Time-Frequency Characterization of Rotating Instabilities in a Centrifugal Pump with a Vaned Diffuser

Table 2

Some identified nonlinear interaction components.

500 rpm				600 rpm
St	Nonlinear components	St	Nonlinear components	St	Nonlinear components	St	Nonlinear components
0.064	St𝐹−7St𝑆	1.093	St𝐹+5St𝑆	0.164	St𝐹−7St𝑆	1.021	St𝐹+5St𝑆
0.336	StBPF−St𝐹	1.264	St𝐹+7St𝑆	0.336	StBPF−St𝐹	1.164	St𝐹+7St𝐹
0.493	St𝐹−2St𝑆	1.157	2St𝐹−2St𝑆	0.521	St𝐹−2St𝑆	1.185	2St𝐹−2St𝑆
0.750	St𝐹+St𝑆	1.664	St𝐹+StBPF	0.736	St𝐹+St𝑆	1.664	St𝐹+StBPF
0.835	St𝐹+2St𝑆	2.227	4St𝐹−5St𝑆	0.807	St𝐹+2St𝑆	2.300	4St𝐹−5St𝑆
0.971	2St𝐹−5St𝑆	2.328	StBPF+2St𝐹	0.971	2St𝐹−5St𝑆	2.328	StBPF+2St𝐹
0.899	5StBPF−6St𝐹	2.664	2StBPF+St𝐹	1.014	5StBPF−6St𝐹	2.664	2StBPF+St𝐹