Newer commercial software has kinematic features built in that simulate road conditions, or will calculate pickup points based on. Calculate and compare the geometry setup of 5 motorcycles. The loads and geometry are then used to design the arms and spindle. The last option, and most commonly used, is a link controlled beam axle suspension design such as the one shown in figure 1 typical rock. The chassis always returns to the static position when releasing the mouse. My attitude to suspension geometry is pragmatic, and, in the absence of the requisite tools, fairly untrammelled by science. Aftermarket manufacturers make kits that retrofit an existing radius arm suspension to a parallel fourlink design and use coil springs and a track bar to center the axle. The finite element analysis of various suspension components are done in commercial software ansys 14. Front suspension geometry pro incredible, amazing and astonishing, you have to see it to believe it. Department of mechanical engineering, union college advisor. Suspension properties are not only linked to each other, the geometry and the shock damper, but also to the position of the bike in its travel. The suspension geometry, the stiffness of the bushings connecting different components of the system, the flexibility and the mass distribution of brackets and other suspension components are very important factors for the dynamic behaviour of this system and its capability to filter or amplify the vibrations coming from the wheels to the vehicle body. What is best software for designing suspension systems.
A variation on the radius arm suspension is the parallel fourlink, shown in the figure above. The basics of suspension geometry, as well as a diagonally identical wheelbase, spring rates, and wheel offset, must be adhered to if you want your car to handle well. Useful programs may be made inhouse requiring almost zero computational resources. One common trick, to make the calculations easier, is to assume that the. Having owned both cars and verifying that the s3 suspension design is essentially identical to current caterham. May 30, 2016 the geometry of chassis design and suspension movement dictate the handling characteristics of a car.
Design of the geometry of double wishbone suspension system along with design of spring plays a very important role in maintaining the stability of the vehicle. Newer commercial software has kinematic features built in that simulate road conditions, or will calculate pickup points based on your ideal suspension parameters essentially reverse engineering your suspension geometry needs. Rear suspension geometry this is a software package that addressesthreelink suspensions and late model fourlink floaterstyle. Easily and effectively create vehicle suspension designs, that can be used to help make design decisions at the initial concept stage up to and including det. Smitty describes the principles of suspension design. Software for suspension design automotive suspension. Few are following 1 solid worksfor static design, can calculate the dimension of members a. The options for entering your geometry specs include. Computer program for 3d double aarm wishbone suspension analysis. Design, analysis and fabrication of rear suspension system. Suspension geometry characteristics of a live axle are. Davis, benjamin design of three and four link suspensions for off road motorsports.
For windows 7, 8 and 10 with opengl see the faq for more details faq for more details. The classis 60s sports and racing car rear suspension. Some suspension design software packages provide 3d visualization of suspension geometry and movement, and enable the designer to change pickup points and other points in space before reanalyzing the design. Easy and effective virtual prototyping of vehicle suspensions. Aftermarket components like yokes and linkages can be measured and input by the user.
This means that the software is easy to use with a practical. 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. 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. Susprog3d is the premier kinematic suspension design and analysis tool.
Upper lateral link, lower parallel links, twin trailing link rear a variation of the reversed lower aarm style. Front and rear suspension analysis simulation software program. Both versions of the software provide the same features. All chassis dimensions and specifications are editable. It is the prime source for the book motorcycle handling and chassis design by tony foale and software packages for motorcycle suspension setup and analysis. 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. 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.
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. Because internet explorers maximum url length is shorter than other browsers, your project cannot be saved properly in this browser. The modern era in suspension design was initiated when yamaha announced their cantilever system, and employed just one suspension unit monoshock. Motorcycle setup software the modern era in suspension design was initiated when yamaha announced their cantilever system, and employed just one suspension unit monoshock. Motospec has been designed for racing use, with a simple interface and clear outputs, to assist motorcycle tuners and race teams make quick and knowledgeable decisions. In essence the vehicle model containing the concept suspension can be used to investigate the suspension design.
Free tools and software for race car, sports car and offroad vehicle design. Articles and illustrations on motorcycles and racing in general. Jul, 2009 easily and effectively create vehicle suspension designs, that can be used to help make design decisions at the initial concept stage up to and including detailed analysis of the complete vehicle. Take a look at performance trends calculators here. New website design to incorporate the r ace server. 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 figure 4, 5, 6 shows the suspension geometry in lotus suspension analysis software.
Aug 29, 2007 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. Design of three and four link suspensions for off road use benjamin davis union college schenectady, ny. Wheel camber is zero irrespective if the vehicle is stationary or moving round a bend in the road. Or, maybe you are looking for a little more forward bite. 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. Suspension geometry characteristics of a live axle are as follows 1.
David hodgson this thesis outlines the process of designing a three link front, and four link rear suspension system. This approach is now well established and will be discussed further in the next section of this chapter. Lower lateral link, upper reversed aarm, twin trailing links rear a variation on the above. Double wishbone suspension system it is popular as front suspension mostly used in rear wheel drive vehicles.
Basic suspension geometry lessons rod and custom magazine. 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. Spec is software for tuning motorcycle suspension and chassis geometry. For windows 7, 8 and 10 with opengl see the faq for more details faq for more. How your bikes suspension design affects its performance. Design, analysis and optimization of suspension system for an. It includes graphs and suggestions for changes to your geometry. Introducing optimumkinematics, software that makes computeraided suspension design and analysis fast and convenient. Car design tools for chassis, suspension, aerodynamics. Autoware autoware inc front suspension geometry software. Drawing templates, 3d cad, fea, cfd, suspension geometry. Performance trends offers a few different options, including a free trial.
Suspension by design susprog3d is the premier kinematic suspension design and analysis tool for windows 7, 8 and 10 with opengl see the faq for more details. As a base point, in order to calculate the standard suspension geometry accurately, i used chris gibb. To get a first look at what r ace can do, check out the tuning series in the suspension design library. Rear suspension geometry is your car loose and cross weight nor springs will fix the problem. Supact motorcycle geometry software is developed in a racing environment. This is the fifth in the video series developed for ucis racecar engineering program. A market leading application for suspension modelling and design from the. The upper arm is usually shorter to induce negative. The calculations vary from motion ratios, to spring stiffness, to wheel loads.
The classic version of the suspension geometry calculator. The 4link calculator lets you input, view, save, analyze and compare your 4link rear suspension geometry. With this calculator you will see how bump and droop can affect camber. Racewise provides the technical understanding of suspension and tire performance that racers must have in order to make no guesswork decisions. If one wheel moves over a hump or dip in the road then the axle will tilt causing both wheels to become cambered. The roll center calculator lets you input, view, save, analyze and compare either double a frame or mcpherson strut front suspension geometry. Initially the yamaha version was designed for motocross to extend wheel movement, and this led to a wide variety of alternative rear suspension systems by. For windows 7, 8 and 10 with opengl see the faq for more. Nov 08, 2018 the classic version of the suspension geometry calculator. Jul 23, 2017 smitty describes the principles of suspension design. Dsp suspension design software for automobile springs and. Oct 01, 2007 the basics of suspension geometry, as well as a diagonally identical wheelbase, spring rates, and wheel offset, must be adhered to if you want your car to handle well. Front view suspension geometry calculatorsimulator.
Initially the yamaha version was designed for motocross to extend wheel movement, and this led to a wide variety of alternative rear suspension systems by several manufacturers. Discusses the use of computers in suspension geometry analysis, with programming techniques and examples of suspension solution, including advanced discussion of threedimensional computational geometry applied to suspension design. The geometry of chassis design and suspension movement dictate the handling characteristics of a car. The geometry of the suspension has been modelled in commercial software package lotus shark.
Racewise rwfront front suspension geometry software. The full installation zipped folder is a zipped folder, which has to be unzipped and installed. Inevitably some problems will be found in the course of this that force compromises to be made with the basic geometry of the suspension. Motochassis is for those interested in motorcycle handling and chassis. Analyze parameters that effect steering and handling of the motorcycle. Real suspension design packages are too expensive for normal people to buy. Now you can get all the racewise chassis school material in an easytouse software program for your home computer. It is simplicity itself and a great place to start learning about suspension geometry.
Some software includes kinematic capabilities that simulate vehicle dynamics using the designed suspension. Vsusp no longer supports any version of internet explorer. Suspension geometry an overview sciencedirect topics. 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. Oct 06, 2014 during the detailed design, analytical tools are available to the designer. Suspension geometry part 2 roll center, double wishbone, macpherson strut duration. As such, it appears on your registry and it is accessed via the start menu. Apr 19, 2005 it includes graphs and suggestions for changes to your geometry. Lotus engineering suspension analysis lsa, the commercial version of software from lotus engineering in the u. There are a number of software to design a suspension system. Easily and effectively create vehicle suspension designs, that can be used to help make design decisions at the initial concept stage up to and including detailed analysis of the complete vehicle. Often loads that have been measured on a similar suspension are used instead this is the most reliable method. Motorcycle setup software motochassis by tony foale. 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.
How your bikes suspension design affects its performance on. Rear suspension geometry this is a software package that addressesthree. Development continues but under a new name, smbs is now r ace rapid concept evolution nov 2018. Spec is software for tuning motorcycle suspension and chassis geometry motospec has been designed for racing use, with a simple interface and clear outputs, to assist motorcycle tuners and race teams make quick and knowledgeable decisions. Im doing a chassis design project for my major project in my degree 2nd year. These systems are commonly found on vehicles used for the sport of rock. Design of three and four link suspensions for off road use. Its not that i believe suspension geometry is irrelevant far from it, i think its very important but design is about best use of available resources, whether money, time, material, manufacturing techniques. The suspension calculator aims to help people who are building race cars perform suspension related calculations.
This suspension design software lets you take into account various characteristics of your car, such as corner weights, the suspension type, the suspension geometry, wheel widths and offsets, and wheelbase to intelligently select springs coil, leaf, and torsion bar springs and sway bars also called swaybars, antisway bars, or antiroll bars. First, lets start by looking at the suspension movement and the tools available to make your life easier. In this article well cover what we consider to be the three most important elements. 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. You can get a long way without knowing specific tire data, and design a suspension that wont screw ya, and is going to be tunable enough to get.
At work i use adams, and dread to think what the license rates. Explains in detail the direct and iterative solutions of suspension geometry. Software for designing and analyzing suspension systems and geometry. Development continues but under a new name, smbs is now r ace rapid concept evolution. This can be used to determine suspension geometry and stiffness.
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