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Squeak & Rattle Correlation in Time Domain using the SAR-LINE™ Method

SAE International Journal of Passenger Cars - Mechanical Systems

SAAB Automobile AB-Jens Weber, Ismail Benhayoun
  • Journal Article
  • 2012-01-1553
Published 2012-06-13 by SAE International in United States
A new Squeak & Rattle simulation method was presented at the ISNVH conference 2010 (SAE 201-01-1423). This method, called the SAR-LINE™ method, is based on the evaluation of the relative displacement in time domain due to a random load. A specific challenge for a Squeak & Rattle simulation approach is to correlate the results to a real squeak or rattle phenomenon. This paper presents a new test procedure which enables the correlation between the results of the SAR-LINE™ simulation and the audible rattle occurrence. Three different configurations with increasing complexity were both tested and simulated. A pseudo random signal was used as load and the relative displacement was measured with the Laser Scanning Vibrometer in time domain. The movement in the gap and the rattle sound were recorded in a video sequence. The simulated results along the SAR line can directly be compared with the measured results along the gap. It is shown how the correlation between the rattle occurrence and the simulation results can be performed with the statistical evaluation approach of the SAR-LINE™…
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Vehicle Aerodynamics Design and Technology

SAAB Automobile AB-V. Sumantran
DaimlerChrysler-Mark Gleason
  • Special Publication (SP)
  • SP-1600
Published 2001-03-05 by SAE International in United States
This volume is divided into five sections including experimental aerodynamics, computational aerodynamics, on-road and unsteady aerodynamics, wind noise and aerodynamic design.

Pressure and load patterns on seat interface: A comparison between human subjects and crash test dummies

SAAB Automobile AB-Kristina Wiklund, Stefan Frid
Delphi Automotive Systems-Wenqi Shen, Bala Swamy, Gert Nilson, Mladen Humer
  • Technical Paper
  • 1998-13-0031
Published 1998-09-16 by International Research Council on Biokinetics of Impact in Switzerland
This study compares pressure and load patterns on the seat back generated by humans to those by Hybrid-III dummies in low severity rear impacts. 12 healthy human subjects, along with the fifth percentile female and 50th percentile male Hybrid-III dummies, were used as test subjects. During the tests, the interface pressure distribution between seat and human or dummy was collected by means of a Tekscan system, at a rate of 50 frames/sec. The test seat was mounted to a mini-sled, which was powered by a bungy-cord. The bungy-cord accelerated the sled to a speed of about 1.3 m/s (5 km/h) when the sled was brought to stop by means of a hydraulic damper. The stopping distance was approximately 30 mm which generated a deceleration pulse of about 3G. The results showed that at impact peaks, total dynamic loading due to human or dummy trunk weight on the seat back increased from static loading. Not only dummy loading increased more than human loading, but also for dummies, a larger portion of load transferred from lower back…

Characterization of Steel Sheet Surfaces in Order to Predict Surface Appearance After Painting

SAAB Automobile AB-Mats Haldén, Lars-Erik Brattström
  • Technical Paper
  • 1997-20-0137
Published 1997-09-30 by Automotive Technology Group, Inc. in United States
A new surface parameter is described, Ra-macro, which is developed to give a simple characterization of the steel sheets influence on the paint appearance (orange peel) on vertical surfaces. If the surface of the steel sheet can combine both low Ra-macro values and relatively high Ra values than an optimal paint appearance with maintained drawability has been achieved. Ra-macro is in this report compared to Ra, Rt, Wa, Wca, Wcm and Pc which also have been described as having a significant effect on the paint appearance. The surface quality of the steel sheets were SBT, EDT, and EBT. The evaluation of orange peel (paint appearance) is made by a Wave scan, BYK Gardner.
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Passenger AIR-BAG Status Indication Awareness Study

SAAB Automobile AB-Martin Ericson
Swedish National Road and Transport Research Institute-Lena Nilsson, Maria Berlin
Published 1997-02-24 by SAE International in United States
With the growing concern about the potential dangers with rear facing child seats placed in the front seat of passenger airbag equipped cars, various systems are being considered for deactivation of the airbag.To increase the awareness of and confidence in these proposed systems, information displays were developed for the purpose of telling the status of the passenger airbag system and to warn when necessary. A study of the effectiveness, understanding and acceptance of a selection of such information displays was jointly undertaken by Volvo Car Corporation, SAAB Automobile AB and the Swedish National Road and Transport Research Institute.Respondents of various age and demographic composition, parents and grand parents of small children, were exposed to six different sets of information displays and were asked to interpret them and also rank which information displays that would most clearly convey the message. Conclusions were drawn concerning information content, symbols and colours.The study did also investigate the respondents preference regarding automatic or manual disconnection airbag system.
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Rear-End Collisions - A Study of the Influence of Backrest Properties on Head-Neck Motion using a New Dummy Neck

SAAB Automobile AB-Stefan Larsson
Chalmers University of Technology-Mats Y. Svensson, Per Lövsund
Published 1993-03-01 by SAE International in United States
Neck injuries in rear-end collisions are usually caused by a swift extension-flexion motion of the neck and mostly occur at low impact velocities (typically less than 20 km/h). Although the injuries are classified as AIS 1, they often lead to permanent disability. The injury risk varies a great deal between different car models. Epidemiological studies show that the effectiveness of passenger-car head-restraints in rear-end collisions generally remains poor.Rear-end collisions were simulated on a crash-sled by means of a Hybrid III dummy with a new neck (Rear Impact Dummy-neck). Seats were chosen from production car models. Differences in head-neck kinematics and kinetics between the different seats were observed at velocity changes of 5 and 12.5 km/h. Comparisons were made with an unmodified Hybrid III.The results show that the head-neck motion is influenced by the stiffness and elasticity of the backrest as well as by the properties of the head-restraint. The elastic rebound of the backrest can aggravate the violence of the whiplash-motion and delay contact between the head and the head-restraint.
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