Summary
By using dedicated simulation models and leveraging its experience, LMS™
Engineering services experts help manufacturers reduce timing-belt noise and vibration issues and improve durability.
A timing belt transmits the rotational movement of the crankshaft to the camshaft in an internal combustion engine (ICE). It synchronizes the piston movement with the valve controls as
well as other accessories, such as the water pump. A typical timing-belt drive includes a crankshaft, one or more camshafts and a tensioner. Annoying noises and vibrations might arise during operation, which can impact durability.
The noise is directly related to the speed, width and pitch of the belt, revolutions per minute (RPM) and load variations.
Timing-belt noise problems are often caused by misalignment or improperly tensioned drives. LMS Engineering experts start by simulating the timing belt using advanced multibody model- ing software. They correlate results with measurements on the original design.
Afterwards, they perform a sensitivity- based optimization on the timing-belt design or tensioner. The optimal solu- tion can usually be found after changing the position of the tensioner or the preloading of the belt.
Timing-belt optimization
Multibody simulation model.
Reducing timing-belt noise and increasing durability with LMS Engineering
www.siemens.com/plm/lms-engineering Benefits
• Analyze the root cause of timing-belt noise problems
• Study new engine concepts using advanced dedicated simulation tools that reduce modeling time
• Design powertrain components while maintaining the dynamic-perfor- mance target
• Lower timing-belt vibrations
• Increase durability performance
Timing-belt optimization
A typical timing-belt optimization project is comprised of the following phases:
Model creation
LMS Engineering experts use LMS Virtual.Lab™ Motion software to create a parametric model of the entire timing belt. This multibody simulation software includes the powertrain dynamic simu- lator (PDS), a dedicated user interface for efficient modeling of powertrain components based on templates. The crank train and the valve train are usually separately modeled with LMS Virtual.Lab Motion or LMS Imagine.Lab Amesim™ software. The PDS can recover cyclic results from both simula- tions that can be used to develop boundary conditions.
Parameter evaluation
After validating the model with test results, LMS Engineering experts evalu- ate major timing belt behavior such as vibration and torque variations for different conditions. Critical span vibra- tions and impact forces are simulated in conditions, such as constant speed and run-up. Also, internal loads and accel- erations are evaluated. This step also includes a sensitivity analysis to deter- mine the most influential parameters and factors.
Simulation-based optimization In the last step, the timing belt is opti- mized using LMS Virtual.Lab
Optimization software. Parameters include material properties, position of the tensioner, preload of the belt, model stiffness and more. The end result leads to lower timing-belt vibra- tions and bearing loads. This reduces the noise and improves durability.
LMS
Powertrain dynamic simulator.
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