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Nagesh Samikkanu,Junaid Basha A. M.,Thakur Dinesh Singh 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.1
The high speed flexible coupling (HSFC) is used on the fighter aircraft gas turbine engines utilizing non-lubricated, metallic flexibleplates. The HSFC has to transmit power at high speeds typically ranging from 10,000 to 18,000 rpm from engine gear box to accessorygear box. The HSFC also accommodates large axial and lateral misalignments due to thermal expansion and flight dynamics. The imposedangular and axial displacement distorts or bends the flexible plates. To achieve an infinite life design for HSFC, it is necessary tokeep away from the different natural frequencies from the operating range of speeds apart from the optimal structural strength to accommodatelarger misalignment. This paper discusses about details of system analysis, design and evaluation of HSFC for gas turbine engines. The dynamic characteristics of the HSFC are investigated through the finite element analysis (FEA) and experimental verification. The present approach can be extended for the development of similar type of flexible couplings.
Mathematical modeling of actively controlled piezo smart structures: a review
Gupta, Vivek,Sharma, Manu,Thakur, Nagesh Techno-Press 2011 Smart Structures and Systems, An International Jou Vol.8 No.3
This is a review paper on mathematical modeling of actively controlled piezo smart structures. Paper has four sections to discuss the techniques to: (i) write the equations of motion (ii) implement sensor-actuator design (iii) model real life environmental effects and, (iv) control structural vibrations. In section (i), methods of writing equations of motion using equilibrium relations, Hamilton's principle, finite element technique and modal testing are discussed. In section (ii), self-sensing actuators, extension-bending actuators, shear actuators and modal sensors/actuators are discussed. In section (iii), modeling of thermal, hygro and other non-linear effects is discussed. Finally in section (iv), various vibration control techniques and useful software are mentioned. This review has two objectives: (i) practicing engineers can pick the most suitable philosophy for their end application and, (ii) researchers can come to know how the field has evolved, how it can be extended to real life structures and what the potential gaps in the literature are.
Mathematical modeling of actively controlled piezo smart structures: a review
Vivek Gupta,Manu Sharma,Nagesh Thakur 국제구조공학회 2011 Smart Structures and Systems, An International Jou Vol.8 No.3
This is a review paper on mathematical modeling of actively controlled piezo smart structures. Paper has four sections to discuss the techniques to: (i) write the equations of motion (ii) implement sensoractuator design (iii) model real life environmental effects and, (iv) control structural vibrations. In section (i), methods of writing equations of motion using equilibrium relations, Hamilton’s principle, finite element technique and modal testing are discussed. In section (ii), self-sensing actuators, extension-bending actuators,shear actuators and modal sensors/actuators are discussed. In section (iii), modeling of thermal, hygro and other non-linear effects is discussed. Finally in section (iv), various vibration control techniques and useful software are mentioned. This review has two objectives: (i) practicing engineers can pick the most suitable philosophy for their end application and, (ii) researchers can come to know how the field has evolved, how it can be extended to real life structures and what the potential gaps in the literature are.