TAILIEUCHUNG - Vehicle Crash Dynamics P14

In general, it is the BEV (not the )V) that describes the VTV crash severities in a complete manner. Only in the fixed barrier test condition or when the stiffness ratio equals the mass ratio, will BEV (or crash severity index) be the same as )V (or crash momentum index). This relationship can be proved by simply making Rm = Rk and substituting into Eq. (). Then BEV1/Vclose = )V/Vclose = 1/(1+Rm). Crash Severity Assessment by a Power Curve Model This section presents a model with power curve force deflection, as shown in Fig. . The model is used. | In general it is the BEV not the V that describes the VTV crash severities in a complete manner. Only in the fixed barrier test condition or when the stiffness ratio equals the mass ratio will BEV or crash severity index be the same as V or crash momentum index . This relationship can be proved by simply making Rm Rk and substituting into Eq. . Then BEVj Vclose V Vclose 1 1 Rm . Crash Severity Assessment by a Power Curve Model This section presents a model with power curve force deflection as shown in Fig. . The model is used to assess the crash severity of a mid-size passenger vehicle in a vehicle-to-vehicle test. The velocity change and fixed barrier equivalent velocity BEV of a 1985 Merkur which is struck from the front by a NHTSA Moving Deformable Barrier MDB at 70 mph will be estimated. This test a central collinear impact was conducted at Calspan Corp. under a contract to NHTSA. The crash severity of the Merkur will then be analyzed and compared with that of NCAP New Car Assessment Program at a 35 mph rigid barrier test condition. Fig. A Non-linear Two-Mass Impact Model Power Curve Model and Methodology Power curve force-deflection model can be utilized to perform the following tasks 1 impact modeling with loading and unloading simulations 2 computations of the barrier equivalent velocity BEV and 3 velocity change . of a vehicle during impact. Modeling of the two-vehicle impact was effected using a two-mass and two-EA non-linear-spring Energy Absorber model. This was used for both validation and prediction. The model simulates vehicle-fixed barrier and vehicle-vehicle impacts. In the vehicle-fixed barrier impact only one set of data for the subject vehicle is specified. The other set of data for the second vehicle in the model is simply the mirror-image of the first set. Note that in the vehicle-fixed barrier impact the velocities of the two vehicles are equal and opposite. The mass and velocity of the two vehicles are defined .

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