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PowerPoint Slides:

Webinar_33_Rainflow_Fatigue.pptx

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References:

Steinberg’s Vibration Analysis for Electronic Equipment

Rainflow Fatigue Posts

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Matlab script: Vibrationdata Signal Analysis Package

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See also: Vibrationdata Webinars

Thank you,

Tom Irvine

PowerPoint Slides:

Webinar_32_circuit_board_fatigue.ppt

Audio/Visual File:

Circuit Board Fatigue.wmv

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References:

Steinberg’s Vibration Analysis for Electronic Equipment

Extending Steinberg’s Fatigue Method

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Matlab script: Vibrationdata Signal Analysis Package

* * *

See also: Vibrationdata Webinars

Thank you,

Tom Irvine

PowerPoint Slides:

Webinar_31_rectangular_circular_plates.pptx

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References:

Leissa, Vibration of Plates

Rayleigh Method

circular.pdf

fixed_free_fixed_free_plate.pdf

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Matlab script: Vibrationdata Signal Analysis Package

Data files included in the Package zip file:

srs1000G_accel.txt & navmat_spec.psd

* * *

See also: Vibrationdata Webinars

Thank you,

Tom Irvine

PowerPoint Slides:

Webinar_30_rectangular_plates.pptx

Audio Visual File:

Rectangular Plate Shock & Vibration.wmv

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References:

Leissa, Vibration of Plates

Plate Base Excitation: plate_base_excitation.pdf

The Natural Frequency of a Rectangular Plate Point-Supported at Each Corner: plate_point_corner.pdf

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Matlab script: Vibrationdata Signal Analysis Package

Data files included in the Package zip file:

srs1000G_accel.txt & navmat_spec.psd

* * *

See also: Vibrationdata Webinars

Thank you,

Tom Irvine

PowerPoint Slides:

Webinar_29_stress_velocity.pptx

Audio Visual Files:

Stress Velocity Part1.wmv

Stress Velocity Part2.wmv

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Acceleration Time History: Time (sec) & Accel (G) srs1000G_accel.txt

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References:

Stress-Velocity Relationship: sv_velocity.pdf

Bending Frequencies of Beams, Rods, and Pipes: beam.pdf

Modal Transient Vibration Response of a Cantilever Beam Subjected to Base Excitation: cantilever_modal_transient_base.pdf

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Matlab script: Vibrationdata Signal Analysis Package

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See also:

Vibrationdata Webinars

Dr. Howard Gaberson’s Papers

Thank you,

Tom Irvine

PowerPoint Slides:  Webinar_28_mdof_SRS.pptx

Audio/Visual Files:

MDOF_SRS_1.wmv

MDOF_SRS_2.wmv

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Acceleration Time History:  Time (sec) & Accel (G)    srs2000G_accel.txt

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References:

Two-Stage Isolation for Harmonic Base Excitation: two_stage_isolation.pdf

Shock Response of Multi-degree-of-freedom Systems: mdof_srs.pdf

* * *

Matlab script: Vibrationdata Signal Analysis Package

* * *

See also:

Vibrationdata Webinars

Thank you,

Tom Irvine

Wire rope damping depends on:

1. Material
2. Diameter
3. Length
4. Number of strands
5. Number of turns per length
6. Initial tension or preload
7. Displacement amplitude

The damping can be very nonlinear, particularly depending on displacement amplitude.

The flexing of wire rope involves both coulombic and viscous damping. At very low vibration levels, the wire strands stick together and little sliding occurs. The damping is low and the behavior is viscous.

With higher displacements, coulomb damping predominates as the wires break free and start to slide against each other, absorbing large amounts of energy.

At large displacements the bending and stretching of the wire strands overshadows the sliding friction and viscous behavior again starts to show.

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Here are some viscous damping values for straight cables.

Longitudinal Vibration for 10 mm (0.39 inch) diameter:
Damping = 0.7% to 2.0% (ref 1)

Transverse Vibration for 3/8 inch diameter:
Damping = 0.3% to 0.5% (ref 2)

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For the case of wire rope used in helical isolators, the damping can vary from 5% to 22% (ref 3).

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Wire Rope Isolation of a Camera Video

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References

1. Feyrer, Wire Ropes: Tension, Endurance, Reliability

2. Vanderveldt, Chung and Reader, “Some Dynamic Properties of Axially Loaded Wire,” Experimental Mechanics, 1973.

3. http://www.enidine.com/Industrial/WireFAQmain/#14

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See also:
http://sem-proceedings.com/24i/sem.org-IMAC-XXIV-Conf-s02p04-Modal-Damping-Estimates-from-Static-Load-deflection-Curves.pdf

Initial investigations into the damping characteristics of wire rope vibration isolators

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- Tom Irvine

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