Damping Test System for Wood-Based Materials Using Full Vibration Curve Sampling
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Solution Overview
Problem
Conventional methods for measuring damping properties of wood-based materials are inaccurate due to incomplete sampling of free vibration curves, ignoring information from all sampling points and being affected by sensor coupling, material irregularities, and electrical noise.
Innovation Solution
A damping test system that fully samples the free vibration curve of wood-based materials using a single degree of freedom system, incorporating a viscoelasticity test module, force application module, and data monitoring module, which adjusts sampling frequency and test parameters to accurately determine damping ratios through logarithmic attenuation analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the conventional time-domain attenuation method uses only a portion of amplitude peaks to calculate damping properties, then the calculation process is simplified, but the measurement precision deteriorates because information from all sampling points is ignored
Solution Approach 1:
The patent applies continuous sampling throughout the entire free vibration curve rather than discrete peak point sampling. The data acquisition system continuously records vibration data at all sampling points from initial excitation through decay to rest, ensuring no damping information is lost. This continuous approach captures the complete vibration history, enabling more accurate damping calculation while maintaining operational feasibility through automated processing.
2Measurement precision
If the sampling rate is increased to improve amplitude accuracy, then the obtained amplitude is closer to the actual amplitude, but the device complexity and data processing burden increase
Solution Approach 1:
The patent optimizes the sampling rate parameter to achieve an effective balance between measurement accuracy and system complexity. Rather than using excessively high sampling rates that would complicate the system, the sampling rate is carefully selected to satisfy the Nyquist criterion for the vibration frequencies of interest while capturing sufficient detail for accurate damping calculation. This parameter optimization reduces data volume and processing requirements while maintaining amplitude measurement precision.
3Measurement precision
If full sampling of the free vibration curve is implemented, then the damping properties measurement accuracy is improved, but the data processing time and computational requirements increase
Solution Approach 1:
The patent extracts only the essential damping information from the complete vibration dataset through targeted analysis methods. Rather than processing all raw data points equally, the system identifies and extracts the logarithmic decay envelope from the vibration signal, focusing computational effort on the amplitude decay characteristics. This extraction approach maintains high measurement accuracy by preserving all damping-relevant information while significantly reducing processing time through selective analysis of the decay portion of the vibration curve.
Solution Approach 2:
The patent replaces complex manual or iterative analysis methods with direct mathematical computation of the logarithmic attenuation rate. By substituting traditional peak-comparison methods with a continuous logarithmic decay analysis of all sampling points, the system achieves more accurate damping measurement through a computationally efficient formula that processes the full dataset in a single calculation pass, minimizing processing time despite using complete sampling data.
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 system provides more accurate and reliable measurements of damping properties by utilizing all sample points, reducing errors and enhancing the comprehensive reflection of damping characteristics without requiring initial conditions.
Implementation Method 1
sampling a free vibration of a wood-based material arranged on a predetermined model in a vibration direction to obtain monitoring data
Implementation Method 2
determine, based on the test data, whether the extended test is added... determine a test parameter of a newly added extended test... generate, based on the test parameter of the newly added extended test and an adjusted sampling frequency, a new test scheme
Data Source
AI summary
Disclosed is a damping test system for a wood-based material based on full sampling of a free vibration curve, comprising: a damping test device, a carrying space, a processor, and a storage module. The processor is configured to generate a test scheme and execute a test corresponding to the test scheme; obtain a labeled test scheme; determine, based on the labeled test scheme, test data of the labeled test scheme; determine, based on the test data, whether an extended test is added; in response to determining that the extended test is added, adjust, based on the test data obtained from the storage module, a sampling frequency of a data monitoring module, and determine a test parameter of a newly added extended test; generate, based on the test parameter of the newly added extended test and an adjusted sampling frequency, a new test scheme.