Now a days, the numbers of taller and lighter structures are continuously increasing in thernconstruction industries which are flexible and having a very low damping value. Thosernstructures can easily fail under structural vibrations induced by earthquake and wind.rnTherefore several techniques are available today to minimize the vibration of the structure,rnout of which concept of using Passive auto-tuning compound pendulum mass damperrn(PATCPMD) is a newer one. There are in general large numbers of studies on theoretical rninvestigation of behaviour of buildings with tuned mass dampers under various impacts.rnHowever, the experimental studies in this area are quite limited. In this thesis, A two-storyrnsteel test model structure was used to carry out the experimental study. The PATCPMD wasrnsuspended first in the upper and second in the lower story of the structure to be controlled byrna group of ropes in the manner that they form compound pendulum but not exactly arncompound pendulum and was free to move in any translational direction. rn First, the PATCPMD efficiency tests was carried out, whereby the test model was subjectedrnto translational, torsional and coupled free vibration tests and translational forced harmonicrnvibration tests, initially without the PATCPMD and then with the PATCPMD at differentrnstory of the primary model structure, in order to determine the damping effects of thernPATCPMD and to determine the better effect of the PATCPMD with respect to location. Thernresults demonstrate that it is capable of providing significant control of translational, torsionalrnand coupled vibrations of the structure without being tuned in both cases. However, a betterrneffect was observed when the PATCPMD was suspended on the second story. rn Secondly, Once the better effect of the PATCPMD with respect to location was determined,rna parameter study was carried out whereby the dynamic properties of the primary test modelrnwas varied whilst the PATCPMD is left unchanged. The free and forced vibration testsrnwere repeated, without any tuning of the system taking place. Furthermore, the resultrndemonstrates the PATCPMDâ€™s effectiveness under different conditions of the system,rnwithout having undergone any tuning. Finally, the PATCPMD was suspended on to the testrnmodel on three different connection patterns so as to investigate the better effect out of them.rnAgain a positive results were obtained with this regard. However, pattern 1 has got a betterrnefficiency among the others two. In general the study shows that the PATCPMD is robust,rnsimple and versatile making it an ideal application for engineering structures.