dashdotrobot/phd-thesis

PhD dissertation on bicycle wheels

phd-thesis's Issues

Write an abstract

Lateral stiffness of asymmetric wheels

Obtain permission from Rinard to reprint stiffness results

See section on lateral stiffness with tension.

Buckling under external loads

• Riks simulations for lateral load with tension
• "Optimum" spoke tension for lateral loads
• ABAQUS simulations of radial buckling
• Hinged-column model
• Analytical model for P_c

Lateral (point) stiffness vs. tension experiments

Repeat Damon Rinard's experiments with a stiff hub and multiple loads.

Lateral stiffness with offset spokes

Add caption to tension buckling simulation figure

Consider including lateral loads in "role of spoke tension" section

Define d = [u,v,w,phi] and use d_m for mode coefficient vector

This simplifies the definition of the 4x4 spoke stiffness matrix and the definition of the B(theta) matrix for the mode matrix method.

Table of design parameters in Optimization chapter

Fix chapter label for appendix

Appendix sections should be listed A, B, C, ... and tables and figures should be labeled A.1, A.2, ... B.1, ...

Power law for buckling tension with low GJ is incorrect

The switch from T to T_bar seems to be the culprit.

Expand derivation of rim mechanics

Thesis committee requested a more detailed derivation of the kinematics and strain energy of a curved, monosymmetric beam. Some key citations on thin-walled beam sections should be added.

Mic calibration code doesn't work

Need to actually calculate PSDs from sound files.

Remove references to "Online Resource" in EMA chapter

Extended experimental techniques should be described in the main text or in an appendix.

Acoustic testing: undergraduate activity

Write a description of the acoustic EMA bicycle rim testing activity for ME 363.

Add reference for Salamon and Oldham

Add tension labels in radial buckling simulation load-displacement diagrams

Acknowledgements section

Remove todonotes and editing margin.

Upgrade code to python3

Give special cases of k_bar in an Appendix

w-displacement under radial load plots may be incorrect

Optimum wheels and scaling laws

Concluding remarks

Add (in progress) placeholders in incomplete sections.

Final proof-read

Re-do acoustic stiffness bar chart in color

Use two shades of blue for EI and GJ and red for mu to more easily distinguish scales.

Substitute \gls{} symbols in figure annotations

Three conflicting definitions of symbol $t$

$t$ is used as non-dimensionalized tension, time, and rim wall thickness.

Put Klat vs. tension plots onto a single row

The space in the bottom-right was left for my experiments, but that section will require more writing anyways so the results will probably be plotted elsewhere anyway.

Spoke influence functions for multiple spoke patterns

Show effect of unit radial/tangential load for:

• Radial
• 3-cross
• 3-cross/Radial?

Create bibtex database and update citations

Clarify shear center, centroid, and coordinate triad in wheel schematic

Finish introduction

• Historical notes (Ferris wheel, Eiffel tower,...)
• Technical literature review

Add x-axis label to radial buckling post-mortem plots

Change eqn. reference in EMA section from conf. paper to earlier section

Come up with a title

Harmonize conflicting stiffness terms

There is a large number of symbols for stiffness:

K_{rim, n}, K_{lat}, K_n^{lat}, K_{eff, n}

Need to make these clear and consistent across chapters. Is there a simple way to indicate point stiffness vs. mode stiffness?

Standardize colors and format for plots

Use standard color series from matplotlib 2.0

Radial buckling experiments

Add photo of wheel taco in Chapter 5

Use photos taken on NU campus.

Fix axis labels on acoustic mode stiffness figurue

Placement is off and M\omega^2 should be changed to m_rim (2\pi f_n^lat)^2

Make k^tens and k^el consistent throughout

• Replace {tens} and {el} with macros so that they could be redefined as {matl} and {geom} if desired.
• Be consistent about using k_uu^{el} in buckling equations when k_uu must be separated.

Write up buckling tension (K2 vs. T) experiments

Limitations of assumptions

Cite John Forester's Wheelmen article

Mention his article, "Held up by Downward Pull" in the brief section discussing the role of spoke tension in supporting loads. Relevant to the "stands on hub" or "hangs from rim" argument.

Add missing references

Summarize contributions from Jim in Bicycling Science

Create list of symbols