Simcenter Madymo improves Active Human model for enhanced safety simulation

Siemens Digital Industries Software has announced the availability of the new version of Simcenter Madymo software with significant improvements for speed and accuracy. Used for occupant safety modeling, Simcenter Madymo can simulate the impact of a car crash on the human body using Simcenter Active Human software. 

The latest version offers solver run times reduced by 28 percent as compared to past versions. A typical crash analysis in Simcenter Madymo may take up to 15-20 minutes, whilst the same in a finite element (FE) code could take several hours. When using Simcenter Active Human, the simulation time of an event of three seconds will take approximately two hours to complete, when in the past it might have taken up to four hours. 

Simcenter Madymo is a global standard software for analyzing and optimizing occupant and pedestrian safety designs, traditionally focused on the development, testing and validation of passive safety systems of vehicles, analyzing pre-crash and in-crash scenarios. Recently, there is increased importance of analyzing non-crash scenarios as well, especially the analysis of the occupant seating positions, which is affected by the maneuvers of the automated driving vehicle. 

Simcenter Madymo combines Multibody (MB), Finite Element (FE) and Computational Fluid Dynamics (CFD) technologies integrated into one unique multi-physics solver, which researchers and engineers can use to rapidly analyze and optimize safety designs early in the development process. This can reduce the expense and time involved in building and testing prototypes. 

The new update also reduces solver run times and includes many new features and improvements. With the improved core of the code, Simcenter Madymo solver run times can be reduced by 28 percent, compared to the previous version. A typical crash analysis in Simcenter Madymo may take about 15-20 minutes whilst the same in a FE code could take several hours.

Simcenter Madymo contains an Simcenter Active Human which is a digital twin of an average adult male. This model simulates a human body reacting to movements whilst maintaining posture with the use of a unique musculo-skeletal form guided by a control system of sensors and actuators. 

This version of the Simcenter Active Human model has been extended with new features including an active shoulder control, strength scaling, and drowsiness, sleep and unconsciousness modelling. These new features help customers to accurately model human-like reactions, which are needed for a safer autonomous vehicle design. In addition, faster runtimes allow users to more easily and frequently model varying car seating configurations to rapidly build an accurate analysis. 

Active shoulder control enhancements allow for lane change studies, as Simcenter Active Human resists lateral motion in a more human-like behavior by holding the steering wheel at scalable strength levels. With enhanced strength scaling, the user can assign varying levels of occupant strength to better reflect the ranges in human resistance to motion. 

Unconsciousness modeling gives the ability for users simulate the behavior of an occupant who is drowsy, asleep or unconscious. This functionality greatly assists the development of autonomous vehicles where the occupant is no longer in control and the car is at level 5 of automation (fully autonomous).

For customers working in passive safety, the new Thor model is certified to the latest NHTSA requirements. The thorax geometry and instrumentation has been updated for increased accuracy and robust contact with belts and airbags. 

The Thor model is now available in US-NCAP and EuroNCAP variants, with the former having legs conforming to the latest hardware standards and the latter with Hybrid-III legs. Facet versions of both variants are also available. The Hybrid-III line has also been updated with the latest injury criteria to support the assessment of the BrIC and the EuroNCAP iliac force drop criterion for submarining.

To support rapid developments in the fields of integrated safety and pre-crash analysis, the Active Human Model has been extensively developed and now offers active shoulder control, strength scaling and unconsciousness modelling. XMADgic provides specialised support for pre-simulating the model, and the solver has been better optimised to support postprocessing of large models with long simulation times, in response to customer needs.

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