为什么Patran没有op2文件产生呢？

本人初学，做了一个静力分析的练习，建模，网格划分，边界约束，材料设定，属性设定后，调用Nastran分析总是没有.op2文件产生，下面是命令行内容
xp系统，安装的2005r3版Patran,没有安装Nastran

$# The NASTRAN input file, test.bdf, has been successfully opened.
$#
$# Translating 50 elements from the element property region p1.
$#
$# 1 property regions translated.
$#
$# Translating 1 referenced material records.
$#
$# Translating 66 nodes from the entire model.
$#
$# Writing loads for Load Case : Default.
$#
$# Translating nodal constraints in load set : d1.
$# Writing interface element lbcs.
$#
$# Translating nodal forces in load set : f1.
$#
$# Translating nodal forces in load set : f1.
$# Total execution time in real seconds: 1
$# Total execution time in CPU seconds: 0.0630001
$#
$# End of NASTRAN input file translation.
$# MSC.Patran Nastran Preference 2005 r3 has released 1 license(s) to FLEXlm
$# at 14-Mar-07 21:01:25.
$# The translation has completed successfully.
$# Executing d:\MSC.Software\MSC.Patran\2005_r3\bin\exe\MscNastranExecute.exe