Vehicle Crash Dynamics P1 ppt

... Fig. 1.1 Unitized Body Vehicle Fig. 1.2 Body-on-Frame Vehicle CHAPTER 1 CRASH PULSE AND KINEMATICS 1.1 INTRODUCTION A basic characteristic of a vehicle structural response in crash testing and model ... analyzing the crash pulse data for crashworthiness study. © 2002 by CRC Press LLC (1.9) Fig. 1.26 A Truck Crash Test Raw Data with Moving Window Averaging Fig. 1.27 1 st and 2...

Ngày tải lên: 03/07/2014, 19:20

... Therefore, the crash pulse can be considered to be rear-loaded. © 2002 by CRC Press LLC Table 2.6 Crash Pulse Analysis using FEW Mid-size Vehicle (Centerline Tunnel) Full-size Vehicle (Left Rocker ... the front wheel drive vehicle but also in the rear wheel drive vehicle. Fig. 2.29 shows the crash pulse at the left rocker on the B-pillar of a rear wheel drive full-size vehicle...

Ngày tải lên: 03/07/2014, 19:20

... the impactor. The sled test pulse is designed to duplicate the crash pulse recorded at the vehicle compartment in a test. Fig. 3.47 shows a crash pulse for a full-size sedan in a 35 mph barrier test. ... respective restraint transfer functions (such as torso restraint or knee bolster) with the vehicle crash pulse obtained from the full frontal barrier tests. 2. Prediction of head de...

Ngày tải lên: 03/07/2014, 19:20

... severity of a vehicle subjected to side, frontal, and offset impulsive loadings can be examined by the use of COCA. Under the same impulsive loading to the vehicle, different locations in the vehicle ... developing an air bag crash sensor system, judging the impact severity at any point on the vehicle can be expedited by examining the COCA for the magnitude and direction. Fig. 6.29 s...

Ngày tải lên: 03/07/2014, 19:20

... First using rotating base 5 Statics, dynamics, and strength of materials Elementary mechanics is traditionally partitioned into three courses named ‘statics’, dynamics , and ‘strength of materials’. ... machines, and the stability of boats. Dynamics concerns motion associated with the non-negligible acceleration of mass. Chapters 5-11 of this book introduce dynamics. As with statics, the...

Ngày tải lên: 25/01/2014, 15:20

... Press LLC (1.31) Fig. 1.59 Vehicle Energy Densities in Three Crash Tests 1.6.2 Vehicle Energy Density The energy density (e = energy/mass) of a vehicle during a crash can be computed by integrating the ... computing the p.r.d. of an entire crash pulse without using numerical integrations. Representing a crash pulse by p.r.d. serves to discriminate the crash severity of a v...

Ngày tải lên: 03/07/2014, 19:20

... manipulated and the crash severity can then be distinguished. 2.4.5 Use of Pulse Curve Length in Crash Severity Detection An algorithm using the curve length concept to analyze vehicle crash severity ... displacement changes. 2.4.7.2 Re-synthesis of a Crash Pulse Without Resonance Re-synthesis of a crash pulse is a process in which the resonance is removed, and the crash pulse...

Ngày tải lên: 03/07/2014, 19:20

... Fig. 3.24, exhibits a double hump wave and approximates the test vehicle crash pulse very closely. To assess the effect of the FEW crash pulse on the occupant response, the FEW is used as the input ... used. The crash test data, such as vehicle and occupant accelerometer data, for two trucks in rigid barrier 31 mph tests are used in this study. Table 3.4 shows the summaries of the o...

Ngày tải lên: 03/07/2014, 19:20

... (4.6). 4.3.1 Vehicle and Occupant Transient Kinematics The equations of motion for a simple vehicle !occupant model are reviewed. In a study by Huang [1] on vehicle and occupant crash dynamics, ... the vehicle and occupant are derived based on the vehicle equivalent square wave (ESW). These are shown as follows. © 2002 by CRC Press LLC Fig. 4.25 Vehicle/ Occupant Velocity Fig....

Ngày tải lên: 03/07/2014, 19:20

... Two-Mass System 4.7 VEHICLE- TO -VEHICLE (VTV) IMPACT: SPRING-MASS MODEL In this section, the relative motion concept is applied to a vehicle- to -vehicle (VTV) impact analysis. First, the crash pulse approximation ... applied to the vehicle- to -vehicle impact model, where the force deflection is elasto-plastic. 4.7.1 Crash Pulse Approximation by TESW and Sinusoidal Waves Methods c...

Ngày tải lên: 03/07/2014, 19:20