Showing papers in "Mechanism and Machine Theory in 1985"

TL;DR: In this article, a fully computerized method for structural synthesis of geared kinematic chains is presented, which can be used to derive epicyclic gear drives, and the results obtained there are presented and discussed.

TL;DR: In this article, a system of classification of planar four-bar mechanisms is presented in which the three major categories are Grashof, non-Grashof and change point.

TL;DR: This paper focuses on the Lagrangian formulation which is attractive from both the dynamic modeling and control engineering points-of-view and the application of control the positioning arm and artificial intelligence and intelligent sensors to control the end-effector.

TL;DR: A systematic procedure for type synthesis, suitable for computer implementation, is introduced and the large body of literature pertaining to type synthesis is discussed in the context of the proposed procedure.

TL;DR: In this paper, a conceptual framework for simplifying and reducing the nonlinear kinematic and dynamic coupling of robot dynamics is proposed to illustrate the properties and structural characteristics of industrial robots.

TL;DR: In this article, Tsai et al. presented a method for 3R, 4R, 5R, 6R and 6R industrial robots for a given set of design conditions involving full description of the accessible region and a type of robot, the method is illustrated by an example of a synthesis of 6R robots.

TL;DR: In this paper, the deflections associated with contact elasticity in a dry journal bearing were found to be much greater and less linear than predicted under static loads, and under a suddenly reversed uniaxial load the air film was found to cause a dramatic change of behaviour at reduced clearances.

TL;DR: Song et al. as mentioned in this paper designed a four-bar leg with a view to good energy efficiency, which was modified into a seven-bar legged leg by mounting another fourbar linkage on the coupler of the original 4-bar linkage and a different type of leg linkage based on pantograph mechanism was designed.

TL;DR: In this article, the authors provide a systematic method for the creation of all possible wheel damping mechanisms based on a parent mechanism, where the original mechanism is generalized into a linkage type kinematic chain according to the rules defined.

TL;DR: In this paper, a general method for describing external involute spur gears produced from the basic rack form is presented, which is a computer graphic drawing of the cut tooth as an individual tooth, several teeth in a segment or a complete gear.

TL;DR: In this article, the contribution of quasi-static deformation to the total deviation of the tracer point of a flexible path generator linkage from the desired path was reduced to zero by replacing one of the normally fixed ground link pivots by a sliding joint whose motion is controlled by a microprocessor.

TL;DR: A new method for optimum synthesis of planar mechanisms with lower pairs that uses a single objective function for any mechanism and for any type of synthesis, making it possible to perform even mixed syntheses.

TL;DR: This special issue on computer-aided design of mechanisms has the objective of representing the state-of-the-art in computer-assisted mechanism analysis and synthesis.

TL;DR: In this article, a vehicle model is developed employing a detailed nonlinear kinematic representation of a MacPherson strut front independent automotive suspension with a rack and pinion steering system.

TL;DR: In this paper, nonlinear programming techniques are applied to a class of six-bar linkages to produce single and multiple-dwell mechanisms, where the dwell position(s) may be specified at any value of input link rotation and may last for any reasonable duration.

TL;DR: In this article, the design, motion and force transmission characteristics of a non-traditional robot structure, the pantograph mechanism, were investigated, and the kinematic linearity and dynamic nonlinearity between inputs and outputs were investigated.

TL;DR: In this article, the authors propose a pre-view approach to force control based on predictive calculation of the contact forces that develop at the interface between mating parts, which is more efficient than the standard methods that rely on data from force sensors.

TL;DR: In this paper, a variational theorem is developed for the dynamic analysis of robots fabricated in viscoelastic composites. And a preliminary comparative study is performed for manipulators manufactured in a graphite-epoxy composite material and also steel in order to demonstrate some of the advantages to be accrued from this proposed new design philosophy.

TL;DR: In this paper, the effect of manufacturing tolerances on the performance of constrained kinematic chains is analyzed using probability theory using examples of path generating mechanisms to determine the mean and standard deviation of the vector position of a coupler point.

TL;DR: In this paper, the effect of rotatory inertia of elements and end masses of moving links on the elastic response of a planar four-bar mechanism is investigated by using the concept of kinematic influence coefficients.

TL;DR: In this paper, the authors derived general conditions of complete crank rotation for RSSR and RSSP four-bar mechanisms, which are expressed as inequalities which must be satisfied by the coefficients of a quartic equation, with the tangent of the output halfangle as the unknown.

TL;DR: In this article, the dynamic performance of a toggle mechanism is investigated and it is shown that there is an optimum impulse speed almost equal to a defined version of the quasi-natural frequency of the system which can minimize the energy loss.

TL;DR: In this paper, the Bobilliersche Konstruktion zeigt zwei mogliche Losungen zur bestimmung der Lage des Momentanpoles der unbekannten Polbahnen, falls die Lage der folgenden Punkte auf einem Polstrahl gegeben sind: der bewegten Ebene, der eine Kurve in der Bezugsebene beschreibt; der konjugierte Krummungsmittelpunkt

TL;DR: In this article, an RSSR-SRR spatial mechanism for motion generation with prescribed crank rotations is proposed. But the mechanism is not suitable for the RRS dyad.

TL;DR: In this article, a methode permettant de determiner le domaine d'existence des deplacements angulaires de toutes les liaisons d'un mecanisme a quatre barres.

TL;DR: The basis for a new method of type synthesis of spatial mechanisms with the use of single-loop structural groups having zero degrees of freedom is described, which can be programmed for digital computation and applied towards the automatic type synthesis in the design of spatial mechanism.

TL;DR: Possible mechanism defects and errors that may be encountered during the selective precision synthesis of planar mechanisms are discussed in detail and suitable remedial measures recommended.

TL;DR: Key features of a new computer-aided mechanism design system are effective graphical input, a common synthesis-analysis database and realistic automatic modelling and animation output for rapid evaluation of results.