Dump Truck Stress Estimation Using Force and Acceleration Sensors
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Solution Overview
Problem
Existing stress calculation systems for dump trucks lack the accuracy in estimating stress, particularly in directly estimating stress from sensor output values, limiting their effectiveness in managing fatigue and ensuring safety.
Innovation Solution
A stress estimation device that includes a storage section for force and stress calculation formulas, utilizing force and acceleration sensors to calculate forces and stresses on a dump truck, and a calculation section to derive accurate stress estimates using these formulas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If stress is directly estimated from sensor output values, then the calculation process is simplified, but the estimation accuracy is insufficient
Solution Approach 1:
The patent introduces an intermediary calculation process that converts sensor output values to forces first, then to stresses. This two-stage conversion process acts as a mediator between the raw sensor data and the final stress estimation, improving accuracy while maintaining reasonable computational complexity.
Solution Approach 2:
The patent replaces direct stress estimation with a physics-based mechanical calculation approach. By using force calculations based on sensor data and then applying stress formulas, the system substitutes a more accurate physics-based model for the simpler direct estimation method.
2Measurement precision
If more sensors are used to improve stress estimation accuracy, then measurement precision improves, but device complexity and cost increase
Solution Approach 1:
The patent replaces the need for multiple stress sensors with a combination of force sensors and acceleration sensors coupled with physics-based calculations. This substitution uses mechanical principles and mathematical models to derive stress information from more accessible sensor data, reducing sensor system complexity while maintaining or improving accuracy.
Solution Approach 2:
The patent uses force and acceleration as intermediary physical quantities that can be measured with simpler sensors. These intermediaries serve as bridge measurements that, when processed through physics-based formulas, yield accurate stress estimates without requiring direct stress sensing.
Data Source
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AI summary
The disclosure provides a stress estimation device that allows estimating a stress acting on a dump truck with higher accuracy. The stress estimation device 100 includes a storage section 110 and a calculation section 120, and estimates the stress acting on a dump truck 200. The storage section 110 stores a force calculation formula 111 and a stress calculation formula 112. The calculation section 120 includes a force calculation section 121 and a stress calculation section 122. The force calculation section 121 calculates a force acting on a predetermined part of the dump truck 200 using an output value of a force sensor 230 or an output value of an acceleration sensor 240, an output value of the force sensor 230, and the force calculation formula 111 stored in the storage section 110. The stress calculation section 122 calculates the stress acting on the dump truck 200 using the force calculated by the force calculation section 121 and the stress calculation formula 112 stored in the storage section 110.