Torque-Drive Rotating Assembly for Bridge Torsional Vibration Control
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Solution Overview
Problem
Existing bridge dampers are ineffective in controlling torsional vibration, prone to failure, and unstable at high temperatures, leading to potential bridge collapse.
Innovation Solution
A torque-drive active control system using a motor, rotating shaft, sensor, and controller to detect and generate a torque opposing torsional vibration, improving stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a damper is used for passive vibration control, then horizontal and vertical vibrations can be controlled, but torsional vibration cannot be controlled
Solution Approach 1:
The patent transforms the static damper into a dynamic active control system with motors that can generate rotational torque. The system dynamically adjusts the control force direction and magnitude based on real-time sensor feedback, enabling it to handle both linear and rotational vibrations adaptively.
Solution Approach 2:
The active control system integrates multiple functions into a single device: it can control horizontal vibration, vertical vibration, and torsional vibration simultaneously. The motor-driven mechanism provides both linear damping force and rotational torque, making the system universally applicable to various vibration modes.
2Reliability
If a damper operates under high-frequency reciprocating motion at high temperature, then vibration control is achieved, but the internal damping fluid emulsifies making control performance unstable
Solution Approach 1:
The patent replaces the passive mechanical damping fluid system with an active motor-driven system. Instead of relying on fluid viscosity that degrades at high temperatures, the system uses electric motors to generate control forces, eliminating the emulsification problem entirely.
Solution Approach 2:
The system changes the fundamental operating parameter from passive fluid-based damping to active motor-based force generation. This parameter change allows the system to operate stably across a wide temperature range without the limitations of fluid properties.
3Device complexity
If a tuned mass damper is used for vibration control, then simple structure is achieved, but it cannot control vibration involving rotation characteristics
Solution Approach 1:
The patent introduces dynamic rotational capability to the control system through motors that can generate torque. This transforms the static mass damper concept into a dynamic system that actively produces both linear and rotational control forces as needed.
Solution Approach 2:
The system adds the rotational dimension to the traditional linear vibration control. By incorporating motor-driven rotation, the system can address torsional vibrations and coupled rotation-displacement vibrations that pure translational mass dampers cannot handle.
4Device complexity
If a damper outputs linear control force, then simple control mechanism is achieved, but chaos phenomenon occurs when controlling torsional vibration
Solution Approach 1:
The patent makes the control mechanism dynamic by introducing motor-driven rotation capability. The system can adaptively switch between linear force output and rotational torque output based on the vibration mode, preventing chaos phenomenon in torsional vibration control.
Solution Approach 2:
The system changes the control parameter from purely linear force to include rotational torque. This parameter expansion allows the control mechanism to effectively address torsional vibrations without causing chaotic behavior.
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
Effectively offsets torsional vibration, enhancing bridge stability and reducing the risk of collapse.
Implementation Method 1
a first motor; a first rotating shaft... the first motor is drivably connected with the first rotating shaft
Implementation Method 2
the sensor is configured to detect a torsion angle of the to-be-controlled object and transmit the torsion angle to the controller
Implementation Method 3
the first rotating shaft drives the rotating assembly to rotate... so that the rotating assembly generates a torque
Data Source
AI summary
A torque-drive active control system based on principle of rotation includes a first motor, a first rotating shaft, a rotating assembly, a sensor and a controller. The first motor is arranged on a to-be-controlled object. The first rotating shaft is rotatably arranged on the to-be-controlled object. The rotating assembly is arranged on the first rotating shaft. The first motor is drivably connected with the first rotating shaft. The sensor is configured to monitor a torsional angle of the to-be-controlled object, and the controller is configured to process the torsional angle and output instructions to control the first motor to drive the first rotating shaft, so that the first rotating shaft drives the rotating assembly to rotate to generate a torque. The torque is transmitted to the to-be-controlled object through the first rotating shaft to offset the torsional vibration of the to-be-controlled object.