Compared with offline simulation based on software

completely, Hardware-in-the-loop Simulation (HILS) is a

simulation method based on software and hardware coupling,

which can not only verify the principle of the model studied, but

also feedback hardware response for comparison, shorten

product test cycle, improve research and development efficiency

and accuracy. Taking the marine nuclear reactor as the

background, this paper modelled the main circuit of energy

power and the part of propulsion power output, simulated the

energy power module offline based on Modelica language, and

coupled Arduino MCU with LEGO parts to simulate the

hardware response of propulsion power output. This study used

OpenModelica to construct the steady-state and transient

simulation operation of the off-line simulation model, realized

the interaction between the hardware signal input and the offline

simulation model, processed the mechanical response of the

simulation output and communicated with the external

hardware. Finally, the feedback action response was compared

with the key parameters in the existing literature. The results

show that the simulation results of the model and the hardware

response feedback results are consistent with the literature

parameters, and based on the coupling of Modelica language

with Arduino MCU can carry out the HILS for the marine

nuclear power system in steady state and transient state.