Modeling of Dynamic Systems

Sest, Inc. engineers gained extensive experience in modeling dynamic systems. Models are generally developed from the “bottom up” based on first principles.  Components are modeled separately, then combined into subsystems.  Subsystems are assembled to create an end-to-end model of a customer system.

Many different features of the system design, such as thermal, mechanical, structural, fluid, magnetic, and electrical, can be integrated and modeled using dynamic modeling principles. Nonlinear models and equations are used where necessary to achieve the desired model fidelity.  Electronic systems are modeled using components from available libraries. Results from multi-physics finite element models can be incorporated into dynamic models.

Sest recognizes the challenge of balancing model complexity and detail with speed of execution and ease of use. Sest works with customers to develop the right level of detailing to meet their specific needs.   Sest can also linearize dynamic models of nonlinear systems to allow usage of faster linear analysis techniques.

Sest engineers are capable of developing programs and interface for the dynamic aspects of the model and combine these with available on market software packages such as Ansoft, Simplorer, and Simulink in order to develop the model quickly. 

Models developed by Sest can be used for many purposes:

More detailed information on SDM capability is availed by requesting information from the company.


Sest has developed a dynamic model of the Stirling convertor system (see figure below) using Ansoft software.  The end-to-end model starts with the heat source and include models of all major subsystems of the Stirling Convertor, then capture the controller dynamics and finally the end user load.  The model can be set up in many configurations with multiple Convertors, different heat sources, and a variety of controllers and loads to understand the dynamic aspects of the system including the vibration.