Synthetic Fiber Boom Pendants for Rigging Motion Damping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Heavy lifting and digging equipment experiences violent and unpredictable motion in its fixed rigging due to dynamic forces and sudden load changes, leading to potential damage and reduced efficiency, particularly in machines like dragline cranes and power shovels, where traditional wire ropes are heavy and prone to shock loads.
Innovation Solution
The implementation of high-strength synthetic filaments with added damping and armoring solutions, including clamp blocks, pillow materials, and armoring layers, to enhance the abrasion and cut resistance of synthetic cables, and the use of active dampers and sensors for motion control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If traditional wire ropes are used for fixed rigging, then the rigging has high strength and durability, but the weight is excessive and shock loads cause violent motion and potential damage
Solution Approach 1:
The patent changes the material parameters of the rigging by using synthetic fiber ropes with higher strength-to-weight ratios than traditional wire ropes. This allows reduction of rigging weight while maintaining or improving shock load resistance through the inherent damping properties of synthetic materials.
Solution Approach 2:
The patent employs composite construction by combining synthetic fibers with damping elements and armoring layers. This creates a multi-layered rigging system that integrates weight reduction, shock absorption, and durability functions into a single composite structure.
2Weight of moving object
If synthetic fiber ropes are used to reduce weight, then weight savings and improved payload capacity are achieved, but the ropes are more susceptible to abrasion and cutting
Solution Approach 1:
The patent applies composite construction by integrating armoring layers into the synthetic rope structure. These armoring layers provide enhanced abrasion and cut resistance while the synthetic core maintains the weight reduction benefits, creating a multi-functional composite rigging system.
Solution Approach 2:
The patent applies armoring specifically at critical locations where abrasion and cutting risks are highest, such as at contact points with sheaves and edges. This localized reinforcement provides protection where needed most while maintaining overall light weight.
3Device complexity
If no damping elements are added to the rigging, then the structure remains simple, but violent oscillating motions occur due to dynamic forces and sudden load changes
Solution Approach 1:
The patent merges the damping function with the existing rope structure by integrating damping elements directly into the rigging system. This combination approach provides motion control without requiring separate, complex damping systems, thus balancing simplicity with stability.
Solution Approach 2:
The patent introduces damping elements as intermediary components between the synthetic fibers and the external environment. These intermediaries absorb and dissipate vibrational energy from dynamic forces and sudden load changes, reducing violent oscillations while maintaining structural simplicity.
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
This solution effectively reduces unwanted motion and enhances the durability of tensile strength members, allowing for weight savings and improved payload capacity by stabilizing the rigging systems and reducing cyclic shock loads, thereby extending the lifespan of equipment and improving operational efficiency.
Implementation Method 1
The implementation of high-strength synthetic filaments with added damping and armoring solutions, including clamp blocks, pillow materials, and armoring layers, to enhance the abrasion and cut resistance of synthetic cables, and the use of active dampers and sensors for motion control.
Implementation Method 2
The implementation of high-strength synthetic filaments with added damping and armoring solutions, including clamp blocks, pillow materials, and armoring layers, to enhance the abrasion and cut resistance of synthetic cables
Data Source
AI summary
A method and hardware for damping and controlling unwanted motion in the fixed rigging of large machines. In a first approach large clamp blocks are added to multi-cable rigging systems. These blocks use a first cable to damp the motion of an adjacent cable. The invention also encompasses adding armored sections to synthetic cables to enhance their abrasion resistance and cut resistance.