Maximum Strength Preferred Angles Catalog

Licensing
  The Maximum Strength Preferred Angles Catalog is only available with a product license.
The different preferred angles saved in the catalogs allow the user to define the force that can be exhorted in a specific posture according to the color of the range of motion zone as well as the score assigned to the zones.

Open Human Builder and refer to Opening the Standard Human Catalog to open the optimized posture preferred angles catalog.

  1. Double right-click on the manikin, and select Properties.

  2. On the Coloring tab, select Active.

  3. Under Elements to color, select Surface.

  4. Click Apply, then OK.
 

Range of the Angles
 
The force given by the references is assigned to an angle. However, to ease the use, the angles between -5 to +5 degrees are varied. During simulations requesting the arm in movement, the color associated to the angle is more perceptible. The table below shows the range of the elbow angles (in degrees). Figure 1 illustrates an example of the colors associated to the maximum strength.
 
Elbow Angle References Minimal Angle of the Elbow (suggested) Maximum Angle of the Elbow (suggested)
0 0 5
30 25 35
60 55 65
90 85 95
120 115 125
 

Color of the Angles

  In descending order, the colors representing the force are shown: Green for maximum force and bright red for the lowest. According to the reference, the right and left segment are not necessary the same color in different force angle.
  1. Green
  2. Yellow
  3. Orange
  4. Dark Red
  5. Bright Red.
 

Blue Color
  The blue color does not represent the value of the references. Blue represents the average in Kg between two angles or, if no average is possible the value 1 is written. This value is assigned when it is impossible to target a number in the tables of the authors mentioned in the description. By using the optimization in the IK Behavior function (fig.) it is possible to optimize the posture of the manikin regarding the score. To be able to use this function, all the preferred angles must have a score (different than 0). Also, the inscription of a value between the angles eases the movement of the arm without interruption during simulations. That way, the average is inscribed between the angles. Also, to the last neither value, i.e. after the 125 degree angle, since it is impossible to inscribe an average nor a value equal to zero for the continuation of a simulation, the value kept is equal to 1 kg.
 

Forces of the Angles
  The force of the angles is represented in Kg in order to ease the interpretation of the user and to standardize the data.

References

 

 MIL-STD-1472D, Military standard, Human engineering design criteria for military systems, equipment and facilities. Department of Defense, USA, 1989.

Henry Dreyfuss Associates, Human Scale, MIT Press, Cambridge, 1991.

Weimer, J. Handbook of ergonomic and human factors tables, Prentice Hall, 1993.