16a - Using Units in Mechanica - Lecture

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Theory and Mechanica Model Topics  Using Units in Mechanica – Lecture  UsingUnitsinMechanica.mp3 

Using Units in Mechanica
Understanding and using appropriate unit systems in Pro/MECHANICA is a critical skill.
Structural unit systems:
    

Mechanica and Unit systems
 

Force Mass Length Time Any three define the fourth o Newton's second Law: F = ma

Unit systems determine default results reporting Can be changed from default

Thermal unit systems


Temperature

Establishing Unit systems
  

Templates User defined Software default

Changing the unit of a Load.

Lecture Notes 

Pro/ENGINEER Wildfire Unit Systems A unit system is made up four separate basic units for a structural system: force, mass, length, and time. Defining any three of these units will define the fourth unit according to Newton's law, F = ma. For thermal systems, the unit for temperature must be defined. Establishing Unit Systems

When creating models in Pro/ENGINEER, there are several methods that can be used to establish the unit system that will be assigned to the model.


 

Use of templates: When using templates for the creation of part or assembly files, the unit system in the model will be established by the unit system in the template. User defined: The user can select from one of seven unit systems included with Pro/ENGINEER , or he or she can create a custom unit system. Software default: In the absence of any guidance from a template or the user, Pro/ENGINEER will default to the IPS (inch, pound mass, second) unit system.

Mechanica and Unit Systems The principle unit system of a model being analyzed is important because it determines the default units in which the analysis results are calculated and reported. You can override these default units when you are creating loads, constraints, and defining results windows. In the case of results windows, it is a simple as selecting the units you want to use from the Units drop-down menu in the Result Window Definition dialog box. You can set the units for loads and constraints independent of the default unit system of the simulation model by selecting the units from a drop-down menu in the Load or Constraint dialog box. You can also convert a value from one unit system to another by right-clicking the field and selecting Convert to Unit.  

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