Damping Ratio Measuring Device for Consolidation Equipment
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Solution Overview
Problem
The measurement of damping ratio in geotechnical engineering is prone to uncertainty and inaccuracy, especially under low strain conditions, due to noise interference and near-field effects in traditional damping test methods, leading to significant measurement errors.
Innovation Solution
A damping ratio measuring device with a novel arrangement of signal transmitting and receiving sensors, including a bracket, consolidation pressure device, and sleeve, along with a signal processing method using frequency spectrum ratios to minimize noise and interference, ensuring accurate damping ratio measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the traditional damping test method using bending element sensors with close transmitting and receiving sources is used, then the test operation is simple and intuitive, but the near-field effect and noise interference cause significant measurement errors in damping ratio
Solution Approach 1:
The patent transitions from a horizontal sensor arrangement to a vertical arrangement along the consolidation pressure direction. The transmitting bending element sensor is placed at the bottom of the pressure device and the receiving sensor at the top, utilizing the vertical dimension to increase signal transmission distance while avoiding near-field effects and reducing noise interference.
Solution Approach 2:
The soil sample itself serves as an intermediary medium for signal transmission. Instead of direct close-proximity sensing, the vibration signal travels through the soil sample from the transmitting sensor at the bottom to the receiving sensor at the top, allowing measurement of damping characteristics through the material being tested.
2Device complexity
If the signal transmitting source and receiving source are placed close together, then the test setup is simple, but the near-field effect affects the accuracy of the received signal
Solution Approach 1:
The patent utilizes the vertical dimension along the consolidation pressure direction to separate the transmitting and receiving sensors. This spatial separation in the vertical direction eliminates the near-field effect while maintaining a relatively simple device structure, as the sensors are integrated into the existing consolidation pressure device topology.
3Ease of operation
If the received signal is captured along with noise signals by the receiving signal source, then the measurement process remains simple, but the measurement error of damping ratio increases significantly
Solution Approach 1:
The patent extracts the damping ratio measurement function from the general consolidation test by adding dedicated vibration transmitting and receiving sensors. This specialized sensor arrangement isolates the damping measurement capability, allowing it to be performed independently with higher accuracy while maintaining compatibility with the consolidation test framework.
Solution Approach 2:
The soil sample acts as an intermediary that transmits the vibration signal from the transmitting sensor to the receiving sensor. This intermediary transmission path allows the system to measure the soil's inherent damping characteristics by observing how the signal propagates through the material itself, rather than being directly coupled between sensors.
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 solution effectively reduces measurement errors by eliminating near-field effects and noise interference, enhancing the accuracy and reliability of damping ratio measurements in soil consolidation tests.
Implementation Method 1
the most commonly used method is the traditional damping test method, which calculates the damping characteristics by measuring the resonant vibration response curve of the measured object
Implementation Method 2
setting the consolidation pressure device at the top of the bracket, and the output direction of the consolidation pressure device is directly below, connecting the bottom of the consolidation pressure device with a pressurized piston
Data Source
AI summary
A damping ratio measuring device for consolidation equipment includes a bracket, a consolidation pressure device and a sleeve. The consolidation pressure device is set at the top of the bracket, and the output direction of the consolidation pressure device is directly below. The bottom of the consolidation pressure device is connected with a pressurized piston. A displacement sensor is set on the pressurized piston. The sleeve is set directly below the consolidation pressure device, the pressurized piston extends from the top of the sleeve, the diameter of the pressurized piston is the same as the inner diameter of the sleeve, the bottom of the sleeve is sealed with a support plate, and there are two bending element sensors at the top of the support plate and the bottom of the pressurized piston.