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Traditional FEM has started to use the explicit method for numerical integration due to its easiness of implementation and small size of memory requirement. The explicit method has a drawback of a small stepsize for stiff problems so that it is only good for short duration problems. Recently, the computational environment has been changed dramatically in the aspect of the size of memory and CPU speed. DAFUL has implemented a dynamic analysis algorithm, based on the implicit method. Implementation difficulties of the Jacobian matrix which is required in the implicit method have been overcome by efforts of expert VirtualMotion engineers. 64bit and low cost parallel processing computers have been used to execute DAFUL implicit solver to solve large scale problems for long duration analysis. Generally, it is believed that solutions obtained from an implicit solver have less noises and are more stable.

DAFUL has integrated multi-body system and structural system solvers very tightly. Therefore, an integrated problem can be modeled and analyzed easily. This results in very accurate solutions for a set of coupled problems of the rigid body motion and deformation. The results are very useful for system motion performance, stress safety analysis, vibration analysis, fatigue analysis occurred in the design process of many industry application.

DAFUL GUI provides a completely integrated modeling environment of components and system. Data for each component with mesh or rigid body or subsystem is managed independently so that each component can be modified and analyzed independently. When this component is needed to be a part of a system, there are many modeling user interface tools to handle many components effectively

DAFUL GUI provides open API for user Customization. The open API can be easily linked with MS/EXCEL so that a user may build an EXCEL environment which controls the DAFUL API in background.