How do you fix resonance vibrations?
In practice, the following rules can be used to shift a natural frequency and minimize the vibration response of a system;
- Adding stiffness increases the natural frequency.
- Adding mass decreases the natural frequency.
- Increasing damping reduces the peak response but widens the response range.
How do you know if a resonance condition is correct?
We need to positively identify the natural frequency by performing at least two different tests such as impact test, coast down peak hold, coast down peak phase or impact test using a force hammer. Once the resonance is confirmed, either change the mass or the stiffness of the equipment to change its natural frequency.
Why should we avoid resonance?
There is an undesirable side effect of resonance. Resonance can cause a bridge, skyscrapers and towers to collapse. Even blades,piping and bearing can fail due to resonance. Therefore, resonance failures must be avoided.
How resonance vibrations can be a problem in machines and buildings?
Resonance occurs when a forcing function excites the machine’s natural frequency, causing an excess in vibration. These excessive vibrations cause additional stress on a machine, resulting in poor reliability, premature failure, and greater cost in maintenance and parts.
What is motor resonance?
Mechanical resonance occurs when an external source amplifies the vibration level of a mass or structure at its natural frequency. For a rotating mass like a motor or a pump, this occurs at the critical speed(s). Electrical resonance amplifies the magnitude of voltage or current, or both.
What factors affect resonance?
Resonance, An object free to vibrate tends to do so at a specific rate called the object’s natural, or resonant, frequency. (This frequency depends on the size, shape, and composition of the object.)
What are the effects of resonance?
Resonance Effect Or Mesomeric Effect In Chemistry The concept of resonance effect tells about the polarity induced in a molecule by the reaction between a lone pair of electron and a pi bond. It also occurs by the interaction of 2 pi bonds in the adjacent atoms.
How do you reduce resonance frequency?
How can resonance frequency be reduced
- Increasing the mass reduces the natural frequency.
- Increasing the stiffness increases the natural frequency.
- Increasing the damping increases the response range but the peak value will be reduced.
What happens when resonance occurs?
Resonance. Resonance is a phenomenon that occurs when the matching vibrations of another object increase the amplitude of an object’s oscillations.
What are the disadvantages of resonance?
The disadvantages of resonance are as follows: A negative effect of resonance could be the effect of waves hitting a rock face. The vibration of kinetic energy from the wave resonates through the rock face causing cracks and eventually great slabs of the cliff fall into the sea.
How does electrical resonance affect motor performance?
Electrical resonance amplifies the magnitude of voltage or current, or both. The increase in amplitude, whether mechanical or electrical, places more stress on motor and pump components, negatively affects operation (e.g., increased vibration, instability and energy consumption) and leads to premature failure.
How to solve the problem of resonance?
It is difficult to come up with a single remedy for all resonance problems, as they highly depend on system configuration and load conditions. Some recommendations are Move resonance frequencies away from system harmonics; Perform system analysis and harmonic simulations before installing new capacitor banks.
Are You having resonance problems with your variable frequency drive?
With an increase in variable frequency drives, resonance problems are becoming more common. Here’s some advice on what you can do about it. In the event of a breakdown, any number of issues may be the culprit, but there’s one in particular that’s particularly challenging to diagnose: resonance.
How do I calculate the resonant frequency of an installed motor?
The motor manufacturer can usually supply the information needed to calculate the system resonant frequency of an installed motor: motor weight, center of gravity and static deflection. Bases in typical installations are not truly stiff, so the actual resonant frequency of the system will probably be lower than calculations show.