Double Imbalance Rotor Vibration Control
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Solution Overview
Problem
Existing vibration control devices for structures face challenges in achieving adjustable force values over time and space while maintaining simplicity, high operational reliability, low production costs, and energy efficiency, as well as robustness.
Innovation Solution
The double imbalance rotor device generates forces and torques through two revolving mass bodies with adjustable rotational speeds, phase relationships, and distances between their axes of rotation, allowing for targeted vibration control by varying the sizes of the masses, rotational speeds, and design parameters within a closed-loop control system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If passive or active control systems with auxiliary masses are used to generate counteracting forces, then vibration control effectiveness is improved, but device complexity and production costs increase
Solution Approach 1:
The patent employs two imbalance rotors with adjustable rotational speeds and phases that can dynamically adapt to varying vibration conditions. The rotors' rotational characteristics are continuously modified through control unit regulation based on sensor feedback, enabling the system to maintain optimal vibration control performance across different operating scenarios without requiring complex mechanical reconfiguration
Solution Approach 2:
The control system modifies key operational parameters including rotational speed, phase angle, and mass distribution of the imbalance rotors. By varying these parameters in response to detected vibration characteristics, the system achieves adaptive vibration control while maintaining a relatively simple mechanical structure, thus resolving the contradiction between control effectiveness and device complexity
2Adaptability or versatility
If the force values generated by the control system are made adjustable in terms of time and space, then vibration control adaptability is improved, but device complexity increases
Solution Approach 1:
The imbalance rotors are designed with independently adjustable rotational speeds and phases, allowing the system to dynamically generate time-varying and spatially distributed counteracting forces. The control unit receives sensor feedback and continuously adjusts the rotational parameters of each rotor to match the temporal and spatial characteristics of the detected vibrations, achieving high adaptability without overly complex control circuitry
Solution Approach 2:
The system utilizes periodic rotational motion of the imbalance rotors to generate harmonic counteracting forces. By controlling the rotational speeds and phases, the system can create periodic force patterns that effectively counteract structural vibrations at different frequencies and locations, providing time and space adjustability through relatively simple rotational mechanics
3Measurement precision
If multiple sensors and control elements are added to achieve precise vibration control, then measurement precision and control accuracy are improved, but energy consumption and production costs increase
Solution Approach 1:
The system employs sensors to detect structural movement and feeds this information back to the control unit, which then adjusts the rotational speeds and phases of the imbalance rotors accordingly. This closed-loop feedback mechanism enables precise vibration control by continuously adapting the counteracting forces to match the actual vibration conditions, achieving high measurement precision and control accuracy while maintaining energy efficiency through demand-responsive operation
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 enables efficient and adjustable force and torque generation, effectively damping vibrations in structures with minimal energy consumption and enhanced operational reliability, accommodating various environmental conditions.
Implementation Method 1
Each mass body forms an imbalance due to the distance between its center of gravity and the assigned axis of rotation. Both axes of rotation extend in the same direction... Each mass body forming an imbalance generates a force that varies over time on its axis of rotation.
Data Source
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AI summary
The invention relates to a device for vibration control of a structure having - two mass bodies (10,20) which are mounted so as to be rotatable about in each case one rotational axis (12,22), wherein the two rotational axes extend in the same direction and the centre of gravity of each mass body has a spacing (r1,r2) from the associated rotational axis, - a drive which sets each mass body (10,20) in a circulating rotational movement, at least one sensor (40) which measures a movement or acceleration of the structure (30) and - a controller which, on the basis of the measured movement or acceleration, controls at least one of the following variables: - the rotational angle (phi1, phi2) of the rotational movement of at least one mass body (10, 20), - the spacing (a) of the rotational axis (12) of a mass body (10) from the rotational axis (22) of the other mass body (20).