Final answer:
To address the unwanted oscillations in an engine part, engineers can alter its resonant frequency by changing the material, shape, mass, length, or by adding dampers or stiffening ribs.
Step-by-step explanation:
Occasionally, engine components may resonate at frequencies similar to those generated by the engine itself, leading to unwanted oscillations and noise. When a part such as one with a specific length L and mass M is identified as the source of such noise due to resonance, engineers must alter the resonant frequency of the part so it does not match the engine's frequencies. Possible solutions include changing the part's material to one with a different density, altering its shape to modify its natural frequency, or adding dampers to absorb the vibrations.
For instance, increasing the mass or altering the length of the part can help in changing its natural frequency. Another strategy is to add stiffening ribs or change the boundary conditions, such as the way the part is mounted, to affect the part's vibrational characteristics. Each of these modifications requires careful consideration to ensure that they do not adversely affect the engine's performance or the part's function.