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Related Concept Videos

Sound Waves: Resonance01:14

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Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
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The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
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SU-D-218-03: Resonant Frequency of Rotating Anode X-Ray Tubes.

M Shin1, P Lillaney1, W Hinshaw1

  • 1Stanford University, Stanford, CA.

Medical Physics
|May 19, 2017
PubMed
Summary
This summary is machine-generated.

This study evaluated X-ray tube rotor dynamics using finite element modeling (FEM) and experiments. The validated FEM model helps ensure stable operation by identifying and predicting resonant frequencies for design improvements.

Keywords:
AmplifiersAnodesFinite element methodsFrequency analyzersModelingPosition sensitive detectorsSpectrum analyzersVibration analysisVibration resonance

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Area of Science:

  • Medical Imaging Physics
  • Mechanical Engineering

Background:

  • Rotating anode X-ray tubes are critical components in medical imaging systems.
  • Ensuring stable and safe operation requires understanding rotor dynamics and vibration characteristics.

Purpose of the Study:

  • To assess a new rotating anode X-ray tube's resonant frequencies for operational stability.
  • To validate a finite element model (FEM) for analyzing X-ray tube rotor dynamics and vibrations.

Main Methods:

  • Developed a 3D FEM model of the X-ray tube motor using ANSYS and COMSOL.
  • Validated FEM simulations with experimental measurements of resonant frequencies using accelerometers and spectrum analyzers.
  • Observed resonant frequencies through angular speed curves obtained from quadrature position sensors.

Main Results:

  • FEM simulation predicted the first mode resonance at 20.3 Hz, closely matching experimental peaks at 22.2 Hz.
  • Resonance without the anode was simulated at 35.1 Hz, matching experimental findings.
  • Abrupt changes in angular acceleration correlated with predicted resonant frequencies.

Conclusions:

  • Resonant frequencies must be considered for safe operation, especially during repeated acceleration/deceleration in image-guided procedures.
  • The validated FEM model provides crucial insights for designing X-ray tube motors with improved resonance characteristics.
  • Ongoing design modifications aim to shift the motor assembly's resonance to higher frequencies.