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September 2006 - Accident Reconstruction Newsletter Welcome to the September 2006 edition of the Accident Reconstruction Newsletter. We are very excited to announce that the second issue of Collision: The International Compendium for Crash Research will begin shipping the first week of November. This issue completes the first Volume (Issues one and two). In addition to all the new, never-before published articles, this issue will also include the 2006 ARC-CSI Crash Conference DVD! We switched this year to a DVD to be able to provide more data. The DVD contains over 70 crash test video clips from the conference, 100's of digital photos, crash test scene diagrams, speaker presentations, and of course all the instrumented vehicle crash data. All-in-all over 2 Gigabytes of information!!!! If you are a member of NAPARS AND have paid the upgrade fee, you will automatically receive this issue. If not, there is still time to subscribe. Subscriptions beginning with Vol. 1, Issue 2 ends on Monday November 23, 2006. After that date, subscriptions will start with Volume 2, Issue 1 and this issue will only be available as a back issue. Click here to subscribe. Next month the ARC Network will be in South Lake Tahoe with an exhibitor booth at the CAARS conference. If you would like to attend, please visit the CAARS web site. Date: November 16-18, 2006. The ARC Network is also getting ready for the upcoming CDR User's Conference. The conference will be held in Houston, TX, January 29-31, 2007. This conference focuses on Crash Data Retrieval and the CDR System. This conference typically sells out, so we advise you to register early to guarantee a seat and a hotel room. Early registration ends December 15, 2006. For complete information, please visit www.crashconferences.com The ARC Network is planning on adding some new features to the members only section next year, if there is anything you would like to see improved or added, please send us an email. Thank you for making the ARC Network the number one organization and web site for accident reconstruction and traffic investigation. Sincerely, Scott Baker Railroad Safety Statistics 2004 Abstract The Federal Railroad Administration (FRA) has established an ultimate goal of “Zero Tolerance” for railroad related accidents, injuries and fatalities. In pursuit of that goal, significant progress has been made, particularly over the past six years, in reducing the number of train collisions, derailments, highway-rail grade crossing incidents, and injuries to railroad workers. These results have been achieved because of a collaborative effort involving the FRA, railroad management, rail labor, equipment suppliers, and contractors, as well as other federal and state agencies whose mission involves ensuring railroad safety. Central to the success of this rail safety effort is the ability to understand the nature of rail- related accidents and to analyze trends in railroad safety. 2006 Los Angeles Auto Show Special Engagement On Wednesday December 06, 2006 law enforcement vehicle theft investigators and NICB agents will be allowed to enter the Los Angeles Auto Show being held at the Los Angeles Convention Center from 0630 hours to 1100 hours for vehicle identification training. At 1100 hours the show will open to the public. It will be the seventeenth annual law enforcement training day, sponsored by Toyota, the National Insurance Crime Bureau and the Los Angeles Police Department, CCDCATs. Refreshments will be provided by Toyota and the NICB in the West Hall lobby between 0630 and 0730 hours. Admission is free, but there will be a charge for parking. The training is provided to allow vehicle theft investigators an opportunity to inspect new vehicle identification numbers. The theme "IF YOU DON'T KNOW WHAT A GOOD IDENTIFICATION NUMBER LOOKS LIKE, YOU WON'T RECOGNIZE A BAD ONE" reflects the purpose and scope of the training. NOTE: This training is funded and organized specifically for TRAINING purposes and is NOT intended as an opportunity to get into the Auto Show free. (No one other than law enforcement vehicle theft investigators will be allowed to enter. (i.e. no kids or family members) Location: Los Angeles Convention Center, West Hall entrance Hinton Train Collision Abstract The Hinton train collision was a railway accident that occurred on February 8, 1986. Twenty-three people were killed in a collision between a Canadian National Railway freight train and a VIA Rail passenger train. It was the most lethal Canadian rail disaster since the Dugald accident of 1947. |
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Analysis Of Collision Safety Associated With Conventional And Crash Energy Management Cars Mixed Within A Consist Abstract A collision dynamics model of a passenger train-to-passenger train collision has been developed to simulate the potential safety hazards and benefits associated with mixing conventional and crash energy management (CEM) cars within a consist. This paper presents a comparison of estimated injuries and fatalities for seven collision scenarios based upon the variable mix of conventional and CEM cars. Based on the analysis results, recommended car placement when mixing cars within a consist is identified. The model includes a 6 car cab car-led consist colliding with a 6 car locomotive-led stationary consist. The stationary consist is made up of all conventional cars. The moving consist has a variable mix of conventional and CEM cars. For comparison, the bounding scenarios are: - a moving consist with all conventional cars, and The collision speed ranges from 15 to 35 mph. Analysis of Occupant Protection Strategies In Train Collisions Abstract A study of the occupant dynamics and predicted fatalities due to secondary impact for passengers involved in train collisions with impact speeds up to 140 mph is described. The principal focus is on the effectiveness of alternative strategies for protecting occupants in train collisions, including friendly interior arrangements and occupant restraints. Train Crashworthiness Design For Occupant Survivability Abstract Studies were conducted evaluating the effectiveness of alternative strategies for providing crashworthiness of the vehicle structures. Conventional practice results in cars of essentially uniform longitudinal strength. The crash energy management approach requires varying strength through the train, with high strength in the occupied areas and lower strength in the unoccupied areas. Impact Tests of Crash Energy Management Passenger Rail Cars: Analysis And Structural Measurements Abstract Two full-scale impact tests were conducted to measure the crashworthiness performance of Crash Energy Management (CEM) passenger rail cars. On December 3, 2003 a single car impacted a fixed barrier at approximately 35 mph and on February 26, 2004, two-coupled passenger cars impacted a fixed barrier at approximately 29 mph. Coach cars retrofitted with CEM end structures, which are designed to crush in a controlled manner were used in the test. These test vehicles were instrumented with accelerometers, string potentiometers, and strain gages to measure the gross motions of each car body in three dimensions, the deformation of specific structural components, and the force-crush characteristic of the CEM end structure. Collision dynamics models were developed to predict the gross motions of the test vehicle. Crush estimates as a function of test speed were used to guide test conditions. This paper describes the results of the CEM single car and two-car tests and provides results of the structural test. The single-car test demonstrated that the CEM design successfully prevented intrusion into the occupied volume, under similar conditions as the conventional test. During both CEM tests, the leading passenger car crushed approximately three feet, preserving the occupant compartment. In the two car test, energy dissipation was transferred to the coupled interface, with crush totaling two feet between the two CEM end structures. The pushback of the couplers kept the cars inline, limiting the vertical and lateral accelerations. In both the conventional tests there was intrusion into the occupant compartment. In the conventional two-car test sawtooth lateral buckling occurred at the coupled connection. Overall, the test results and model show close agreement of the gross motions. The measurements made from both tests demonstrate that the CEM design has improved crashworthiness performance over the conventional design. Rail Equipment Crashworthiness Research Abstract The Federal Railroad Administration (FRA) has been working with the Volpe National Transportation System Center (Volpe Center) to conduct research into rail equipment crashworthiness. The approach in conducting this research has been to propose strategies for improved crashworthiness and to apply analytic tools and testing techniques for evaluating the effectiveness of those strategies. The information from this research has been used to develop the crashworthiness requirements for Amtrak's high-speed trainset, to develop the FRA's Passenger Equipment Safety Standards, and to draft revisions and additions to current FRA locomotive crashworthiness regulations and the Association of American Railroads (AAR) standards. This research was also applied to support the FRA in evaluating Amtrak's request to grandfather Talgo equipment for continued use in the Pacific Northwest. Information from the research is currently being used by the American Public Transportation Association (APTA) to develop further and refine industry standards and recommended practices for rail passenger equipment crashworthiness. And will support FRA efforts to make improvements to its passenger equipment safety standards as well. Job Posting: ATA Associates, Inc. Job Duties The applicant will be responsible for investigating, analyzing, and reconstructing the cause and origin of accidents. The fields of work include automotive, trucking, marine, aviation, products, and industrial settings. The applicant will be required to work with other individuals obtaining information regarding the accident through interviewing witnesses, scene documentation, inspections, testing, and analysis. Interaction with clients will occur on a regular basis in a written and oral form. The applicant will be required to provide expert testimony in depositions and in trial. Knowledge/Skills A Bachelor’s Degree in Engineering is required, mechanical engineering preferred, and a minimum of five (5) years of professional experience. A Professional Engineering License is preferred and an EIT required. Must be able to communicate with all levels of personnel both verbally and written. Must be able to travel nationally and have work schedule flexibility. The applicant must be able to work outdoors in hot/cold weather conditions for long periods with mobility and strength to lift up to fifty (50) pounds. Resumes Please send resumes to ata@ataassociates.com. ATA Associates is a nationally recognized engineering forensics organization founded in 1974. Consult our website at www.ataassociates.com for further details. Please respond via e-mail or mail with a detailed resume including: full education and training, work history, skills, qualifications, publications and three references with names and phone numbers. Train Crash Test Videos
Accident Reconstructionists Assist In Katrina Relief Efforts
Truck/Trailer Air Brakes Abstract As a result of the changes to Federal Motor Carrier Safety Regulation 49CFR Part 393.47 on August 15, 2005 this article provides valuable information for reference and the inspection of mechanical components of an air brake system. The new regulations provide for the integrity of the mechanical components. Railroad Locomotive Safety Standards: Clarifying Amendments; Headlights and Auxiliary Lights Summary This rulemaking action makes a technical clarification to certain locomotive headlight and auxiliary light provisions. The purpose of this modification is to codify FRA's longstanding acceptance of lamps used in locomotive headlights and auxiliary lights. FRA believes that the clarifications being made in this document are consistent with both FRA's intent when issuing the requirements related to locomotive headlights and auxiliary lights and FRA's enforcement policies related to those provisions. FRA also believes that the clarifications contained in this document further FRA's goal of facilitating the use of advanced technologies and enhance FRA's safety enforcement program by recognizing specific types of lamps it considers acceptable for use in headlights and auxiliary lights. In-Vehicle Cell Phone Use - Assessing Accident Risk Abstract Mobile phone use in motor vehicles has increased at a remarkable rate over the past 15 years. Yet it is undeniable that utilizing a cell phone while driving can affect driver performance as it relates to the overall safe operation of a vehicle. There are a number of things to consider in deciding whether the trade off in convenience is worth the potential risks associated with the distraction created by a cell phone. Train-To-Train Impact Test: Analysis of Structural Measurements Abstract This paper describes the results of the train-to-train impact test conducted at the Transportation Technology Center in Pueblo, Colorado on January 31, 2002. In this test, a cab car-led train, initially moving at 30 mph, collided with a standing locomotive-led train. The initially moving train included a cab car, three coach cars, and a trailing locomotive, while the initially standing train included a locomotive and two open-top hopper cars. The hopper cars were ballasted with earth such that the two trains weighed the same, approximately 635 kips each. The cars were instrumented with strain gauges, accelerometers, and string potentiometers, to measure the deformation of critical structural elements, the longitudinal, vertical, and lateral car body accelerations, and the displacements of the truck suspensions. The test included test dummies in the operator’s seat of the impacted locomotive, in forward-facing conventional commuter passenger seats in the cab car and first coach car, and in intercity passenger seats modified with lap and shoulder belts in the first coach car. RECONSTRUCTIONISTS FIND THAT AIR BRAKE EVALUATIONS ARE MORE EFFECTIVE WITH THE BRAKE INSITE ABSTRACT READ THE FULL ARTICLE Collision Magazine: The International Compendium for Crash Research
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