General Mechanical

General Mechanical

What is the difference between reduced damped system and full Damped system in a Modal analysis?

    • Rifaat93

      I was wondering what is the difference in a reduced damped system and a fully damped system in a modal analysis ?

      because i currently want to run a harmonic response analysis and use the damping from modal analysis ?

    • Sahil Sura
      Ansys Employee

      For the Reduced damped solver, first few complex damped eigen values are transformed by a small number of eigen vectors of undamped systems by Modal transformation. Once the undamped modes are evaluated, the equations of motion are transferred to the modal co-ordinates. i.e. This property enables you to solve and store a damped modal system as an undamped modal system.
      For Fully damped solver, full Stiffness, Mass and Damping matrices are evaluated.
      Both these are suitable for symmetric as well as asymmetric models. But each one has its own merits and demerits based on accuracy and solution time.
      You may refer to the following links for more information-
      Solver Controls (
      Modal Analysis (
      Thanks Sahil
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