Road Intelligent Compaction Index Using Higher Harmonic Analysis
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Solution Overview
Problem
Traditional road compaction methods and quality testing methods are destructive, time-consuming, and limited in scope, while the harmonic ratio road intelligent compaction index used in intelligent compaction technology does not consider higher harmonics, leading to inaccurate calculations.
Innovation Solution
A method and system for calculating a road intelligent compaction index using periodic truncation and noise reduction of acceleration signals from a vibratory roller, incorporating Fourier transforms and specific amplitude calculations to account for fundamental and higher harmonics, with a machine-material decoupling control index as a precondition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the traditional harmonic ratio road intelligent compaction index is used without considering higher harmonics, then the calculation is simpler, but the measurement precision deteriorates
Solution Approach 1:
The patent segments the acceleration signal into multiple frequency components through Fourier transform, separating the fundamental frequency from higher harmonics. This allows selective analysis of different frequency components to improve measurement precision while managing computational complexity through structured signal decomposition
Solution Approach 2:
The patent changes the parameter set used in the harmonic ratio calculation by incorporating higher harmonic components (2Ω, 3Ω, 4Ω, 5Ω) in addition to the fundamental frequency (Ω). This parameter expansion improves the accuracy of compaction quality assessment by capturing more comprehensive vibration characteristics
2Measurement precision
If non-integral period acceleration signals are used directly for calculation, then the processing is faster, but the measurement precision deteriorates
Solution Approach 1:
The patent performs preliminary periodic truncation processing on the acceleration signal before harmonic ratio calculation. By pre-processing the signal to ensure integral period segmentation and applying noise reduction filters beforehand, the subsequent calculation achieves higher precision without requiring excessive processing time during the main computation phase
3Measurement precision
If the acceleration signal is truncated and noise reduction processing is performed, then the measurement precision is improved, but the productivity deteriorates
Solution Approach 1:
The patent applies periodic truncation to the acceleration signal, dividing it into regular one-second intervals. This periodic structure enables efficient batch processing and systematic noise reduction, improving measurement precision while maintaining computational efficiency through standardized, repeatable processing cycles
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 approach provides a more accurate and stable road intelligent compaction index, improving the precision of compaction quality assessment and control by considering higher harmonics and ensuring effective signal screening and analysis.
Implementation Method 1
mounting an acceleration sensing apparatus on a vibration wheel of a vibratory roller
Implementation Method 2
performing Fourier transform on the truncated signal to obtain a transformed signal
Data Source
AI summary
A method and system for detecting road intelligent compaction index, so as to solve the problem of inaccurate use of a road intelligent compaction index due to the fact that existing harmonic ratio indexes do not consider the influence of a non-integral period on the accuracy and also do not consider a higher harmonic. According to the disclosure, a relative relationship between amplitudes of the higher harmonic and a fundamental wave in an acceleration time domain signal is considered based on the related art, the amplitude of the higher harmonic is introduced into a main body road intelligent compaction index of an road intelligent compaction index, and a precondition for the use of the road intelligent compaction index of the main body is established, that is, a machine-material decoupling control the machine-material decoupling control index.