| Hull vibration would have adverse effects on ship equipments, and as well as the comfort of the passengers, which makes the hull vibration become one of the issues being concerned. As the traditional method of hull vibration takes a lot of time, cost and energy, the precision of which is also affected. In recent years, the appearance of virtual test technique broke through the limitation of traditional test, and provided an effective way to test and analyze the equipments or systems which have complex structure, high difficulty and cost in testing course. In the paper, virtual test technique for forced vibration of hull structure was studied, and the main works were as follows:1. The main excitation source and influencing factors were introduced, which would cause the steady vibration, and clearly gave the calculation method of the exciting forces, as the external load of the virtual test.2. Proposed a method by applying the finite element dynamic analysis to calculate the forced vibration of hull, and used an example to make the transient response analysis, which verified the feasibility of the method to be applying to virtual testing.3. Expounded the meaning and key points of virtual test technique, according to the testing method of real ship vibration, discussed the basic idea and implementation of virtual test technique of the forced vibration of hull structure.4. According to the technical blue print, the overall framework of the virtual test system was designed, the key techniques to carry out virtual test for forced vibration of hull structure were confirmed, and by programming with Visual C++ and OpenGL such a virtual test system was developed.5. A virtual test model of a 17000 DWT multi-purpose cargo vessel was set up, one typical full loading departure condition was selected, with the forced vibration virtual testing, the displacement, velocity and acceleration responses in time domain of certain measuring points can be shown under the external forces and moments.
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