The design of a formula student front impact attenuator materials. Hence we have to carry out the drop test which brings out the real time load application scenario. This impact attenuator is manufactured using materials mentioned before. This paper is presenting the design and numerical simulation of impact event for the frontal safety structure of car body for the formula sae vehicle developed by. Design and fabrication of impact attenuator for formula sae car. P a g e 2 abstract wpis fsae racecar requires an impact attenuator that can protect the driver and frame when mounted on the front bulkhead of the vehicle.
This project deals with building of crashprotective device for an fsae. Analysis of a carbon fiber reinforced polymer impact attenuator for a formula sae vehicle using finite element analysis a thesis presented to the faculty of california polytechnic state university, san luis obispo in partial fulfillment of the requirements for the degree master of science in mechanical engineering by john thomas rappolt june 2015. Chassis and impact attenuator design for formula student race car. Pdf behaviour of an impact attenuator for formula sae car. The impact attenuator analyzed in such study was made of aluminum sandwich material with an honeycomb core separating two thin skins. The sole purpose of the project is to focus on a very important aspect of the vehicle which is the impact attenuator. Plascore crushlite is a lightweight aluminum honeycomb core material which is certified to specific crush strengths for energy absorption applications. Us5823584a vehicle mounted crash impact attenuator. All the vehicles need to be equipped with a safety device because for safety of the driver and passenger. As the major load acting on the vehicle is dynamic. The design of a formula student front impact attenuator. As per rules, mentioned in fsae rulebook for impact attenuator.
Jose firmino aguilar madeira examination committee chairperson. Dynamic analysis and design of impact attenuator structures. Design and development of impact attenuator for racecar safety. Mounting holes shown are for reference only attachment is up to the team to determine. Design and experimental validation of carbon fiber impact. The thickness of the aluminium sheet was 2 mm while the antiintrusion plate was consists of solid steel of 1. It achieves that by deforming plastically and absorbing a part of the total energy involved during a collision. Photos of the impact attenuator before and after impact must be provided to fsae prior to the competition for inspection.
Design and physical testing of impact attenuator for formula sae race car nikhil s. This project deals with building of crashprotective device for an fsae car. The second series consisted of eight vehicle tests colliding into an unfrozen inertial type impact attenuator system. It is tested to nchrp report 350 test level 1, test level 2, and test level 3. Aim of this paper is to provide innovation towards the usual and conventional honeycomb structured attenuators for fsae. Formula sae, impact attenuator, quasistatic testing. Fsae standard impact attenuator inches according to campbell, a composite material can be defined as a combination of two or more materials resulting in another material with better properties than individual components 4. The traffix devices big sandy is an impact attenuator sand barrel that is manufactured from uv stabilized high density polyethylene. A crash impact attenuator designed to be mounted on a service truck or other vehicle including a perimeter band, preferably with an elongated profile having generally arcuate ends spaced from each other and interconnected by opposing links of side walls. The lower shell was a cuboid with accommodated with sixteen beer cans.
Finite element model of a race car structure with impact attenuator 18. Design of a formula student impact attenuator tue 1. The purpose of this study is to get the impact attenuator design with the best ability to absorb kinetic. The analysis was performed based on computerized simulation software for calcu.
Design and fabrication of impact attenuator for formula. Dynamic analysis and design of impact attenuator structures for a formula student prototype andre miguel almeida santos thesis to obtain the master of science degree in mechanical engineering supervisors. Design and optimization of an fsae frame, suspension, and. It now requires minimum 8 bolts up from the minimum 4 from past years. The midway crushing of impact attenuator in shown in fig. The scorpion ii metro tma from traffix devices is the only tl2 plus 50 mph 80 kph tma that. The length of the system shall not be excessive to the extent that it intrudes appreciably within the clear offset distance as shown on the plans. The quadguard high speed is the only crash cushion attenuator to be tested using nchrp 350 criteria at 70mph 1kmh.
Section 650 impact attenuator units compression crash cushion page 3 the length of the system will be the combined length of the attenuator unit, the backup system and any required transition. Pdf design of the impact attenuator for a formula student racing. The big sandy sand barrel is mash tested, passed and eligible and meets the crash worthy requirements of nchrp 350. Wpis fsae racecar requires an impact attenuator that can protect the driver.
Fsae impact attenuator worcester polytechnic institute. Fsae standard impact attenuator inches according to campbell, a composite material can be. Design of the impact attenuator for a formula student racing car. Design of the impact attenuator for a formula student racing. The first series consisted of four vehicle tests using the guard rail energy absorption terminal great impact attenuator system configured at three different angles and positions. The fsae rules require the impact attenuator have minimum dimensions of 200 mm by 200.
This impact attenuator is designed for sae supra competition 2015 under the design criteria as per the rule book of sae supra 2015 listed as follows. Tl3 react 350 low maintenance impact attenuator cz or permanent traffix devices, inc. Ulm formula student impact attenuator testing 2012 duration. Let us show you how we can help you with our xtenuator ground attenuator.
Fsae impact attenuator manufactured from dow impaxx 700. The shell was designed in two stages in the shape of cuboids as described below. The quadguard high speed system is a redirective, nongating impact attenuator designed for high speed impacts and cushions at speeds up to 70 mph. Drop test analysis of impact attenuator for formula sae car.
Behaviour of an impact attenuator for formula sae car under dynamic loading article pdf available in international journal of vehicle structures and systems 22 july 2010 with 2,972 reads. Index terms drop test analysis, impact attenuator ia, formula sae, crash analysis i. The impact attenuator 7 is an energy absorbing device installed forward of the front bulkhead of the car with the function to absorb energy and to protect the driver from a sudden change of. Design of the impact attenuator for a formula student racing car 54 2. Seen above is the drawing for the standard impact attenuator speci ed by the 2017 rules. If there are any differences between this summary and the official rules, the rules will prevail. Section 650impact attenuator units compression crash cushion page 3 the length of the system will be the combined length of the attenuator unit, the backup system and any required transition.
Chassis and impact attenuator design for formula student racing car. Within a few seconds of time impact loads can cause serious damage to the vehicle. Fsae front impact attenuator unc charlotte youtube. The team is also required to show a schematic drawing of the test method. With impacts, however, if the collision distance is increased, the acceleration values will decrease. Introduction rom the past so many years, teams around the world had proposed many successful designs of impact attenuator using. Crash cushions impact attenuators energy absorption. See above, is the standard impact attenuator that will be used by the. Design and fabrication of impact attenuator for formula sae. Basic requirement for the efficient impact attenuator is it should absorb and release energy at a same time. Additionally the committee has decided to develop, test and release a standard attenuator design. As per rules, mentioned in fsae rulebook 2017 for impact attenuator. Design, manufacture and testing of an impact attenuator.
In this study, the method of analyzing the thinwall crashing box of impact attenuator for student formula is proposed by the means of simulation and validation following formula society of automotive engineerssae rules. The attenuators are designed for direct attachment to 24 in wide barriers and jerseyfshape barriers. Acceptable systems cannot be eliminated without documented justification as to why they should not be used. The impact attenuator test requirements have been revised. Through analysis of the car entered in the 2016 competition, research, feedback from the previous designers, and critiques from the competition judges, optimized designs were developed. An impact attenuator, also known as a crash cushion, crash attenuator, or cowboy cushion, is a device intended to reduce the damage to structures, vehicles, and motorists resulting from a motor vehicle collision. Formula sae standard impact attenuator fsaeia12 as per rule b3. Impact attenuators are designed to absorb the colliding vehicles kinetic energy.
Our road safety equipment company creates costeffective barriers and crash cushions for your needs. Design and development of impact attenuator for racecar. Impact attenuator nchrp 350 approved type i redirective. This impact attenuator has not changed since 20 and uses high energy absorbing foam. Ive read on the fsae forums that, if a team uses the standard impact attenuator, they dont need to send a data report.
The raptor system uses weatherresistant, energyabsorbing material surrounded by a uvstabilized polyethylene and can be installed at many sites that do not have the space needed for a traditional impact attenuator. Chapter 1620 impact attenuator systems wsdot design manual m 2201. Design and analysis of impact attenuator for student formula. Old type 1 beam guardrail design information wsdot is phasing out the use of type 1 guardrail. Impaxx 700 foam is a highly engineered, extruded, thermoplastic foam that utilizes dow proprietary process technology to maximize efficiency and minimize weight. Impact attenuator data iad and supporting calculations must be submitted electronically in adobe acrobat format. The impact attenuator data form, appendix b2, has been expanded to include a graph of your energy displacement curve, a plan of your attenuator and before and after photographs.
Tech data sheet impaxx 700 energy absorbing foam impaxx 700 energy absorbing foam is a higherperforming, and lowercost alternative to traditional energy absorbing solutions such as polyurethane and expanded polypropylene bead foams. Geometry of impact attenuator a twostage impact attenuator. The fsae rules require the impact attenuator have minimum dimensions of 150 mm by 200 mm by 100 mm or 5. Cost effective impact attenuator for a formula student car. Design and experimental analysis of an impact attenuator 59 and they act instantaneously. Geometric modelling to perform any type of worthwhile analysis, the design team decided the geometrical limits of the impact attenuator should be determined. As for the fsae rules, the impact attenuator must be numerical and experimental analysis of an impact attenuator in sandwich material for racing application s. Design, manufacture and testing of an impact attenuator for a. Overall dimensions of the attenuator taken were 210 x 210 x 100 mm3. Attenuators purchased from bsci will not include optional radii on edges or mounting holes. Updated 111911 fsae impact attenuator type 11 1 do not scale drawing sheet 1 of 1 wbr 31411 unless otherwise specified. Average deceleration of impact is less than 20 g as per the requirement of fsae design rules. This is mounted on front bulkhead of racecar as most intensive load develops in head on collision.
Crushlite yields at a constant force providing reliable and consistent energy absorption in almost any environment. The inspectors do not have this material and you may need it to answer questions about your vehicles design and construction. At substantially the center of the side walls, a loop of cable or similar high tension material is provided to limit any separation of the. The result shown that there was considerable deformation of impact attenuator. The impact attenuator is designed to absorb the vehicle kinetic energy in the form of even deformation and keeps the force level sufficiently low 2 3. Numerical simulation by using finite element methods and design of the impact attenuator of a formula student car body, is presented in this. During the technical inspection of the vehicle, the tested impact attenuator must be shown to the official and. Impaxx foam is a highly engineered, extruded, thermoplastic foam that utilizes dow proprietary process. According to fsae rulebook, attenuator should have specified minimum dimensions and mounting constraints. The impact attenuator 7 is an energy absorbing device installed forward of the front bulkhead of the car with the function to absorb energy and to protect the driver from a sudden change of momentum experienced during an event of a collision. Ulm formula student impact attenuator testing youtube. Also, wording such as or equivalent is not to be used when specifying these systems. Formula sae standard impact attenuator fsae ia12 as per rule b3. Tl3 compressor low maintenance impact attenuator type i redirective energy absorption systems, inc.
Impact attenuator standard ia type12 the 2012 type 12 attenautor is geometrically similar to the 2011 type 11 for 2012 attenuators purchased in either 2011 or 2012 may be used since they are identical there is a new requirement for 2012 that a diagonal tube must be included in the front bulkhead unless the size of the. An overview of design optimization of impact attenuator for. Geometry of the model this work is based on the analysis and improvement of the design of the impact attenuator and after on the design and improvement of the behavior of the links of the energy absorbing structure to the car body. The tl2 quadguard ii is 25% shorter than the original quadguard measuring less than 10 3 m and the tl3 model is 3 1 m. First, the stopping distance is calculated and then. Honeycomb has low density and high energy absorption capability. The prime intension is to present a design of impact attenuator which can be used in formula sae racecars. It can be utilized in permanent and work zone applications, or where.
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