Adaptive Three-Parameter Isolator With External MR Valve
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Solution Overview
Problem
Conventional passive three parameter isolators are limited in their ability to dynamically adjust damping and stiffness characteristics, which can lead to suboptimal performance across varying operational frequencies and environments, such as during satellite launch and in-orbit operations.
Innovation Solution
The integration of an external Magneto-Rheological (MR) valve with a three parameter isolator, allowing for adaptive tuning of damping fluid viscosity through a control device that adjusts the magnetic field strength, enabling dynamic stiffness and damping adjustments in response to operational conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If passive three parameter isolators are tuned to provide optimal damping at a specific frequency, then damping performance is improved at that frequency, but damping performance deteriorates at other operational frequencies and critical modes
Solution Approach 1:
The patent applies dynamics by transitioning from a static, passive isolator system to a dynamic, active system. Magneto-rheological valves are integrated into the three parameter isolator, allowing real-time adjustment of damping coefficients and stiffness characteristics. This enables the isolator to adapt its parameters dynamically to match varying operational frequencies and critical modes, resolving the contradiction between optimized performance at a specific frequency and adaptability across multiple frequencies.
Solution Approach 2:
The patent implements parameter changes by utilizing magneto-rheological fluid technology, which allows continuous adjustment of the damping fluid's viscosity and the isolator's stiffness through magnetic field control. By changing the rheological parameters of the fluid in response to detected vibrational characteristics, the system can optimize damping performance across a broad frequency range rather than being fixed at a single tuned frequency.
2Ease of manufacture
If the dynamic stiffness of a conventional three parameter isolator is fixed by design and damping fluid viscosity, then manufacturing simplicity is improved, but the ability to provide both soft in-orbit stiffness and high on-launch stiffness deteriorates
Solution Approach 1:
The patent resolves this contradiction by incorporating magneto-rheological fluid into the isolator's damping mechanism. The fluid's viscosity can be dynamically changed through magnetic field application, allowing the same isolator design to provide high stiffness during launch (when magnetic fields are applied) and soft stiffness during in-orbit operations (when magnetic fields are reduced or eliminated). This maintains manufacturing simplicity while achieving adaptive stiffness characteristics.
Solution Approach 2:
The patent substitutes traditional mechanical stiffness adjustment mechanisms with a magnetic field-based control system. Instead of requiring multiple isolator designs or complex mechanical adjustment mechanisms, the system uses magnetic fields to control the rheological properties of the damping fluid, thereby adjusting stiffness electronically rather than mechanically.
3Adaptability or versatility
If magneto-rheological valves are integrated with three parameter isolators for adaptive tuning, then adaptability and performance optimization are improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the magneto-rheological valve system to perform multiple functions: it controls both damping coefficients and stiffness characteristics, and can operate across various frequency ranges. This multi-functionality justifies the added complexity, as a single integrated system provides adaptive control capabilities that would otherwise require multiple separate components or systems.
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
This solution allows for real-time self-tuning of damping and stiffness characteristics, effectively addressing the limitations of conventional isolators by optimizing performance across a broad frequency range and varying operational conditions, including changes due to temperature and vibratory forces.
Implementation Method 1
The MR valve is externally positioned with respect to the three parameter isolator and is fluidly coupled between the opposing hydraulic chambers. The MR valve is configured to generate a magnetic field through which the MR damping fluid passes as the fluid flows between the opposing hydraulic chambers.
Implementation Method 2
A general control device is operably coupled to the MR valve and is configured to control the strength of the magnetic field to adjust the viscosity of the MR damping fluid during operation of the three parameter isolator.
Data Source
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AI summary
Embodiments of an adaptive three parameter isolator assembly (30) are provided, as are embodiments of a vehicle isolation system (130) including a plurality of isolator assemblies. In one embodiment, the isolator assembly includes a three parameter isolator (10) having opposing hydraulic chambers (44, 46) configured to be filled with a Magneto-Rheological (MR) damping fluid. An MR valve (34, 100) external to the three parameter isolator is fluidly coupled between the opposing hydraulic chambers. The MR valve is configured to generate a magnetic field through which the MR damping fluid passes as the fluid flows between the opposing hydraulic chambers. A control device (88) is operably coupled to the MR valve and is configured to control the strength of the magnetic field to adjust the viscosity of the MR damping fluid during operation of the three parameter isolator.