Two-Stage Vibration Isolation Structure for Accurate IMU Measurement
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Solution Overview
Problem
Existing inertial measurement units (IMUs) face challenges in accurately detecting measurement data due to external vibrations that are not from the detection target, and current vibration insulating structures lack optimization for resonant frequency and amplitude amplification factor.
Innovation Solution
A vibration insulating structure comprising a first and second mass body supported by corresponding vibration insulating members, with a second structure ratio larger than the first, optimized using a method that involves obtaining unit parameters from a database, generating reference parameters, and calculating quantities for the second mass body and vibration insulating member to achieve desired resonant frequency and amplitude amplification factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a vibration insulating structure is provided to prevent external vibration from propagating to the sensor unit, then measurement accuracy is improved, but the structure requires optimization of resonant frequency and amplitude amplification factor which increases design complexity
Solution Approach 1:
The patent applies parameter changes by systematically varying the resonant frequency and amplitude amplification factor of the vibration insulating structure. By adjusting these parameters through different structural configurations and materials, the patent optimizes vibration insulation performance to achieve accurate measurement data while managing design complexity through methodical parameter exploration.
Solution Approach 2:
The patent employs dynamics by analyzing the dynamic characteristics of the vibration insulating structure, including resonant frequency and amplitude amplification factor. Through dynamic analysis and optimization of these time-varying parameters, the patent achieves effective vibration insulation while maintaining manageable design complexity through systematic dynamic characterization.
2Reliability
If the vibration insulating structure is optimized considering resonant frequency and amplitude amplification factor, then vibration insulating performance is improved, but manufacturing time and cost increase
Solution Approach 1:
The patent applies preliminary action by pre-determining optimal resonant frequency and amplitude amplification factor values through theoretical analysis and experimentation. By establishing these optimal parameters in advance, the patent enables direct manufacturing without requiring time-consuming iterative adjustments, thus improving vibration insulating performance while reducing manufacturing time.
Solution Approach 2:
The patent employs this principle by using standard, readily available materials and components for the vibration insulating structure that can be manufactured quickly without requiring specialized or expensive materials. This approach achieves sufficient vibration insulating performance through proper structural design and parameter optimization rather than relying on costly proprietary materials.
3Productivity
If a simple vibration insulating structure is used, then manufacturing cost and time are reduced, but insufficient vibration insulating performance results
Solution Approach 1:
The patent applies parameter changes by systematically adjusting key parameters such as resonant frequency and amplitude amplification factor to achieve optimal vibration insulating performance. By varying these parameters within practical ranges using standard materials and manufacturing processes, the patent attains high reliability without requiring complex or time-consuming manufacturing procedures.
Solution Approach 2:
The patent employs local quality by focusing optimization efforts on specific critical parameters and structural regions that have the greatest impact on vibration insulating performance. Rather than uniformly complicating the entire structure, the patent applies targeted modifications to key areas, achieving high reliability while maintaining manufacturing efficiency.
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
The proposed solution effectively reduces the impact of external vibrations on IMUs by optimizing the vibration insulating structure's characteristics, leading to improved measurement accuracy and cost reduction in design and manufacturing time.
Implementation Method 1
Vibration insulating members such as gel bushings are provided between the first substrate and the second substrate to prevent external vibration from propagating to the sensor unit
Data Source
AI summary
A vibration insulating structure is fixed to a vibration source and on which a measurement apparatus is placed, the vibration insulating structure including: a first vibration insulating structure fixed to the vibration source and a second vibration insulating structure provided on top of the first vibration insulating structure, in which the first vibration insulating structure includes a first mass body and a first vibration insulating member supporting the first mass body, the second vibration insulating structure includes a second mass body and a second vibration insulating member supporting the second mass body, the measurement apparatus is placed on the second mass body, and a second structure ratio of the second vibration insulating structure is larger than a first structure ratio of the first vibration insulating structure.