Showing papers in "Mechanism and Machine Theory in 2014"

TL;DR: In this paper, a modified cantilever beam model is used to represent the external gear tooth and derive the analytical equations of the bending, shear and axial compressive stiffness.

TL;DR: In this article, a novel fault feature extraction method based on the local mean decomposition technology and multi-scale entropy is proposed, which is used as a pretreatment to decompose the nonstationary vibration signal of a roller bearing into a number of product functions.

TL;DR: Results indicate that the proposed method is able to discriminate the different fault categories and degrees effectively, compared with previous approximate entropy and sample entropy methods.

TL;DR: In this paper, a flexure-based mechanism with three piezoelectric actuators is proposed to achieve desired displacements in X, Y and θ, where the lever based amplification is used to enhance the displacement of the mechanism.

TL;DR: In this paper, a method of determination of parameters for LuGre and Dahl dynamic friction models is presented, in which the objective function is a minimisation of the sum of squares of relative errors between the actual and modelled friction hysteresis courses.

TL;DR: In this paper, a rigid-flexible coupling model of the slider-crank mechanism is described, using the software ADAMS, in which the crank shaft and linkage are treated as flexible bodies, and the effect of the clearance of the joints between the cranks and the main linkage, and between the crosstalk and main slider are taken into account.

TL;DR: In this article, Fourier series analysis is used to explain the sideband patterns in the resulting vibration spectra, which differ significantly from the spectra of a normal fixed-axis/parallel gear pair system.

TL;DR: In this paper, a reconfigurable modular parallel robot is presented, where the spherical joint which connects each leg to the end-effector is realized as a combination of revolute pairs; a locking system allows one to alternatively fix one of the revolute joints, giving the machine different 3-CPU kinematic configurations which correspond to different types of mobility.

TL;DR: In this article, a 3-R RR parallel mechanism with six imperfect joints is analyzed, and the authors show that the joint clearances have considerable effects on the displacement and velocity of the moving platform, and have great influence on the acceleration and driving moments.

TL;DR: In this article, the theoretical analysis of drag torque within a two-speed dual-clutch transmission is presented, and the numerical models are developed to study the different sources of drag torques in dual clutch transmission, which can be applied to assess the efficiency of the transmission.

TL;DR: In this paper, the reconfiguration analysis of a 3-DOF (degrees-of-freedom) parallel mechanism with multiple operation modes was performed using the Euler parameter quaternions and algebraic geometry approach.

TL;DR: In this article, a geometric and kinematic analysis of the 3-RPS parallel manipulator is performed using algebraic equations, and conditions for singular poses are derived from the constraint equations by discussing the Jacobian of the set of constraint equations.

TL;DR: In this article, a cable-driven snake arm robot with a unique twin actuation construction and a Jacobian-based stiffener was proposed to maintain the cable tension in any arbitrary configuration.

TL;DR: In this article, a diamond kinematotropic chain is integrated in the construction of a new family of reconfigurable parallel mechanisms, which can provide a constraint force and a constraint couple.

TL;DR: In this paper, the authors introduced the notion of rolling bearing speed-varying stiffnesses introduced and explained by studying the relations of load-deflection through the bearing dynamic model which is based on Jones & Harris's efforts.

TL;DR: In this paper, a hand exoskeleton for rehabilitation is proposed, which adopts a symmetrical pinion and rack with a parallel sliding mechanism, which can cover a wide workspace of the finger and adapt to fingers of different thickness.

TL;DR: In this paper, a two-stage cycloidal speed reducer with tooth modifications is proposed, and the topological structure of cycloidal drives is discussed and analyzed with the aid of graphs.

TL;DR: In this paper, a systematic analysis methodology is proposed to find out all the suitable schemes for power-split hybrid electric vehicles from a variety of compound-split configurations, based upon the characteristics of mechanical point and PSD itself, three reasonable 4node lever models are confirmed.

TL;DR: In this paper, a model of angular contact ball bearing, which is subjected to a combined action of radial, axial and moment loads, is performed, where the effect of the centrifugal force and the gyroscopic moment are especially considered.

TL;DR: In this paper, a shift control strategy and related experiments for dry dual-clutch transmissions (DCT) have been analyzed by model simulation and the results show that the proposed control strategies satisfy the shifting requirement in terms of shift response and smoothness.

TL;DR: In this paper, a complete method to design tooth profile and its backlash assessment in harmonic drive is presented, where parametric equations are expressed for all segments of the DCTP.

TL;DR: In this article, a dynamic model for the slider-crank mechanism with clearance on the piston-pin revolute joint is presented, where the effects related to contact, friction and lubrication at the elements that operate in the clearance are the targets of study.

TL;DR: In this paper, the general form of objective function and design constraints for the volume/weight of a gearbox has been written and the practical graphs from the results of the optimization are presented.

TL;DR: The main focus of the paper is to examine the performance of the multiclass ability of SVM technique by optimizing its parameters using the grid-search method, the genetic algorithm (GA) and the artificial-bee-colony algorithm (ABCA).

TL;DR: In this article, an interval linearization method for the sensitivity analysis of manipulators to variations in their geometric parameters is presented, which is simple to implement and provides verified results in low computational time and thus can be applied to complex robots such as the Orthoglide.

TL;DR: In this article, a family of deployable prism mechanisms based on the Hoekens straight-line linkage is proposed, which can be deployed and compacted in a single dimension.

TL;DR: This paper presents novel parallel hybrid-loop manipulators and a novel design method based on the constrained motion properties of related spatial overconstrained linkages and general parallel mechanisms to promote more widespread industrial applications and to develop the potential capabilities of such linkages.

TL;DR: In this paper, a conjoint analysis of the efficiency and transmission ratio ranges that can be achieved with all the possible constructive solutions of four-, five-, and six-link planetary gear trains is presented.

TL;DR: In this article, a combined finite element and surface integral contact analysis model is employed to investigate load distribution along the spline interfaces and the effect of spline misalignment along with intentional lead crowning of the contacting surfaces.