Payload Weight Calculation Compensation in Load Lifting Rigs
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Solution Overview
Problem
Existing load lifting machines face inaccuracies in weight calculation due to unaccounted friction and other losses, which affect the precision of determining payload weights.
Innovation Solution
A load lifting machine equipped with sensors to measure hydraulic fluid pressure and speed, coupled with a processor that calculates payload weight by compensating for friction and other losses using a compensation lift, employing equations that adjust for lift and return pressures and speed variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If weight calculation is performed using hydraulic pressure sensors without friction compensation, then the calculation process is simple, but the measurement precision deteriorates due to unaccounted friction and losses
Solution Approach 1:
The system performs a preliminary compensation lift before actual weight measurement to determine friction and loss coefficients. This preliminary action characterizes the rig's frictional properties, which are then used to compensate for losses during the actual payload weight calculation, improving measurement precision without requiring complex real-time adjustments
Solution Approach 2:
The system uses feedback from the compensation lift measurements to continuously refine the friction compensation model. By comparing the actual hydraulic pressures during compensation lifts with theoretical values, the system calculates loss coefficients that are fed back into the weight calculation algorithm, creating a closed-loop system that improves accuracy
2Measurement precision
If friction compensation through compensation lifts is implemented, then measurement precision improves, but the time required for weight determination increases
Solution Approach 1:
The compensation lift is performed as a preliminary step before actual weight measurement, allowing friction characteristics to be determined in advance. This separates the time-consuming characterization phase from the actual measurement phase, enabling faster subsequent weight determinations using the pre-determined compensation parameters
Solution Approach 2:
The system performs a simplified compensation procedure that captures the essential friction characteristics without requiring exhaustive measurement. By using a single compensation lift or limited number of lifts to establish friction coefficients, the system achieves sufficient accuracy without excessive time investment
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
The solution provides improved accuracy in payload weight determination by accounting for friction and other losses, enhancing the precision of weight calculations in load lifting machines.
Implementation Method 1
The apparatus typically look at the pressure of hydraulic fluid in hydraulic actuators as the payload is being lifted
Implementation Method 2
the base their calculations on assumptions regarding the characteristics of the load lifting machine rig. Often characteristics such as friction are not taken into account
Data Source
AI summary
A method and apparatus for determining weight of a payload lifted by a rig of a load lifting machine. The weight is determined from at least one parameter being or indicative of the force or pressure existing in or applied by the rig while the payload is lifted and a compensation for friction and/or other losses in the rig 14.