This paper describes an experimental investigation of the cavity evolution and shedding
wake behind a hydrophobic sphere during the water-entry process. Two distinct shedding …

A method to calibrate a force transducer under dynamic conditions has been developed.
Calibration is achieved by a drop ball test based on the levitation mass method using an …

In order to precisely measure water impact loads of a spherical structure vertically dropping
onto a calm water surface, a new validity check of the analysis using the levitation mass …

Drop ball test by the Levitation Mass Method (LMM) was carried out on a plastic sheet made
of PMMA. Impact response of PMMA was measured with high accuracy and accurately …

A method for measuring the dynamic impact responses that acting on a spherical object
while dropping and colliding with dried sand, such as the velocity, displacement …

It is important for crashworthiness of an aircraft fuselage and its structural components to
evaluate the aircraft airworthiness in crash-landing scenarios on different terrains (ie rigid …

Numerical studies were conducted on the hydrodynamics of a freely falling rigid sphere in
bounded and unbounded water domains to investigate the drag coefficient, normalized …

The impact force of spherical body dropping onto a water surface is measured using the
method which has been proposed by us. In the method, a cube corner prism is embedded in …

Drop ball test based on the Levitation Mass Method (LMM) is carried out on EPS board. In
our previous method, it became a problem that the accuracy of force calculated from the …

The uncertainty evaluation for 3D measurement of velocity in the Drop-ball experiment is
calculated. The drop-ball experiment is an experiment to evaluate the impact response of a …