LMS's software solutions for powertrain design

  • 26-Mar-2009 08:38 EDT
Valvetrain durability screenshot from LMS’ Virtual.Lab software.

LMS says its combination 1- and 3-D simulation solutions can be used to optimize powertrain architectures that contribute to reduced CO2 emissions and economize fuel while maintaining sound quality, reliability, and driving comfort. Its suite enables engineers to study powertrain systems from subsystems and components to the global engine architecture.

Encompassing such titles as Virtual.Lab Motion, Acoustics and Durability, Imagine.Lab Internal Combustion Engine, Fluids Systems, Powertrain Transmission, and Vehicle Thermal Management, the suite simulates complex dynamic engine performance and accurately predicts internal loads for determining fatigue life, vibrations, and engine-radiated noise, all handy characteristics for the evaluation of the crankcase, valvetrain, and timing chain.

In terms of analyzing mechanical and thermal fatigue, it predicts noise radiated throughout a full engine run-up, offering insight into general noise problems.

LMS says the suite enables the study of any kind of advanced hydraulic valvetrain architecture, from variable valve timing and cam phasing to electrohydraulic variable valve actuation systems.

Data from the simulation of high- and low-pressure injection components and systems (i.e., pump, rails, injectors) can be used to allow designers to assess potential injection flow rates and shapes, pressure losses, and thermal constraints, as well as acoustics and durability issues caused by high-pressure injection systems.

Engine thermal management aspects of the suite enable the rapid study of the influence of new heat management strategies and engine architectures on warm-up, fuel consumption, and pollutant emissions. The overall energy balance of an engine can be assessed by considering thermal interactions between the lubrication and cooling systems, the thermal engine, the combustion chamber, and the intake and exhaust pipes.

The optimization of architectures for aftertreatment and exhaust systems (such as urea injection systems, which are becoming more and more prevalent) allow designers to envision the interactions and cross influences between the engine and its environment (injection system, exhaust, combustion chamber, cooling system). The shell radiation of mufflers and the durability of seam welds can be determined and analyzed with the suite.

Global behaviors of the entire powertrain architecture, from low to high frequencies (>40 Hz), can be studied by accessing driveline, engine, and transmission models and components and by focusing on comfort, performance, losses, and NVH issues with Imagine.Lab Powertrain Transmission solutions. Also, the propagation or attenuation of noise in ducts for exhausts or intake systems can be predicted.

Other features allow designers to determine gear loads and contact, fatigue analysis for breakage at the base, and vibro-acoustic response and fatigue of the transmission housing.

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