This paper addresses the problem of handling deformable linear objects in a suitable way to avoid acute vibration. Different types of adjustment-motions that eliminate vibration of deformable objects and that can be attached to the end of an arbitrary end-effector’s trajectory are presented. For describing the dynamics of deformable linear objects, the finite element method is used to derive th...

Sensitivity to disk vibration and large component number, which complicates assembly and optical alignment, are the drawbacks of traditional optical pickup systems. Here, a numerical method of designing a dual-wavelength diffractive objective lens with high numerical aperture for generating arbitrarily discrete, diffractionless beams with extended depth of focus is presented. Simulation and exp...

An iterative learning control method is proposed to achieve precise tracking control and end-point vibration suppression of a flexible manipulator system. The learning is done in a feedback configuration with collocated PD control and the learning law updates the feedforward input from the error of the previous trial. Simulation results of the response of the manipulator with the controller are...

Bearing fault diagnosis has attracted significant attention over the past few decades. It consists of two major parts: vibration signal feature extraction and condition classification for the extracted features. In this paper, multiscale permutation entropy (MPE) was introduced for feature extraction from faulty bearing vibration signals. After extracting feature vectors by MPE, the support vec...

In this paper, a new and simple approach for the vibration control of flexible spacecrafts during the attitude maneuvering is proposed. Our control strategy integrates the command input shaping and Reference Model Variable Structure Output Feedback Control (RMVSOFC) techniques. In this method, the input shaper is implemented outside of the feedback loop to achieve the exact elimination of the r...

This paper discusses performance improvement for a space manipulator termed JEMRMS. Space manipulators such as JEMRMS are subject to vibrations due to structural flexibility. To cope with such a drawback, control strategies for minimization of vibration excitation and for maximization of vibration damping have already been developed. However those strategies require an accurate model of the man...

To compensate the flaws of single neural network such as low classification precision and long training time as well as weak generalized ability etc, the paper proposes a novel ensemble neural classifier for stream turbine vibration fault diagnosis with improved PSO-based. The method fully utilizes the advantages of PSO, such as fast seeking speed and easily realizing mode etc, the integrated t...

A computational study of helicopter vibration and rotor shaft power reduction is conducted using activelycontrolled trailing-edge flaps (acfs), implemented in single and dual flap configurations. Simultaneous vibration reduction and performance enhancement is demonstrated under level flight condition at high advance ratios, where dynamic stall effects are significant. Power reduction is achieve...

The consecutive speed-control humps (SCHs) possess the function of controlling speed forcibly, but cause violent vibration of a vehicle inevitably. This paper tries to further explore the inherent link among parameters of the SCHs, velocity and vehicle vibration. A 4-DOF nonlinear half-vehicle model with nonlinear springs and nonlinear dampers is established. The consecutive SCHs-speed coupling...