A Specific Problem of Mechanism Synthesis

Buśkiewicz, Jacek

doi:10.2478/ijame-2014-0034

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…Two triangles with the limitations of the transmission angle can be solved using the sine rule [20], (Fig. 2), as follows:…”

Section: Design Techniques For Choosing Transmission Angle Rangesmentioning

confidence: 99%

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Improving the Dynamic Performance of the Crank-Rocker Mechanism Using Composite Links

El-Elamy

2023

ERJ. Engineering Research Journal

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In practice, the transmission angle is a crucial factor for reducing the required driving power and improving the dynamic performance of the mechanisms and machines. The vibration of elastic links is unavoidable in mechanisms running at high speeds. Thus, optimum link lengths decrease driving power since they ensure optimal transmission angles. In addition, joints made of hybrid and nonhybrid composites are lightweight and require less driving torque. Additionally, composite links can be used in place of metal links to alleviate wear and corrosion issues. Through the use of composite links, the dynamic performance of the mechanism and the machine will be improved as a result of the higher damping factor, stiffness, and flexural modulus values of the composite materials. Accordingly, this research considers the effect of transmission angle, four case types of linkages proportions, and stacking sequences on the natural frequencies and instability thresholds of the mechanisms. Therefore, the finite element method (FEM) was used to efficiently compute the Eigen-nature for the mechanisms with composite links. The experimental tests are also conducted using the frequency response function method (FRF). Based on the results, the CR mechanism performs best at 90° of the transmission angle, as the average natural frequency of this angle decreases by 11.19 % and 26.17 % compared to the maximum and minimum transmission angles. Overall, the measuring and theoretical fundamental response frequencies of mechanisms are in good agreement.

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“…Two triangles with the limitations of the transmission angle can be solved using the sine rule [20], (Fig. 2), as follows:…”

Section: Design Techniques For Choosing Transmission Angle Rangesmentioning

confidence: 99%

“…Likewise, other reports have adopted the same mini-max sense, such as [18,19]. Furthermore, definite transmission angle ranges as 35-145 ° and 30-150 ° are recommended in [20].…”

Section: Introductionmentioning

confidence: 99%

Improving the Dynamic Performance of the Crank-Rocker Mechanism Using Composite Links

El-Elamy

2023

ERJ. Engineering Research Journal

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“…In order to achieve the structure capable of generating the chosen reference ICR trajectory the mechanism elements' dimensions of the four-bar mechanism were optimized. The optimization of the fourbar linkage design for a specific path was described in (Buśkiewicz [20]) by means of evolutionary algorithm. However, in this paper an optimization was started using the SAM ARTAS -Engineering Software with the initial dimensions of the crossed four-bar mechanism from the device Kincom (Kim et al [11]).…”

Section: Topology Search and Design Optimizationmentioning

confidence: 99%

Design and Characterization of a Novel Knee Articulation Mechanism

Olinski¹,

Gronowicz²,

Handke³

et al. 2016

International Journal of Applied Mechanics and Engineering

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The paper is focused on designing a novel controllable and adjustable mechanism for reproducing human knee joint's complex motion by taking into account the flexion/extension movement in the sagittal plane, in combination with roll and slide. Main requirements for a knee rehabilitation supporting device are specified by researching the knee's anatomy and already existing mechanisms. A three degree of freedom (3 DOF) system (four-bar like linkage with controlled variable lengths of rockers) is synthesised to perform the reference path of instantaneous centre of rotation (ICR). Finally, a preliminary design of the adaptive mechanism is elaborated and a numerical model is built in Adams. Numerical results are derived from simulations that are presented to evaluate the accuracy of the reproduced movement and the mechanism's capabilities.

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