In this paper, a novel design of a biomimetic robot fish is presented. Based on the propulsion and maneuvering mechanisms of real fishes, a tail mechanical structure with cams and connecting rods for fitting carangiform fish body wave is designed, which provides the main propulsion. Two pectoral fins are mounted, and each pectoral fin can flap separately and rotate freely. Coordinating the move...

Thyroid hormone (TH) is a universal regulator of growth, development and metabolism during cold exposure in mammals. In zebrafish (Danio rerio), TH regulates locomotor performance and metabolism during cold acclimation. The influence of TH on locomotor performance may be via its effect on metabolism or, as has been shown in mammals, by modulating muscle phenotypes. Our aim was to determine whet...

1 Chandrashekhar Thorbole , Wichita State University ,Mechanical Engineering,[email protected]. 2 Behnam Bahr, Wichita State University, Mechanical Engineering , [email protected]. Abstract-This paper discuss about the procedure adapted to mimic the fish tail kinematics to develop a microprocessor controlled biomimetic robot, after review of different Fish swimming modes and understanding t...

The decisions animals make about how long to wait between activities can determine the success of diverse behaviours such as foraging, group formation or risk avoidance. Remarkably, for diverse animal species, including humans, spontaneous patterns of waiting times show random 'burstiness' that appears scale-invariant across a broad set of scales. However, a general theory linking this phenomen...

The adult morphology of the tail varies greatly among extant fishes despite sharing both ontogenetic similarities and the functional need to propel the body through a fluid medium. Both sharks (Chondrichthyes) and ray-finned fishes (Actinopterygii) control caudal fin musculature independently of axial body myomere activity to modify the stiffness and shape of their tails. For example, sharks an...

The main objective of this paper is to perform a risk analysis for the key commercial fish species in FAO area 27 by means bundle financial left-tail indicators, including Value-at-Risk (VaR), Expected Shortfall (ES) and Expectiles (EX), panel data catches (Q it ) measure (LTR i ); an empirical probabilistic worst-case reduction resulting from huge negative shocks. LTR can be useful, not only c...

Abstract In order to study the influence of deformations nozzle’s flexible sections on its inner wall’s heat transfer, this research uses two-dimensional axisymmetric model and k − ω SST turbulence numerically analyze tail flow field flexible-extendible nozzle under multiple working conditions. The transfer with without are simulated analyzed. simulation results show that when deformed, new sho...

This paper presents a novel dynamic model of a bio-inspired robotic fish underwater vehicle by unifying conventional rigid body dynamics and bio-fluid-dynamics of a carangiform fish swimming given by Lighthill’s (LH) slender body theory. It proposes an inclusive mathematical design for better control and energy efficient path travel for the robotic fish. The system is modeled as an 2-link robot...