Showing papers in "Mechanism and Machine Theory in 2013"

TL;DR: In this paper, a general analytical mesh stiffness model is proposed to include the effect of the gear tooth errors, which is suitable for not only the gear pairs with low contact ratio (LCR), but also the gear pair with high contact ratio(HCR).

TL;DR: In this article, an advanced model for the analysis of contact forces and deformations in spur gear transmissions is presented, where the deformation at each gear contact point is formulated as a combination of a global and a local term.

TL;DR: A new rolling bearing fault diagnosis approach based on LCD and FuzzyEn based on local characteristic-scale decomposition is proposed and results show that the proposed method performs effectively for the rolling Bearing fault diagnosis.

TL;DR: In this paper, a linear, time-invariant model of a double-helical planetary gear set is proposed, which allows the analysis of a gear set with any number of planets, any planet phasing and spacing configurations and any support conditions.

TL;DR: In this article, the authors considered dimensional synthesis of a six-bar linkage with turning kinematic pairs, in the literature known as Stephenson III Sixbar linkage, and the synthesis procedure started from the requirement that it should be a double dwell mechanism and that the coupler point, during dwell, should pass through the given points belonging to the circular arc.

TL;DR: In this paper, an analytical model is proposed to capture the excitation from tooth profile modifications at the sun-planet and ring-planet meshes, and the perturbation solution is used to investigate the effects of tooth profile modification.

TL;DR: In this article, the authors provide a comprehensive set of experimental data consisting of both dynamic stress factor and dynamic transmission error values collected simultaneously from the same gears to complement these earlier theoretical studies in terms of the relationship between durability and noise metrics.

TL;DR: An optimization problem for the 3-degrees-of-freedom RRR fully planar parallel manipulator based on the actuator power consumption is presented and the optimization results for the eight working modes of 3-RRR are compared to each other and given in tables.

TL;DR: In this paper, the authors incorporated eccentricity errors into a planetary gear lumped parameter model, in which deflections, errors and gear geometry are coupled, leading to initial separations between tooth flanks and inertial excitations caused by unsteady rotational speeds.

TL;DR: A calculation procedure for a “Pareto optimization” of Input Coupled and Output Coupled transmissions has been implemented on MATLAB and AMESim platforms, in which the research of the optimum solution is carried out using the algorithm of the Multi-Objective Particle Swarm Optimizer.

TL;DR: In this paper, a novel prism deployable mechanism is proposed based on polyhedral linkages, which possesses half-closed polyhedron characteristics and the mobility of this mechanism is studied by screw theory and the singularity of mechanism is investigated.

TL;DR: In this article, a cable-driven manipulator with the ability to significantly regulate its stiffness through tension resolution is introduced, where a variable stiffness device is attached along each driving cable, in which the stiffness of the device is a function of the cable tension.

TL;DR: For every generic rational curve C in the group of Euclidean displacements C, a linkage is constructed such that the constrained motion of one of the links is exactly C.

TL;DR: Based on the theory of envelope, a geometric method is employed to uniformly construct the indeterminate influences of these two error sources on the pose (position and orientation) deviation of the manipulators.

TL;DR: In this paper, the authors present a methodology to restore the designed functional properties of hypoid gear sets whose teeth deviate from their theoretical models due to inevitable imperfections in the machining process.

TL;DR: In this article, the nonlinear forced vibrations and stability of an axially moving Timoshenko beam with an intra-span spring-support are investigated numerically, and three coupled nonlinear partial differential equations of motion are obtained using Hamilton's principle along with stress-strain relations.

TL;DR: In this paper, the influence of engine torque harmonics, model degrees of freedom, and dual mass flywheels on the transient response of a vehicle powertrain equipped with a dual-clutch transmission has been investigated.

TL;DR: In this article, the effect of the support type (fixed support and pin support), ring thickness and number of supports on the mesh stiffness of a planetary gear pair was investigated, and it was shown that the ring stiffness appears to be periodic with the number of the periodicities exactly equal to the size of the supports.

TL;DR: In this paper, the authors designed and implemented a novel omnidirectional spherical robot, where instead of using wheels or flywheels, a driven ball is installed inside the spherical shell and driven by two orthogonally mounted rollers.

TL;DR: In this paper, a contact element for global dynamic simulations of gear assemblies using multibody modeling that enables to take into account real-case parameters in a scalable way is discussed for the purpose of gear whine simulation.

TL;DR: In this article, a discrete-time sliding mode control (DSMC) algorithm based on a proportional-integral-derivative (PID) type of sliding function is devised.

TL;DR: In this article, the authors proposed a type of functional joint mechanism with constant torque outputs, which passively maintains a constant torque over a specific rotation interval, instead of using sensorized control.

TL;DR: In this article, a novel robotic platform (ROPE RIDE: RObotic Platform Enabling Rope access in Dangerous Environment) is presented to efficiently climb up various types of walls with the help of a rope ascender.

TL;DR: In this article, a dynamic model of a rotor supported on ball bearings with floating-ring squeeze film dampers (FSFD) is established, where the coupling effect between rotor, ball bearing and FSFD is considered.

TL;DR: An original elasto-geometrical calibration method to improve the static pose accuracy of industrial robots involved in machining, forming or assembly applications is proposed and the efficiency of the fuzzy logic model while minimizing development and computational resources is shown.

TL;DR: A normalization-based approach to the mobility analysis of spatial compliant multi-beam modules to address the dimensional-inhomogeneity issue of motion/load and the DOF of these compliant modules can be identified more easily using the proposed approach than the approach without normalization.

TL;DR: In this article, the authors proposed a spring assistive spatial mobile arm support (MAS), which comprises two ideal zero-free-length springs directly installed to the arm mechanism without using any auxiliary link.

TL;DR: This paper presents an approach for the optimal design of a 2-DOF translational pick-and-place parallel robot by taking account of the normalized inertial and centrifugal/Coriolis torques of a single actuated joint.

TL;DR: In this paper, the authors provided an analytical proof of the optimal tuning of CPVAs to reduce in-plane translational and rotational vibration for a rotor with N cyclically symmetric substructures attached to it.

TL;DR: In this paper, the effect of cable sagging on the analysis of a spatial parallel three-degree-of-freedom suspended cable-driven mechanism is assessed and the stiffness of the mechanism is evaluated throughout the workspace by mapping intuitive stiffness indices that are extracted from the stiffness matrix.