Mud is a ubiquitous building material in Nigeria,perhaps this is the reason why it is hardly seen as the outright building material that it is.The most popular contribution of mud to Nigerian architecture can only be ...Mud is a ubiquitous building material in Nigeria,perhaps this is the reason why it is hardly seen as the outright building material that it is.The most popular contribution of mud to Nigerian architecture can only be seen in the ancient traditional huts all over the country.Although still a building material in the suburbs of the country,mud is seen as a relic of the past,a symbol of a primitive tale of Nigerian building construction.The primary effort here is to redefine mud as a“skin”with infinite possibilities of imagery and texture,rather than its typical application as a wall in Nigerian architecture.Mud is attempted to be expressed via a new geometric vocabulary by re-evaluating its surreptitious properties including its ability to behave like a formally defined NURBS(non-uniform rational basis spline)surface.The properties of mud and clay are unconventionally simulated in computer modelling and analysis software to understand the ways in which it can be optimized for advanced building applications.Streamlined calculations and algorithmic calculations serve as tools to discover the NURBS-propensity of mud.This provides a whole new low-cost construction opportunity for the building of irregularly flowing structures.展开更多
Nose deflection control is a new concept of fast response control model.The partial nose of projectile deflects a certain angle relative to the axis of projectile body and then pressure difference emerges on the windw...Nose deflection control is a new concept of fast response control model.The partial nose of projectile deflects a certain angle relative to the axis of projectile body and then pressure difference emerges on the windward and leeward sides of warhead.Consequently,aerodynamic control force is generated.This control way has high control efficiency and very good application prospects in the ammunition system.Nose deflection actuator based on smart material and structure enables projectile body morphing to obtain additional aerodynamic force and moment,changes the aerodynamic characteristics in the projectile flight process,produces the corresponding balance angle and sideslip angle resulting in motor overload,adjusts flight moving posture to control the ballistics,finally changes shooting range and improves firing accuracy.In order to study characteristics of self-adaptive control projectile,numerical simulations are conducted by using fluid dynamics software ANSYS FLUENT for stabilized rocket projectile.The aerodynamic characteristics at different nose delectation angles,different Mach numbers and different angles of attack are obtained and compared.The results show that the nose deflection control has great influence on the head of rocket projectile,and it causes the asymmetry of the flow field structure and the increase of pressure differences of the warhead on the windward and leeward surface,which results in a larger lift.Finally,ballistics experiments are done for verification.The results can offer theoretical basis for self-adaptive rocket projectile design and optimization and also provide new ideas and methods for field smart ammunition research.展开更多
文摘Mud is a ubiquitous building material in Nigeria,perhaps this is the reason why it is hardly seen as the outright building material that it is.The most popular contribution of mud to Nigerian architecture can only be seen in the ancient traditional huts all over the country.Although still a building material in the suburbs of the country,mud is seen as a relic of the past,a symbol of a primitive tale of Nigerian building construction.The primary effort here is to redefine mud as a“skin”with infinite possibilities of imagery and texture,rather than its typical application as a wall in Nigerian architecture.Mud is attempted to be expressed via a new geometric vocabulary by re-evaluating its surreptitious properties including its ability to behave like a formally defined NURBS(non-uniform rational basis spline)surface.The properties of mud and clay are unconventionally simulated in computer modelling and analysis software to understand the ways in which it can be optimized for advanced building applications.Streamlined calculations and algorithmic calculations serve as tools to discover the NURBS-propensity of mud.This provides a whole new low-cost construction opportunity for the building of irregularly flowing structures.
文摘Nose deflection control is a new concept of fast response control model.The partial nose of projectile deflects a certain angle relative to the axis of projectile body and then pressure difference emerges on the windward and leeward sides of warhead.Consequently,aerodynamic control force is generated.This control way has high control efficiency and very good application prospects in the ammunition system.Nose deflection actuator based on smart material and structure enables projectile body morphing to obtain additional aerodynamic force and moment,changes the aerodynamic characteristics in the projectile flight process,produces the corresponding balance angle and sideslip angle resulting in motor overload,adjusts flight moving posture to control the ballistics,finally changes shooting range and improves firing accuracy.In order to study characteristics of self-adaptive control projectile,numerical simulations are conducted by using fluid dynamics software ANSYS FLUENT for stabilized rocket projectile.The aerodynamic characteristics at different nose delectation angles,different Mach numbers and different angles of attack are obtained and compared.The results show that the nose deflection control has great influence on the head of rocket projectile,and it causes the asymmetry of the flow field structure and the increase of pressure differences of the warhead on the windward and leeward surface,which results in a larger lift.Finally,ballistics experiments are done for verification.The results can offer theoretical basis for self-adaptive rocket projectile design and optimization and also provide new ideas and methods for field smart ammunition research.
