An Alternate Dynamic Test Methodology for Side Crash Sensor Evaluation and Calibration
Publication Date: 2008-Sep-29
The IP.com Prior Art Database
An Alternate Test Methodology for Vehicle Side Crash Sensor Development
The increased complexity of different side impact test modes (IIHS, LINCAP, FMVSS214, FMVSS201 Pole, FMVSS214 Oblique Pole and ECE95) and vehicle configurations/options (4x4, 4x2, Cab styles, Vehicle Weight, Running Board, etc.) has led to an increase in full-vehicle prototypes required for sensor system development and final certification. Further, The sensor waveform especially in high speed side impact test modes (LINCAP, IIHS, FMVSS214) require shorter time duration for decision making (typically less than 20 msec) compared to other low speed Deploy/Non-deploy test modes. Hence, development of an alternate test methodology to replace full-vehicle prototype poses a great challenge, as side impact sensor development requires accurate simulation of structural responses very early in the crash event.
A novel alternate vehicle sub-system test methodology was developed based on Impulse-Momentum approach to replicate various full-vehicle side impact test modes.
During a side impact, a significant portion of the vehicle mass (MCG) is distributed away from the Center of Gravity (C.G.) of the vehicle, closer to the impact location (Mside). Early in the crash event, the impacting Moving Deformable Barrier (MDB) does not engage the entire mass of the vehicle, but only a part of it, depending on the lateral stiffness (Klat) of the vehicle, leading to the concept of Effective Mass. The effective mass of the vehicle engaged by the MDB during the crash event was calculated as a function of time using Impulse-Momentum approach.
Schematic to illustrate the Concept and Derivation of Effective...