Characterization of Vehicle Deceleration Time Histories in the Analysis of Impact Dynamics

Analysis of minimum pulse shape information needed for accurate chest injury prediction in real life frontal crashes

“…This study indicates that four parameters are enough to describe the pulse from an occupant chest injury point of view. This is consistent with the result of Huang et al [5] who also concluded that 'approximations to vehicle deceleration involving as few as four parameters are adequate in many cases … to evaluate occupant dynamics'. While Huang et al used a simple 2-D representation of the occupant and restraint system, the present study confirms these results using detailed 3-D modelling, including a FE HBM, and tissue-based injury criteria.…”

“…Pulse shapes have previously been parameterized in many different ways, including polynomials or Fourier components [5], half sine approximations [6], two-step approximations [7], and different geometrical approximations such as haversine and triangular shapes [12]. Since the aim of this study is to evaluate how much of the pulse information is relevant from an injury point of view, a parameterization that can be gradually improved with the addition of parameters-all the way back to the original pulse-is required.…”

“…Other authors have used other types of pulse parameterization to study what parts of the pulse are relevant for injury outcome. Huang et al [5] simplified a pulse using low-order polynomials or Fourier components. The conclusion was that even very low-order polynomial or Fourier components, described with as few as four parameters, were enough to get a response within ±5% of the occupant injury recordings.…”

Simulation Optimization of the Crashworthiness of a Passenger Vehicle in Frontal Collisions using Response Surface Methodology

“…Vehicle deceleration profiles determined from the vehicle crash simulations are approximated by the piecewise-linear TESW (Tipped Equivalent Square Wave), as shown in Figure 3. While apparently crude, the TESW has been shown [12] to provide a consistently accurate summary of the vehicle response (the so-called "first collision") as this response is transmitted to the vehicle occupants (the so-called "second collisions"). The TESW has the advantage that it can be completely specified by four parameters which are easily identified from the simulated deceleration profiles.…”

Desenvolvimento de um veículo urbano seguro utilizando otimização baseada em metamodelos.

“…Uma característica básica da resposta estrutural de um veículo em teste e simulação de impacto é a "assinatura do impacto", conhecida como o pulso do impacto, Huang et al, 1977. Este pulso que descreve a natureza e severidade da colisão depende não somente do tipo da estrutura, mas também do local da medição e do tipo do impacto. • veículo sedan de quatro portas com estrutura em "body-in-white";…”