Turbine engine exhaust duct system and methods for noise dampening and attenuation

1. An exhaust attenuation assembly to receive exhaust gas from a gas turbine attached to a trailer, the exhaust attenuation assembly to attach to a portion of the trailer and comprising:

a lower elongated plenum having a proximal end and a distal end, the lower elongated plenum extending a first distance between the proximal end and the distal end, and having an inlet positioned adjacent the proximal end to receive exhaust gas from the gas turbine; and

an upper noise attenuation system movably connected relative to the distal end of the lower elongated plenum, the upper noise attenuation system being selectively movable between a stowed position, in which an outlet end of the upper noise attenuation system is positioned proximate the distal end of the lower elongated plenum, and an operative position, in which the upper noise attenuation system defines an upper elongated plenum in fluid communication with the distal end of the lower elongated plenum and in which the outlet end of the upper elongated plenum is spaced away from the distal end of the lower elongated plenum at a second distance that is greater than the first distance, the upper noise attenuation system further comprising an elongated conduit configured for complementary receipt in relation to the lower elongated plenum, a rod having a first end connected to a surface of the elongated conduit at the outlet end, a guide configured for operative slideable receipt of the rod, and a second end of the rod connected to one or more:

(a) sheaves, or

(b) pulleys

configured for movement of the elongated conduit between the stowed position and the operative position.

2. The exhaust attenuation assembly of claim 1 , wherein a top portion of the elongated conduit comprises at least one array of baffles that extend horizontally in the top portion of the elongated conduit, the array of baffled configured to attenuate noise.

3. The exhaust attenuation assembly of claim 1 , further comprising a first plenum configured to receive exhaust gas from the gas turbine, a first end of the first plenum configured to be connected to an exhaust outlet of the gas turbine and a second end of the first plenum connected to the inlet of the lower elongated plenum.

4. The exhaust attenuation assembly of claim 3 , wherein the first plenum is configured to be connected to the trailer to extend longitudinally substantially parallel to a bottom surface of the trailer.

5. The exhaust attenuation assembly of claim 1 , wherein the lower elongated plenum is configured to extend longitudinally away from a bottom surface of the trailer about an exhaust axis.

6. The exhaust attenuation assembly of claim 5 , wherein the upper noise attenuation system, in the operative position, extends longitudinally away from the distal end of the lower elongated plenum about the exhaust axis.

7. The exhaust attenuation assembly of claim 6 , wherein the exhaust axis is substantially perpendicular relative to the bottom surface of the trailer.

8. The exhaust attenuation assembly of claim 1 , wherein the upper noise attenuation system further comprises at least one array of baffles configured to attenuate noise.

9. The exhaust attenuation assembly of claim 8 , wherein the array of baffles comprises a plurality of baffles distributed parallel to a common axis and that define a plurality of slots defined by and between the plurality of baffles.

10. The exhaust attenuation assembly of claim 9 , wherein the at least one array of baffles is mounted in a portion of the upper elongated plenum for communication with the exhaust gas passing through the upper elongated plenum to the outlet.