Tuned Damper for Rotary Encoder Vibration Isolation
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Solution Overview
Problem
Rotary encoders face position loss due to resonant vibrations, particularly in machining operations with long slender tools, leading to mechanical noise and potential damage from excessive vibration, which existing tuned damped absorber arrangements fail to fully mitigate without compromising position accuracy.
Innovation Solution
A damper device with a unique configuration that attenuates both torsional and lateral vibrations using a mounting plate, torsional mass plate, and resilient elements to reduce vibration susceptibility and maintain position accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a tuned damped absorber arrangement is used to attenuate encoder vibration, then vibration response is reduced, but position accuracy may be compromised
Solution Approach 1:
The damper device is segmented into distinct functional components: a mounting plate for attachment, a torsional mass plate for inertial damping, and resilient elements for vibration isolation. This segmentation allows each component to perform its specific function optimally while maintaining overall encoder position accuracy.
Solution Approach 2:
The resilient elements act as intermediaries between the encoder mounting structure and the external environment, absorbing and attenuating vibration disturbances before they reach the encoder, thereby protecting position accuracy while reducing vibration response.
2Reliability
If the encoder is isolated from the axis to prevent vibration, then reliability is improved, but position indicating accuracy is lost
Solution Approach 1:
The harmful vibration frequencies are extracted and isolated from the encoder signal path through the tuned damped absorber mechanism, allowing the encoder to remain mechanically connected to the axis for accurate position indication while being protected from vibration-induced reliability issues.
Solution Approach 2:
The damper device applies localized vibration attenuation specifically at the encoder mounting point through the torsional mass plate and resilient elements, providing targeted protection against vibration while maintaining overall system connectivity and position accuracy.
3Productivity
If long slender tools are used in machining operations, then productivity is improved, but resonant vibration increases
Solution Approach 1:
The resonant vibration energy that would normally harm the encoder is converted into useful damping through the tuned mass absorber mechanism, where the torsional mass plate and resilient elements transform harmful vibrational energy into harmless thermal energy through controlled resonance and damping.
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 damper device effectively reduces unwanted vibrations, preventing position drift and mechanical noise, while ensuring the encoder's reliability and longevity by isolating the encoder from resonant vibrations without affecting velocity loop bandwidth.
Implementation Method 1
A washer 25 is used on the end of each of the shoulder bolts 20, and the washer presses against a first outer resilient element such as a resilient donut 26 that presses against the outer side 27 of the mounting flange 23
Implementation Method 2
A torsional mass plate 18 is coupled to the mounting plate 14 by a plurality of fastening elements such as shoulder bolts 20
Implementation Method 3
The absorber 40 comprises a ring shaped mass element 44 which is attached to the end of the input shaft 42
Implementation Method 4
Through the use of the damper devices described above, the susceptibility of the A-axis scale of a rotary encoder to induced torsional and lateral vibrations is significantly reduced
Data Source
AI summary
A tuned damper for the input shaft on a rotary encoder includes a mounting plate and a mass plate having a plurality of mounting flanges each having mounting apertures. Fastening elements couple the mass plate to the mounting plate, and resilient elements or donuts each having a central aperture are positioned on either side of each mounting flange. The diameter of the fastening elements is smaller than the diameter of the mounting apertures and the holes in the resilient donuts so that the fastening elements do not touch the body of either the resilient elements or the mounting flange and the mass plate does not directly contact the mounting plate in order to isolate the mass plate from the mounting plate. The mass plate dampens torsional vibration which may exist in the input shaft of the encoder.