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Systems and methods for modifying a modal oscillation in connection with a turbine
Systems and methods for modifying a modal oscillation in connection with a turbine
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机译：用于改变与涡轮机有关的模态振荡的系统和方法
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摘要
Jacket arrangements are described (214) and a method (1100) for changing at least a modal oscillation frequency of an inner shell (700) of an overcoat device (214) in a turbine (100). A shroud (214) has an inner jacket (700) and an outer jacket (304) on. The inner jacket (700) comprises a body (702) with a first end portion (708), a the first end portion opposite second end portion (710), an upper surface (704) and a lower surface (706), wherein the lower surface adjacent to a number of rotating turbine blades (204) is arranged. The inner jacket (700) further contains at least two strips (712a, 712b). A method (1100) to prevent an undesirable modal excitations in the inner shell (700) uses at least two strips (712a, 712b) ") which, on the upper surface (704) and extending between the first end portion (708) and the second end portion (710), between the at least two strips (712a, 712b) an impact cooling surface (716) is defined. In addition, the inner shell (700) at least one transverse strut (718) which, on the upper surface (704) and is formed in a direction which extends transversely to the at least two strips (712a, 712b) runs.
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