TRC-SFD-1-07 - Tribology Group - Texas A&M University

Appendix A Identification of dry friction force (dry system tests)The mechanical seal dry friction force is obtained from circular orbit tests withoutany lubricant in the system. The system is excited with two constant load levels (66, 78Ν) for six frequencies (20-35 Hz). Figure A1 depicts the excitation force anddisplacement orbit at 28 Hz.Following the procedure described in [3], the energy dissipated by the system isequated to the input work. Figure A2 shows the energy dissipated by the identifiedresidual damping (C rv ) and dry friction force (F μ ), and the work input into the system.20010078 Ν66 ΝY Load [N]− 200 − 1000 100 200− 100− 200X Load [N]13080 μmMax.clearance127 μmY displacement [um]6555 μm− 130 − 650 65 130− 65− 130X displacement [um]Figure A 1 Recorded load and ensuing displacement orbits for two amplitude load levels.Clearance circle noted. (28 Hz, dry SFD, CCO)40