Very latest technical knowhow on suspension set up and testing for racing and performance road cars. The roll center for this type of suspension is found by creating a line that connects the center of the front attachment point to the center of the rear attachment point looking from the side of the car. Design and optimization of formula sae suspension system. Software for designing and analyzing suspension systems and geometry. Mitchell, with help from carroll smith, created the first to my knowledge suspension geometry analysis software program call racing by the numbers.
Greatercaster,greatercasterlead % when%cornering,% z a p z v v v p p u v z v v p x d z v v p. Free tools and software for race car, sports car and offroad vehicle design. Pressing the edit button immediately switches to edit mode listing more details about the dimensions of the model and allowing you to alter the model by dragging any of the tether points. Software for auto racing and high performance cars. Software for suspension analysis automotive suspension. One of the most common questions we get about suspension setup and tuning is how 4link geometry affects the performance and handling of a vehicle. All types of tech info on racecar engines, chassis and suspension setup for road. First, lets start by looking at the suspension movement and the tools available to make your life easier.
Universal suspension geometry software race wise by afco. In this article well cover what we consider to be the three most important elements. Im doing a chassis design project for my major project in my degree 2nd year. With this calculator you will see how bump and droop can affect camber. The design teams in the many motorsport categories are constantly developing new solutions with one single goal in mind. Tune to win is similar to chassis engineering in scope but probably more indpth. Each car needs to be evaluated for where it is to be raced and then set correctly. We can reduce understeer and oversteer characteristics with the adjustments of antiroll bar sway bars, bump and rebound, ride height, spring rates, corner and static weights.
The roll center calculator plus is just the front suspension screen, rear suspension screen, and the transition handling screen of the circle track analyzer. Oct 06, 2014 race car design is one of the most fascinating and yet one of the most complex aspects of the racing world. The top arm should be approx 23 the length of the bottom arm. There are plenty of theories behind proper suspension geometry for a race car, however it becomes much more complex to analyse these mechanics at f1 level as downforce the biggest performance differentiator in the sport plays an important role in the design calculations. 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. We have developed the procedures needed to work out a set up for your race or performance car. So a ride height adjustment to your race car, or a roll centre geometry change is a very valid tuning device. Racewise provides the technical understanding of suspension and tire performance that racers must have in order to make no guesswork decisions. The roll center is located where this line crosses the vertical center line. Easy and effective virtual prototyping of vehicle suspensions.
Or, maybe you are looking for a little more forward bite. But my advice is to use a specific software for suspension design and simulation. Useful for any racing vehicle weighing 1800 4000 pounds stock car, late model, sportsman, truck, sprint, modified, hobby stock, etc. Links may be made to the site, but the product may not be redistributed in any way other than by direct download. If you purchase a new race car, or a car from another race team, the car will not be set up. Here are the software programs that are most appropriatefor the circle track racer. The chassis movement control allows you to raise and lower the chassis and also rotate the chassis by moving the mouse or your finger side to side.
Theres an art to setting suspension up, and without it your car will drive horribly. The options for entering your geometry specs include. See all 15 photos roll center calculatorthis is a simple twodimensional front suspension layout program. Easily and effectively create vehicle suspension designs, that can be used to help make design decisions at the initial concept stage up to and. Front suspension geometry pro incredible, amazing and astonishing, you have to see it to believe it. Then, by using average tire temperatures, you can balance the handling and maximize total vehicle traction in the same way. Useful suspension analysis can be done from a bottom up approach, in which individual parts of the suspension mechanism are defined, and then loads are applied, or top down, in which the suspension is abstracted out to an overall axle performance for a given load and slip ratio, or anywhere in between these two extremes. This involves placing the force application points g and h on the centre of gravity. Race car suspension setup smithees race car technologies. It is simplicity itself and a great place to start learning about suspension geometry. Its important to make sure everything is dialled in perfectly, otherwise your car will drive in a direction you dont want it to, it will chew up tyres and it will make your car pretty damn unpleasant.
No part of the program or code shall be reproduced for commercial use. Elmer is a free open source multiphysical simulation software. 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 calculations vary from motion ratios, to spring stiffness, to wheel loads. 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. Afco rwfront suspension geometry software race wise. The roll center is located where this line crosses the vertical center line of the axle and is centered between the rear wheels. Bottom line, suspension kinetic and kinematic design exist to control the distribution of load through the 4 wheels, minimize load variation, and control the wheels position in 5 degrees of freedom. 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 the url.
Your software has eliminated that tiresome, mistakeprone task. How to build a racing car follows the design and construction of the fvt05, a car built for the australian formula vee racing series. When designing a front suspension, geometry layout is critical. At some point you will want to enter your own suspension geometry data or even just just view the current model in more detail. Susprog3d is the premier kinematic suspension design and analysis tool. Despite both having four wheels, kart chassis are quite different to car chassis the kart chassis itself effectively forming the suspension members and springs, having a very wide track to wheelbase ratio, and completely lacking a differential. This program is provided free of charge for personal use in the assisting of suspension calculations. Car design tools for chassis, suspension, aerodynamics. Suspension geometry part 1 camber, toe, caster, kpi, scrub radius duration. Rear suspension geometry is your car loose and cross weight nor springs will fix the problem. The majority of our work has been in the drag racing industry but simulation covers all racing industries in particular aerodynamic cfd work. Thilenius group thilenius is no armchair bench racer, he has a history glittered with racing accomplishments from around the world making him a keen advisor to help us navigate the complex world of chassis and suspension geometry. You can get a long way without knowing specific tire data, and design a suspension that wont screw ya.
Id agree that if you were going to buy one book, the herb adams book would be it to start with. Now you can get all the racewise chassis school material in an easytouse software program for your home computer. Autoware autoware inc front suspension geometry software. Mitchells racing by the numbers suspension geometry programs have beenused for 20 years by racing teams around the world. It can be varied simply by raising or lowering the roll centre relative to the ground. Apr 19, 2005 here are the software programs that are most appropriatefor the circle track racer. James balkwill, in performance vehicle dynamics, 2018. The dirt car rear geometry layouts are varied and usually highly adjustable for both late models and modifieds. For windows 7, 8 and 10 with opengl see the faq for more details faq for more details. 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. Jul 23, 2017 smitty describes the principles of suspension design. This might be acceptable for a purpose built race car using spherical links everywhere, but for a road car using a lot of rubber components, it does cause some problems. Suspension travel and spring stiffness, are totally interdependent.
The suspension analyzer does a complete 3d suspension analysis, including bump steer, ackerman, caster gain, anti dive, tire scrub, camber gain and much more. There are 10 key factors to be considered when designing a suspension system, whether its for a single seater or sports prototype, and part of the skill of the designer lies in reconciling the conflicts between them. Comes with a complete instruction and documentation work book. Not have sufficient suspension travel or free movement suspension must have no binding. Software for suspension design automotive suspension. Stop guessing and start winning learn the facts of rear suspension geometry with this informative cdrom computer software. Camber matters optimizing track performance for strut.
Links may be made to the site, but the product may not be redistributed in any way other than by direct download from. I used an older version of this software to design my formula sae cars suspension. Computerized chassis setup racing software technology. For windows 7, 8 and 10 with opengl see the faq for more details faq for more. If you want to use this calculator ad free, enable unlimited private models, enable. Finding your center finding your front and rear roll center. And dont forget about engine analyzer our engine design software to help. For the amateur car designer, there are many tools available today that make designing a car easier. The classic version of the suspension geometry calculator. Lower lateral link, upper reversed aarm, twin trailing links rear a variation on the above. You adjust camber and tire pressures using tire temperatures. To help with this process, multiple programs and methods will be used. Suspension geometry characteristics of a live axle are as follows 1. Complete graphs and reports are included, and several new.
Front and rear suspension analysis simulation software program. The most complete racing car chassis setup tutorial guide available presented by shown above is a gaming expo fair in europe that held a contest for the best gamer team in a newly released 1st shooter game competition. It offers all the features of programs like solidworks, but is completely free of charge. Drawing templates, 3d cad, fea, cfd, suspension geometry download now. The trailing arm angles affect the rear steer and bite and the pull bar, or lift arm, can redistribute load upon acceleration and deceleration. Steve brown, steve brown race cars, amston connecticut i have been playing with the 4link wizard a little bit, and am very impressed.
You cant calculate the suspension geometry from this info the loads will determine the area thickness cross section of the suspension arms necessary to carry the loads but suspenion geometry will always be chosen by the designer as the best compromise between tyre movement path of the tyre centre, camber change, bump steer if present. Full vehicle version also includes push rod and pull rod springs for double a arm suspension. As before, this produces greatly increased jacking, and most designers would find this too disadvantageous. Scrub radius should be minimised inner 90% of tyre contact patch camber gain 1 per 25mm of travel. At some point you will want to enter your own suspension geometry data or.
Smitty describes the principles of suspension design. Our weight transfer worksheet is explained in detail. The classis 60s sports and racing car rear suspension. Antipitch is the name given to a suspension geometry, front and rear that prevents pitch under braking. If you want to use this calculator ad free, enable unlimited private models. Stop guessing and start winning learn the facts of front suspension geometry with this informative cdrom computer software. 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.
Race car suspension setup faster lap times through better suspension tuning and development see our new web site on suspension set up. This is the fifth in the video series developed for ucis racecar engineering program. 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 roll center calculator lets you input, view, save, analyze and compare either double a frame or mcpherson strut front suspension geometry. Suspension geometry an overview sciencedirect topics. What is the best free cad software for racecar engineering. Some software includes kinematic capabilities that simulate vehicle dynamics using the designed suspension. Analyzing chassis geometry has been a very time consuming effort. Drawing templates, 3d cad, fea, cfd, suspension geometry. Allows steer, roll and bump or rebound suspension movements. Computesreports all critical front suspension factors like moment arm length and shockspring travel.
You may want to to concentrate on one side of the vehicle or viewedit the travel. Understanding your cars suspension geometry haynes. Employing research and designs from previous years cars, the suspension will be designed using the iterative design process. Upper lateral link, lower parallel links, twin trailing link rear a variation of the reversed lower aarm style. The suspension setup for a strutequipped car is very much like that of a double wishbone aarm suspension. As well as creating a 3d cad model autodesk inventor prof 2012 of my chassis design i am looking to create a simulation of the suspension geometry and if possible calculate the geometry values. From creating an accurate model of the car and every nut and bolt in it in 3d, to the design and simulation of critical aspects such as the chassis and suspension, software programs have become commonplace to amateur car design. If one wheel moves over a hump or dip in the road then the axle will tilt causing both wheels to become cambered.
Typical rear suspension screen, here analyzing an angled 4 link rear suspension and driveshaft movement and u joint angles. In order to understand the complexity of a formula cars suspension, a basic knowledge of the stock car suspension should first be mastered. The latest program,wingeo3, is available for the windows operating system. We have the ability to gather the geometry from your car and do a complete analysis or perform analysis of a local area such as a wing or suspension system. Wheel camber is zero irrespective if the vehicle is stationary or moving round a bend in the road. Suspension tuning can be used to change the way the car behave on different track and road conditions, playing to your car. The suspension calculator aims to help people who are building race cars perform suspension related calculations. Racewise rwfront front suspension geometry software. The ultimate racing car chassis setup guide and tutorial. Pdf 20020346 development of a new software for racecar.
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