RADIOSS (Bulk Data Format), OptiStruct一、FEA Setup and Modeling[1 ] How can I apply multiple constraints or loads in a subcase?Put multiple loads in one load collector, and include that one load collector in the subcase. The same1. method can be used in the case of multiple constraints.Create load collectors for each and every load and constraint set. When you want to apply multiple loads in a subcase, a new load collector needs to be created with the LOAD card. Then, individual load collectors can be combined using the LOAD card. The LOAD card also enables you to associate an independent weighting factor to an individual load collector. In the case of applying multiple constraints, create a new load collector with the SPCADD card, and follow the same procedure as in the multiple load case. Once the combined load collectors are created, they can be applied in a2. subcase.一，设置有限元分析与建模[1] 如何申请多个约束在一个子用例或负载？1。
把多个负载在一个负载收藏家，包括该子用例中的一个负载收藏家同样的方法可用于多种 约束条件 创建每一个载荷和约束集负载收藏家当你想用一个子用例多个负载，一个新的集电极负载 需要用在LOAD卡创建的然后，个人收藏家负载可以组合使用LOAD卡在LOAD卡还可以 让您联想到一个独立的个体因素加权负载收藏家在应用多约束的情况下，创建一个新的负载 SPCADD卡收藏家，并按照在多工况相同的程序一旦联合负荷收藏家的创建，它们可以应用 在子用例2 】 How can I specify an enforced displacement in a subcase (or loadstep) in an OptiStruct input deck?There are two ways to do this:Create a single SPC definition containing the enforced displacement information and reference this1. within the subcase (loadstep) definition.Create an SPC, SPCD pair, with the SPC constraining the dof that is to have the enforced displacement and the SPCD defining the magnitude and dof of the enforced displacement. Both must be2. referenced in the subcase (loadstep) definition.2]我可以指定如何在输入中的一个。
ptiStruct甲板子用例(或loadstep)被迫流离失所？ 有两种方法可以做到这一点：Io建立一个单一的定义包含最高人民法院被迫流离失所的信息和参考在子用例（loadstep）的定 义这一点2O创建最高人民法院，SPCD与SPC制约自由度是有强迫流离失所和SPCD确定的规模和实施 的位移自由度一双两者都必须被引用在子用例（loadstep）的定义[3 】 What kinds of checking does the check run perform? What is the difference between the CHECK and ANALYSIS cards in the input deck?The check run checks for syntax errors, input errors （i.e. missing LOAD or SPC card in subcase）, and gives the recommended memory for the analysis or optimization run. All errors or warning messages will be output to the .out file.If the CHECK card is included in the input file, chosen as a Run Option in HyperMesh, or added as a run option on the command line, OptiSttuct will only perform the check run.If the ANALYSIS card is included in the input deck, chosen as a Run Option in HyperMesh, or added as a run option on the command line, OptiStruct will perform only baseline analysis and no optimization.Note: A request for a check run always takes precedence over a request for an analysis run, and a request for an analysis run always takes precedence over an optimization.【3】种什么样的检查检查运行是否执行？之间有什么检查并分析卡，在输入甲板区别？检查错误的语法检查，运行，输入错误（即缺少子用例LOAD或最高人民法院卡），并给出了 优化运行的分析或建议内存。
所有的错误或警告信息将被输出到出的文件如果支票卡是在输入文件作为在HyperMesh运行选项选择，或在命令行运行的选项添加， OptiStruct只会执行检查运行如果分析卡在输入甲板内，选择了作为一个HyperMesh运行选项，或在命令行运行的选项添加， OptiStruct只须执行基准分析，也没有优化注：为检查运行要求总是比一个请求的优先级运行的分析，并为分析运行的要求总是比一个优化 的优先级4】 How can I specify the temporary directory (where all of the scratch files are written) to runOptiStruct jobs?In an OptiStruct input, the complete path to the temporary directory (which has enough disk space for the scratch files) can be entered on the TMPDIR card. The TMPDIR card is available in HyperMesh in the control cards panel.Also, please note that when a temporary directory is specified, it is important to verify that the directory has correct read and write permissions.3]种什么样的检查检查运行是否执行？之间有什么检查并分析卡，在输入甲板区别？ 检查错误的语法检查，运行，输入错误（即缺少子用例LOAD或最高人民法院卡），并给出了优 化运行的分析或建议内存。
所有的错误或警告信息将被输出到出的文件如果支票卡是在输入文件作为在HyperMesh运行选项选择，或在命令行运行的选项添加， OptiStruct只会执行检查运行如果分析卡在输入甲板内，选择了作为一个HyperMesh运行选项，或在命令行运行的选项添加, OptiStruct只须执行基准分析，也没有优化注：为检查运行要求总是比一个请求的优先级运行的分析，并为分析运行的要求总是比一个优化 的优先级5 】 What is the OptiStruct equivalent of the Nastran K6ROT parameter?In Nastran, shell elements have five degrees of freedom per node, three displacements and two rotations. The K6ROT parameter provides an in-plane rotational stiffness (so-called drilling stiffness) accounting for the missing sixth degree of freedom. The absolute stiffness value provided by K6ROT is applied to all shell elements in the same manner. This way a singular stiffness matrix is avoided for shell models.In OptiStruct, the shell elements have a built-in drilling stiffness. Each element； s drilling stiffness is calculated from the element properties using a shape function. This way, the shell elements in OptiStruct have six degrees of freedom per node, three displacements and three rotations. The OptiStruct approach is more accurate, since it derives the drilling stiffness from the structural properties of each element. This leads to somewhat different results between OptiStruct and Nastran for shell models.An alternative shell element formulation is available in OptiStruct。