Lifting Device Trajectory Control for Collision-Free Load Movement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current lifting device control systems require manual operation and extensive training to manage complex motion processes efficiently, leading to potential collisions and increased physical and mental stress, as they struggle to optimize rapid and precise movement of loads while minimizing swinging motions.
Innovation Solution
A method that calculates a dynamic path based on predetermined kinematic and geometric limits, combining geometric and dynamic paths to create an automated, collision-free trajectory for lifting devices with multiple motion axes, allowing for efficient and reproducible load movement without manual intervention, and enabling optimization of loading and unloading processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rapid motion processes are used to raise economy of logistical processes, then throughput time is reduced, but swinging motions of the load receiver element increase which delay the manipulation process
Solution Approach 1:
The control unit calculates a trajectory in advance that includes intermediate points and smooth transition paths between them. The trajectory is pre-computed to ensure that when the load receiver element moves rapidly, it follows a predetermined smooth path that prevents swinging, thus resolving the contradiction between speed and stability.
Solution Approach 2:
The system dynamically adjusts the trajectory based on real-time position data of the load receiver element. The control unit continuously monitors actual position versus planned position and modifies the trajectory accordingly, allowing rapid motion while maintaining stability through adaptive control.
2Manufacturing precision
If high concentration and prolonged sitting are required for precise control, then manipulation precision is improved, but physical stress on the crane operator increases
Solution Approach 1:
The control system performs autonomous trajectory calculation and execution without requiring continuous manual intervention. The control unit automatically monitors position, calculates corrections, and adjusts the trajectory, allowing the system to serve itself rather than requiring constant operator input, thus reducing physical stress while maintaining precision.
Solution Approach 2:
The patent replaces manual mechanical control with an automated control system that uses sensors, computing units, and control algorithms. This substitution eliminates the need for prolonged sitting and high concentration from the operator, as the electronic control system handles the precision manipulation tasks automatically.
3Ease of operation
If manual operation is used to control the lifting device, then operational flexibility is maintained, but error frequency increases due to high mental stress and training requirements
Solution Approach 1:
The control unit continuously receives feedback from position sensors about the actual location of the load receiver element and compares it with the planned trajectory. Based on this feedback, the system automatically calculates and executes corrections, eliminating human error while maintaining flexibility through programmable trajectory adjustments.
Solution Approach 2:
The system allows flexible operation by enabling dynamic changes in trajectory parameters such as speed, intermediate points, and timing. These parameters can be adjusted through programming rather than manual control, reducing error frequency while maintaining operational flexibility through automated parameter modification.
4Productivity
If multiple experienced crane operators are deployed for continuous 24-hour operation, then productivity is maintained, but loss of time for training and education increases
Solution Approach 1:
The automated control system performs continuous operation autonomously without requiring multiple trained operators. The control unit manages trajectory calculation, position monitoring, and error correction automatically, eliminating the need for human operators and their associated training time while maintaining continuous productivity.
Solution Approach 2:
The patent replaces the human operator system with an automated control system that can operate continuously without fatigue or training requirements. This substitution eliminates the time loss associated with training multiple operators while maintaining the ability for continuous 24-hour operation through electronic control rather than human labor.
Data Source
AI summary
Method for controlling a lifting device to move a load along a trajectory, to move the load in an efficient, automated, and collision-free manner between points, includes a start point and end point of the trajectory and prohibited zones are established which, during motion of the load are avoided. A computing unit calculates a geometric or rounded geometric or smooth geometric path, that kinematic and geometric limit values of the lifting device are predetermined, from which the computing unit, on the basis of the geometric or rounded geometric or smooth geometric path, calculates a dynamic or rounded dynamic or smooth dynamic path which provides time information about motion of the load along the geometric or rounded geometric or smooth geometric path. The geometric or rounded geometric or smooth geometric path and the dynamic or rounded dynamic or smooth dynamic path are combined for producing the trajectory.