A colleague came up with a question about a cyclic hydrogen compressor...? !

Normally, the higher the compression ratio, the greater the vibration should be, right for reciprocating compressors?

Is there a version with a stepless air volume adjustment system?

The higher the pressure ratio, the more work the compressor has to perform. More work inevitably has a certain impact on the impeller or valves.

Pressure ratio has nothing to do with flow rate, right? The pressure ratio is the ratio of outlet pressure to inlet pressure (a ratio of absolute pressures)

What the original poster is asking about seems to be a circulating hydrogen compressor; generally, turbine engines are used for such compressors in hydrogenation processes

Just laugh if you want to; the definition of bitrate doesn’t include anything about traffic volume. I don’t know which expert told you that pressure is related to flow rate

What I mean is: you might have increased the rotational speed, which caused the compression ratio to rise (but relatively speaking, the increase in flow rate was even greater), and that’s why the vibration was reduced. Regarding the relationship between compression ratio and flow rate: At each speed of the centrifugal compressor, the compression ratio increases first and then decreases as the volumetric flow rate increases. On each curve, there is a point at which the compression ratio is at its highest, corresponding to a certain flow rate; this point is known as the peak. In fact, connecting the peak points at various rotational speeds forms the surge boundary line of the compressor. The closer to the surge boundary line, the worse the compressor’s performance ； The performance will be better when it is far away. Study hard and be humble. A bright future awaits; work hard!