Weight Stability Control for Deadweight Force Standard Machines
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Solution Overview
Problem
Existing deadweight force standard machines experience weight instability due to non-horizontal machined surfaces, non-central centers of mass, unequal weight intervals, and an unstable weight platform, leading to shaking of weights when moved at the same speed.
Innovation Solution
A weight stability control method that involves a no-load stroke, a loaded stroke with slow displacement, and rapid displacement phases to manage the loading process of weights, utilizing lifting components and sensors to detect and control weight platform displacements and maintain stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If weights are moved at the same speed during loading, then loading efficiency is improved, but weight stability deteriorates causing shaking
Solution Approach 1:
The patent applies periodic action by implementing alternating rapid and slow displacement phases during weight loading. The weight platform performs rapid displacement to lift weights quickly, then switches to slow displacement when weights interact with the weight disk to maintain stability. This periodic switching between speed modes resolves the contradiction by allowing high productivity during rapid phases while ensuring weight stability during slow phases.
2Productivity
If loading speed is increased to improve productivity, then loading time is reduced, but weight stability deteriorates due to non-horizontal surfaces and non-central centers of mass
Solution Approach 1:
The patent applies dynamics by making the displacement speed of the weight platform variable rather than constant. The control system dynamically adjusts the speed based on the loading phase: rapid displacement when weights need to be lifted efficiently, and slow displacement when weights interact with the weight disk to account for manufacturing imperfections like non-horizontal surfaces and non-central centers of mass. This dynamic speed adjustment resolves the contradiction between loading speed and weight stability.
3Loss of time
If rapid displacement is used to improve loading efficiency, then loading time is reduced, but weight stability deteriorates causing weights to become shaky
Solution Approach 1:
The patent implements periodic action by alternating between rapid displacement phases (to reduce loading time) and slow displacement phases (to maintain weight stability). The rapid displacement occurs when weights are being lifted from the platform, and the slow displacement occurs when weights interact with the weight disk. This periodic switching minimizes the total time lost to stability concerns while ensuring weights remain stable during critical interaction moments.
Data Source
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AI summary
The present invention provides a weight stability control method for a deadweight force standard machine, which method comprises the steps: S1, rapidly moving a weight platform downwards from an initial position, lifting a first-stage weight by a weight disk, and starting to load the first-stage weight starts; S2, starting to slowly displace the first-stage weight when the first-stage weight communicates with a second-stage weight via corresponding lifting components for the first time; S3, after the first-stage weight is completely separated from the second-stage weight, rapidly displacing the weight platform downwards again until a gap between the first-stage weight and the second-stage weight reaches half of a pre-set gap value; and S4, repeating steps S1-S3 in the loading process of the first-stage weight for the second-stage weight to the nth-stage weight in sequence until all the weights are loaded. The present invention can achieve control over the stability of the weights, effectively solve the weight shaking problem and improve the testing efficiency.