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The mechanical robustness during the operational shock (op-shock) is of great concern for the reliability of hard disk drives (HDDs). Owing to lack of understandings on the op-shock response of HDDs, the design optimizations for improving op-shock resistance are mainly based on plenty of experiments which are expensive and lengthy. This paper studies the mounting support effect on the op-shock response...
This paper investigates a novel control strategy for the position and attitude tracking control problem of a quadrotor UAV based on terminal sliding mode control. To realize the control objective, the model of the quadrotor UAV with six degrees of freedom which is actually a class of underactuated systems, is reasonably divided into a fully actuated subsystem with two degrees of freedom and an underactuated...
The random finite set (RFS) approach offers a natural and smart means to model multi-target and measurements received by the multi-sensor. The probability hypothesis density (PHD) filter propagates a multi-target statistical first moment, the PHD in place of the full multi-target posterior distribution. But there is no closed form solution to the PHD recursion. The Gaussian mixture probability hypothesis...
Based on the detailedly overview of SINS error modeling method, this paper discusses the SINSpsila error models with different math expression methods within the same reference coordinate system, and their relationship. As well it discusses the conversion relationship of certain mathematical error model between different reference coordinate systems. Specific to t-Frame and c-Frame, it detailedly...
Proceeding from actual needs of AINS initial alignment technology, this paper is specific to rigidity carrier ship, and it deduces the model equations of Airborne Inertial Navigation System's velocity and acceleration (ecificforce) with the effect of arm-lever vector. It employs the method that establishes large initial misalignment angle transfer alignment model of AINS, which is other than traditional...
Abrasive water jet can be applied to perforate the oil formation rock. The perforation depth generated by abrasive water jet is nonlinearly influenced by so many factors that it is difficult to mathematically correlate the perforation depth with influencing factors. So the back propagation (BP) neural network is introduced to establish the model for predicting perforation depth generated by abrasive...
Errors due to split time stepping are discussed for an explicit free–surface ocean model. In commonly used split time stepping, the way of time integration for the barotropic momentum equation is not compatible with that of the baroclinic one. The baroclinic equation has three–time–level structure because of leapfrog scheme. The barotropic one, however, has two–time–level structure when represented...
The development of a new type of two-closed-loop EEG feedback control system based on an IBM PC/AT computer is presented, and the specific measure of artifact rejection for clinical practice of this system is discussed. The system, with varied EEG's index outputs on the CRT and the printer, organically combines the EEG biofeedback and physical stimulation feedback control, and fully utilizes the latest...
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