Construction Equipment Stabilization on Soft Subgrade
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Solution Overview
Problem
Construction equipment with a high center of gravity is at risk of tipping over on flexible and mechanically variable subsoil, as existing technologies assume a rigid subgrade and fail to account for the load-bearing capacity of the soil, leading to instability and potential accidents.
Innovation Solution
A method that creates a subgrade model to predict the resilience of the soil under load, calculates the load on the subgrade for the construction equipment's system status, and compares it with measured data to trigger safety measures when a tipping criterion is reached, using a vehicle model to simulate the interaction between the equipment and subgrade, and implementing safety measures such as warning signals and active adjustments to reduce the risk of tipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing stability standards assume a rigid subgrade, then the stability limits for construction equipment can be determined straightforwardly, but the equipment cannot detect ground failure in situ and is at risk of tipping over on yielding subsoil
Solution Approach 1:
The system continuously measures the actual inclination of the construction equipment and compares it with the predicted inclination calculated from the subgrade model. This feedback loop allows the system to detect deviations indicating ground failure, triggering warning signals or safety measures when the actual inclination exceeds the predicted value by a threshold amount.
Solution Approach 2:
The patent replaces traditional mechanical stability assessment methods with a sensor-based measurement system. Instead of relying on mechanical indicators or simple tilt switches, the system uses inclination sensors to continuously monitor the equipment's orientation and compares it against model predictions, enabling more accurate and reliable stability detection.
2Measurement precision
If the subgrade is modeled as rigid, then calculations are simplified, but the system cannot account for soil compliance and load-bearing capacity variations
Solution Approach 1:
The system changes the fundamental parameter of subgrade stiffness from infinite (rigid) to a finite, variable value representing soil compliance. The subgrade model incorporates elasticity modulus and damping parameters that characterize the soil's load-bearing capacity, allowing the system to accurately model and detect ground failure conditions.
Solution Approach 2:
The patent creates a simplified mathematical model (subgrade model) that copies the essential mechanical behavior of the actual soil. This model uses equivalent elastic and damping parameters to represent the soil's compliance and load-bearing capacity, enabling computational analysis without requiring complex detailed soil mechanics.
3Loss of time
If tilt measurement is performed based on rigid subgrade assumptions, then the system is simpler to implement, but it cannot detect critical load situations early enough to prevent tipping
Solution Approach 1:
The system performs preliminary action by continuously comparing the actual inclination measurement with the predicted inclination from the subgrade model before tipping occurs. When the difference exceeds a threshold, the system triggers warning signals or safety measures in advance, giving operators time to respond and prevent the tipping event.
Solution Approach 2:
The real-time feedback mechanism continuously monitors the discrepancy between actual and predicted inclination, enabling early detection of ground failure conditions. This feedback loop allows the system to respond proactively to changing subgrade conditions, reducing the time to detect and respond to critical load situations.
Data Source
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AI summary
The invention relates to a construction device stabilization method for a construction device (1) standing or driving on a soft subgrade. The construction device (1) has working devices (13) and components which can be moved relative to one another and form a detectable changing system state, and a measurement of the inclination of the construction device (1) is taken continuously or is sampled with a high sampling rate. The method is characterized by the steps of generating a subgrade model with which the softness of the subgrade under load can be calculated in advance; calculating the load on the subgrade for each system state of the construction device (1); calculating a predictive inclination of the construction device (1) in advance while taking into consideration the system state and the subgrade model; comparing the predictive inclination of the construction device (1) with the currently measured inclination of the construction device (1) and iteratively adapting the subgrade model in order to minimize the difference between the predictive inclination and the measured inclination; comparing the predictive inclination for each system state with a specified tilting criterion while taking into consideration the subgrade model, and initiating safety measures if the tilting criterion is reached. The invention further relates to a construction device stabilization system comprising a construction device (1) standing or driving on a soft subgrade, said construction device having working devices (13) and components which can be moved relative to one another and which form a detectable changing system state, and comprising at least one inclination sensor (21). The system is characterized in that an analysis unit (3) and a control unit (4) are provided, wherein the analysis unit (3) contains a subgrade model with which the softness of the subgrade under load can be calculated in advance, and the analysis unit analyzes inclination data measured by the inclination sensor (21) while taking into consideration the respective system state and compares same with specified thresholds. If the thresholds are exceeded, the control unit (4) is actuated by the analysis unit (3) so as to change the system state in order to relieve the load on the construction device (1) in the tilting direction.