MOLA Frequency Response Input Specification

Input Spec for the Finite Element Model

The input specifications given below are derived from the analysis responses. These inputs have been notched so that the overall response (using these inputs) is not higher than 6 g (about 350 pounds). The term notching refers to the graph of the input spec, which rather than being smooth, has notches where the spec is lowered. The levels are all protoflight because some MOLA-2 components were significantly redesigned from MOLA-1.

Clicking on the table's caption will bring up a graphical chart of the input spec.

Notched X Input Spec
Freq. (Hz) Level

5-12 0.75 in. DA*

12-20 6.0 g

20-60 5.43 g

60-100 0.5 g

**Notched X Input Spec**
Freq. (Hz)	Level
5-12	0.75 in. DA*
12-20	6.0 g
20-60	5.43 g
60-100	0.5 g

Notched Y Input Spec
Freq. (Hz) Level

5-12 0.75 in. DA*

12-20 6.0 g

20-60 4.64 g

60-100 0.7 g

**Notched Y Input Spec**
Freq. (Hz)	Level
5-12	0.75 in. DA*
12-20	6.0 g
20-60	4.64 g
60-100	0.7 g

Notched Z Input Spec
Freq. (Hz) Level

5-12 0.75 in. DA*

12-20 6.0 g

20-60 4.74 g

60-100 1.5 g

**Notched Z Input Spec**
Freq. (Hz)	Level
5-12	0.75 in. DA*
12-20	6.0 g
20-60	4.74 g
60-100	1.5 g

* DA = Double Amplitude. At the lower frequencies it is difficult to input an acceleration spec. Therefore, the test platform will be vibrated to a given displacement. In this case, that displacement is 0.75 inch total, or 0.375 inch in the + and 0.375 inch in the - directions.

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This page is maintained by Ryan Simmons, at Ryan.Simmons@nasa.gov.
This page was last updated on January 19, 1996.