Excavator Slewing Power Control via Dynamic Stress Model
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Solution Overview
Problem
Existing machines, such as excavators, face structural damage and safety risks when increasing slewing power to handle heavy loads, particularly in operations like dredging, as existing control systems do not provide continuous operation without stopping the swiveling movement.
Innovation Solution
A control system that includes sensors for boom and stick positions, operator input, and strain sensors to create a dynamic stress model, determining an applied slewing power threshold and adjusting power accordingly to prevent structural damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If slewing power is increased to handle heavy loads, then the machine can operate under heavy resistance, but structural damage may occur
Solution Approach 1:
The control system dynamically adjusts the slewing power threshold based on real-time machine configuration (boom length, stick length, bucket load) and operating conditions. This allows the system to optimize slewing power for each specific scenario, providing sufficient power for heavy loads while preventing excessive power that could cause structural damage.
Solution Approach 2:
The system continuously monitors machine parameters and uses this feedback to adjust the sleving power threshold. By incorporating real-time data about boom position, stick position, and load conditions, the control system can adaptively determine the appropriate power level to apply, ensuring both adequate performance and structural safety.
2Productivity
If existing control systems are used, then the machine can operate, but continuous operation without stopping swiveling movement cannot be achieved under heavy loads
Solution Approach 1:
The control system calculates and establishes the slewing power threshold before actual slewing operation begins. By pre-determining the safe power level based on machine configuration and load conditions, the system ensures that continuous operation can proceed safely without needing to stop and recalculate, thereby maintaining both productivity and reliability.
3Adaptability or versatility
If machine components are designed for maximum structural limits, then the machine can handle heavy loads, but the risk of structural damage increases
Solution Approach 1:
The system changes the operational parameters (slewing power threshold) based on the specific machine configuration and load conditions. Rather than operating at fixed maximum structural limits, the control system adjusts power parameters dynamically to match actual operating requirements, enabling heavy load handling while maintaining a safety margin against structural damage.
Data Source
AI summary
A control system for a machine includes a boom position sensor to generate signals indicative of a boom position, a stick position sensor to generate signals indicative of a stick position, and an operator input sensor to enable an operator to input a slewing power demand and generate signals indicative of the slewing power demand. The control system includes a controller communicably coupled to the boom position sensor, the stick position sensor, and the operator input sensor. The controller creates a dynamic stress model of the machine based on at least one of the boom position and the stick position. The controller receives the signals indicative of the slewing power demand. The controller determines an applied slewing power threshold based on the dynamic stress model. The controller compares the slewing power demand with the applied slewing power threshold and adjusts the applied slewing power based on the comparison.