Mode-Shaped Components for Critical Vibration Resistance
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Solution Overview
Problem
In rotating machinery, such as gas turbine engines, vibrations caused by imbalances and external forces are challenging to control, particularly at critical speeds, leading to resonance and structural fatigue, with existing damping systems often being heavy and inefficient.
Innovation Solution
A method involving the design and manufacturing of components based on mode shapes, where the geometry and stiffness distribution are adapted to disrupt critical vibrations by aligning with non-critical mode shapes, reducing vibrations and weight through Finite Element Modal Analysis and redesigning the component's geometry and mass distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If damping systems are designed to reduce vibrations at critical speeds, then vibration control is improved, but the weight of the system increases
Solution Approach 1:
The patent applies preliminary action by designing the component geometry to follow mode shape patterns before the component is subjected to vibrational loads. By pre-shaping the stiffness distribution according to mode shapes during the design phase, the component inherently resists vibrations when operated, eliminating the need for additional heavy damping systems.
Solution Approach 2:
The patent implements local quality by varying the stiffness distribution locally throughout the component according to mode shape patterns. Different regions of the component have different stiffness characteristics that correspond to the mode shape deformation patterns, allowing targeted vibration control at specific locations without uniformly increasing the entire component's weight.
2Object-affected harmful factors
If traditional damping systems are used to control vibrations, then vibration reduction is achieved, but the device complexity increases
Solution Approach 1:
The patent merges the vibration control function directly into the component's structural geometry rather than using separate damping systems. The mode shape-based geometry design integrates stiffness distribution that inherently controls vibrations, combining the structural support function and vibration control function into a single unified component design.
Solution Approach 2:
The component performs self-service by using its own geometric design to control its vibrations. The mode shape-based stiffness distribution enables the component to inherently resist vibrational modes without requiring external damping devices or active control systems, making the component self-regulating against vibrations.
3Object-affected harmful factors
If component geometry is adapted to mode shapes, then vibration control is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by modifying the geometric parameters of the component (such as thickness, cross-sectional area, or contour) to follow mode shape patterns. These parameter variations are implemented in the component's geometry to create the desired stiffness distribution, and can be manufactured using conventional techniques by adjusting dimensional parameters during the design and manufacturing process.
Data Source
AI summary
Embodiments of the invention are shown in the figures, where a method is presented for designing a component, including designing or receiving a model of the component; determining at least one mode shape of at least a portion of the model; redesigning the model based on the determined at least one mode shape to obtain a redesigned model of the component; and manufacturing the component in accordance with the redesigned model.