Energy absorbing bumpers pdf file

In most cases, no damage to the struck vehicle meant the collision magnitude was small enough to fall within the performance standards of a 2. The incidence of vehicle damage at tnese speeds would dewen. On cars and light trucks, the bumper is the primary energyabsorbing structure. The impact absorbing core, protective cover and hidden hardware allow the bumpersign to take an impact and make an impact. The fem results indicated that the performance of bionic bumpers was better than that of a normal bumper with regard to bending strength, energy absorption, and being lightweight. Design and analysis of automotive bumper using composite. Gn 454 vibration shock absorption mounts, with stainless.

Us2997325a us840201a us84020159a us2997325a us 2997325 a us2997325 a us 2997325a us 840201 a us840201 a us 840201a us 84020159 a us84020159 a us 84020159a us 2997325 a us2997325 a us 2997325a authority us united states prior art keywords impact plastic material piston kinetic energy absorbing prior art date 19590915. Stiffness and energy absorption are essential criterion. When vehicles were designed with energy absorbing pistons, calculations could be made concerning the collision energy by measuring the compression of the pistons. Practical examples of shock absorbing components include bumpers, isolators, fasteners, mounts, spacers and pads.

A bumper is a structure attached to or integrated with the front and rear ends of a motor vehicle. The proposed design for an energy absorbing bumper for a car fig. The proposed design for an energyabsorbing bumper for a car fig. Automotive bumper beam is one of the key system in car. All in all, fun as a classic but not as a daily driver. An alternative to this option is for a secondary structure to have a lower edge no higher than the bottom of.

Energy absorption during an impact is very important in automotive bumper system. The length limitations described in this subsection a1 shall be exclusive of energyabsorbing bumpers and rear view mirrors. Keyword energy absorption, composite material, automotive, bumper beam, fea introduction the main function of a bumper system is to protect the car body and passengers during impact collision. Design and analsis of car bumper by varying materials and speeds.

In this case the energy to be absorbed is the incoming kinetic energy plus the additional work done by the weight, w, acting through the beam deformation. If a crash does occur, the zone body, srs airbag systems and. The energy balance approach is easy to extend to impact on a beam by a dropped mass. For energy absorbing structure, the higher the sea the better energy absorption capability. Design and analsis of car bumper by varying materials and. An energyabsorbing car bumper has a spring stiffness constant of 550 knm find the maximum compression of the bumper if the car, with mass 0 kg, collides with a wall at a speed of 2.

Bumpers beam design to prevent or reduce physical damage to front or rear end. Materials in automotive application, state of the art and prospects 367 x higher levels of equipment, trim and soundproofing. The study is motivated by the growing use of thermoplastic materials in bumper applications requiring new design concepts and fabrication procedures. Numerous developments, improvements in materials and technologies, as well. A bumper system mainly consists of 3 components, namely fascia, bumper beam and mounting brackets. Excludes energy absorbing front and rear bumpers up to one foot in front and rear. One of the requirement options is for the light trucks primary frontal energy absorbing structure to geometrically overlap at least 50 percent of the zone established by nhtsa in its bumper standard 49 cfr part 581 for passenger cars. A study of automotive energy absorbing bumpers 730024 this paper presents an analysis of various energy absorbing units for automotive bumper applications. The impactabsorbing core, protective cover and hidden hardware allow the bumpersign to take an impact and make an impact. An energy absorbing car bumper has a spring stiffness constant of 550 knm. The bumper beam is the main structure for absorbing the energy of collisions. They can be mounted on the damping side with din 912 socket head cap screws. If a crash does occur, the zone body, srs airbag systems and other measures help mitigate injury. Compare models, specs and pricing across 2020 nv cargo van models, including the nv1500, nv2500, and nv3500.

The bumpersign by mccue is an impact absorbing signpost that can take a hit and return to an upright position. Analysis of crash impact of composites stayshaped bumper. An energyabsorbing car bumper has a spring stiffness constant of 550 knm. That is, a passive friction damper system could be used. Recognizing the need for a barrier that would smoothly redirect impacting vehicles while containing even large vehicles, the fhwa design ed a system composed of a 5 ft. Bumper beams are also the backbone of the energy absorbing systems. Claveau motor car bumpers 2 sheetssheet 1 filed march 31, 1952 april 8, 1958 e. Shock and energyabsorbing components are often used as a safety measure to dissipate runaway energy in case of a component or system failure. Automobile bumper subsystem is the front and rear structure of the vehicle that. But these metal bumpers slowly vanished for the many reasons one being heavy weight. The researchers envision using their novel energy absorbing materials in many applications, including shoe and helmet inserts, protective materials for. Feb 05, 2010 an energy absorbing car bumper has a spring stiffness constant of 550 knm find the maximum compression of the bumper if the car, with mass 0 kg, collides with a wall at a speed of 2. A bumper is a structure attached to or integrated with the front and rear ends of a motor vehicle, to absorb impact in a minor collision, ideally minimizing repair costs. Crash load efficiency cle is another indicator in relation to energy absorption capacity, and it is given as.

In an energy absorbing bumper assembly adapted to shield a structure against impact damage, said bumper assembly including an arcuate elastomeric member secured to said structure and having a convex outer surface and a concave inner surface, said elastomeric member and said structure cooperating to define therebetween a cavity, the improvement comprising. Columnmounted switch that controls turn signals, high and iow headlight beams. In the past, only metal bumpers were used to mitigate the crash. In general, bumper energy absorbers are designed to absorb minor collision energy by crushing or collapsing, thus reducing physical damage to the vehicle structure. February 24, 2015 the dow chemical company page 3 of 6 large release due to the solid nature of impaxx energy absorbing foams, releases are. Will the light truck bumper heightmatching standard reduce. The length limitations described in this subsection a1 shall be exclusive of energy absorbing bumpers and rear view mirrors. Base toyota venza excluding powertrain lotus engineering design 2020 venza 2017 venza system weight kg % mass. Materials in automotive application, state of the art and. The journal of the virginia state bar real property section. An energyabsorbing car bumper has a spring stiffness constant o. Bumpers are structural components installed to reduce physical damage to the front and rear ends of a light heavy motor vehicle from lowspeed collisions. Choice of leather or cloth and leather seat inserts. The front car bumper system is a complex energyabsorbing system in a car design 1 which must meet both the requirements of pedestrian.

Product safety assessment impaxx energy absorbing foam. It also introduces several general criteria concerning their design and performance to provide an analytical outline of the parameters involved. Liquidfilled or other energy absorbing bumpers on a bus or motor home rv are excluded from the measure, hta s10911. Rmermv bumper selection chart rme rmv the bumpers are designed to compress down to 25% of their free length. Stiff metal bumpers appeared on automobiles as early as 1904 that had a mainly ornamental function. The function of automotive bumpers has changed considerably over the past 70 years. Impact condition 32, cross section 38, 39, rib 38, thickness 40, material 41, 42, 43, and shape 44 also are significant factors that affecting the energy absorption. Energyabsorbing steering column energyabsorbing instrument panel energyabsorbing torque box perimeter frame energyabsorbing front and rear bumpers interior luxury and, inside, softly contoured, deepcushioned splitbench seats with pulldown separate armrests offer the comfort and convenience of preferred individual seating. These are the common factors that affecting the energy absorption found in literature. Pleiger plastics can design and test shock absorbing bumpers to develop stress and strain curves which meet specific needs for bump stops, damping bumpers and bumper systems.

Shock absorbing applications are both common and highly variable, since they can include prosthetics, coal car draft gears and pump check valve balls. That is, a passive friction damper system could be used to attenuate more road vehicle impact energy in collisions. Energy absorbing steering column energy absorbing instrument panel energy absorbing torque box perimeter frame energy absorbing front and rear bumpers interior luxury and, inside, softly contoured, deepcushioned splitbench seats with pulldown separate armrests offer the comfort and convenience of preferred individual seating. There is generally a gap of 70mm to 100mm between the fascia and the bumper beam which can be utilized towards improvement in safety, by inserting an energy absorbing component. The overall shape modeling for the rcar 3d simulation is shown in fig. Highway safety and vehicle extricatio n ronald gagne. The bumper should support the mechanical components and the body. Required safety devices may not extend more than 10 beyond permissible vehicle length or combination length. A large amount of this material is not expected to be hazardous to the environment or surrounding community. Bumper beam is one of the main parts in bumper system which is used as protection for passengers and frontal. An energy absorbing bumper system made of a foam type resin of polypropylene, polyurethane or the like is one concept koji enomoto, 1988. Alternatively, a selfr3setting hydraulic energy absorber could be enployed. The load path from the crash results in energy that does not initially strike the intended engineered crush structure of the passenger vehicle.

Researchers create engineered energy absorbing material. The energy absorption of a rubber bumper is limited due to the compression limits of the material. Find the maximum compression of the bumper if the car, with mass 1500 kg, collides with a wall at a speed of 2. Pdf design of a conceptual bumper energy absorber coupling. A common cause of damage to any mechanical device is the g level it experiences. Pdf the car front bumper system needs to meet the requirements of both pedestrian safety and lowspeed impact which are somewhat. A study of automotive energyabsorbing bumpers 730024 this paper presents an analysis of various energyabsorbing units for automotive bumper applications. At this maximum compression, the outside diameter increases by 40%. Pdf bionic design of the bumper beam inspired by the. At romeo rim, we have been providing high quality reaction injection molded parts to our customers for over 30 years.

February 24, 2015 the dow chemical company page 3 of 6 large release due to the solid nature of impaxx energy absorbing foams, releases are unlikely. Bumpers are not capable of reducing injury to vehicle occupants in highspeed impacts, but are. Gn 454 vibration shock absorption mounts, also known as shock absorbing mounts, vibration mounts, antivibration mounts, vibration bobbins or rubber bumpers, are frequently used as endstop bumpers, e. This work dealt with design and development of energy absorbing.

The following documents are considered part of this procedure by reference. Bumper energy absorbers are typically designed for onetime use and must be replaced if damaged. Bumper front energynon energy absorbing since 1976, terrys jaguar has been in the business of supplying a wide range of parts for jaguars everything from xk120, xk140, xk150 and all xke etype parts models right through to the latest jaguars on the road. A shock absorbing material is introduced in the design to transfer the energy from the impact from the surface or chassis directly into the material so the internal components are not damaged. Helps minimize the damage when a collision is unavoidable. An energyabsorbing car bumper has a spring stiffness. This versatile sign can mark anything from accessible parking to curbside pickup and will carry your brand from the store to the parking lot. Design of a conceptual bumper energy absorber coupling. Energy absorbing bumpers and crumple zones, all designed to keep the passenger compartment intact, become irrelevant. It can be concluded that the effectiveness of automobile bumpers to withstand impact of vehicles by absorbing the kinetic energy from the impact can be improved with the use of a passive friction damper. Although a vehicles bumper systems are designed to absorb the energy of lowspeed collisions and help protect the cars safety and. The bumpers shall have sufficient energy absorbing capacity to stop the crane when traveling at a speed of at least 40 percent of rated load speed.

Manufacturers of light trucks could meet this standard by having the light truck bumper match car bumpers known as option 1, or by installing a secondary energyabsorbing structure below the light truck bumper to match car bumpers known as option 2. The later performance is achieved by a combination of careful design, material selection to obtain a particular balance of stiffness, strength and energy absorption. Claveau motor car bumpers 2 sheetssheet 2 filed march 31, 1952 yven7 0r amau united states patent 2,829,915 motor car bunipers emile claveau, paris, france application march 31, 1952, serial no. Bumper energy absorbers, crush boxes, and bumper reinforcements. Energy absorber is a component in the bumper system placed in between bumper fascia and bumper beam. Design of shock absorber for car front bumper by international. Experimental evaluation of the attenuation effect of a. The objective of this work is to design and develop a shock absorbing bumper for m1 category of vehicle. Our awardwinning molding machinery has produced everything from spas to farm machinery to our revolutionary low weight, high energy absorbing help bumpers. Many energy absorbing bumper systems have been proposed to meet the challenges faced by the bumper designer. Pdf energy absorption during an impact is very important in automotive bumper system. Energyabsorption vehicle bumpers should absorb low speed crash energy without damage to other parts of the vehicle. The drum brakes require substantially longer stopping distances, and the body roll from the cutlasss 17foot length, small tires, and wheel locations make it feel unstable.