Measurement and evaluation of mechanical vibration of reciprocating piston engines and piston compressors with power ratings above 100 kW - Addition to DIN ISO 10816-6
|Publication Date:||1 May 2004|
|ICS Code (Vibrations, shock and vibration measurements):||17.160|
Scope of application
Guideline VDI 3838 essentially applies to rigidly or flexibly mounted reciprocating piston engines and piston compressors with power ratings above 100 kW and speeds between 120 rpm and 3000 rpm. Typical examples of applications include: drive engines for ships, engines for auxiliary equipment in ships, engines for diesel generator sets and for diesel locomotives, and also gas compressors. This guideline provides practical instructions on measuring and evaluating vibration when measurements are taken at the non-rotating and non-reciprocating parts of complete machines. Guide values for the permissible vibration of mounted components such as pumps, intercoolers or turbochargers are not provided in this guideline. Nor does it deal with torsional vibration, axial vibration or benching vibration of the crankshafts.
Guideline VDI 3838 does not apply to all large twostroke engines with speeds below 120 rpm. When assessing the vibration of these engines it will be necessary to refer to the experience of the corresponding manufacturer.
Guideline VDI 3838 does not apply to generating sets with reciprocating internal combustion engines of the block type: in these cases, standards ISO 8528-9 or DIN ISO 8528-9 apply. Also excluded are machines installed in road vehicles (for example, in trucks, passenger cars, self-propelled construction equipment and tractors) and also machines with rotary pistons.
Guideline VDI 3838 does not apply to machines which drive or are driven by the reciprocating piston machine unless the machine in question is also a reciprocating piston machine. They should be assessed on the basis of the standards which apply to them and in accordance with the intended service conditions.
The general evaluation criteria presented here apply not only to acceptance measurements and operational monitoring at the place of installation but also to acceptance procedures in testing facilities. They should ensure that the vibration of the machine do not have any negative influence on the environment, on the operating personnel or on components mounted directly on the machine. Further detailed information about measuring and evaluating the vibration of reciprocating piston engines and compressors is provided in guideline VDI 3839 Part 8.
It should be noted that the evaluation criteria are applicable only with qualifications if the effects of internal machine parts are to be covered; you should not necessarily expect problems, for example, with valves, piston play, piston rings and so on to be revealed or be detectable in the measurement signals. Detection of such problems calls for the use of special investigation methods which are not the subject of this guideline. Noise generation is not covered either.