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CMP setting and recalculation |
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Elements of the section CMP calculation on the Parameter panel can be used for parametrization of the object’s CMP calculation.
Choose the required method from the Method of calculation list and configure parameters for the selected method. The supported options are listed in the table.
Description of CMP calculation methods
Method |
Available |
Parameters configuration |
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By data |
solid, component |
There are no parameters configuration elements, since parent CMP parameters are used: •for solids – parameters of the parent model, •for components – parameters of the component file. |
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By source mass |
component |
The value of the total mass of the component is taken from the source file and is displayed in the Mass, g field. The field is not available for editing. The center of mass of the component is calculated by the current parameters of the components and bodies included in it. In this case, for those bodies that are not given their own density value, the density specified for the component is used. Axial and centrifugal moments of inertia of the model/component are calculated in the central of mass coordinate system. •Coordinates of the center of mass. •Values of axial and centrifugal moments of inertia in the central coordinate system. |
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model, solid, component |
Specifies the density of the material, which is used to calculate the mass of the object. The density value is displayed in the Density, g/mm3 field. The Value from reference •button pressed — the density value specified for the selected material in the reference book is used, •button is not pressed — density value is entered manually ( the Density, g/mm3 field is available for editing). The density specified for a model/component is used for all bodies built directly in the model/component that are not given their own density or mass. The mass of a model/component is defined as the total mass of its constituent bodies and components. Based on the calculated masses of the components and bodies of the model, the coordinates of its center of mass are determined. |
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model, body, component |
The value of the total mass of the model (body , component) is set manually in the Mass, g field. The center of mass of the model/component is calculated from the current parameters of its components and bodies. In this case, for those bodies that are not given an eigenvalue of density, the density specified for the model/component is used. Axial and centrifugal moments of inertia of the model/component are calculated in the central of mass coordinate system. Manual input of moments of inertia and manual input of center of mass coordinates are not available for bodies. The position of the center of mass of the body is calculated from its shape, the mass distribution in the body is considered to be uniform. |
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By data |
solid-instance component- |
This calculation method is only available for a solid or a component that is an array instance and means that the instance CMP are the same as the source array object CMP. The method By copy source data is used for array instances by default. |
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By source item |
model, |
This calculation method is available for a model/component that is option. There are no parameters configuration elements, since the mass-inertia properties of the calculated variant are considered properties calculated for the source execution. |
button
To perform the recalculation of CMP, press Recalculate CMP
button next to the field Method of calculation in the section CMP calculation. After the calculation is complete, the information window with the calculation results will appear on the screen.
In the Information window, brief results of the calculation — (mass, volume, surface area, center of gravity coordinates) are displayed. The values of the axial and centrifugal moments of inertia can also be displayed if the CMP calculation was performed using the method By Mass, and the toggle switch Moments of inertia, g*mm² was in position I (enabled). To obtain extended CMP calculation results, use the command model CMP.
Notes on the model CMP calculation
•If a model contains no solids, e. g. only curves, then the calculated mass of such a model will be zero. In this case the mass should be configured manually. For a component, this operation can be performed in its source file or in the assembly.
•The manually configured mass of a component (in the source file or parent model) will be considered constant while the component or any of its parts is used in the model. If the model is edited in such a way that the component solid is no longer there, then its mass will be zero. For example, after creating a hole in the model that passes through the component, the mass of the component will not change, while after deleting the component through cutting by a section plane the component mass will be zero.
In a model, a solid the mass of which is set manually obeys the same rules that apply to components.
•If a Boolean operation is executed in the model impacting solids of two components, then the mass values of those solids will not be considered in the model's CMP calculation. Instead, the mass of the solid resulting from the Boolean operation will be taken into consideration. The CMP calculation parameters of this solid can be changed if required.
Notes on the model inertia characteristics calculation
Manually entered coordinates of the center of gravity for the model are not considered in the calculation (using the command CMP models) moments of inertia of this model in absolute coordinate system. Moments are calculated based on the calculated coordinates.
See Also
