PURPOSE: To enable simulation of oscillation in a short wave top irregular wave of a ship and a marine construction off shore or along coast by generating an even direction spectrum wave having a projected direction distribution function.
CONSTITUTION: A test water tank 11 is made larger in length L than a width B thereof with L/B exceeding about 10. A wave generated with an artificial irregular water wave generator 10 is reflected repeatedly on both side walls on a long side 23 of the test water tank 11 to generate a directive wave in a wide range within the test water tank 11. At this point, a wave making signal generated preliminarily is sent to a driver 17 of each wavemaking unit 15 and with a controller 13, a wave making signal is outputted as corrected based on a correction amplitude ratio characteristic. Thus, a specified direction spectrum wave can be generated on the test water tank 11 as desired.
YAMAGISHI NAOTO
YAMASHITA SEIYA