Lotus Concept Valve Train
Lotus Concept Valve Train uses template driven data entry to design cam profiles. The motion can be specified from either the cam or valve end of the mechanism. Motion definition is via segmented polynomials with user controlled levels of derivative definition. On-screen results show the profile summary compared to user-definable design limits.
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Features
- » Interactive profile editing
- » Easy-to-use user interface
- » Fully integrated with Lotus Engine Simulation
- » Integrated spring design tool
- » Dynamic spring capability
English
Supported Technologies
Windows 95/98/ME,
Windows XP/2000/NT
Software
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Pricing
Users (# of seats)
lesoftsupport@lotuscars.co.uk
01953 608768
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Resources
Additional Product Information
The four available mechanism templates cover the majority of conventional valve train systems. Template types are 'Direct Acting', 'Centre Pivot Rocker', 'Finger Follower' and 'Push Rod'. The dynamic analysis mode enables both mechanical of hydraulic tappets to be simulated. Single- or twin-coil mechanical spring models are available, together with a gas spring model which includes mass transfer and variable gas properties.
A range of profile definition methods is available. Three standard segmented polynomials provide solutions for typical design including eccentricity-limited profiles and concavity limited profiles. In addition a user-defined polynomial is available with complete control over the number of segments and end constraints. Each segment can have additional mid points the values for which can also be defined in lift or any chosen derivative.
Additional valve lift profile definition is available through a range of data import options. Typically this would be used to import a table of angle and lift. Data imported in this way can be smoothed and differentiated to obtain the derivatives before performing a static analysis.
For each template the major geometry features are displayed on a scale drawing enabling dimensional data to be viewed and manipulated so that the impact on the mechanism can be assessed immediately.
The mechanism display is also used to display calculated forces and the results from kinematic analyses, whilst animation of the mechanism display provides additional insight into the variation of results with cam angle.
To extend the capability of Lotus Concept Valve Train a 1-D dynamic analysis module now provides an insight into the dynamic response of a multi-mass system to a prescribed camshaft input.
The dynamic modelling facility is presented in an interactive environment that is used for both data entry and display of results. The dynamic models can be created directly from the currently defined static data, providing rapid model generation mechanism.
Options exist to model either single or nested springs, mechanical or hydraulic tappets, and specific tappet types such as the cam profile switching (CPS) tappet. A bespoke time-marching solver ensures rapid run times are achieved with no requirements for an external 3rd party software solver.
Calculations can be carried out at either a fixed valve train operating speed, over a staircase of multiple speed points, or over a range of continuously increasing/decreasing speed.
All calculated results for links and masses can be displayed on screen during the calculation or listed/plotted once the run is complete.
Overall summary plots for items such as seating force, valve bounce, spring surge and tappet leakage can also be simply and quickly produced.