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Applied Mechanics, Volume 1, Issue 2

2020 June - 4 articles

Cover Story: Mechanical clocks built in Europe starting from the end of the 13th century employed the “verge and foliot escapement” mechanism with a relatively low accuracy of time measurement. The introduction of the pendulum into the clock mechanism by Christiaan Huygens in 1658–1673 improved accuracy by about 30 times. The improvement is attributed to the isochronicity of small linear vibrations of a mathematical pendulum. We developed a mathematical model of both mechanisms. Using scaling arguments, we show that the introduction of the pendulum resulted in accuracy improvement by approximately π/μ ≈ 30 times, where μ ≈ 0.1 is the coefficient of friction. View this paper

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Article

12 Citations

6,941 Views

11 Pages

Damage Evaluation of Free-Free Beam Based on Vibration Testing

Duong Huong Nguyen,
Long Viet Ho,
Thanh Bui-Tien,
Guido De Roeck and
Magd Abdel Wahab

Appl. Mech.2020, 1(2), 142-152;https://doi.org/10.3390/applmech1020010

9 May 2020

Damage can be detected by vibration responses of a structure. Damage changes the modal properties such as natural frequencies, mode shapes, and damping ratios. Natural frequency is one of the most frequently used damage indicators. In this paper, the...

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Feature Paper
Article

5 Citations

10,125 Views

12 Pages

Friction and Dynamics of Verge and Foliot: How the Invention of the Pendulum Made Clocks Much More Accurate

Aaron S. Blumenthal and
Michael Nosonovsky

Appl. Mech.2020, 1(2), 111-122;https://doi.org/10.3390/applmech1020008

29 April 2020

The tower clocks designed and built in Europe starting from the end of the 13th century employed the “verge and foliot escapement” mechanism. This mechanism provided a relatively low accuracy of time measurement. The introduction of the pendulum into...

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Article

5 Citations

7,913 Views

19 Pages

The Limitations on the Use of the IMO CSS Code in Project Cargo—Case Study: Grillage Design for the Sea Transport of Gas Slug Catchers

José Manuel Pérez-Canosa,
Santiago Iglesias-Baniela and
Alsira Salgado-Don

Appl. Mech.2020, 1(2), 123-141;https://doi.org/10.3390/applmech1020009

29 April 2020

Heavy cargo units with a relatively reduced footprint area require a support surface large enough to transfer the forces onto the largest possible surface and/or the main stiffening (longitudinal and transverse) in order to not collapse or overstress...

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Article

49 Citations

10,714 Views

14 Pages

Springback Prediction in Sheet Metal Forming, Based on Finite Element Analysis and Artificial Neural Network Approach

Stefanos C. Spathopoulos and
Georgios E. Stavroulakis

Appl. Mech.2020, 1(2), 97-110;https://doi.org/10.3390/applmech1020007

6 April 2020

Sheet metal forming is one of the most important manufacturing processes applied in many industrial sectors, with the most prevalent being the automotive and aerospace industries. The main purpose of that operation is to produce a desired formed shap...

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