Vibratory Plate Compaction with Feedback Control for Rammed Earth
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Solution Overview
Problem
Existing methods for compacting rammed earth are limited by the weight of vibratory plates, requiring heavy machinery for high compaction, lack precision in determining compaction, and result in inefficient, multi-layered construction processes due to shallow compaction depth and indirect quality assessment.
Innovation Solution
A method combining a vibratory plate with a three-axis positioning system for precise control of pressure, frequency, and amplitude, using sensors to measure and adjust compaction parameters in real-time, enabling high compaction pressure and depth independently of plate weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If heavy vibratory plate compactors are used to achieve high compaction pressure, then compaction pressure is improved, but ease of operation deteriorates due to difficulty in handling
Solution Approach 1:
The patent applies the anti-weight principle by using a hydraulic lifting system to counterbalance the weight of the vibratory plate compactor. The hydraulic cylinder provides an upward force that offsets the gravitational force on the heavy plate, making the equipment easy to lift, move, and position despite its substantial weight (40-1200 kg). This allows operators to handle heavy compactors with minimal effort while maintaining the high compaction pressure capability.
2Ease of operation
If lightweight vibratory plates are used for accessibility, then ease of operation is improved, but compaction pressure deteriorates
Solution Approach 1:
The patent applies the dynamics principle by making the compaction system adaptable through hydraulic pressure control. Instead of relying on the static weight of the plate alone, the hydraulic lifting system dynamically adjusts and applies additional downward force to achieve the required compaction pressure (up to 30 kN or more). This allows lightweight plates to generate high compaction forces when needed, while remaining easy to handle when the hydraulic support is engaged.
3Productivity
If conventional vibratory plates are used for soil compaction, then productivity is improved for large areas, but manufacturing precision deteriorates for rammed earth compaction depth
Solution Approach 1:
The patent applies the feedback principle by incorporating sensors that monitor compaction parameters such as pressure, vibration amplitude, and soil density in real-time. This feedback is fed to a control system that automatically adjusts the hydraulic pressure and vibration settings to achieve the target compaction depth and density. For rammed earth construction, this ensures precise control over compaction depth and quality, preventing both under-compaction and over-compaction while maintaining efficient construction processes.
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 efficient, controlled, and repeatable compaction of rammed earth components with high compaction pressure and depth, allowing single-layer construction of thick structures and improved compaction quality across varying material compositions.
Implementation Method 1
Conventional vibratory plate compactors are suitable for producing rammed earth, but are primarily designed for soil compaction. These compactors operate via at least one unbalanced shaft driven by a motor. The vibration, transmitted to a base plate, generates centrifugal forces that produce the compaction effect
Implementation Method 2
The vibration, transmitted to a base plate, generates centrifugal forces that produce the compaction effect and often propel the plate forward
Implementation Method 3
the pressure force applied to the soil material is adjusted by controlling the positioning system to move it perpendicular to the plane of the vibratory plate
Data Source
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AI summary
In a method for the mechanical compaction of clayey soil material using a vibratory plate, in which the vibratory plate is guided as an end effector on a three-axis positioning system (9, 10) over the soil material to be compacted and the pressure force applied to the soil material is adjusted by controlling the positioning system (9, 10) to move it perpendicular to the plane of the vibratory plate, the degree of compaction of the soil material is measured during compaction and the pressure force, the duration of the vibratory plate remaining in the same place, the frequency of the vibration movement and/or the amplitude of the vibration movement are controlled depending on the measured degree of compaction.