Micro-scale functionally graded material(FGM)pipes conveying fluid have many significant applications in engineering fields.In this work,the thermoelastic vibration of FGM fluid-conveying tubes in elastic medium is st...Micro-scale functionally graded material(FGM)pipes conveying fluid have many significant applications in engineering fields.In this work,the thermoelastic vibration of FGM fluid-conveying tubes in elastic medium is studied.Based on modified couple stress theory and Hamilton’s principle,the governing equation and boundary conditions are obtained.The differential quadrature method(DQM)is applied to investigating the thermoelastic vibration of the FGM pipes.The effect of temperature variation,scale effect of the microtubule,micro-fluid effect,material properties,elastic coefficient of elastic medium and outer radius on thermoelastic vibration of the FGM pipes conveying fluid are studied.The results show that in the condition of considering the scale effect and micro-fluid of the microtubule,the critical dimensionless velocity of the system is higher than that of the system which calculated using classical macroscopic model.The results also show that the variations of temperature,material properties,elastic coefficient and outer radius have significant influences on the first-order dimensionless natural frequency.展开更多
The main aim of this research is to get a better knowledge and understanding of the micro-scale oscillatory networks behavior in the solid propellants reactionary zones. Fundamental understanding of the micro-and nano...The main aim of this research is to get a better knowledge and understanding of the micro-scale oscillatory networks behavior in the solid propellants reactionary zones. Fundamental understanding of the micro-and nano-scale combustion mechanisms is essential to the development and further improvement of the next-generation technologies for extreme control of the solid propellant thrust. Both experiments and theory confirm that the micro-and nano-scale oscillatory networks excitation in the solid propellants reactionary zones is a rather universal phenomenon. In accordance with our concept,the micro-and nano-scale structures form both the fractal and self-organized wave patterns in the solid propellants reactionary zones. Control by the shape, the sizes and spacial orientation of the wave patterns allows manipulate by the energy exchange and release in the reactionary zones. A novel strategy for enhanced extreme thrust control in solid propulsion systems are based on manipulation by selforganization of the micro-and nano-scale oscillatory networks and self-organized patterns formation in the reactionary zones with use of the system of acoustic waves and electro-magnetic fields, generated by special kind of ring-shaped electric discharges along with resonance laser radiation. Application of special kind of the ring-shaped electric discharges demands the minimum expenses of energy and opens prospects for almost inertia-free control by combustion processes. Nano-sized additives will enhance self-organizing and self-synchronization of the micro-and nano-scale oscillatory networks on the nanometer scale. Suggested novel strategy opens the door for completely new ways for enhanced extreme thrust control of the solid propulsion systems.展开更多
The Chamba\|Bharmaur syncline located in between Zanskar range in the north and Dhauladhar\|Pirpanjal range in the south , in the Chamba district of Western Himachal Pradesh. The rocks constituting Chamba\|Bharmaur sy...The Chamba\|Bharmaur syncline located in between Zanskar range in the north and Dhauladhar\|Pirpanjal range in the south , in the Chamba district of Western Himachal Pradesh. The rocks constituting Chamba\|Bharmaur syncline belong to Precambrian to Lr. Triassic (Rattan, 1973) and represent the southern extension of the Tethyan facies of the Zanskar Tethys Himalayan sequence (Thakur, 1998). The geological and structural mapping in the Chamba\|Bharmaur syncline reveal that the area comprises of various litho\|units which show imprint of various phases of deformation. Three main phases of deformation DF\-1, DF\-2 and DF\-3 have affected the rocks of the Chamba\|Bharmaur syncline. The earliest recognisable deformational structures of the area are tight isoclinal folds appressed with long drawn out limbs and thickened hinges have experienced buckle shortening of 80%. They have been rendered intrafolial folds in many places; only a few of them show disharmony. The folds initiated in the multilayered sequences are generally controlled in their distribution and wave\|length by more competent members of the sequence.展开更多
文摘Micro-scale functionally graded material(FGM)pipes conveying fluid have many significant applications in engineering fields.In this work,the thermoelastic vibration of FGM fluid-conveying tubes in elastic medium is studied.Based on modified couple stress theory and Hamilton’s principle,the governing equation and boundary conditions are obtained.The differential quadrature method(DQM)is applied to investigating the thermoelastic vibration of the FGM pipes.The effect of temperature variation,scale effect of the microtubule,micro-fluid effect,material properties,elastic coefficient of elastic medium and outer radius on thermoelastic vibration of the FGM pipes conveying fluid are studied.The results show that in the condition of considering the scale effect and micro-fluid of the microtubule,the critical dimensionless velocity of the system is higher than that of the system which calculated using classical macroscopic model.The results also show that the variations of temperature,material properties,elastic coefficient and outer radius have significant influences on the first-order dimensionless natural frequency.
基金supported by the Western-Caucasus Research Center
文摘The main aim of this research is to get a better knowledge and understanding of the micro-scale oscillatory networks behavior in the solid propellants reactionary zones. Fundamental understanding of the micro-and nano-scale combustion mechanisms is essential to the development and further improvement of the next-generation technologies for extreme control of the solid propellant thrust. Both experiments and theory confirm that the micro-and nano-scale oscillatory networks excitation in the solid propellants reactionary zones is a rather universal phenomenon. In accordance with our concept,the micro-and nano-scale structures form both the fractal and self-organized wave patterns in the solid propellants reactionary zones. Control by the shape, the sizes and spacial orientation of the wave patterns allows manipulate by the energy exchange and release in the reactionary zones. A novel strategy for enhanced extreme thrust control in solid propulsion systems are based on manipulation by selforganization of the micro-and nano-scale oscillatory networks and self-organized patterns formation in the reactionary zones with use of the system of acoustic waves and electro-magnetic fields, generated by special kind of ring-shaped electric discharges along with resonance laser radiation. Application of special kind of the ring-shaped electric discharges demands the minimum expenses of energy and opens prospects for almost inertia-free control by combustion processes. Nano-sized additives will enhance self-organizing and self-synchronization of the micro-and nano-scale oscillatory networks on the nanometer scale. Suggested novel strategy opens the door for completely new ways for enhanced extreme thrust control of the solid propulsion systems.
文摘The Chamba\|Bharmaur syncline located in between Zanskar range in the north and Dhauladhar\|Pirpanjal range in the south , in the Chamba district of Western Himachal Pradesh. The rocks constituting Chamba\|Bharmaur syncline belong to Precambrian to Lr. Triassic (Rattan, 1973) and represent the southern extension of the Tethyan facies of the Zanskar Tethys Himalayan sequence (Thakur, 1998). The geological and structural mapping in the Chamba\|Bharmaur syncline reveal that the area comprises of various litho\|units which show imprint of various phases of deformation. Three main phases of deformation DF\-1, DF\-2 and DF\-3 have affected the rocks of the Chamba\|Bharmaur syncline. The earliest recognisable deformational structures of the area are tight isoclinal folds appressed with long drawn out limbs and thickened hinges have experienced buckle shortening of 80%. They have been rendered intrafolial folds in many places; only a few of them show disharmony. The folds initiated in the multilayered sequences are generally controlled in their distribution and wave\|length by more competent members of the sequence.
