Abstract: The current assessment method has strong subjectivity for dummy head injury in frontal impact test
in the European New Car Assessment Program (Euro-NCAP). This paper made improvements and gave a new
assessment method to avoid fine points due to miscarriage of justice. In the new method, the outside forces and
the accelerations of the dummy head were deduced by d’Alembert's principle, with the outer forceswere being
directly used to substituting the head acceleration curves by the resultant forces in old method. The new dummy
head assessment method was used in a 64-km/h frontal offset impact test of the E-NCAP for a developing
vehicle. The results show that bottoming-out does not happen for current airbag which satisfies deployment
requirements only with an improper choice for seatbelt. The new result pulls down the conclusion of airbag
bottoming-outbeing elicited by using the original assessment method. Therefore, the improved assessment
method is simpler, straighter, and more objective than the original method.

Key words: automobile engineering, passive safety, European New Car Assessment Program (Euro-NCAP), dummyhead injury, subjectivity assessment, airbag deployment