Hybrid Rotational Torque Control for Bridge Torsional Vibration
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Solution Overview
Problem
Existing passive dampers are ineffective in controlling torsional vibrations in bridges, leading to poor bridge stability and potential collapse due to resonance, overheating, and chaotic control effects under different excitation frequencies.
Innovation Solution
An active-passive hybrid control system comprising a first rotating shaft, elastic reset member, rotating members, motors, sensors, and a controller, which generates counteracting torque to suppress torsional vibrations by detecting and processing torsion angles to drive rotating members, enhancing stability and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If passive dampers are used for bridge vibration control, then horizontal and vertical vibrations can be mitigated, but torsional vibrations cannot be suppressed
Solution Approach 1:
The patent employs a rotating inertial mass that can dynamically adjust its orientation and rotation speed to generate counteracting torques. Unlike fixed passive dampers, this active system adapts its inertial properties in real-time to suppress torsional vibrations effectively
Solution Approach 2:
The invention introduces a rotational dimension to the vibration control mechanism. By rotating the inertial mass around the bridge axis, the system generates torque in the torsional dimension, whereas traditional dampers only operate in translational dimensions (horizontal and vertical)
2Stability of the object's composition
If dampers operate under high-frequency reciprocating motion, then vibration control is provided, but the damping fluid overheats and emulsifies
Solution Approach 1:
The patent replaces the fluid-based damping mechanism with a solid inertial mass system. The inertial mass generates control forces through its rotation and movement, eliminating the need for damping fluid and thus avoiding overheating and emulsification issues
Solution Approach 2:
The system changes the physical state from fluid-based damping to solid-based inertial control. By altering the fundamental parameter of the control medium from liquid to solid rotating mass, the thermal issues associated with high-frequency reciprocating motion are avoided
3Stability of the object's composition
If linear control force of dampers is applied for torsional vibration control, then some control effect is achieved, but chaotic phenomena occur under different excitation frequencies
Solution Approach 1:
The active control system dynamically adjusts the rotation speed and orientation of the inertial mass based on real-time vibration characteristics. This dynamic adaptation allows the system to maintain consistent control effectiveness across different excitation frequencies, avoiding the chaotic behavior of fixed linear dampers
Solution Approach 2:
The system incorporates feedback mechanisms to monitor bridge vibration and adjust the inertial mass control forces accordingly. This closed-loop control ensures reliable and consistent performance across varying excitation conditions, eliminating the chaotic phenomena observed in open-loop linear damper systems
4Stability of the object's composition
If tuned mass dampers are used, then displacement vibration is reduced, but rotational vibration modes cannot be suppressed
Solution Approach 1:
The invention introduces rotational motion of the inertial mass around the bridge axis, adding a torsional dimension to the control capability. This allows the system to suppress rotational vibration modes that traditional translational tuned mass dampers cannot address
Solution Approach 2:
The rotating inertial mass system serves multiple functions: it can suppress both translational and rotational vibration modes. By making the control system multi-functional, it simultaneously addresses displacement vibrations and torsional vibrations that single-function dampers cannot handle
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 system effectively suppresses torsional vibrations with improved precision and real-time responsiveness, ensuring energy-saving and stable bridge operation.
Implementation Method 1
an elastic reset member; the elastic reset member is sleevedly arranged on the first rotating shaft; a first end of the elastic reset member is connected to the to-be-controlled object, and a second end of the elastic reset member is connected to the first rotating member
Data Source
AI summary
An active-passive hybrid control system for rotational torque includes a first rotating shaft, an elastic reset member, a first rotating member, a first motor, a second rotating member, a sensor and a controller. The first rotating shaft is rotatably arranged on a to-be-controlled object. The elastic reset member is sleevedly arranged on the first rotating shaft. The first rotating member is arranged on the first rotating shaft. A first end of the elastic reset member is connected to the to-be-controlled object, and a second end of the elastic reset member is connected to the first rotating member. The first motor is provided on a side of the first rotating member away from the first rotating shaft. The second rotating member is arranged on the first motor. The controller is connected to the sensor and the first motor.