Contents
How do you test for resonance?
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.
How does mechanical resonance occur?
Resonance occurs when the sense of the force is the same as the sense of the motion or a natural frequency is at or close to a forcing frequency, such as rotor speed. It happens on a mechanical system exactly when the frequency of the force is exactly the natural frequency of the system.
What is an example of mechanical resonance?
Various examples of mechanical resonance include: Musical instruments (acoustic resonance). Most clocks keep time by mechanical resonance in a balance wheel, pendulum, or quartz crystal. Tidal resonance of the Bay of Fundy.
What is resonance give an example?
Pushing a person in a swing is a common example of resonance. The loaded swing, a pendulum, has a natural frequency of oscillation, its resonant frequency, and resists being pushed at a faster or slower rate.
What is resonance explain with two examples?
In physics, resonance is a phenomenon in which a vibrating system or external force drives another system to oscillate with greater amplitude at specific frequencies. [ example ] A familiar example is a playground swing, which acts as a pendulum.
How do you find the resonant length?
Use the formula v = λf to find the resonance frequency of a single continuous wave. The letter “v” stands for the wave velocity, whereas “λ” represents the distance of the wavelength.
When does a mechanical system respond to resonance?
Tendency of a mechanical system to respond at greater amplitude when the frequency of its oscillations matches the system’s natural frequency of vibration (its resonance frequency or resonant frequency) than it does at other frequencies.
What’s the best way to detect resonance in a machine?
Sweep test. The sweep test is when you manually sweep the machine through a frequency range while taking readings at every step. This can map out vibration response against speed for easy detection of problematic frequencies. However, no insight is provided regarding how frequently the machine excites resonance during normal operation.
How does Resonance Affect the vibration of a pump?
Resonance occurs when a natural frequency is at or close to a forcing frequency, such as rotor speed. For machinery—such as pumps, turbines and electric motors—resonance can amplify the small vibratory forces from machine operation, and severe vibration levels can result.
How to calculate the mechanical resonant frequency of a motor?
Method #2: A Frequency Sweep is used to sweep from a low to high frequency. A sinusoidal force is exerted on the system (via the magnetic field of the motor). The oscillation of the system is visually (or audibly) observed. The frequency of the local maximum response is noted. From Method #1 the approximate resonant frequency is already known.