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chrisdembia / yeadon

The human inertia model developed by Fred Yeadon in 1990.
https://pypi.python.org/pypi/yeadon
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Location of hip joint centres. #7

Closed chrisdembia closed 13 years ago

chrisdembia commented 13 years ago

Yeadon has suggested that the lateral distance between the hip joint centres and the center of the Ls0 level should be

.5r + .5t

where r and t are the radius and thickness of the Ls0 stadium. Currently, this lateral distance is t.

Jason do you support changing t to .5r + .5t?

moorepants commented 13 years ago

so r has to be greater than t for .5t+.5r>t one of the Ls0 measurements gives this

w=32.4 and p=86.9

so

r = 9.68 and t = 6.52

meaning that .5r + .5t > t

When I measure my hip joint center to center i get about 22.9 cm. 2*(.5r + .5t) is much closer to this than t. I'm not sure what the reasoning is for using .5r + .5t, but I think it is better than t.

If that is generally the case for folks hip measurements, then yes, we should change it to this new value.

chrisdembia commented 13 years ago

i haven't used vim in a few days and i'm already losing the feel =/

On 08/02/2011 01:03 PM, moorepants wrote:

so r has to be greater than t for .5t+.5r>t one of the Ls0 measurements gives this

w=32.4 and p=86.9

so

r = 9.68 and t = 6.52

meaning that .5r + .5t> t

When I measure my hip joint center to center i get about 22.9 cm. .5r + .5t is much closer to this than t. I'm not sure what the reasoning is for using .5r + .5t, but I think it is better than t.

If that is generally the case for folks hip measurements, then yes, we should change it to this new value.

moorepants commented 13 years ago

you gotta stick with it!

On Tue, Aug 2, 2011 at 10:47 AM, fitze < reply@reply.github.com>wrote:

i haven't used vim in a few days and i'm already losing the feel =/

On 08/02/2011 01:03 PM, moorepants wrote:

so r has to be greater than t for .5t+.5r>t one of the Ls0 measurements gives this

w=32.4 and p=86.9

so

r = 9.68 and t = 6.52

meaning that .5r + .5t> t

When I measure my hip joint center to center i get about 22.9 cm. .5r + .5t is much closer to this than t. I'm not sure what the reasoning is for using .5r + .5t, but I think it is better than t.

If that is generally the case for folks hip measurements, then yes, we should change it to this new value.

Reply to this email directly or view it on GitHub: https://github.com/fitze/yeadon/issues/7#issuecomment-1711206

http://mae.ucdavis.edu/~biosport/jkm/ Sports Biomechanics Lab http://biosport.ucdavis.edu, UC Davis Davis Bike Collective http://www.davisbikecollective.org Minister, Davis, CA BikeDavis.info Office: +01 530-752-2163 Lab: +01 530-752-2235 Home: +01 530-753-0794

chrisdembia commented 13 years ago

This is a reminder that Luke's nipple (Ls3) level needs to be remeasured.

On 08/02/2011 01:03 PM, moorepants wrote:

so r has to be greater than t for .5t+.5r>t one of the Ls0 measurements gives this

w=32.4 and p=86.9

so

r = 9.68 and t = 6.52

meaning that .5r + .5t> t

When I measure my hip joint center to center i get about 22.9 cm. .5r + .5t is much closer to this than t. I'm not sure what the reasoning is for using .5r + .5t, but I think it is better than t.

If that is generally the case for folks hip measurements, then yes, we should change it to this new value.

moorepants commented 13 years ago

luke's nipple perimeter = 96.5 cm width = 31.0 cm

i didn't measure the height. do you need that?

On Tue, Aug 2, 2011 at 10:49 AM, fitze < reply@reply.github.com>wrote:

This is a reminder that Luke's nipple (Ls3) level needs to be remeasured.

On 08/02/2011 01:03 PM, moorepants wrote:

so r has to be greater than t for .5t+.5r>t one of the Ls0 measurements gives this

w=32.4 and p=86.9

so

r = 9.68 and t = 6.52

meaning that .5r + .5t> t

When I measure my hip joint center to center i get about 22.9 cm. .5r + .5t is much closer to this than t. I'm not sure what the reasoning is for using .5r + .5t, but I think it is better than t.

If that is generally the case for folks hip measurements, then yes, we should change it to this new value.

Reply to this email directly or view it on GitHub: https://github.com/fitze/yeadon/issues/7#issuecomment-1711218

http://mae.ucdavis.edu/~biosport/jkm/ Sports Biomechanics Lab http://biosport.ucdavis.edu, UC Davis Davis Bike Collective http://www.davisbikecollective.org Minister, Davis, CA BikeDavis.info Office: +01 530-752-2163 Lab: +01 530-752-2235 Home: +01 530-753-0794

chrisdembia commented 13 years ago

Oh oops I didn't know the emails were coming here. Issue closed.