Dynamic Balancing Mobile Body Inertia Axis Alignment
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Solution Overview
Problem
Mechanical precision devices face challenges in maintaining precision due to defects in the guidance of mobile components during pivoting or oscillation, leading to mediocre precision and wear, which static balancing partially addresses but not fully, as inertia defects induce significant operational disturbances.
Innovation Solution
A method for dynamic balancing of mobile components, involving the adjustment of the main axis of inertia to align with the axis of rotation, using techniques such as machining and material addition/removal on flanges and shafts to achieve precise balancing and reduce unbalance moments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If static balancing is performed to bring the center of mass back to the axis of pivoting, then wear is delayed and basic precision is improved, but inertia defects still induce significant disturbances on mechanism operation
Solution Approach 1:
The patent transitions from static balancing (center of mass alignment) to dynamic balancing by modifying the inertia parameters. Specifically, it adjusts the distribution of mass around the rotation axis to align the principal axis of inertia with the rotation axis, thereby changing the inertial characteristics of the moving component to eliminate vibration and operational disturbances during rotation.
2Manufacturing precision
If geometric quality of machining is improved to ensure precision operation, then initial precision is enhanced, but friction and wear in guides still degrade performance over time
Solution Approach 1:
The patent applies dynamic balancing as a preliminary action before the mechanism enters service. By pre-aligning the principal axis of inertia with the rotation axis through controlled material removal or addition, the mechanism is prepared to operate without inducing harmful vibrations and bearing pressures, thereby preventing premature wear and extending service life.
3Productivity
If higher rotation speeds and oscillation frequencies are achieved to improve productivity, then output increases, but friction in guides increases and precision deteriorates
Solution Approach 1:
The patent applies preliminary anti-action by performing dynamic balancing to counteract the harmful effects of rotation before they occur. By eliminating inertia defects and aligning the principal axis of inertia with the rotation axis, the mechanism is prepared to withstand higher rotation speeds and oscillation frequencies without developing excessive friction or losing precision, thus enabling increased productivity.
Data Source
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AI summary
The invention relates to a method for improving the pivotal movement of a mobile body (1) for a scientific instrument, comprising a shaft (10) pivoting or oscillating about an axis (D), wherein said method comprises: statically balancing said mobile so as to bring the center of gravity thereof onto said axis (D); determining a target value of the resulting imbalance momentum of the mobile body about said axis (D), which corresponds to a predetermined divergence between a first longitudinal main axis of inertia of said mobile body and said axis (D); rotating said mobile body about said axis (D) at a predetermined speed, and measuring the resulting imbalance momentum relative to said axis (D); and adjusting the value of the resulting imbalance momentum of said mobile body about said axis (D) to within a given predetermined tolerance relative to said target value, wherein said adjustment is carried out by machining on either side of a median plane (P) comprising the two secondary axes of inertia of said mobile body.