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When varying the rotational speed of machinery stages may be encountered where vibrations become excessive?
Excessive vibrations in machinery can occur at specific rotational speeds known as resonant frequencies, where the system's natural frequency aligns with the operating frequency. At these stages, even small imbalances or misalignments can be amplified, leading to significant vibrations that may damage components and affect performance. Proper balancing, damping, and tuning of machinery can help mitigate these excessive vibrations and improve operational stability. Regular monitoring and maintenance are essential to identify and address these issues promptly.
What else can I help you with?
What measures the number of vibrations per minute?
The number of vibrations per minute is measured using a tool called a tachometer. This device measures the rotational speed of a rotating component, such as an engine or motor, by counting the number of vibrations or pulses per minute. Tachometers are commonly used in automotive, aerospace, and manufacturing industries to monitor and control the speed of machinery.
What is mean by Critical speed of the shaft?
Critical speed of a shaft refers to the rotational speed at which the system's natural frequency coincides with the shaft’s rotational frequency, leading to resonance. At this speed, vibrations can increase significantly, potentially causing mechanical failure or excessive wear. It's crucial in engineering to avoid operating machinery at or near this speed to ensure stability and longevity. Engineers often calculate critical speed to design shafts that operate safely and efficiently within specified limits.
What is anti vibration?
Anti-vibration refers to a technology or mechanism designed to reduce or eliminate vibrations in machinery, equipment, or structures. This can include using dampeners, isolators, or other materials to absorb or redirect the energy generated by vibrations, preventing damage or discomfort caused by excessive shaking or oscillations.
Why are damping devices used on machinery?
Damping is the resistance offered by a body when a system is in vibration. But the basic use of a damper(damping) is to help reduce the oscillations or vibrations.we can also conclude that we use damping to slow down the effect of a moving part.Damping controls the amplitude of vibrations just to avoid resonance conditions.
What is air borne vibrations?
Airborne vibrations are vibrations that travel through the air rather than through a solid medium like a floor or a wall. They are caused by sound waves and can be felt as vibrations in the air, typically due to loud noises or machinery.
What is critical rpm and super critical rpm?
Critical RPM (Revolutions Per Minute) refers to the speed at which a rotating system's natural frequency coincides with its rotational frequency, leading to resonance and potentially excessive vibrations. Supercritical RPM is the speed beyond the critical RPM where the system operates safely and stably, typically resulting in a reduction in vibration amplitudes as the frequency increases past the resonance point. In engineering, understanding these RPMs is crucial for designing machinery to avoid operational failures and ensure longevity.
How does dynamic balancing work?
Dynamic balancing involves calculating and offsetting the weight imbalances in rotating machinery by adding or removing weight to achieve a balanced state. This is done by mounting counterweights on the rotating part of the machinery to cancel out the vibrations caused by imbalances, ensuring smoother and more efficient operation. The goal is to minimize vibrations and maintain the machinery's performance and longevity.
State of varying the rotational speed of machinery?
Power output will increase. Beyond the critical speed, torsional failure may occur.
Is 17 working hours in 24 hours an excessive long workday around dangerous machinery with only 7 hours off time per 24 hour day?
Yes. It is an excessive long workday around dangerous machinery etc.
Why should excessive vibration not be allowed to continue in moving parts of machinery?
Unnecessary wear and stress will shorten the lifespan of the moving parts and machinery in general if vibration is allowed to continue.
State the forces causing vibration in a ship usually result from an imbalance in the machinery?
The main forces causing vibration in a ship are usually due to misalignment, mechanical looseness, and unbalance in the ship's machinery. These forces can create vibrations that not only affect the comfort of passengers and crew but can also lead to increased wear and tear on the ship's components. Regular maintenance and proper alignment of machinery can help reduce these vibrations.
What does the low speed shaft do?
The low-speed shaft is a component in wind turbines and other machinery that connects the rotor to the gearbox. Its primary function is to transmit mechanical energy generated by the rotor at low rotational speeds to the gearbox, which then increases the rotational speed for optimal energy conversion. This allows for efficient operation of the turbine or machinery, ensuring that the generated energy can be effectively harnessed and utilized.
