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What Causes the Resonance Hum in the Cab?

1 Answers

BriannaRose

07/29/25 4:55pm

The possible causes of resonance hum in the cab are as follows: 1. Whole vehicle resonance caused by the front axle: Excessive unbalance in brake drums or wheel hubs; Out-of-round brake drums. 2. Whole vehicle resonance caused by the rear (middle) axle: Out-of-round brake drums. 3. Whole vehicle resonance caused by engine mounts: Low bracket stiffness with significant elastic deformation; High hardness of mount cushions with large dynamic and static stiffness. 4. Whole vehicle resonance caused by the engine itself: Uneven fuel injection among engine cylinders, leading to incomplete combustion or non-operation in some cylinders; Large manufacturing tolerances of parts, with excessive unbalance in pistons, connecting rods, crankshaft flywheels, etc. 5. Whole vehicle resonance caused by the suspension system: Unreasonable matching of vibration frequencies between front and rear suspensions; Coupling of front spring natural frequency with the frame's inherent frequency.

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