor to drive the unmanned aerial vehicle. A first end of the rear arm is connected with a rear end of the airframe, and a second end of the rear arm is provided with the rear electric motor to drive the unmanned aerial vehicle. An intersection region of an extension line of the rear arm towards the airframe and an extension line of the front arm towards the airframe is located in front of a lift force center of the unmanned aerial vehicle, an acting point of a resultant force from the front electric motor and the rear electric motor exerted on the unmanned aerial vehicle is the lift force center, and a gravity center of the unmanned aerial vehicle is adjacent to the lift force center.