Tilting Rotor Layout for VTOL Aircraft Pitch Control Stability
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Solution Overview
Problem
Existing vertical take-off and landing aircraft face difficulties in pitch control due to significant airflow interference between the tilting rotor on the empennage and the empennage, making it challenging to maintain stable flight.
Innovation Solution
The aircraft is designed with 2N tilting rotors symmetrically arranged around the fuselage, where the projections of their propellers are centrally symmetrical about point B, which moves along the symmetry plane towards the empennage during transitions, and differential pitch control is achieved by adjusting tilt angles, speeds, and rotation speeds of the rotors to balance moments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a tilting rotor is provided on the empennage to achieve vertical take-off and landing capability, then the aircraft can operate from urban platforms, but the rotor airflow interferes with the empennage airflow causing pitch control difficulty
Solution Approach 1:
The aircraft divides the rotor system into multiple independent tilting rotors (at least two) positioned at different locations (wing and empennage), allowing independent control of each rotor's tilt angle and rotation speed to manage airflow interference and achieve precise pitch control
Solution Approach 2:
The control system dynamically adjusts parameters including the tilt angles of different rotors, rotation speeds of individual rotors, and collective pitch to compensate for airflow interference between the empennage rotor and empennage surfaces, maintaining stable pitch control across different flight phases
2Device complexity
If the rotor is positioned on the empennage for compact design, then the aircraft structure is simplified, but the rotor wash creates unpredictable technical difficulties in flight control
Solution Approach 1:
The control system acts as an intermediary that continuously monitors and compensates for the airflow interference between the empennage rotor and empennage surfaces by adjusting rotor tilt angles and rotation speeds, transforming the unpredictable interference into a controllable parameter
Solution Approach 2:
The system employs dynamic adjustment of rotor tilt angles and rotation speeds based on real-time flight conditions, allowing the aircraft to adapt to changing airflow patterns and maintain stable flight control throughout the transition from vertical to horizontal flight
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
This configuration reduces airflow interference, enhances pitch control stability, and improves the aircraft's ability to transition smoothly between vertical take-off, landing, and cruising states, ensuring safer and more stable flight.
Implementation Method 1
2N tilting rotors symmetrically provided at both sides of the fuselage... in a vertical take-off and landing state, projections of propellers of the 2N tilting rotors on a horizontal plane are centrally symmetrical about point B
Implementation Method 2
the airflow generated by the rotor and the airflow generated by the empennage interfere with each other, which easily causes difficulty in pitch control
Data Source
AI summary
A vertical take-off and landing aircraft includes: a fuselage and 2N tilting rotors. Both sides of the fuselage are provided with a wing symmetrically, a tail of the fuselage is provided with an empennage, and ruddervators are provided at the empennage. 2N tilting rotors are symmetrically provided at both sides of the fuselage, and a part of the 2N tilting rotors are provided on the empennage. N is a natural number greater than or equal to 2; in a vertical take-off and landing state, projections of propellers of the 2N tilting rotors on a horizontal plane are centrally symmetrical about point B, point B and a center of gravity point G of the vertical take-off and landing aircraft are both provided in a symmetry plane of the fuselage.