It offers all the features of programs like solidworks, but is completely free of charge. With this calculator you will see how bump and droop can affect camber. 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. No part of the program or code shall be reproduced for commercial use. Design and optimization of formula sae suspension system. So a ride height adjustment to your race car, or a roll centre geometry change is a very valid tuning device.
It is simplicity itself and a great place to start learning about suspension geometry. Software for auto racing and high performance cars. The classis 60s sports and racing car rear 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. For windows 7, 8 and 10 with opengl see the faq for more details faq for more. 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. The calculations vary from motion ratios, to spring stiffness, to wheel loads. You may want to to concentrate on one side of the vehicle or viewedit the travel.
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. Not have sufficient suspension travel or free movement suspension must have no binding. 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. Tune to win is similar to chassis engineering in scope but probably more indpth. Im doing a chassis design project for my major project in my degree 2nd year. 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. At some point you will want to enter your own suspension geometry data or even just just view the current model in more detail.
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. Employing research and designs from previous years cars, the suspension will be designed using the iterative design process. Susprog3d is the premier kinematic suspension design and analysis tool. Elmer is a free open source multiphysical simulation software. The roll center calculator plus is just the front suspension screen, rear suspension screen, and the transition handling screen of the circle track analyzer. Each car needs to be evaluated for where it is to be raced and then set correctly. Autoware autoware inc front suspension geometry software. The dirt car rear geometry layouts are varied and usually highly adjustable for both late models and modifieds. To help with this process, multiple programs and methods will be used. Links may be made to the site, but the product may not be redistributed in any way other than by direct download from. In this article well cover what we consider to be the three most important elements. First, lets start by looking at the suspension movement and the tools available to make your life easier.
Analyzing chassis geometry has been a very time consuming effort. Racewise rwfront front suspension geometry software. If you purchase a new race car, or a car from another race team, the car will not be set up. Now you can get all the racewise chassis school material in an easytouse software program for your home computer. 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.
If you want to use this calculator ad free, enable unlimited private models. 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. Mitchell, with help from carroll smith, created the first to my knowledge suspension geometry analysis software program call racing by the numbers. The options for entering your geometry specs include. Computerized chassis setup racing software technology. All types of tech info on racecar engines, chassis and suspension setup for road. When designing a front suspension, geometry layout is critical. Upper lateral link, lower parallel links, twin trailing link rear a variation of the reversed lower aarm style. Your software has eliminated that tiresome, mistakeprone task. The roll center calculator lets you input, view, save, analyze and compare either double a frame or mcpherson strut front suspension geometry. Free tools and software for race car, sports car and offroad vehicle design. Camber matters optimizing track performance for strut. We have developed the procedures needed to work out a set up for your race or performance car. Antipitch is the name given to a suspension geometry, front and rear that prevents pitch under braking.
Suspension geometry an overview sciencedirect topics. Steve brown, steve brown race cars, amston connecticut i have been playing with the 4link wizard a little bit, and am very impressed. If you want to use this calculator ad free, enable unlimited private models, enable. 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. 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. Mitchells racing by the numbers suspension geometry programs have beenused for 20 years by racing teams around the world. James balkwill, in performance vehicle dynamics, 2018. Car design tools for chassis, suspension, aerodynamics. As before, this produces greatly increased jacking, and most designers would find this too disadvantageous. 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. 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. Suspension travel and spring stiffness, are totally interdependent.
The suspension setup for a strutequipped car is very much like that of a double wishbone aarm suspension. Suspension tuning can be used to change the way the car behave on different track and road conditions, playing to your car. Software for suspension analysis automotive suspension. 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. 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. Race car suspension setup smithees race car technologies. The classic version of the suspension geometry calculator. Or, maybe you are looking for a little more forward bite. Race car suspension setup faster lap times through better suspension tuning and development see our new web site on suspension set up. Jul 23, 2017 smitty describes the principles of suspension design. Oct 06, 2014 race car design is one of the most fascinating and yet one of the most complex aspects of the racing world. 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. Rear suspension geometry is your car loose and cross weight nor springs will fix the problem.
Wheel camber is zero irrespective if the vehicle is stationary or moving round a bend in the road. Computesreports all critical front suspension factors like moment arm length and shockspring travel. The design teams in the many motorsport categories are constantly developing new solutions with one single goal in mind. Full vehicle version also includes push rod and pull rod springs for double a arm suspension. 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. Easily and effectively create vehicle suspension designs, that can be used to help make design decisions at the initial concept stage up to and. You can get a long way without knowing specific tire data, and design a suspension that wont screw ya. Easy and effective virtual prototyping of vehicle suspensions.
Stop guessing and start winning learn the facts of front suspension geometry with this informative cdrom computer software. Finding your center finding your front and rear roll center. 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. Drawing templates, 3d cad, fea, cfd, suspension geometry. Suspension geometry characteristics of a live axle are as follows 1.
What is the best free cad software for racecar engineering. 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. Front suspension geometry pro incredible, amazing and astonishing, you have to see it to believe it. The suspension calculator aims to help people who are building race cars perform suspension related calculations. 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. Useful for any racing vehicle weighing 1800 4000 pounds stock car, late model, sportsman, truck, sprint, modified, hobby stock, etc. 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. In order to understand the complexity of a formula cars suspension, a basic knowledge of the stock car suspension should first be mastered. For the amateur car designer, there are many tools available today that make designing a car easier. How to build a racing car follows the design and construction of the fvt05, a car built for the australian formula vee racing series.
The ultimate racing car chassis setup guide and tutorial. Front and rear suspension analysis simulation software program. 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. Allows steer, roll and bump or rebound suspension movements. 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. Links may be made to the site, but the product may not be redistributed in any way other than by direct download. Lister storm lmp designer reveals his trade secrets for suspension design. Universal suspension geometry software race wise by afco. Theres an art to setting suspension up, and without it your car will drive horribly. Afco rwfront suspension geometry software race wise. But my advice is to use a specific software for suspension design and simulation. The top arm should be approx 23 the length of the bottom arm. This involves placing the force application points g and h on the centre of gravity.
Our weight transfer worksheet is explained in detail. You adjust camber and tire pressures using tire temperatures. Theres a reason for this, though its all a bit voodoo. Some software includes kinematic capabilities that simulate vehicle dynamics using the designed suspension. Typical rear suspension screen, here analyzing an angled 4 link rear suspension and driveshaft movement and u joint angles. 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. The roll center is located where this line crosses the vertical center line of the axle and is centered between the rear wheels. Very latest technical knowhow on suspension set up and testing for racing and performance road cars. Here are the software programs that are most appropriatefor the circle track racer. 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. I used an older version of this software to design my formula sae cars suspension. For windows 7, 8 and 10 with opengl see the faq for more details faq for more details. The majority of our work has been in the drag racing industry but simulation covers all racing industries in particular aerodynamic cfd work.
This is the fifth in the video series developed for ucis racecar engineering program. Lower lateral link, upper reversed aarm, twin trailing links rear a variation on the above. It can be varied simply by raising or lowering the roll centre relative to the ground. If one wheel moves over a hump or dip in the road then the axle will tilt causing both wheels to become cambered.
Pdf 20020346 development of a new software for racecar. Understanding your cars suspension geometry haynes. Software for suspension design automotive suspension. The latest program,wingeo3, is available for the windows operating system. See all 15 photos roll center calculatorthis is a simple twodimensional front suspension layout program. Software for designing and analyzing suspension systems and geometry. 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.
Apr 19, 2005 here are the software programs that are most appropriatefor the circle track racer. Smitty describes the principles of suspension design. The trailing arm angles affect the rear steer and bite and the pull bar, or lift arm, can redistribute load upon acceleration and deceleration. Complete graphs and reports are included, and several new. This program is provided free of charge for personal use in the assisting of suspension calculations. Drawing templates, 3d cad, fea, cfd, suspension geometry download now. 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. And dont forget about engine analyzer our engine design software to help.
The suspension analyzer does a complete 3d suspension analysis, including bump steer, ackerman, caster gain, anti dive, tire scrub, camber gain and much more. Id agree that if you were going to buy one book, the herb adams book would be it to start with. At some point you will want to enter your own suspension geometry data or. Stop guessing and start winning learn the facts of rear suspension geometry with this informative cdrom computer software. Scrub radius should be minimised inner 90% of tyre contact patch camber gain 1 per 25mm of travel.
1279 1118 960 52 1073 1342 1364 771 323 1101 1283 143 83 208 613 1513 258 716 824 482 44 999 42 974 198 10 1500 579 734 1093 871 881 737 1458 15 862 1299 1303 68 534