What Causes Body Resonance and Vibration Due to the Exhaust Pipe?
1 Answers
The exhaust pipe is designed with a small diameter and thin walls, which helps reduce exhaust vibration in the mid-to-low RPM range. However, high-performance-oriented models typically use multiple exhaust pipes to balance the excessive vibration caused by a single pipe at high RPMs. Here are some relevant details: 1. With the same wall thickness, a thicker exhaust pipe will experience more vibration near the exhaust manifold due to metal interference effects. However, because of the larger diameter, energy accumulation is less severe, so the vibration at the tail end of the exhaust will not be more intense. Conversely, a thinner pipe with the same wall thickness will cause less vibration at the front section, but exhaust energy will accumulate, leading to significantly increased vibration at the tail end. 2. A thicker-walled exhaust pipe itself produces much less vibration, but we must then consider the energy dynamics of the exhaust gases inside the pipe. Since the pipe absorbs less energy, more energy is reflected back into the exhaust gases. As a result, the energy from the exhaust gases colliding inside the pipe accumulates, leading to higher exhaust flow velocities. When the gases finally exit the pipe, the sudden decompression causes the exhaust noise to become louder and sharper. Additionally, as RPM increases, the pitch of this noise rises even higher. The distinctive and pleasing exhaust note of many sports cars is partly due to such exhaust pipe design considerations.
