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00:00:00 – 00:10:41
The video discusses the importance of utilizing diagrams such as the Campbell diagram and Goodman diagram for analyzing machine frequencies to prevent damage. It emphasizes the significance of assessing natural frequencies, nodal diameters, and stress levels to ensure machine safety. Understanding the relationship between design speed, maximum continuous speed (MCS), and interference frequencies is crucial. The video stresses the need to consider operating within safe speed ranges, implementing Duell zones when necessary, and utilizing Control System Programs for shutdown in case of prolonged operation in risky zones. Proper analysis of diagrams and logic is essential for maintaining machine integrity and preventing failure.
00:00:00
In this segment of the video, the importance of the Campbell diagram for disk frequency analysis is highlighted. The diagram helps analyze natural frequency in relation to exciting frequency to prevent machine damage. A Campbell diagram is acceptable when there is no interference between exciting and natural frequencies up to the operating speed. Goodman diagram is used when alternating stress is within certain limits, and the “no do zone” is to avoid running at points of interference or resonance. The machine should be shut down if running in the no do zone for too long. These diagrams and criteria are crucial for machine protection and analysis.
00:03:00
In this segment of the video, the speaker discusses how to generate a Campbell diagram to understand machine speed and frequency relationships. They explain the difference between design speed and maximum continuous speed (MCS) and emphasize that machines can safely run up to MCS speed. Exciting force frequencies for a turbo expander are calculated using specific formulas. The speaker highlights the importance of considering interference up to MCS speed and mentions the need to draw both one-time and two-time gearbox (igb) and diffuser guide v (dgb) exciting frequencies for compressors driven by motors or steam turbines.
00:06:00
In this segment of the video, the speaker discusses natural frequency calculations and their relevance to machine safety. They explain how natural frequencies can be determined based on nodal diameters and blade frequencies. The Kemble diagram is introduced to assess the safety of operating the machine within certain speed ranges in relation to natural and exciting frequencies. The importance of Goodman diagrams in determining acceptable stress levels is emphasized; if stress levels exceed a limit, a Duell zone may be necessary for safety. The decision to implement a Duell zone depends on the stress conditions (alternating stress compared to ftic failure stress).
00:09:00
In this segment of the video, the speaker discusses the Goodman diagram and the importance of understanding the margin between below and higher points of intersection in machines to avoid failure. They mention that if a machine runs longer than preset allowable time, the Control System Program will shut it down to prevent damage. The video explains the need to consider natural frequencies and exciting frequencies for successful operation, and mentions analyzing the Goodman diagram and using node well Jone logic if necessary. Overall, the speaker emphasizes the importance of understanding machine operation using diagrams and logic to prevent damage.