Experimental research on wave force characteristics of permeable type wave absorbing structures.

In order to increase the structural stability of existing caisson breakwater, the design and the construction is carried out by installation of new caissons on the back or the front of old caissons. In this study, we use the ANSYS AQWA program to analyze the wave forces acting on individual caisson according to effects of wave structure interaction when new caissons are additionally installed on existing caisson breakwater. Firstly, the wave force characteristics acting on the individual caisson were analyzed for each period (frequency) in the frequency domain. In time domain analysis, the dynamic wave force characteristics were strongly influenced by the distance between caissons on the frequency at which the unusual distribution of wave forces occurs.

Download Full-text

Experimental Research on Dynamic Characteristics of a Rolling Agricultural Tire: Measurement of Forces Acting on Tire Shaft

Volume 4B: Dynamics, Vibration, and Control ◽

10.1115/imece2014-36451 ◽

2014 ◽

Author(s):

Katsuhide Fujita ◽

Takashi Saito ◽

Mitsugu Kaneko

Keyword(s):

Experimental Research ◽

Vibration Characteristics ◽

Rigid Ring ◽

Ring Model ◽

Natural Modes ◽

Force Transducers ◽

Excitation Force ◽

Force Characteristics ◽

Component Force ◽

Agricultural Machines

When agricultural machines are operated on pavements, the lug excitation force occurring on a rolling agricultural tire is primary cause of the vibration. Therefore, it is important to investigate the lug excitation force in order to clarify the vibration generation mechanism. In our previous study, it is considered that the dynamic behavior of a rolling agricultural tire is influenced by the vibration characteristics of the tire. Further, only the rigid modes among the natural modes could affect the rolling tire behavior. So, we modeled the tire as a circular rigid ring supported on an elastic foundation with contact model. This rigid ring model can be valid to investigate the lug excitation force, while it is necessary to measure forces acting on tire shaft in order to estimate the lug excitation force. In this study, the test equipment is modified to measure tire shaft forces at rolling, by improved supporting structure equipped with 6-component force transducers and the shaft force characteristics are investigated. It is confirmed that the vibration characteristics of the tire influence the shaft force characteristics.

Download Full-text

Numerical investigation on the wave force characteristics of multi-cylinder with equilateral-triangular arrangement

Ocean Engineering ◽

10.1016/j.oceaneng.2021.110245 ◽

2022 ◽

Vol 243 ◽

pp. 110245

Author(s):

Zhihao Zhang ◽

Jiahuang Tu ◽

Lei Wu ◽

Yongkang He ◽

Haojie Ren ◽

...

Keyword(s):

Numerical Investigation ◽

Wave Force ◽

Force Characteristics

Download Full-text

Wave Force Characteristics and Stability of Detached Breakwaters Consisting of Open Cell Caissons Interlocked via Crushed Stones

Water ◽

10.3390/w12102873 ◽

2020 ◽

Vol 12 (10) ◽

pp. 2873

Author(s):

Byeong Wook Lee ◽

Jae-Sang Jung ◽

Woo-Sun Park ◽

Jae-Seon Yoon

Keyword(s):

Structural Stability ◽

Analytical Solutions ◽

Incident Angle ◽

Frictional Resistance ◽

Wave Theory ◽

Wave Force ◽

Linear Wave ◽

Open Cell ◽

Wave Basin ◽

Force Characteristics

The maximum external force acting on a long continuous harbor structure can be reduced by controlling the phase difference of forces acting longitudinally. This strategy can be used to increase the structural stability of breakwaters consisting of caissons. Breakwaters have been developed using interlocking caissons to effectively respond to the constant increase in wave height due to climate change. In this study, we investigated the wave force characteristics and stability of a detached breakwater consisting of open cell caissons interlocked via crushed stones. We performed wave basin experiments and compared the results with analytical solutions of linear diffraction waves. The results revealed that the maximum wave force acting on the front of the breakwater decreased as the incident angle increased, reducing by as much as 79% for an incident angle of 30°. Although the variability of the maximum wave force for each caisson is large owing to the influence of the diffracted waves, the maximum wave force acting on the entire detached breakwater was not significantly affected by this variability. The analytical solutions based on linear wave theory agreed with the experimental results, indicating that the findings can be applied to actual designs. The structural stability of the breakwater was enhanced, even for low incident wave angles, compared to that of a single integral structure, as the frictional resistance produced by the sliding structure increased due to the shear resistance between the filled crushed stones and the rubble mound.

Download Full-text

Experimental Research on Calculating Wave Force through Wave Pressure Measurement

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.317-319.2293 ◽

2011 ◽

Vol 317-319 ◽

pp. 2293-2296

Author(s):

Jian Min Chen ◽

Peng Zeng Guo ◽

Xin Jiang ◽

Zhi Hui Liu

Keyword(s):

Comparative Analysis ◽

Applied Stress ◽

Experimental Research ◽

Pressure Measurement ◽

Wave Force ◽

Regular Pattern ◽

Wave Pressure ◽

Plate Structure ◽

Stress Diagram ◽

Sea Wave

This article records the measuring of applied force exerted on plate structure by sea wave only, and observation of the regular pattern of the stress under stimulated conditions of ocean in the lab. And calculating of the applied stress on plate structure through MATLAB then integrating of the stress diagram using wave pressure formula, as well as comparative analysis of the two groups of data using selected wave theories.

Download Full-text