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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 density |
model, solid, component |
Defines the density of materials which is used to calculate the object mass. The density value is displayed in the Density, g/mm3 field. Press Value from reference •the button is pressed — the density value defined for the selected material in the reference is used, •The button is not pressed – the density value is entered manually (the Density, g/mm3 field is editable). The density set for the model/component is used for all solids built immediately in the model/component for which their own density is not set. The model/component mass is calculated as the combined mass of all the solids and components contained in it. Based on the calculated mass of the model components and solids, coordinates of its center of gravity are determined. |
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By mass |
model, solid, component |
The total mass of the model (solid, component) is configured manually in the field Mass, g. The center of gravity of the model/component is calculated based on the current parameters of the components and solids contained in it. The density specified for the model/component is used for the solids with no density value set. Axial and centrifugal moments of inertia of the model/component are calculated as per central coordinate system. •Center of gravity coordinates. To do this, set the toggle switch Center of Gravity to position I (enabled) and enter the desired coordinate values in the field Coordinates. •Values of the axial and centrifugal moments of inertia in the central coordinate system. For this, set the toggle switch Moments of inertia, g*mm² to position I (enabled). The calculation values of moments of inertia will be displayed in the appearing table. Enter the desired values into the corresponding table cells (cells with centrifugal moments Jyx, Jzx, Jzy are not available for editing). Manual input of the moments of inertia for solids is not available, nor is manual input of the center of gravity coordinates. The center of gravity of a solid is calculated based on its shape, while the distribution of mass in the solid is considered homogeneous. |
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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, component |
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. |
To perform the recalculation of MCH, press Recalculate MCH 
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 MCX calculation was performed using the method By Mass, and the toggle switchMoments of inertia, g*mm² was in position I (enabled). To obtain extended CMP calculation results, use the command model MCH.
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 MCX models) moments of inertia of this model in absolute coordinate system. Moments are calculated based on the calculated coordinates.
See Also
