Lotus Engineering Software - All in One
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The auto industry has long been known for its use of specialised, proprietary codes. However, some of this software is becoming commercially available. For example, Lotus Engineering (Norfolk, UK) has released its Shark LSA (Lotus Engineering Suspension Analysis) package that it has been developing internally for 15 years. In addition, three other packages are now commercially available: Lotus Engine Simulation to predict the performance of two or four-stroke engines; Lotus Vehicle Simulation allows users to build a virtual vehicle and analyse fuel consumption, exhaust emissions and fuel consumption over a range of fixed-speed runs to accelerations; while LotusConcept Valve Train offers kinematic performance analysis of value-actuation mechanisms.
Responsible for the vehicle dynamics of many of the world’s class-leading passenger cars, Lotus’ ride and handling team was integral to the development of LSA and continues to use the package. Intended for the design and analysis of suspension geometry, it provides templates that define how the suspension is connected to the vehicle and in which you supply dimensions and loads. More than 20 standard templates describe common suspension layouts including double wishbones, Macpherson struts, trailing/semi-trailing arms, pus rod as well as and H-frame configurations, while a user-definable template enables designers to construct unique configurations. An optional module permits the addition of compliant bushes, the rate, position, and orientation of which can easily be modified to allow effects such as lateral force steer due to compliance to be included in the analysis. Suspension characteristics include camber, castor, toe, kingpin angles as well as roll center positions, swing axle lengths, damper ratios, anti-dive, anti-squat and ackermann.
Results can be displayed either graphically or numerically over specified bump, rebound, roll and steer articulations. External forces can be applied to the suspension as well as suspension spring loads, anti-roll bar forces and the influence of steering rack coupling and compliance.
Calculations and results are updated instantaneously after each design change. Result curves show how the suspension geometry changes with the variation of a particular element. An optional module allows users to add stiffness properties of compliant bushes to calculate compliant displacements and bush forces.