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User Subroutines
This manual describes the interface between Altair Radioss and user subroutines.
User Sensors
In Radioss, up to three types of user sensors can be defined.
User Sensor Example

ヘルプトップ
新機能
Radioss 2024の新機能を確認できます。
概要
Radioss^®は、衝突と衝撃ソリューションのための優れた陽解法有限要素ソルバーです。
Tutorials
Discover Radioss functionality with interactive tutorials.
ユーザーガイド
This manual provides details on the features, functionality, and simulation methods available in Altair Radioss.
リファレンスガイド
本マニュアルは、Radiossで使用することのできるすべての入力キーワードとオプションを詳細なリストで提供しています。
例題集
このマニュアルは一般的な問題のタイプに関して、Radiossを用いて解かれた例題を示します。
検証問題
このマニュアルでは、解析済みの検証モデルを紹介します。
よくある質問
このセクションでは、Radiossに関するよくある質問へのクィックレスポンスを提供しています。
Theory Manual
This manual provides detailed information about the theory used in the Altair Radioss Solver.
User Subroutines
This manual describes the interface between Altair Radioss and user subroutines.
- Global User Window
  With Radioss, it is possible to define a global user window. This is the most general interface between Radioss and external code.
- Material Laws 29, 30, 31
  Up to 3 material user’s laws (law 29, 30 and 31) can be defined for 3D, 2D solid elements and 3D shell elements. User’s laws for beam or truss elements are not available.
- Extended Material Laws
  In Radioss, 99 material user laws can be defined for 3D and 2D solid elements, connection element, and 3D shell elements.
- User Property Elements
  Up to 3 spring user properties (property number 29, 30, and 31) can be defined for spring and solid elements.
- User Sensors
  In Radioss, up to three types of user sensors can be defined.
  - Starter Subroutine LECSEN_USRn
    This subroutine read the user’s sensor input data. The number of cards and their formats are free.
  - Engine Subroutine USER_SENSn
    This subroutine performs a user-defined action with a given sensor.
  - Functions for User Sensors
  - User Sensor Example
- User Failure Models
  In Radioss up to 3 user’s failure models (USER1, USER2, and USER3) can be defined for shell and solid elements.
- Write in Output Files
  Some user subroutines do not pass the IOUT file descriptor and, thus, do not permit writing in a Radioss output file.
- Generate Radioss User Libraries
  Radioss user libraries are built on Windows and Linux with two different compilers: Intel Fortran or Gfortran.
- Initialize, Verify and Finalize
  The workflow in some user options may require initialization, verify during the run and finalize tasks in the Engine.
- Appendix

User Sensor Example

A sensor stores a maximum von Mises stress value (F).

CR =1 sensor parameter (read in Starter by sensor user’s subroutine LECSEN_USRm)

F = 1 sensor variable (written to sensor buffer by material user’s subroutine SIGESPnn)

Sensor is activated in F > CR. The activation time of the sensor is displayed.

Mesh example (4-node-shell element)

図 1. Loading Case: Imposed Velocities Applied on Two Nodes

Example Demo File

Before you begin, copy the file(s) used in this problem to your working directory.

5_user_sensors.zip