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22.10.2012 20:43:55
23.08.2011
03.11.2009
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6.3. Interaction four modular device with a flow of fluid.

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In this paper, the task to understand the mechanism of movement of the dolphins, so the study is completed with an array like array of sets of single work items included in the independent (independent) modules having the opportunity to perform classical flexural-torsional vibrations that make possible the emergence of oscillations in flutter-type back- the forward movement of the working elements perpendicular to the direction of motion of the fluid flow. Each vibrating working element needs to be influenced not only on the UAI of its own interaction with the flow of fluid in the swing in this thread, but the influence of the interaction of neighboring UAI oscillating in an array of objects with the same flow of fluid and with each other. 

Diagram of the device, which consists of 4 modules, is shown in FIG. 4 and FIG. 5. 

Designations of parts in the figures 4 and 5 is similar to the designation of parts in the figures 1 and 2. 
The kinematic relationship between the modules is carried out by means of transmission gears 10, located on the shaft 9 with the same or the opposite side with respect to stationary base 4. The phase shift between the modules installed with gear pinions 10. 
This scheme is preferable to the previously described scheme odnomodulnogo device as non-uniformity is reduced movement of the working element 1 (Figs. 1, 2) associated with a change in motion during the passage of the slide 5 "dead" pixels (position "B" and "D" in

Fig. 3.) Also increases the reliability and efficiency of the device in the interaction with the flow.Transmission gears and play a role of inertial mass. 

Uniform scheme of the vibrational movement of the working elements of a chetyrehmodulnogo device provides guaranteed mode self-excited oscillations of the "flutter" in the interaction with the air stream 2, is shown in Fig. 6. 

Designations: 
1 - a work item; 
2 - the flow of air; 
L - the phase angle between displacement and force; 
P - force exerted by the flow on the lateral surface of the working element, perpendicular to the reciprocating movement of the working element; 
Pn - normal component of the force exerted by the flow of P on the lateral surface of the work item, which coincides with the direction of the reciprocating movement of the working element; 
Pc - the resulting component of force P, perpendicular to the lateral surface of the working element; 
Puai - total UAI of unsteady aerodynamic forces and moments; 

A - initial time; 
1 / 1 (1) - position of the first work item in the initial time 
1 / 2 (1) - position of the second work item at the initial time 
(Phase shift relative to the first element 90 degrees); 
1 / 3 (1) - the position of the third working element at the initial time 
(Phase shift relative to the second element 90 degrees); 
1 / 4 (1) - the fourth position of the working element in the initial moment 
time (phase shift relative to the third element 90 degrees); 

In - phase shift of 90 degrees relative to the initial moment of time; 
1 / 1 (2) - position of the first work item with a phase shift of 90 degrees 
relative to the initial moment of time; 
1 / 2 (2) - position of the second work item 
(Phase shift relative to the first element 90 degrees); 
1 / 3 (2) - the position of the third working element 
(Phase shift relative to the second element 90 degrees); 
1 / 4 (2) - the fourth position of the working element 
time (phase shift relative to the third element 90 degrees); 

C - 180 degrees phase shift relative to the initial moment of time; 
1 / 1 (3) - position of the first work item with a phase shift 180 degrees 
relative to the initial moment of time; 
1 / 2 (3) - position of the second work item 
(Phase shift relative to the first element 90 degrees); 
1 / 3 (3) - position of the third working element 
(Phase shift relative to the second element 90 degrees); 
1 / 4 (3) - the fourth position of the working element 
time (phase shift relative to the third element 90 degrees); 

D - 270-degree phase shift relative to the initial moment of time; 
1 / 1 (4) - position of the first work item with a phase shift 270 degrees 
relative to the initial moment of time; 
1 / 2 (4) - position of the second work item 
(Phase shift relative to the first element 90 degrees); 
1 / 3 (4) - the position of the third working element 
(Phase shift relative to the second element 90 degrees); 
1 / 4 (4) - the fourth position of the working element 

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