TAILIEUCHUNG - POWER PLANT ACOUSTICS Episode 5

Tham khảo tài liệu 'power plant acoustics episode 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | TM 5 805 9 AFM 88-20 NAVFAC 3 Where steel springs are used unhoused stable steel springs are preferred. If housed or enclosed springs must be used special attention must be given to the alignment of the mounts so that they do not tilt or bind in any direction within their housings. Further there should be some visual means to check the spring mount in its final location to be certain that binding or tilting does not take place. e. Special situations. The recommendations given in paragraph 3-6 will provide adequate coverage for most typical equipment installations. However general rules cannot cover all marginal and complex variations. For unusual installations or unfamiliar conditions it is advisable to have the assistance of a vibration or acoustical consultant experienced with this equipment. Vibration problems are sometimes quite complex and unpredictable. 3-7. Vibration isolation of turbine engines. Typically the smaller gas turbine enginegenerator sets under about 5 MW are mounted transported and installed as complete assemblies on steel-frame skid-like structures and the large gas turbine systems over about 5 MW are installed at the site on long stiff steel-beam bases which in turn rest on concrete footings or concrete mats The turbine speeds are very high typically 3600 to 6000 rpm some up to 25 000 rpm and the alignment of turbine gear and generator is critical. The absence of rotary unbalance at these speeds is mandatory hence there is little or no vibration compared to the vibration of a reciprocating engine. The steel beams of the large turbine engine assemblies require their concrete footings for additional longitudinal stiffness and system alignment so steel springs are not recommended as point supports along the steel beams unless the manufacturer specifically proposes such mounts for critical installations. Instead it is suggested that the engines be separated from any critical areas by adequate distance. Distance requirements set by the .

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