velocity error
6.In this paper, taking the measured error sound velocity profile as the initial guess value, the sound beam travel times and beam angle recorded by the multi-beam system and the generalized linear inversion method are used to get a sound velocity profile close to the actual sound velocity profile, and the inversed sound velocity profiles have contributed to the reduction of sound velocity profile error.
7.VELOCITY TRACKING AND ANGLE ERROR INFORMATION EXTRACTION BY FFT IN PDSTT
8.The systematic structure of the IHI pendular flying shear has been deeply analyzed,and the synergic relation between the cutting noumenon and the in phase mechanism has been expressed distinctly in the form of the transmission sketch. Then the optimal mathematic model has been esta blished by using the two main performance indexes ineluding the error betueen the horizontal velocity of the cutter and the feeding velocity and the error of pendular angle in the cutting area as sub objective function.
9.Flow velocity of LS68-1 horizontal-axis current meter is acceptable when dip angel is within 10 to 30 However,the measuring velocity is systematic shifting smaller when the dip angle is over 30 comparing with the actual velocity. Two methods that may narrow the error of measuring flow velocity are discussed.
