The design of a four-bar mechanism to generate prescribed path with minimal error is possible by using the maximum number parameters that are effective in synthesis mechanism. In this study, mechanisms, which intersect given curve at nine points, was dealt two stages. first step, kinematic equations were used implement preliminary based on five and closed-form solving. Thus, all solution values...

We identified the four most significant features in the UV velocity distribution of solar neighborhood stars: H1, H2 and W1, W2 in the Hercules and Wolf 630 streams, respectively. We set the task of determining a number of characteristics of the central Galactic bar independently by analyzing each of the identified features under the assumption that the Hercules and Wolf 630 streams have a bar-...

this paper presents the results of a recent project of ikco’s research center to modify paykan 1600’s rear suspension mechanism with the purpose of improving comfort, stability and handling qualities. the car was originally equipped with a solid rear axle with leaf springs. by replacing the original mechanism with a three-link mechanism with panhard bar and coil springs, the ride comfort and ha...

Currently, rehabilitation systems with closed kinematic chain mechanisms are low-cost alternatives for treatment and health care. In designing these systems, the dimensional synthesis is commonly stated as a constrained optimization problem to achieve repetitive movements, metaheuristic algorithms problems promising methods searching solutions in complex search space. The Constraint Handling Te...

magnification of four-bar mechanisms. The handout outlined a technique for performing such analyses using principles of energy conservation, geometry, and algebra. The technique is called ‘instant-center analysis’ and is based on a concept called ‘virtual work.’ The handout also contained an example analysis for a four-bar mechanism of a similar type to a toggle clamp. For years, computers have...

Mantis shrimp (Stomatopoda) generate extremely rapid and forceful predatory strikes through a suite of structural modifications of their raptorial appendages. Here we examine the key morphological and kinematic components of the raptorial strike that amplify the power output of the underlying muscle contractions. Morphological analyses of joint mechanics are integrated with CT scans of minerali...