To Örebro University

Avoiding resonance, which can occur when the system is excited by a frequency equal to or close to one of the system’s natural frequencies, is crucial to ensure a safe operational system. It is essential to ensure that the system runs at a frequency away from the natural frequencies, which are the resonance frequencies. Sometimes, it is not feasible to vary the operational frequency to avoid the resonance frequencies. Therefore, the current research presents an experimental technique, namely the water-based technique for mass variation, to introduce a method of shifting the natural frequency. A beam system, with a force exciter, accelerometer and two water tanks, is studied as a case study. The mass variation can be used to shift the natural frequency away from the excitation frequency. Different water flow rate cases are examined experimentally, and the obtained response signals are studied. The application of the presented technique is discussed. The results of the tested cases show the feasibility of changing the mass to avoid resonance. The natural frequency shifting is obtained to save the system from high resonance vibration levels that may cause damage to the system.