Modular Shaking Table With Segmented Actuators
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Solution Overview
Problem
Traditional shaking table systems face challenges in simultaneously achieving large worktop size, high load-carrying ability, and high-frequency loading, making it difficult to conduct large-scale engineering earthquake simulation tests for water control projects.
Innovation Solution
A modular shaking table test device with a shaking table body and excitation platform, utilizing long-stroke and short-stroke servo actuators connected to a motion controller, and isolation layers, allowing for adjustable frequency and area, with a worktop area greater than 250 m² and 50 m² respectively, and capable of long-stroke low-frequency and short-stroke high-frequency loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If traditional shaking table systems use large worktop size and long loading stroke, then load-carrying ability is improved, but high-frequency loading capability deteriorates
Solution Approach 1:
The shaking table system is divided into two independent subsystems: a large worktop shaking table for low-frequency, high-load tests and a small worktop excitation platform for high-frequency tests. Each subsystem has its own servo actuators optimized for its specific frequency range, allowing both low-frequency and high-frequency loading capabilities to coexist without compromising either performance characteristic.
2Speed
If shaking table system is designed for high-frequency loading, then loading frequency is improved, but worktop size and load-carrying ability deteriorate
Solution Approach 1:
The system separates high-frequency and low-frequency functions onto different platforms. The excitation platform with area greater than 50 m² handles high-frequency tests (greater than 40 Hz), while the main shaking table body with area greater than 250 m² handles low-frequency, high-load tests. This segmentation allows each platform to be optimized for its specific frequency range without compromising the other.
3Length of moving object
If shaking table system uses long loading stroke, then displacement capacity is improved, but high-frequency loading capability deteriorates
Solution Approach 1:
The system divides displacement and frequency functions between two subsystems. The shaking table body provides long-stroke low-frequency loading capability while the excitation platform provides short-stroke high-frequency loading capability. The stroke ratio between long-stroke and short-stroke servo actuators is at least 40:1, enabling each subsystem to operate within its optimal stroke and frequency range.
4Area of stationary object
If shaking table system is designed for large-scale tests, then test scale is improved, but test frequency range deteriorates
Solution Approach 1:
The system achieves extended frequency coverage by segmenting the test capabilities across two platforms. The shaking table body covers low-frequency ranges with long stroke, while the excitation platform covers high-frequency ranges with short stroke. This segmentation allows the overall system to achieve both large-scale testing capability and wide frequency adjustment range (from low-frequency to greater than 40 Hz).
Solution Approach 2:
The modular design with two independently controllable platforms provides multi-functionality, allowing the system to adapt to different test requirements. The motion controller can independently control both platforms, enabling the system to perform either low-frequency large-displacement tests or high-frequency small-displacement tests, or potentially coordinated tests utilizing both platforms simultaneously.
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
Enables large-scale and heavy-load engineering earthquake simulation tests with a wider frequency adjustment range, providing a larger worktop area and meeting the requirements for long stroke and high-frequency loading, enhancing the capability for earthquake simulation tests.
Implementation Method 1
both the short-stroke servo actuators and the long-stroke servo actuators consist of hydraulic servo actuators
Implementation Method 2
a plurality of isolation layers, which are arranged alternately to the short-stroke servo actuators, are arranged on the bottom side of the excitation platform
Data Source
AI summary
The present invention relates to a modular shaking table with heavy load capacity and extensible test frequency and area, comprising a shaking table body; the shaking table body is arranged in a building foundation in which a long-stroke groove is formed, long-stroke servo actuators are horizontally and vertically hinged in the modular shaking table; and an integration foundation is fixedly arranged on the upper end face of the shaking table body; an excitation platform is arranged in a short-stroke groove that is formed in the integration foundation, short-stroke servo actuators are horizontally and vertically hinged in the modular shaking table. The present invention is aimed at providing a large-scale and heavy-load modular shaking table that can meet the test requirements of realizing long stroke and high-frequency loading.