{"response":{"docs":[{"system_create_dtsi":"2017-10-27T02:32:11Z","system_modified_dtsi":"2018-08-01T18:37:54Z","has_model_ssim":["Article"],"id":"bc386t31h","accessControl_ssim":["d713d6bc-d6cc-46c5-90e6-f0310b2e821c"],"hasRelatedMediaFragment_ssim":["bc386t32s"],"hasRelatedImage_ssim":["bc386t32s"],"depositor_ssim":["cohenky@ucmail.uc.edu"],"depositor_tesim":["cohenky@ucmail.uc.edu"],"title_tesim":["Model-Independent Vibration Control of Flexible Beam-Like Structures Using a Fuzzy Based Adaptation Strategy"],"date_uploaded_dtsi":"2017-02-08T00:00:00Z","date_modified_dtsi":"2017-04-05T00:00:00Z","isPartOf_ssim":["admin_set/default"],"proxy_depositor_ssim":["dungavjk@mail.uc.edu"],"doi_tesim":["10.1177/1045389X9700800304"],"journal_title_tesim":["Journal of Intelligent Material Systems and Structures"],"college_tesim":["Engineering and Applied Science"],"department_tesim":["Aerospace Engineering and Engineering Mechanics"],"note_tesim":["This work was part of a pilot \"mediated-deposit model\" where library staff found potential works, later submitted for faculty review"],"creator_tesim":["Abramovich, Haim","Weller, T.","Cohen, Kelly","Levitas, Joseph"],"language_tesim":["English"],"description_tesim":["The present study deals with an AFCA (Adaptive Fuzzy Control Algorithm) for an Euler-Bernoulli approximation of a two-dimensional version of a cantilever beam-like orthogonal tetrahedral space truss. Transient disturbances, modeled as a unit impulse, excite all the modes of the beam. The resulting transverse displacement at the free end of the beam and its corresponding rate are observed by sensors placed there, and active control of the beam is provided by a collocated force actuator.\n\nA design methodology for the closed-loop control algorithm that is independent of an exact mathematical model (space-state model, F.E.M., etc.) of plant dynamics and which is based on fuzzy logic is presented. First, the behavior of the open-loop system is observed. Then, the control force applied to the system emulates the behavior of a dynamic vibration absorber which is tuned to the measured fundamental frequency. This approach not only assures inherent stability associated with passive absorbers, but also circumvents the phenomenon of modal spillover. The damping and the mass ratios of the absorber adapt themselves by using a fuzzy decision-making process. This results in relatively quick settling times, low overshoots and dying out of vibration within a few seconds.\n\nWhen the control force is turned off after a mere 16 seconds, almost all the vibrational energy is dissipated. In addition, the performance of the AFCA is insensitive to varying initial conditions. To demonstrate the robustness of the control system to changes in the temporal dynamics of the cantilever beam, the transient response to a considerably perturbed plant is simulated. The Young's modulus of the beam was raised as well as lowered substantially, thereby significantly perturbing the natural frequencies of vibration. The mode shapes, however, remain unchanged. For these cases, too, the AFCA provides similar settling times and rates of vibrational energy dissipation."],"license_tesim":["http://rightsstatements.org/vocab/InC/1.0/"],"date_created_tesim":["1997-03"],"source_tesim":["Journal of Intelligent Material Systems and Structures"],"thumbnail_path_ss":"/downloads/bc386t32s?file=thumbnail","suppressed_bsi":false,"actionable_workflow_roles_ssim":["admin_set/default-default-depositing"],"workflow_state_name_ssim":["deposited"],"member_ids_ssim":["bc386t32s"],"file_set_ids_ssim":["bc386t32s"],"visibility_ssi":"open","admin_set_tesim":["Default Admin Set"],"sort_title_ssi":"MODELINDEPENDENT VIBRATION CONTROL OF FLEXIBLE BEAMLIKE STRUCTURES USING A FUZZY BASED ADAPTATION STRATEGY","human_readable_type_tesim":["Article"],"read_access_group_ssim":["public"],"read_access_person_ssim":["konecnmc@ucmail.uc.edu"],"edit_access_person_ssim":["cohenky@ucmail.uc.edu"],"nesting_collection__pathnames_ssim":["bc386t31h"],"nesting_collection__deepest_nested_depth_isi":1,"_version_":1697073736834875392,"timestamp":"2021-04-15T03:00:35.867Z","score":0.00049999997},{"system_create_dtsi":"2017-10-27T02:32:03Z","system_modified_dtsi":"2018-08-01T18:37:53Z","has_model_ssim":["Article"],"id":"bc386t27x","accessControl_ssim":["2f463021-8328-40e0-8bee-e4a9ea42f2cf"],"hasRelatedMediaFragment_ssim":["bc386t286"],"hasRelatedImage_ssim":["bc386t286"],"depositor_ssim":["cohenky@ucmail.uc.edu"],"depositor_tesim":["cohenky@ucmail.uc.edu"],"title_tesim":["Passive Damping Augmentation for Vibration Suppression in Flexible Latticed Beam-Like Space Structures"],"date_uploaded_dtsi":"2017-02-08T00:00:00Z","date_modified_dtsi":"2017-04-05T00:00:00Z","isPartOf_ssim":["admin_set/default"],"proxy_depositor_ssim":["dungavjk@mail.uc.edu"],"doi_tesim":["10.1006/jsvi.1994.1332"],"journal_title_tesim":["Journal of Sound and Vibration"],"college_tesim":["Engineering and Applied Science"],"department_tesim":["Aerospace Engineering and Engineering Mechanics"],"note_tesim":["This work was part of a pilot \"mediated-deposit model\" where library staff found potential works, later submitted for faculty review"],"creator_tesim":["Weller, T.","Cohen, Kelly"],"language_tesim":["English"],"description_tesim":["For a Timoshenko beam model the equations of motion, representing the anisotropic continuum model of a two-dimensional, latticed, large space structure, are extended to include coupling between the extensional, shear and bending modes. This analytical model, applied to a 20-bay, orthogonal, tetrahedral, cantilevered truss structure, is used to determine the transient response when subjected to a unit impulse. It is demonstrated that for beam-like structures having a fixed bending stiffness and beam mass an increase in diagonal stiffness, on account of the stiffness of the vertical girder, leads to a rise in the transverse shear rigidity. This results in higher natural frequencies and a reduction in peak displacement. In addition, in an asymmetrical truss configuration, coupling between the extensional and shear modes raises the maximum peak displacement compared to that obtained for a symmetric truss. The model is modified to investigate the introduction of passive damping in the form of several dynamic vibration absorbers. For a fixed absorber mass budget, a simple yet efficient absorber parameter optimization procedure, based on the classical steady state criteria of a 2-DOF system, is developed to design several absorbers each tuned to a different modal frequency. It is found that inclusion of transverse shear rigidity, as a design parameter in damping augmentation studies, reduces settling time for predetermined maximum peak displacements."],"license_tesim":["http://rightsstatements.org/vocab/InC/1.0/"],"date_created_tesim":["1994-08"],"source_tesim":["Journal of Sound and Vibration"],"thumbnail_path_ss":"/downloads/bc386t286?file=thumbnail","suppressed_bsi":false,"actionable_workflow_roles_ssim":["admin_set/default-default-depositing"],"workflow_state_name_ssim":["deposited"],"member_ids_ssim":["bc386t286"],"file_set_ids_ssim":["bc386t286"],"visibility_ssi":"open","admin_set_tesim":["Default Admin Set"],"sort_title_ssi":"PASSIVE DAMPING AUGMENTATION FOR VIBRATION SUPPRESSION IN FLEXIBLE LATTICED BEAMLIKE SPACE STRUCTURES","human_readable_type_tesim":["Article"],"read_access_group_ssim":["public"],"read_access_person_ssim":["konecnmc@ucmail.uc.edu"],"edit_access_person_ssim":["cohenky@ucmail.uc.edu"],"nesting_collection__pathnames_ssim":["bc386t27x"],"nesting_collection__deepest_nested_depth_isi":1,"_version_":1697095641371508736,"timestamp":"2021-04-15T08:48:45.661Z","score":0.00049999997}],"facets":[{"name":"human_readable_type_sim","items":[{"value":"Article","hits":2,"label":"Article"}],"label":"Human Readable Type Sim"},{"name":"creator_sim","items":[{"value":"Cohen, Kelly","hits":2,"label":"Cohen, Kelly"},{"value":"Weller, T.","hits":2,"label":"Weller, T."},{"value":"Abramovich, Haim","hits":1,"label":"Abramovich, Haim"},{"value":"Levitas, Joseph","hits":1,"label":"Levitas, Joseph"}],"label":"Creator Sim"},{"name":"subject_sim","items":[],"label":"Subject Sim"},{"name":"college_sim","items":[{"value":"Engineering and Applied Science","hits":2,"label":"Engineering and Applied Science"}],"label":"College Sim"},{"name":"department_sim","items":[{"value":"Aerospace Engineering and Engineering Mechanics","hits":2,"label":"Aerospace Engineering and Engineering Mechanics"}],"label":"Department Sim"},{"name":"language_sim","items":[{"value":"English","hits":2,"label":"English"}],"label":"Language Sim"},{"name":"publisher_sim","items":[],"label":"Publisher Sim"},{"name":"date_created_sim","items":[{"value":"1994-08","hits":1,"label":"1994-08"},{"value":"1997-03","hits":1,"label":"1997-03"}],"label":"Date Created Sim"},{"name":"member_of_collection_ids_ssim","items":[],"label":"Member Of Collection Ids Ssim"},{"name":"generic_type_sim","items":[{"value":"Work","hits":2,"label":"Work"}],"label":"Generic Type Sim"}],"pages":{"current_page":1,"next_page":null,"prev_page":null,"total_pages":1,"limit_value":10,"offset_value":0,"total_count":2,"first_page?":true,"last_page?":true}}}