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visual3d:documentation:definitions:adjusted_zatsiorsky-seluyanov_s_segment_inertia_parameters [2024/07/17 15:45] – created sgrangervisual3d:documentation:definitions:adjusted_zatsiorsky-seluyanov_s_segment_inertia_parameters [2024/11/15 15:25] (current) – wikisysop
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 ==== Segment Mass ==== ==== Segment Mass ====
 +
 +  * Relative to total body mass.
  
 |Segment  |Female|Male  | |Segment  |Female|Male  |
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 |Foot     |0.0129|0.0137| |Foot     |0.0129|0.0137|
  
-  * Relative to total body mass. 
  
 ==== Segment Centre of Mass Location ==== ==== Segment Centre of Mass Location ====
 +
 +
 +  * Relative to the segment's proximal endpoint.
  
 |Segment  |Female|Male  | |Segment  |Female|Male  |
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 |Shank    |0.4352|0.4395| |Shank    |0.4352|0.4395|
 |Foot     |0.4014|0.4415| |Foot     |0.4014|0.4415|
- 
-  * Relative to the segment's proximal endpoint. 
  
 ==== Segment Radii of gyration ==== ==== Segment Radii of gyration ====
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 ==== Modifying the Inertial Values using the Adjusted Zatsiorsky-Seluyanov's parameters ==== ==== Modifying the Inertial Values using the Adjusted Zatsiorsky-Seluyanov's parameters ====
  
-Below is on image the default segment properties (on left) and the modified segment properties (on right). The modified segment properties reflect Zatsiorsky's adjusted segment properties for a female's right thigh.\\+Below images show the default segment properties (on left) and the modified segment properties (on right). The modified segment properties reflect Zatsiorsky's adjusted segment properties for a female's right thigh.\\
 \\ \\
  
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 |  __**ORIGINAL**__\\ This is an example of the **original** properties using Hanavan's geometric model.\\ {{:HanavanInertialProperties.png}}  |  __**MODIFIED**__\\ This is an example of the **modified** properties using De Lava's values.\\ {{:deLevaInertialProperties.png}}  | |  __**ORIGINAL**__\\ This is an example of the **original** properties using Hanavan's geometric model.\\ {{:HanavanInertialProperties.png}}  |  __**MODIFIED**__\\ This is an example of the **modified** properties using De Lava's values.\\ {{:deLevaInertialProperties.png}}  |
  
-1 - Change the **segment geometry** to CUSTOM_SEG+**1.** Change the **segment geometry** to CUSTOM_SEG
  
-2 - To modify the **Mass**, replace the mass factor from the current equation (0.1* Mass) to Zatsiorsky-Seluyanov mass value(For example: "0.1478 * Mass" for a female thigh segment).\\+**2.** To modify the **Mass**, replace the mass factor from the current equation (0.1* Mass) to Zatsiorsky-Seluyanov mass value(For example: "0.1478 * Mass" for a female thigh segment).\\
  
  
-3 - To modify the **Inertia Values**, the expression has to be entered as: "m*r^2"\\+**3.** To modify the **Inertia Values**, the expression has to be entered as: "m*r^2"\\
 Where m is the segment's mass parameter, and r is the IXX, IYY or IZZ radius of gyration parameter. The radius of gyration in De Lava's paper is presented as a percent of segment length, so this value must be multiplied by the length of the segment. Where m is the segment's mass parameter, and r is the IXX, IYY or IZZ radius of gyration parameter. The radius of gyration in De Lava's paper is presented as a percent of segment length, so this value must be multiplied by the length of the segment.
  
-For example, to use the Zatsiorsky-Seluyanov's Inertia Values for the right thigh for a female subject, the following expressions would have to be entered in the IXX, IYY and IZZ fields.+ For example, to use the Zatsiorsky-Seluyanov's Inertia Values for the right thigh for a female subject, the following expressions would have to be entered in the IXX, IYY and IZZ fields.
  
-IXX = ( 0.1478*Mass ) *((RTH_SEG_LENGTH * 0.369 )^2)\\ +  IXX = ( 0.1478*Mass ) *((RTH_SEG_LENGTH * 0.369 )^2) 
-IYY = ( 0.1478*Mass ) *((RTH_SEG_LENGTH * 0.364 )^2)\\ +  IYY = ( 0.1478*Mass ) *((RTH_SEG_LENGTH * 0.364 )^2) 
-IZZ = ( 0.1478*Mass ) *((RTH_SEG_LENGTH * 0.162 )^2)\\+  IZZ = ( 0.1478*Mass ) *((RTH_SEG_LENGTH * 0.162 )^2)
  
  
-4 - To modify the location of the **center of mass** according to Zatsiorsky-Seluyanov's parameters, replace the factor from the current equation (0.444004 * RTH_Seg_Length in the above image) with the corresponding Centre of Mass location parameter (for example: "0.3612 * RTH_Seg_Length" for a female thigh segment).+**4.** To modify the location of the **center of mass** according to Zatsiorsky-Seluyanov's parameters, replace the factor from the current equation (0.444004 * RTH_Seg_Length in the above image) with the corresponding Centre of Mass location parameter (for example: "0.3612 * RTH_Seg_Length" for a female thigh segment).
  
-  * The segment length (RTH_SEG_LENGTH) is listed under the Subject Data / Metrics tabs. This value is automatically created when a segment is created.+ The segment length (RTH_SEG_LENGTH) is listed under the Subject Data / Metrics tabs. This value is automatically created when a segment is created.
  
 ==== Reference ==== ==== Reference ====
visual3d/documentation/definitions/adjusted_zatsiorsky-seluyanov_s_segment_inertia_parameters.1721231105.txt.gz · Last modified: 2024/07/17 15:45 by sgranger