TAILIEUCHUNG - Rotating machinery vibration_2

Tham khảo sách 'rotating machinery vibration_2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 5 Bearing and Seal Rotor Dynamics 1. INTRODUCTION RD A the modern finite-element-based PC code supplied with this book is presented from a fundamentals perspective in Chapter 2 and from a user s perspective in Chapter 4. There are a number of commercially available codes with similar capabilities. Rotor dynamic analysis codes in particular and engineering analysis codes in general nearly always have one tacit fundamental trait in common. That trait is as follows. Those aspects of the problem class that are reasonably well defined and modeled by first principles are inside the computer code. Those aspects that are not as well defined and modeled by first principles show up as some of the inputs to the computer code. With this approach the typical computer code developer and marketer has long been quick to tout their code as capable of handling any conceivable problem within the code s intended range of usage as long as one has all the correct inputs. For lateral rotor vibration LRV analyses those important inputs that present the biggest challenge are the dynamic properties . stiffness damping and inertia coefficients for the components that dynamically connect the rotor to the stator stator everything that does not rotate . These components include first and foremost the radial bearings. In many rotating machinery types . turbomachinery other liquid- and gas-filled internal close-clearance annular gaps such as in seals are also of considerable LRV importance. Furthermore the confined liquid or gas that surrounds a rotor component . centrifugal pump impeller and balancing drum may also significantly contribute to the basic vibration characteristics of a rotating machine in an interactive way much like bearings and seals and or as explicit time-dependent unsteady-flow forces . hydraulic in 149 150 Chapter 5 stability in centrifugal pumps rotating stall in turbocompressors . Electromagnetic forces may also contribute. Most modern LRV research has been .

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