Multi-copter Intermediate Supporting Bar Vibration Cancellation
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Solution Overview
Problem
Multi-copters experience vibration issues due to propeller rotation, which interfere with image quality during high-altitude photography, and existing solutions like gimbal anti-vibration members add unnecessary load and cost by requiring additional structures.
Innovation Solution
The method involves configuring multi-copter propellers into sets with a phase difference of 180 degrees, where each propeller set rotates at the same RPM in opposite directions, with intermediate supporting bars to cancel out vibrations before they reach the fuselage, thereby reducing overall vibration transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If gimbal anti-vibration members or dampers are added to remove vibrations transmitted to the camera gimbal, then image quality is improved, but device complexity and manufacturing cost increase due to additional structures
Solution Approach 1:
The patent introduces intermediate supporting bars as intermediary structures between the propellers and fuselage. These bars serve as mediators that receive vibrations from propellers and transmit them to other propellers in the set, enabling vibration cancellation without directly interfering with the camera gimbal system. This resolves the contradiction by providing vibration reduction through an intermediate mechanism rather than adding complex anti-vibration components to the camera system.
Solution Approach 2:
The patent converts the harmful vibrations generated by propellers into a beneficial effect by utilizing these vibrations to cancel out other vibrations. The intermediate supporting bars transmit propeller vibrations to other propellers in the set, where they interfere destructively with other vibration sources, thereby reducing overall vibration transmission to the camera. This transforms the originally harmful vibration energy into a useful vibration cancellation mechanism.
2Object-affected harmful factors
If gimbal anti-vibration members are added to buffer vibration transmitted to the fuselage, then vibration transmission is reduced, but weight increases due to additional components
Solution Approach 1:
The patent implements a self-service vibration reduction mechanism where the propellers and intermediate supporting bars work together to cancel their own vibrations. The system uses the vibrations generated by each propeller to counteract vibrations from other propellers in the set, eliminating the need for separate anti-vibration components. This self-service approach reduces vibration transmission without adding the weight of additional damping materials or active vibration control systems.
3Object-affected harmful factors
If multiple separate components (panels, fixing bodies, anti-vibration members) are used to attenuate vibration, then vibration reduction is achieved, but ease of manufacture deteriorates due to assembly complexity
Solution Approach 1:
The patent merges the vibration transmission function and vibration cancellation function into a single integrated structure. The intermediate supporting bars simultaneously serve as structural support elements and vibration cancellation mechanisms, eliminating the need for separate panels, fixing bodies, and anti-vibration members. This merging of functions simplifies manufacturing and assembly while maintaining effective vibration attenuation.
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 approach minimizes vibration transmission to the fuselage without adding extra structures, effectively reducing propeller-induced vibrations and improving image quality by canceling out vibrations at the intermediate supporting bars rather than the fuselage.
Implementation Method 1
an intermediate supporting bar disposed between a propeller and a fuselage of a multi-copter and configured by three or more intermediate supporting bars which have one ends fixed to the fuselage and radially extend from the fuselage
Implementation Method 2
uses a phase difference of vibrations in accordance with rotation of the propeller and a principle that a sum of the vibrations having the same frequency is increased or decreased according to a phase angle
Data Source
AI summary
Provided is a multi-copter, including: a fuselage; three or more intermediate supporting bars which have one ends fixed to the fuselage and radially extend from the fuselage; two mounting rods which are divided into two branches at the other ends of the intermediate supporting bars; and a propeller set configured by two propellers which are mounted to two mounting rods and rotate at the same rotational speed (RPM) in opposite directions. When an angle formed by any one propeller between two propellers which form the propeller set and the mounting rod is a first angle and an angle formed by the other one propeller and the mounting rod is a second angle, a difference between the first angle and the second angle is 360/2n degrees and n is a number of blades for every propeller.