Modeling and Error Analysis of Hydrodynamic Experimental Apparatus

A hydrodynamic experiment apparatus is constructed to accomplish the measurement of hydrodynamic force on three-dimensional. This paper firstly introduces the mechanical structure of the novel hydrodynamic experiment apparatus. Then, it introduces the mathematical modeling of the hydrodynamic experiment apparatus which is based on the relationship between measurement data and the force on experiment subject. Finally, the error source of the mechanical structure and load cells were analyzed and the error compensation model is established to improve the measurement accuracy.

Application of Schroeder-Phased Harmonic Signals to Practical Identification

A multi-frequency identification scheme employing low peak-factor test signals is described. These signals may be designed using a simple formula originally due to Schroeder and may, additionally, be tailored to suit, most conveniently, signal processing based on the Fast Fourier Transform algorithm. The use of method in practice is shown by presenting results from a hydrodynamic experiment.