Active Torsional Vibration Control With Motor-Driven Rotating Plate

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Solution Overview

Problem

Existing passive control systems, such as dampers, fail to effectively address torsional vibrations in bridges, leading to instability and potential collapse due to their inability to control rotation-related vibrations and varying control effectiveness under different excitation frequencies.

Innovation Solution

An active control system comprising a first motor, rotating plate, sensor, and controller that detects torsional angles and generates counteracting torque through the rotating plate to suppress torsional vibrations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a passive control strategy using a damper is adopted, then horizontal and vertical vibrations can be controlled, but torsional vibrations cannot be controlled and may even be aggravated

Engineering Contradiction:

Improvebridge stabilityVSAvoidcontrol capability for different vibration types

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent transitions from a passive damper to an active control system with motors that can dynamically adjust control forces. The first motor can actively generate torque to counteract torsional vibrations, while the second motor adjusts the rotating plate's rotation speed dynamically, enabling the system to adapt to different vibration types and frequencies.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The control system is designed to handle multiple vibration types simultaneously. The first motor controls torsional vibrations through torque generation, while the second motor controls the rotating plate to address both torsional and translational vibrations, making the system universally applicable to various vibration modes.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Force

If a tuned mass damper is used, then control force is provided, but under certain excitation frequencies the control effect is lost and vibration may be aggravated

Engineering Contradiction:

Improvecontrol forceVSAvoidcontrol effectiveness under different excitation frequencies

Core Design Contradiction:

ForceVSAdaptability or versatility

Solution Approach 1:

The system uses active control motors that can dynamically adjust their output based on real-time vibration conditions. The controller processes sensor data and adjusts the motor commands to maintain effectiveness across different excitation frequencies, eliminating the frequency limitations of passive tuned mass dampers.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The control system incorporates sensors that detect vibration characteristics and feed this information back to the controller. The controller then adjusts the motor commands in real-time based on the feedback, ensuring continuous adaptability to changing excitation frequencies and maintaining control effectiveness.

Inventive Principle:

Principle #23Feedback

3Force

If a damper is used for vibration control, then linear control force is generated, but chaos phenomenon occurs when controlling torsional vibration

Engineering Contradiction:

Improvecontrol forceVSAvoidcontrol stability for torsional vibration

Core Design Contradiction:

ForceVSStability of the object's composition

Solution Approach 1:

The patent replaces the passive mechanical damper system with an active electromechanical control system. Motors driven by electronic controllers generate control forces, eliminating the chaotic behavior inherent in passive mechanical systems while providing stable and controllable torque for torsional vibration suppression.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 active control system effectively counteracts torsional vibrations, improving the stability of bridges by generating torque that directly opposes the torsional motion, enhancing stability and responsiveness.

Implementation Method 1

the sensor is configured to detect a torsional angle of the to-be-controlled object and send the torsional angle to the controller

Methodology Applied

Scientific EffectTorsional angle detection:

Implementation Method 2

the controller is configured to control the first motor to drive the rotating plate to rotate

Methodology Applied

Scientific EffectElectromagnetic conversion:

Implementation Method 3

generating torque that counteracts the torsional vibration of the to-be-controlled object

Methodology Applied

Scientific EffectTorque generation: Torque

Data Source

PatentUS20250250751A1Active control system for suppressing swing and sway behaviors of engineering structures or mechanical systems

Publication Date: 2025.08.07 SHENYANG UNIVERSITY OF TECHNOLOGY

AI summary

An active control system for suppressing swing and sway behaviors includes a first motor, a rotating plate, a sensor and a controller. The first motor is provided on a to-be-controlled object. The rotating plate is provided on the first motor. The controller is connected to the sensor and the first motor. The sensor is configured to detect a torsional angle of the to-be-controlled object and send the torsional angle to the controller. The controller is configured to process the torsional angle and output a control instruction to the first motor based on a processing result, so as to control the first motor to drive the rotating plate to rotate.