Current Trends in Bumper Design for Pedestrian Impact

Worldwide, the pace of development in pedestrian countermeasures is increasing rapidly. To better understand the state of the art in bumper design for pedestrian impact, a survey of literature and patents has been performed. Two general approaches to reducing the severity of pedestrian lower limb impacts were identified: (a) Provide cushioning and support of the lower limb with a bumper and a new lower stiffener, or (b) Use the bumper as a platform for impact sensors and exterior airbags. This study focused on the first approach. Excluding bumper sensors, airbags, and nondesign-related articles, a total of 130 relevant technical articles and 147 patents were identified. The most common method proposed for cushioning the lower limb in an impact uses an energy absorber (plastic foam or ‘egg-crate’) in front of a semi-rigid (steel or aluminum) beam. There are also proposals for ‘springsteel’, steel-foam composites, crush-cans, and plastic beams. The most common method proposed for supporting the lower limb in an impact is a secondary lower beam, known as a ‘stiffener’ or ‘spoiler’. Most proposed lower stiffeners are plastic plates or metal beams supported by the engine undertray, the radiator support, or the front-end module. In addition to these concepts, there are a number of design proposals involving a deploying bumper or lower stiffener.

[1]  Pierre-Jean Cunat.  Stainless Steel In Structural Automotive Applications , 2002 .

[2]  Jackie D. Rehkopf.  Material Behavior for Modeling Bumper Impact , 2004 .

[3]  J. Harris.  Simplified test recommendations for pedestrian protection , 1985 .

[4]  N. D. Grew,et al.  The Influence of Car Design on Pedestrian Protection , 1985 .

[5]  Pádraig Naughton,et al.  An Approach To Front-End System Design for Pedestrian Safety , 2001 .

[6]  Hugo Mellander,et al.  Bumper system evaluation using an experimental pedestrian dummy , 1989 .

[7]  Young Woo Lee,et al.  Development of a vehicle structure with enhanced pedestrian safety , 2003 .

[8]  Seishiro Murata,et al.  Expanded Polypropylene (EPP) - A Global Solution for Pedestrian Safety Bumper Systems , 2004 .

[9]  Peter A. Weller.  An Integrated High Performance Bumper Concept Using Urethane , 1984 .

[10]  Ingo Kalliske,et al.  IMPROVEMENTS TO PEDESTRIAN PROTECTION AS EXEMPLIFIED ON A STANDARD-SIZED CAR , 2001 .

[11]  D J Segal,et al.  RESEARCH IN IMPACT PROTECTION FOR PEDESTRIANS AND CYCLISTS. FINAL REPORT , 1971 .

[12]  Stephen Shuler,et al.  ENGINEERING THERMOPLASTIC ENERGY ABSORBER SOLUTIONS FOR PEDESTRIAN IMPACT. IN: PEDESTRIAN SAFETY , 2002 .

[13]  L. Grösch,et al.  Bumper configurations for conflicting requirements: existing performance versus pedestrian protection , 1989 .

[14]  Frank G. Richardson.  Pedestrian protection and damageability and the Calspan research safety vehicle , 1980 .

[15]  G M Mackay,et al.  PEDESTRIAN LEG INJURIES, THE BUMPER AND OTHER FRONT STRUCTURES , 1977 .

[16]  J T Herridge,et al.  EXPERIMENTAL STUDY OF PEDESTRIAN INJURY MINIMIZATION THROUGH VEHICLE DESIGN , 1975 .

[17]  Guntram Dipl Ing Huber,et al.  Bumper for a vehicle , 1983 .

[18]  모리 고우지,et al.  Bumper absorber for pedestrian protection , 2003 .

[19]  김경환.  Dual bumper for protecting a walker , 2003 .

[20]  Akira Sasaki,et al.  CURRENT SITUATION OF PEDESTRIAN ACCIDENTS AND RESEARCH INTO PEDESTRIAN PROTECTION IN JAPAN , 1991 .

[21]  Jikuang Yang.  An Approach to Improve Vehicle-Front Design for Pedestrian Protection Using Mathematical Models , 2000 .

[22]  S. J. Ashton,et al.  Pedestrian Injuries and the Car Exterior , 1977 .

[23]  Mike Dickison.  Development of Passenger Cars to Minimise Pedestrian Injuries , 1996 .

[24]  Henry H. Wakeland.  Systematic automobile design for pedestrian injury prevention , 1961 .

[25]  达林·伊万斯.  Bumper with integrated energy absorber and beam , 2003 .

[26]  Howard B. Pritz.  Experimental Investigation of Pedestrian Injury Minimization Through Vehicle Design , 1977 .

[27]  Tohru Hashimura,et al.  Static and Dynamic Structural Performance of Extruded Aluminum Reinforcing Beams for Bumpers , 1993 .

[28]  A. Kuehnel,et al.  First step to a pedestrian safety car , 1978 .

[29]  Mcleanaj.  CAR SHAPE AND PEDESTRIAN INJURY , 1972 .

[30]  Magalie Menard,et al.  front end module for a motor vehicle , 2008 .

[31]  James Allen Crandall,et al.  Design of a New Bumper Beam Using Structural Thermoplastic Composite , 1993 .

[32]  Ltb Van Kampen.  EFFECTIVENESS AND COST OF CAR FRONT END DESIGN FOR PEDESTRIAN INJURY PREVENTION AND THE PROBLEM OF CONFLICTING REQUIREMENTS. A LITERATURE REVIEW , 1991 .

[33]  R. Weissner,et al.  Influence of bumper adjustment on the kinematics of an impacted pedestrian , 1978 .

[34]  S. O. Oyadiji,et al.  Preliminary investigations into the mechanical properties of a novel shock absorbing elastomeric composite , 2001 .

[35]  Steven R. Sopher.  Advanced Processing Techniques for Expanded Polypropylene Foam , 2003 .

[36]  Stephen Shuler,et al.  Bumper Systems Designed for Both Pedestrian Protection and FMVSS Requirements , 2003 .

[37]  A J Fisher,et al.  THE INFLUENCE OF CAR FRONTAL DESIGN ON PEDESTRIAN ACCIDENT TRAUMA, WITH DISCUSSION , 1971 .

[38]  I D Neilson.  TRENDS IN THE DESIGN OF CAR FRONT AND SIDE STRUCTURES TO MEET FUTURE SAFETY DEMANDS , 1984 .

[39]  光山 壮志,et al.  Shock absorbing structure for a vehicle , 1995 .

[40]  J Kajzer,et al.  Simulation of car impact to pedestrian lower extremity: influence of different car-front shapes and dummy parameters on test results. , 1994, Accident; analysis and prevention.

[41]  E B Weis,et al.  PEDESTRIAN IMPACT: BASELINE AND PRELIMINARY CONCEPTS EVALUATION. VOLUME II: TECHNICAL DISCUSSION , 1978 .

[42]  Janet Rawson.  Evaluation of a Solitary Front Bumper Design for a Midsize Vehicle , 1993 .

[43]  C. A. Hobbs,et al.  Psc1 - a Demonstration Car With Improvements for Pedestrian Protection , 1985 .

[44]  J Harris.  RESEARCH AND DEVELOPMENT TOWARDS IMPROVED PROTECTION FOR PEDESTRIANS STRUCK BY CARS , 1977 .

[45]  J Bonnoit,et al.  A NUMERICAL ANALYSIS OF THE CAR FRONT END MODULE REGARDING PEDESTRIAN LOWER LIMB SAFETY , 2000 .

[46]  Peter Schuster,et al.  Determination of Bumper Styling and Engineering Parameters to Reduce Pedestrian Leg Injuries , 1998 .

[47]  Christophe Bastien,et al.  Extendible safety device above a vehicle bumper , 2002 .

[48]  永井 重之,et al.  Bumper structure for a vehicle , 2006 .

[49]  Freerk Bosma,et al.  CLOSURE AND TRIM DESIGN FOR PEDESTRIAN IMPACT , 2001 .

[50]  Peter Niederer,et al.  Influence of Vehicle Front Geometry on Impacted Pedestrian Kinematics , 1984 .

[51]  Michael E. Carley,et al.  Advancements in Expanded Polypropylene Foam Energy Management for Bumper Systems , 2004 .

[52]  R. Hoefs,et al.  A bumper for both pedestrian and vehicle body protection: a contradiction in terms or a soluble conflict? , 1987 .

[53]  Robert Kaeser,et al.  DESIGN ASPECTS OF ENERGY ABSORPTION IN CAR PEDESTRIAN IMPACTS. IN: PEDESTRIAN SAFETY , 1983 .

[54]  William F Jessee.  Hit parade , 2002, BMJ : British Medical Journal.

[55]  Subhransu Mohapatra,et al.  Method for Designing and Evaluating Pedestrian Protection Energy Absorbers for Various Car Geometries , 2004 .

[56]  J. Harris,et al.  Practical vehicle design for pedestrian protection , 1982 .

[57]  Dinesh Mohan,et al.  Safer Truck Front Design for Pedestrian Impacts* , 1998 .

[58]  A J McLean.  Vehicle design for pedestrian protection , 2005 .

[59]  Susumu Kuroda,et al.  EVALUATION OF PEDESTRIAN PROTECTION STRUCTURES USING IMPACTORS AND FULL-SCALE DUMMY TESTS , 2003 .

[60]  Takeshi Kobayashi,et al.  Bumper structure for pedestrian protection , 1996 .

[61]  C G Gloxon.  Safer cars for pedestrians , 1999 .

[62]  Clive Neal-Sturgess,et al.  PEDESTRIAN INJURY - EFFECTS IN IMPACT SPEED AND CONTACT STIFFNESS , 2002 .

[63]  C. Got,et al.  Simulation of Collisions Between Pedestrians and Vehicles Using Adult and Child Dummies , 1975 .

[64]  J T Herridge,et al.  BODY VEHICLE INTERACTION EXPERIMENTAL STUDY. VOLUME II , 1975 .

[65]  Rolf H. Eppinger,et al.  Experimental Study of a Compliant Bumper System , 1983 .

[66]  B. Romanus,et al.  Clinical and experimental studies on leg injuries in car-pedestrian accidents , 1981 .

[67]  H Appel,et al.  REALIZATION OF PEDESTRIAN PROTECTION MEASURES ON CARS , 1983 .

[68]  Rod Jones,et al.  Aluminium Crash Management Systems , 2004 .

[69]  S. J. Ashton,et al.  INFLUENCE OF VEHICLE DESIGN ON PEDESTRIAN LEG INJURIES , 1978 .

[70]  P. F. Gloyns,et al.  EUROPEAN NEW CAR ASSESSMENT PROGRAMME (EuroNCAP) ASSESSMENT PROTOCOL AND BIOMECHANICAL LIMITS , 1999 .

[71]  S. J. Ashton.  A Preliminary Assessment of the Potential for Pedestrian Injury Reduction Through Vehicle Design , 1980 .

[72]  Stephen Shuler,et al.  Bumper Systems Designed for Both Pedestrian Protection and FMVSS Requirements: Part Design and Testing , 2004 .

[73]  Michael J. Walsh,et al.  Evaluation of a Pedestrian-Compatible Bumper , 1985 .

[74]  Michael D. Peck,et al.  Practical Analysis Methodology for Low Speed Vehicle Collisions Involving Vehicles with Modern Bumper Systems , 2003 .

[75]  Ingolf Schneider,et al.  Bumper assembly in or for a motor vehicle , 2006 .

[76]  Kouzo Maeda,et al.  Research concentrated on an experimental method for protecting pedestrians , 1985 .

[77]  Hiroshi Suganuma,et al.  Development of pedestrian protection analyzing technologies and its applications , 2003 .

[78]  Ho Kim,et al.  Optimization of Bumper System Under Various Requirements , 2001 .

[79]  H. Appel,et al.  Pedestrian safety vehicle - design elements: Results of in-depth accident analyses and simulation , 1978 .

[80]  R Sturt,et al.  EFFECT OF PEDESTRIAN PROTECTION ON STYLING AND ENGINEERING OF VEHICLES , 2000 .

[81]  Eric Jon Jaarda,et al.  Multiple Impact Prediction and Performance of Energy Absorbers , 2004 .

[82]  Darin Evans.  Correlation Study on Different Bumper Impact Test Method and Predicted Results , 2003 .

[83]  Young Woo Lee,et al.  Optimization of Bumper Structure for Pedestrian Lower Leg Impact , 2002 .

[84]  Pádraig Naughton,et al.  Bonded Hybrid Front-End Systems - An Approach to Design and Platform Strategies , 2002 .

[85]  Xuejun Liu,et al.  A Study of Influences of Vehicle Speed and Front Structure on Pedestrian Impact Responses Using Mathematical Models , 2002 .

[86]  Samuel Daniel.  THE ROLE OF THE VEHICLE FRONT END IN PEDESTRIAN IMPACT PROTECTION. IN: PEDESTRIAN SAFETY , 1982 .

[87]  木下有司,et al.  Front structure of vehicle , 2005 .

[88]  Claude Laurent,et al.  Car Front End Module Structure Development Regarding Pedestrian Protection and other Mechanical Constraints , 2001 .

[89]  O Bunketorp.  PEDESTRIAN LEG PROTECTION IN CAR ACCIDENTS AN EXPERIMENTAL AND CLINICAL STUDY , 1983 .

[90]  Wayne L. Kruse.  CALSPAN/CHRYSLER RESEARCH SAFETY VEHICLE FRONT END DESIGN FOR PROPERTY AND PEDESTRIAN PROTECTION , 1976 .

[91]  Flavio Friesen,et al.  Application of Stainless Steel in Crash Structures of Vehicles , 2004 .

[92]  D. G. C. Bacon,et al.  Bumper characteristics for improved pedestrian safety , 1976 .

[93]  Bertil Aldman,et al.  An experimental study of a modified compliant bumper , 1985 .

[94]  S. J. Ashton.  BIBLIOGRAPHY OF PEDESTRIAN ACCIDENT REFERENCE WITH EMPHASIS ON VEHICLE DESIGN AND PEDESTRIAN INJURIES , 1983 .

[95]  Janusz Kajzer,et al.  Examination of Different Bumper System Using Hybrid II, RSPD Subsystem and Cadavers , 1992 .

[96]  Dinesh Mohan,et al.  SAFER BUS FRONTS FOR PEDESTRIAN IMPACT PROTECTION IN BUS-PEDESTRIAN ACCIDENTS: A PRELIMINARY INVESTIGATION , 1992 .

[97]  Alessandro Zanella,et al.  Smart Bumper for pedestrian impact recognition , 2003, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[98]  Steve Mark.  PEDESTRIAN SAFETY UPPER LEGFORM BUMPER IMPACT SIMULATION , 2001 .

[99]  J Hoffmann,et al.  INVESTIGATION INTO THE USE OF ADAPTABLE CAR STRUCTURES CONCEPTS FOR PEDESTRIAN IMPACT PROTECTION , 2002 .

[100]  Ryan Miller,et al.  Development of a sport utility front bumper system for pedestrian safety and 5 mph impact performance , 2001 .

[101]  R. Kaeser,et al.  Motor car design for pedestrian injury prevention , 1986 .

[102]  H Appel,et al.  Influence of front-end-design of passenger cars on injuries of pedestrians in car-to-pedestrian collisions , 1976 .

[103]  E. G. Janssen,et al.  Experimental and Mathematical Simulation of Pedestrian-Vehicle and Cyclist-Vehicle Accidents , 1985 .

[104]  슐러 스테판,et al.  Pedestrian energy absorber for automotive vehicles , 2003 .

[105]  Pádraig Naughton,et al.  THE VIRTUAL STIFFNESS PROFILE - A DESIGN METHODOLOGY FOR PEDESTRIAN SAFETY. IN: PEDESTRIAN SAFETY , 2001 .

[106]  信田昌德,et al.  Front body structure of the vehicle , 2005 .

[107]  M Gaegauf.  DESIGN OF A PEDESTRIAN COMPATIBLE CAR FRONT , 1986 .

[108]  L. Grösch,et al.  Experimental Simulation of Car/Pedestrian and Car/Cyclist Collisions and Application of Findings in Safety Features on the Vehicle , 1989 .

[109]  K C Clemo.  THE PRACTICALITIES OF PEDESTRIAN PROTECTION , 1998 .

[110]  Rolf H. Eppinger,et al.  Optimal Design of Automobiles for Pedestrian Protection , 1977 .