To provide a body structure for a railroad head car capable of reducing impulsive noise caused by a micro-pressure wave further than a conventional head car regardless of whether a tunnel is just a regular one without buffer work or the tunnel is a buffered one.
The cross sectional area of the car body is changed along the longitudinal direction so that the pressure gradient of a compression wave generated when the car enters in a tunnel without buffer work reaches the maximum value at the head part, and gradually decreases toward a general part through an intermediate part. The cross sectional area increasing rate of the head part Z1 decreases gradually in a front side sectional area increasing region Z11 in a range approximately from 5.0 m2/m to 2.5 m2/m, and the area ratio relative to the cross sectional area of the general part Z2 is within 0-0.30, respectively. The cross sectional area increases gradually from the intermediate cross sectional area increasing region Z12 and the rear side sectional area increasing region Z13 of the head part to the general part Z2 with a cross sectional increasing rate smaller than that in the front side sectional area increasing region Z11.
NARUSE ISAO
NAKAMURA SHUJI
KIMURA TOSHINOBU
KURIYAMA TAKASHI
TSUKAHARA KATSUYUKI
SANO ATSUSHI
NAKAI KAZUTO
KAWASAKI HEAVY IND LTD
Shinichi Nakajima
Next Patent: WINDOW ATTACHING STRUCTURE OF CONSTRUCTION VEHICLE