FEATURE AUTOMOTIVE ELECTRONICS
EVOLVING WITH THE TIMES Car safety to match car modernisations
As cars drive closer to autonomy, with the help of technologies such as ADAS and AI, security is a critical concern, to ensure a safe transition from the conservative mode of vehicular transportation. Christian Lynn, editor of Electronics, discusses Siemens’ answer to this issue with senior project manager, Kewal Shienmar
Christian Lynn: Electricification, the main movement for more electronics within contemporary cars, and autonomy - in ADAS for example - are all changing how we drive. Do you think developments such as these have encouraged the improvement of car safety, as with Siemens’ Simcenter Madymo software, to counteract key concerns?
Kewal Shienmar: Occupant safety has been at the forefront of car design and many of the ADAS features were already on the drawing board for car manufacturers many years before the emergence of autonomous car concepts. The contemporary car has become the proving ground where features such as automatic headlights, lane departure control, co-pilot, adaptive cruise control, accident avoidance and mitigation have been tested, matured and become standard features.
This is where Siemens comes in. The company’s occupant safety simulation software and testing facilities have been used by car safety engineers to design, test and optimise these features. Simcenter Madymo, with its suite of human and dummy models, has maintained a strong pace to, we hope, play a key role in the improvement of occupant safety, surpassing the requirements for the traditional crash dummy (Anthropomorphic Test Device - ATD). Amongst many other things, it allows safety engineers to consider, accelerate and design future occupant seating, restraint systems and airbags for
accelerate and design future occupant seating, restraint systems and airbags for the autonomous car.
changes in car security? For example, the autonomous factor that elicits control of the car when the driver is sleepy or
the driver is sleepy or unconscious: how can Simcenter Madymo put
Simcenter Madymo put concerns about its fallibility to rest?
10 NOVEMBER 2019 | ELECTRONICS / ELECTRONICS
CL: What does the Simcenter Madymo software improve to affect positive changes in car security? For example,
KS: Simcenter Active Human is a valuable tool that offers functionality to simulate occupants in all states of alertness and consciousness. This enables the automotive safety engineer to design, test and optimise vehicle safety controls and measures in a vast range of conditions, contributing heavily towards the mitigation of concerns regarding the fallibility of autonomous cars. Simcenter Madymo can simulate the impact of a car crash on the human body using the Active Human Model. The latest version offers solver run times, reduced by 28 per cent, as compared to past versions. A typical crash analysis in Simcenter Madymo may take about 15-20 minutes, whilst the same in a Finite Element (FE) code would take several hours. When using the Active Human Model, a simulation of a three second event can be completed in approximately two hours. Using Simcenter Madymo, researchers and engineers can rapidly model, analyse and optimise safety designs early in the development process. This reduces the expense and time involved in building and testing prototypes.
raise, in a manner similar to machine learning, or is Simcenter Madymo programmed by specialists?
CL: How do the Multibody, Finite Element and Computational Fluid Dynamics technologies assist in Simcenter Madymo’s performance? For those that aren’t aware about how these works and what their purpose serves. Does the software account for the factors that these technologies raise, in a manner similar to machine learning, or is Simcenter Madymo programmed by specialists?
KS: Multibody (MB) technology can be described as rigid or deformable bodies, interconnected by kinematic joints. Geometrical, material and contact properties can be assigned to the bodies to capture the physics of the system modelled. This computationally fast method of modelling complex dynamic systems is particularly well suited for performing large parametric design studies. Finite element (FE) codes are commonly used to predict the vehicle deformations during a crash. These codes can predict complex deformations accurately, but are expensive. Many market products are FE-based and focus on detail: iterative simulations can take a considerable time to run. The design of occupant restraint
systems requires that many different variables are analysed, resulting in hundreds to thousands of simulations. To do this in a timely manner demands fast simulations, so Simcenter Madymo is typically used for this. Simcenter Madymo combines MB, FE and computational fluid dynamics (CFD) technologies, integrated in one single solver, providing the engineer with full flexibility in modelling safety systems with the right balance between detail and speed. This enables the prediction of human body kinematics and injury risk, while the computational functionality of the software remains uncompromised.
Siemens
www.new.siemens.com
www.new.siemens.com
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