Dynamics of rotating machines, also known as rotordynamics, is a specialized branch of applied mechanics concerned with the behaviour and diagnosis of rotating structures. Rotating machinery produces vibrations depending upon the structure of the mechanism involved in the process. Any faults in the machine can increase or excite the vibration signatures. Vibration behaviour of the machine due to imbalance is one of the main aspects of rotating machinery which must be studied in detail and considered while designing. All objects including rotating machinery exhibit natural frequency depending on the structure of the object. The critical speed of a rotating machine occurs when the rotational speed matches its natural frequency. The lowest speed at which the natural frequency is first encountered is called the first critical speed, but as the speed increases, additional critical speeds are seen which are the multiples of the natural frequency. Hence, minimizing rotational unbalance and unnecessary external forces are very important to reducing the overall forces which initiate resonance. When the vibration is in resonance, it creates a destructive energy which should be the main concern when designing a rotating machine.
This course provides the background and techniques that will allow successful analysis, design, modification, testing, and control of vibration in engineering rotating systems. A special focus is also paid on critical speeds, rotor balancing and vibration isolation.
- Titulaire: Georges KOUROUSSIS