Getting started with lotus suspension analysis 1 introducing lotus suspension analysis 3 1. Free download lotus suspension analysis and stimulation software. Design of formula sae suspension theory in practice. Camber gain is rarely linear and is a result of suspension design and geometry. This work presents a dynamical analysis of the transmissibility of an offroad vehicle rear suspension, which was developed in cefetrj for the minibaja saebrazil competition. Some software includes kinematic capabilities that simulate vehicle dynamics using the designed suspension. The suspension setup for a strutequipped car is very much like that of a double wishbone aarm suspension. Camber matters optimizing track performance for strut. Learn camber, caster, and toe suspension alignments. Then, by using average tire temperatures, you can balance the handling and maximize total vehicle traction in the same way. I started with the front and modelled it all in solidworks and suspension analysis software.
Optimumkinematics developed by optimumg engineers is a suspension and design analysis software. Racewise provides the technical understanding of suspension and tire performance that racers must have in order to make no guesswork decisions. General terms in suspension system and wheel assembly camber angle camber angle is the. Actually, a passive double wishbone suspension system with variable camber angle has been designed, analyzed and subsequently manufactured. Lotus cars ltd permits licensees of lotus cars ltd software products to. A variation on this, in the form of a trailing arm with camber links has also been designed and analysis of the lateral, vertical and longitudinal forces acting on the components have shown this system to be a viable option. Design and analysis of suspension system for a formula. See all 15 photos roll center calculatorthis is a simple twodimensional front suspension layout program. While the eyecatching tuning phenomenon known as demon camber or hella flush doesnt provide much in the way of performance in fact it hurts it its extreme styling brings the viewers eyes into relation with the concept of camber. Keywordsdouble wishbone, mc pherson, camber, ackermann, roll center, quarter car modelling, finite element analysis. Suspension key performance indicators kpis can be used to understand how a suspension system will perform under different driving conditions, e. Stars pro provides a convenient way to record suspension jig lengths, adjustmentresult ratios one turn of the left front pushrod adjuster equals 5mm ride height change and 0. Secondly, the ansys stress analysis software was used to analyze the.
I want to focus on the c4 suspensions, stock tri5 suspensions, and a stock suspension with dropped spindles or cut springs, and taller balljoints. Autowares racing and performance tech site software for auto racing and high performance cars data acquisition systems new and used engineering services and live seminars on performance and racing technology all types of tech info on racecar engines, chassis and suspension setup for road. The old model remains at the back of the drawing, you can use it as a guide when making adjustments to the layout or visually compare how the changes will perform when the suspension is in motion. Analysis of atype lower suspension arm analysis of the atype lower suspension arm is required to find out the maximum stress weaker section and maximum deflection in the arm. Number of iterations was done in lotus for optimizing the suspension performance. Vehicle ride and handling analysis introduction this tool lets you. Design and optimization of formula sae suspension system.
Designing and analysing a suspension system for a vehicle. The design of upper aarm is modified to control the camber angle by retraction and extension as shown in fig. Camber angle is the angle between the plane of a wheel and the vertical. Download lotus suspension analysis software baja tutor. Automatic generation of roll centre and swing axle lengths. You can also use this function to compare front and rear suspension although be careful as only the model at the front of the drawing is saved within. Suspension geometry part 1 camber, toe, caster, kpi, scrub radius sk8215. Stop guessing and start winning learn the facts of front suspension geometry with this informative cdrom computer software. Design, analysis and optimization of suspension system for.
This mechanism was modeled in visual nastran software and kinematic analysis was presented. Getting started with lotus suspension analysis about this guide iii about. Racewise provides the technical understanding of suspension and tire performance that racers must have in order to. The designed active suspension system includes, modified upper aarm and tie rod as compared with the existing passive system. It really does depend on a multitude of factors, including driver input and what heshe prefers. A double wishbone suspension front suspension with pushrod was analyzed in lotus shark software to obtain the most. Suspension adjustments stars pro provides a convenient way to record suspension jig lengths, adjustmentresult ratios one turn of the left front pushrod adjuster equals 5mm ride height change and 0. Analysis was done in lotus shank suspensi on analysis software, from the analysis the designs are said to be suitable for the end application. In order to produce the effect that would be faced by the suspension system when the real formula car will be running on the track during the event. Initially the model had 2 actuators that raised and lowered the wheels with a static frame.
Typical rear suspension screen, here analyzing an angled 4 link rear suspension and driveshaft movement and u joint angles. I want to focus on the c4 suspensions, stock tri5 suspensions, and a stock suspension. If one wheel moves over a hump or dip in the road then the axle will tilt causing both wheels to become cambered. Mitchell, with help from carroll smith, created the first to my knowledge suspension geometry analysis software program call racing by the. The classis 60s sports and racing car rear suspension. Camber angle alters the handling characteristics of a suspension system. Suspension geometry optimization and analysis of steering. Suspension geometry part 1 camber, toe, caster, kpi. Now you can get all the racewise chassis school material in an easytouse software program for your home computer. The plotted parameters are those which are tweaked by the user to enhance performance e. Dec 07, 2014 the first is a new threepart section on basic race car setup hosted by grandam driver david donohue and jay oconnell, technical director for rahal letterman lanigan racing. Wheel camber is zero irrespective if the vehicle is stationary or moving round a bend in the road.
Susprog3d is the premier kinematic suspension design and analysis tool. Lotus engineering suspension analysis lsa, the commercial version of software from lotus engineering in the u. Suspension geometry optimization and analysis of steering knuckle for weight reduction. In terms of racing applications, a driver that tends to enter the corners aggressively, carrying a lot of speed will benefit from more negative camber, as the increase will. See all 15 photos roll center calculatorthis is a simple. The graph below shows a camber plate adjusted for full negative camber versus a camber plate adjusted to full positive camber, but with camber bolts used to once again get zero camber. Suspension design software is invaluable in car or truck design as it does the heavy lifting when it comes to the many iterations of manual calculation that are usually needed to find the ideal geometry. The wheel was placed on a hydraulic jack along with a quarter car double wishbone suspension system. Lotus shark suspension analysis software is used for dynamic analysis of suspension. Proceedings of 105th the iier international conference, bangkok, thailand, 5th6th june 2017 102 design and analysis of leaf spring for solar vehicle 1may mya darli cho, 2htay htay win, 3aung ko latt 1,2,3 department of mechanical engineering, mandalay technological university, mandalay, myanmar email. When stationary, the tire maintains a static camber angle, whereas when the car is cornering, due to body roll, the contact patch is reduced. Also analysis has been done on simulation software. Then i just duplicated the same for the rear and then moved on to other things.
Design, analysis and fabrication of rear suspension system. It does not generate curves, it just moves your hardpoints and tells you what the new toe, camber, jounce etc is. Manufacturing is done by major machining processes like laser cut, grinding, welding, lathe operations, etc. Front and rear suspension analysis simulation software program. With care and dedication this is capable of excellent results. Adjusting the camber too much either side of this reference can be detrimental to aerodynamic performance as the position of the tyres wake can play havoc on how airflow is. The inclusion of bush compliance in the model at this stage will depend on whether the bushes have significant influence on geometric changes in the suspension and. Basic chassis set up 1 camber, castor, toe, and ackerman. Getting the best alignment dynamic camber analysis. Camber is the angle at which the wheel and tire stand relative to the road assuming it is perfectly flat. To verify that, i compered my results with the results obtained using lotus suspension analysis software. Paper incorporates design and analysis of aarm and knuckles for the suspension system for best possible results.
Complete graphs and reports are included, and several new. A tyre with camber will generate a lateral force known as camber thrust. Static camber, bump camber, camber compliance and steering geometry all combine to give a resultant tyre camber to road under any driving scenario. The suspension is designed for a rough terrain giving optimum camber, caster, toe, antidive, roll centre and ackermann geometry variations. Maximum stress and deflection in the lsa can be found by using software. Suspension optimization design and virtual prototype simulation. This software is specifically designed with a userfriendly interface that makes the process of computer aided suspension design and analysis much faster and more convenient. The aim is to compete in sae india baja competition.
Suspension geometry characteristics of a live axle are as follows 1. As it can be sees, the bigger the negative camber is, the greater the tire. This mechanism was modeled in visual nastran software. Compliance analysis edit the compliance of the bushings, the body, and other parts modify the behaviour of the suspension. Design, analysis and manufacturing a double wishbone. A passive double wishbone suspension system with variable camber angle has been designed, analyzed and subsequently manufactured. Since we have so many threads about different suspension geometries and the discussion is scattered and offtopic in a lot of them, ive started this thread to discuss the analysis of various suspension geometries and their differences. The easiest way to envision what camber looks like is to view the wheel and tire head on. This module uses a comprehensive nonlinear vehicle model. Understanding caster and camber for suspension setup. Upper lateral link, lower parallel links, twin trailing link rear a variation of the reversed lower aarm style. A finite element model was developed to identify the critical points of the structure.
Software for suspension analysis automotive suspension. It will let you predict and understand the effects that various modifications have on handling, performance and lap times. A marketleading application for suspension modeling and design from the worldleaders in vehicle ride and handling. Suspension key performance indicators kpi suspension. Autoware autoware inc front suspension geometry software. Racewise rwfront front suspension geometry software. Suspension geometry an overview sciencedirect topics. Suspension geometry analysis please avoid offtopic posts here. Design and analysis of leaf spring for solar vehicle proceedings of 105th ththe iier international conference, bangkok, thailand, 5 6th june 2017 104 3 nebt 3 6wl. First of all you need to define your broad parameters based on the requirement of your vehicle, once you are done with your performance parameters for the suspension camber, toesteer, ro. The software allows the user to visualise the suspension kinematics and to modify the suspension geometry. The active suspension system prototype as shown in fig. Caster on rear independent suspension automotive suspension. The geometry of the suspension has been modelled in commercial software package lotus shark.
Similarly, for controlling the toe angle, the tie rod is modified for retraction and extension operation as shown in fig. Keywordssuspension molding, double wishbone, variable. It is described as positive when the top of the wheel leans outward and negative when the top of the wheel leans inward. But since the primary effect of castor, kinematically, is to camber. For windows 7, 8 and 10 with opengl see the faq for more details faq for more. Dynamic camber is the static camber plus or minus the camber gain. Design, analysis and optimization of suspension system for an.
Getting started with lotus suspension analysis lotus cars. Free download lotus suspension analysis and stimulation. Camber is a bit more difficult to tell you to always go this way or that. Later on the assembly of all parts and mono spring rocker arm front suspension system were designed. Caster on rear independent suspension brianpetersen mechanical sep 16 11. It will let you predict and understand the effects that various. A suspension analysis program the ohio state university. The suspension was also simulated in lotus suspension analysis software for obtaining the hard points and checking the articulation of the suspension.
The finite element analysis of various suspension components are done in commercial software ansys 14. The suspension analyzer does a complete 3d suspension analysis, including bump steer, ackerman, caster gain, anti dive, tire scrub, camber gain and much more. Mar 31, 2019 free download lotus suspension analysis and stimulation software. Camber inclination of the wheel plane to the vertical, negative when the. F1 suspension geometry henry february 11, 2016 at 3. Apr 19, 2005 here are the software programs that are most appropriatefor the circle track racer. Camber adjustment location on top, bottom or both links. Tyre camber angle to the road surface is one of the key variables which influences tyre performance. Since the results were the same and my model was correct, i decided to use this model.
Optimization of double wishbone suspension system with. Pdf design, analysis and manufacturing a double wishbone. Design, analysis of atype front lower suspension arm in. As a track enthusiast with 9 years under my belt, toe out at the front wheels has always helped cornering ability. Suspension download lotus suspension analysis software. Active camber and toe control strategy for the double. The analysis for these parameters can be done graphically, or by cad, or by the use of kinematics software. Volkswagen beetle twin trailing link suspension and steering. You adjust camber and tire pressures using tire temperatures. Suspension key performance indicators kpi suspension designer. Mar 03, 2016 designing and analysing a suspension system for a vehicle. Susprog3d is a complete 3d software package for the design, setup, evaluation and visualization of race and road car suspension systems now with support for 30 different suspension types. The teams optimise the aerodynamics of the car around a specific camber angle in the wind tunnel and on cfd design software. Here are the software programs that are most appropriatefor the circle track racer.
A variation on this, in the form of a trailing arm with camber links has also been designed and analysis of the lateral, vertical and longitudinal forces acting on the components have shown this. Lower lateral link, upper reversed aarm, twin trailing links rear a variation on the above. Vehicle ride and handling analysis maple programming help. The output from this type of analysis is mainly geometric and allows results such as camber angle or roll centre position to be plotted graphically against vertical wheel movement.
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