Magnetorheological Vibration Isolator for Quasi-Zero Stiffness Control
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Solution Overview
Problem
Traditional quasi-zero stiffness isolators fail to adapt to changes in load, losing their quasi-zero stiffness equilibrium state, which compromises their load-bearing capacity and vibration isolation effectiveness.
Innovation Solution
An intelligent vibration isolator with a magnetorheological elastomer and electromagnet system, controlled by a strain detection device and PID algorithm, adjusts current magnitude to maintain quasi-zero stiffness equilibrium by altering the stiffness characteristics of the magnetorheological elastomer in response to load changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the natural frequency is reduced to broaden the vibration isolation frequency band, then the vibration isolation frequency band is broadened, but the stiffness decreases, thereby reducing the load-bearing capacity of the system
Solution Approach 1:
The patent employs a magnetorheological elastomer whose stiffness can be dynamically adjusted by changing the current magnitude applied to the electromagnet. This allows the system to change its natural frequency and stiffness parameters in real-time, enabling broad vibration isolation frequency band while maintaining sufficient load-bearing capacity through active parameter adjustment rather than fixed design
Solution Approach 2:
The system transitions from a static stiffness design to a dynamic stiffness adjustment mechanism. The controller continuously monitors the system state and adjusts the electromagnet current to maintain optimal stiffness characteristics, enabling the system to adapt its natural frequency dynamically while preserving load-bearing capacity across varying operating conditions
2Strength
If a traditional quasi-zero stiffness isolator is used to achieve high static and low dynamic stiffness, then load-bearing capacity and vibration isolation are balanced, but the isolator cannot restore to quasi-zero stiffness state when load changes, resulting in poor adaptability
Solution Approach 1:
The system incorporates a strain detection device that continuously monitors the deformation state of the magnetorheological elastomer and feeds this information back to the controller. Based on the feedback signal, the controller adjusts the electromagnet current to maintain the quasi-zero stiffness equilibrium state even when load changes occur, enabling the isolator to restore and maintain its optimal stiffness characteristics dynamically
Solution Approach 2:
The patent transforms the static quasi-zero stiffness design into a dynamic system that can actively adjust its stiffness characteristics. The electromagnet current is modulated in real-time based on load conditions, allowing the isolator to maintain the quasi-zero stiffness state adaptively across varying loads rather than being fixed at a single operating point
3Adaptability or versatility
If an intelligent vibration isolator with real-time control is implemented to maintain quasi-zero stiffness equilibrium, then adaptability to load changes is improved, but the device complexity increases due to additional control systems
Solution Approach 1:
The system uses a strain detection device to monitor the deformation of the magnetorheological elastomer and provides feedback to the controller. This feedback mechanism enables automatic adjustment of the electromagnet current to maintain quasi-zero stiffness equilibrium, achieving high adaptability through a relatively simple feedback loop that directly couples sensing and actuation without complex control algorithms
Solution Approach 2:
The system exhibits self-regulating behavior where the strain detection device automatically detects deviations from the equilibrium state and the controller autonomously adjusts the electromagnet current to restore the quasi-zero stiffness condition. This self-service capability reduces the need for external intervention and complex control logic, achieving adaptability through inherent system feedback mechanisms
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
Ensures the isolator consistently maintains quasi-zero stiffness equilibrium, balancing load-bearing capacity and vibration isolation performance by real-time adjustment of stiffness, enhancing adaptability and responsiveness.
Implementation Method 1
a variable positive stiffness mechanism, which is connected in parallel to the negative stiffness mechanisms to form a quasi-zero stiffness system of the intelligent vibration isolator
Implementation Method 2
The controller adjusts and controls a magnitude of current of the electromagnet in real time according to the received strain magnitude to control vertical stiffness of the intelligent vibration isolator
Data Source
AI summary
Disclosed are an intelligent vibration isolator and a control method thereof. The intelligent vibration isolator includes a base, a vibration isolation mechanism disposed inside the base, and a controller; the base includes a bottom plate and a supporting sleeve disposed on the bottom plate; the vibration isolation mechanism includes a load platform, a supporting platform, a magnetorheological elastomer and an electromagnet which are sequentially and coaxially disposed from top to bottom; the vibration isolation mechanism is provided with at least three negative stiffness mechanisms that are uniformly distributed in a circumferential direction of the supporting platform; a strain detection device is disposed on an outer wall of the magnetorheological elastomer; and the controller adjusts and controls a magnitude of current of the electromagnet according to a received strain magnitude to control vertical stiffness of the isolator, and make the intelligent vibration isolator always be in a quasi-zero stiffness state.