MIMO Vibration Control Using Modified Reference Specifications

Solution Overview

Problem

Current MIMO vibration control systems for acoustic and mechanical testing often fail to match predetermined reference specifications due to real-world constraints, leading to excessive system drive power, potential damage, and unreliable test results, as they ignore limitations of the test system and facility.

Innovation Solution

The implementation of a MIMO control system that uses a modified reference specification based on actual system performance and limitations, created through data acquisition and iterative feedback, to adjust drive signals and reduce the risk of damage while maintaining closer correspondence to the initial reference specification with less required system drive power.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional MIMO control systems use predetermined reference specifications without modification, then the system attempts to meet the specified test parameters, but the system drive power exceeds capabilities and components may be damaged

Engineering Contradiction:

Improvetest result reliabilityVSAvoidsystem drive power

Core Design Contradiction:

ReliabilityVSPower

Solution Approach 1:

The system performs preliminary characterization of the test facility and system limitations before actual testing. A modified reference specification is created in advance that incorporates known system constraints, preventing excessive drive power demands before they occur during the test.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system uses feedback from system performance data and measured limitations to iteratively refine the reference specification. This feedback loop ensures that the final specification is realistic and achievable within system capabilities, preventing power overload while maintaining test validity.

Inventive Principle:

Principle #23Feedback

2Manufacturing precision

If conventional MIMO control systems ignore real-world constraints, then the reference specification remains ideal, but the actual test response fails to meet specifications

Engineering Contradiction:

Improvetest specification conformityVSAvoidsystem capability adaptation

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The system modifies parameters of the reference specification based on measured system characteristics and facility limitations. By adjusting spectral density values and coherence requirements to match actual system capabilities, the specification becomes both achievable and scientifically valid.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the system operates without modified reference specification, then the initial specification is maintained, but excessive drive power is required leading to potential damage

Engineering Contradiction:

Improvesystem component safetyVSAvoidsystem drive power consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The system performs preliminary characterization of the test facility and system limitations before actual testing. A modified reference specification is created in advance that incorporates known system constraints, preventing excessive drive power demands before they occur during the test.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system uses feedback from system performance data and measured limitations to iteratively refine the reference specification. This feedback loop ensures that the final specification is realistic and achievable within system capabilities, preventing power overload while maintaining test validity.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS11703415B2High intensity vibration testing using an empirically modified reference specification and method thereof

Publication Date: 2023.07.18 UNDERWOOD MARCOS

AI summary

An acoustic or mechanical vibration testing system includes a MIMO control system coupled to at least two separately controllable groups of vibration transducers and at least two control sensor transducers wherein the number of control sensor transducers need not be equal to the number of controller output drives or number of separately controllable groups of vibration transducers. The MIMO control system utilizes both a predetermined initial reference specification and a modified reference specification, wherein data acquired during system operation under conventional MIMO control is used to create the modified reference specification based on actual system performance and limitations thereof so as to maintain closer correspondence to the predetermined initial reference specification with less required system drive power, as a function of the predetermined initial reference, and less risk of damage to the test system and the test article during the performance of a test.