Active Mass Damper Control for Floor Vibration Reduction
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Solution Overview
Problem
Modern civil structures, such as floors and footbridges, experience significant vertical vibrations due to human occupancy, leading to occupant discomfort and potential equipment degradation, necessitating effective vibration control solutions to enhance structural efficiency and reduce costs and carbon footprints.
Innovation Solution
An active mass damper device that measures instantaneous vibrations using an accelerometer, feeds the signal to a control unit, and drives an actuator to move a mass block, generating a force that cancels out vibrations, with features like motor types, CPU separation for task management, and network connectivity for data upload and fault reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an active mass damper device is implemented to reduce vibrations, then vibration control effectiveness is improved, but device complexity and cost increase
Solution Approach 1:
The control system is divided into multiple independent CPUs, each handling specific tasks. CPU1 manages time-critical control functions, CPU2 handles signal analysis, and CPU3 manages communication, allowing parallel processing and reducing complexity of individual components
Solution Approach 2:
A servo drive acts as an intermediary between the control CPUs and the linear motor, managing the complex power electronics and motor control functions, thereby simplifying the overall system architecture and reducing direct complexity
2Productivity
If multiple CPUs with separated tasks are used in the controller, then processing capability and reliability are improved, but device complexity increases
Solution Approach 1:
The controller is segmented into three independent CPUs with clearly defined functional boundaries. Each CPU operates autonomously for its specific task (time-critical control, signal analysis, communication), enabling parallel processing while maintaining manageable individual component complexity
Solution Approach 2:
Each CPU is designed to be a universal processing unit that can handle its designated tasks, allowing the system to achieve high processing capability through parallel operation of standardized components rather than highly specialized complex hardware
3Ease of repair
If ironless linear motors are used to drive the mass block, then maintenance requirements are minimized, but cost and device complexity increase
Solution Approach 1:
Traditional mechanical contact-based actuators are replaced with ironless linear motors that use electromagnetic fields for actuation. This substitution eliminates mechanical wear components, thereby minimizing maintenance requirements while the integrated motor design keeps complexity manageable
4Reliability
If the device is permanently connected to the internet for remote monitoring, then reliability and maintenance capability are improved, but security risks and device complexity increase
Solution Approach 1:
The device autonomously monitors its own performance, detects faults, and communicates status information through the network connection. This self-service capability improves reliability by enabling automatic fault detection and reporting without requiring additional manual monitoring systems
Solution Approach 2:
The network connection provides continuous feedback between the device and remote monitoring systems. Performance data and fault information are transmitted automatically, enabling real-time monitoring and proactive maintenance while using standardized communication protocols to manage complexity
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 reduces vibrations, minimizes maintenance requirements, and enhances structural efficiency, leading to cost savings and improved sustainability by autonomously managing vibrations and reporting performance data.
Implementation Method 1
measuring instantaneous vibrations using an accelerometer
Implementation Method 2
The actuator may comprise a motor, for example one or more iron core and/or one or more ironless motors
Implementation Method 3
the actuator moves a mass block, the inertia of which generates a force which acts in such a way as to cancel out or dampen vibrations
Data Source
AI summary
An active mass damper device for reducing vibrations is provided and comprises means for measuring instantaneous vibrations using an accelerometer, means for feeding this signal to a control unit and using this to drive an actuator. The actuator moves a mass block, the inertia of which generates a force which acts in such a way as to cancel out or dampen vibrations.