NSML

Format

Example

Definitions

Comments

1. Refer to Non-structural Mass in the User Guide for more information on the use of this card.
2. Non-structural mass in this format must be selected by the NSM (Subcase Information Entry) Subcase Information selector.
3. This entry will calculate an equivalent non-structural mass per unit area or per unit length using the lumped mass values provided.
   For "area" elements, the calculation is:(1)

   $$\text{NSM}\hspace{0.17em}\text{per}\hspace{0.17em}\text{unit}\hspace{0.17em}\text{area}=\frac{\text{VALUE}}{\sum _{\text{i}=1}^{\text{n}}\text{area}\hspace{0.17em}\text{of}\hspace{0.17em}\text{element}\hspace{0.17em}\text{i}}$$

   and for "line" elements, the calculation is:(2)

   $$\text{NSM}\hspace{0.17em}\text{per}\hspace{0.17em}\text{unit}\hspace{0.17em}\text{length}=\frac{\text{VALUE}}{\sum _{\text{i}=1}^{\text{n}}\text{length}\hspace{0.17em}\text{of}\hspace{0.17em}\text{element}\hspace{0.17em}\text{i}}$$
4. You cannot mix "area" and "line" elements on the same entry. The "area" elements are: CQUAD4, CQUAD8, CTRIA3, CTRIA6, and CSHEAR; and the "line" elements are: CBAR, CBEAM, CTUBE, CROD, and CONROD.
5. The value of the non-structural mass does not change during Topology Optimization.