Adaptive Compensator for Dynamic Resonance Attenuation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Aircraft-based systems with mechanical structures face challenges in predicting resonating frequencies, leading to inadequate attenuation by notch filters, resulting in unwanted oscillations.

Innovation Solution

A control system dynamically sets the parameter of an adaptive compensator using a filtering unit with multiple frequency filters to identify and average resonating frequencies, allowing for real-time adjustment of the adaptive filter to attenuate variable frequencies.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a notch filter is designed for a given frequency, then it can attenuate that specific frequency, but it becomes inadequate when the resonating frequency varies dynamically

Engineering Contradiction:

Improveattenuation effectivenessVSAvoidfrequency range coverage

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent implements dynamic frequency detection and adaptive filter parameter adjustment. The system continuously monitors the resonating structure's frequency characteristics and automatically adjusts the notch filter's center frequency and bandwidth parameters in real-time, transforming a static filter into a dynamic adaptive system that tracks varying resonant frequencies

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the parameters of the notch filter (center frequency, bandwidth, attenuation depth) based on detected resonating frequencies. By dynamically modifying these parameters rather than using fixed values, the filter maintains effectiveness across varying operational conditions and frequency ranges

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If multiple frequency filters are used to cover a broader range, then frequency coverage improves, but system complexity increases

Engineering Contradiction:

Improvefrequency detection rangeVSAvoidfiltering unit structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The frequency detection range is divided into multiple discrete frequency bins or channels, each handled by a dedicated filter element. This segmentation allows the system to cover a broad frequency range while maintaining simple, modular processing for each frequency component, avoiding the complexity of a single complex wideband filter

Inventive Principle:

Principle #1Segmentation

3Measurement precision

If real-time frequency detection is implemented, then dynamic attenuation accuracy improves, but computational requirements and processing time increase

Engineering Contradiction:

Improveresonating frequency detection accuracyVSAvoidprocessing delay

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The system pre-calculates and stores frequency bin boundaries, filter parameters, and lookup tables for common frequency scenarios. This preliminary preparation allows the real-time detection algorithm to quickly compare measured frequencies against pre-computed values, reducing computational burden and processing delay during actual operation

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP2801878B1Dynamically detecting resonating frequencies of resonating structures

Publication Date: 2020.03.11 PRATT & WHITNEY CANADA CORP

Figure 1A
Figure 1B
Figure 2

AI summary

There is described herein a real-time scheme, implementable in software, hardware, or a combination thereof, to detect a resonating frequency of a structure from a sensed signal and dynamically set the center frequency of an adaptive compensator (306) for effective attenuation of the resonating frequency.