Speed is the new stealth and earlier this week America’s top nuclear commander described a grim scenario for U.S.forces facing off against hypersonic weapons.“We do not have any defense that could deny the employmen...Speed is the new stealth and earlier this week America’s top nuclear commander described a grim scenario for U.S.forces facing off against hypersonic weapons.“We do not have any defense that could deny the employment of such a weapon against us,”Air Force Gen.John Hyten,commander of U.S.Strategic Command,told the Senate Armed Services Committee on Tuesday March 20,2018.Russian and Chinese are aggressively developing new weapons that travel at Mach 5 or higher,which is at least five times faster than speed of sound(hypersonic).These weapons travel in excess of 3,600 miles per hour(1 mile per second)and currently,no military possesses a credible defense.Finding,tracking and intercepting something that fast is unprecedented.Given that Russia and China have invested heavily in advanced defensive technologies that now hold most of our traditional forms of power projection at risk,this is a significant advantage—it is one that would impose major costs upon a defending nation.Recently,according to the director of the Army’s Rapid Capabilities and Critical Technologies Office(ARCCTO),The Army will field a battery of truck-borne hypersonic missiles in 2023,with a contract award in August,the service’s new three-star Program Executive Officer said.The service will also field a battery of 50-kilowatt lasers on Stryker armored vehicles by 2021,he said.A program to put a 100-plus-kilowatt laser on a heavy truck,however,is under review and may be combined with Air Force and/or Navy efforts to reach comparable power levels,Lt.Gen.Neil Thurgood told reporters in his interview.In this white paper we are suggesting a new technology as a counter-measure against such an adversary measure and threat that is aggressively being pursued by these two nations,Russia and China both tactically and strategically.We also briefly discuss possible physics and science of aerodynamics involved with these vehicles traveling between range of 5 Mach and higher,where we discuss current status and future direction driven by phenomena of plasma aerodynamics thorough possibly,weakly ionized gases(WIG)program that was started by the former Soviet Republics under AJAX Vehicle and that was direct understanding of the role of plasmas in the performance of this vehicle.展开更多
Generalized robust systems-based theoretical kinematic inverse/regular wedge cam procedures which produce self-centering motion applicable to three-point clamping device design about cylindrical workpieces that vary w...Generalized robust systems-based theoretical kinematic inverse/regular wedge cam procedures which produce self-centering motion applicable to three-point clamping device design about cylindrical workpieces that vary within a prescribed size range are presented.Within such presentment,various parametric(trigonometric,combined loop closure with vector projection/resolution,transformation)and rectangular form(Taylor series approximation,trigonometric substitution&transformation(TS&T),nonlinear ODE)equation methods along with related statics and dynamics are explored.In connection,a simulated unified resultant amplitude method(URAM)is applied for generalization purposes.Moreover,the theoretical framework is validated within the context of a computer-generated model of a mechanism design which demon-strates self-centering over the prescribed design range with negligible to zero error.Furthermore,the static and dynamic analyses are verified through com-puter-aided engineering simulation in conjunction with equilibrium equations and a consideration of various calculus principles.Consequently,the self-centering theoretical formulation coupled with static and dynamic analyses provide for an accurate and generalized quantitative model couched within a holistic systems engineering framework which can be useful for providing state-of-the-art engineering and design optimization of various parameters for developing new and/or improved self-centering gripping devices of the inverse/regular wedge cam type.展开更多
Techniques of robust sensitivity design optimization involving nonlinear interior point algorithms and/or second derivatives are utilized in concert with recently developed generalized robust systems-based theoretical...Techniques of robust sensitivity design optimization involving nonlinear interior point algorithms and/or second derivatives are utilized in concert with recently developed generalized robust systems-based theoretical kinematic inverse/regular wedge cam procedures for producing self-centering motion applicable to three-point clamping device design about cylindrical workpieces that vary within a prescribed size range.With the use of the FindMinimum function in Wolfram Mathematica for exploring the specific optimization application to associated product designs in conjunction with computer-aided engineering validation efforts,significantly novel results are revealed related to improving force convergence and stabilization between grippers across the full diametral surface range(on the order of 15 to 10 times respectively)which is highly beneficial for clamping force and contact stress as well as dynamic characteristics including vibration among others.Essentially,the utilized systems-based quantitative model for inverse/regular wedge cam design coupled with robust sensitivity design optimization automatically develops and locates the perfect cam in connection to the overall mechanism system design layout within context of the desired self-centering function.展开更多
文摘Speed is the new stealth and earlier this week America’s top nuclear commander described a grim scenario for U.S.forces facing off against hypersonic weapons.“We do not have any defense that could deny the employment of such a weapon against us,”Air Force Gen.John Hyten,commander of U.S.Strategic Command,told the Senate Armed Services Committee on Tuesday March 20,2018.Russian and Chinese are aggressively developing new weapons that travel at Mach 5 or higher,which is at least five times faster than speed of sound(hypersonic).These weapons travel in excess of 3,600 miles per hour(1 mile per second)and currently,no military possesses a credible defense.Finding,tracking and intercepting something that fast is unprecedented.Given that Russia and China have invested heavily in advanced defensive technologies that now hold most of our traditional forms of power projection at risk,this is a significant advantage—it is one that would impose major costs upon a defending nation.Recently,according to the director of the Army’s Rapid Capabilities and Critical Technologies Office(ARCCTO),The Army will field a battery of truck-borne hypersonic missiles in 2023,with a contract award in August,the service’s new three-star Program Executive Officer said.The service will also field a battery of 50-kilowatt lasers on Stryker armored vehicles by 2021,he said.A program to put a 100-plus-kilowatt laser on a heavy truck,however,is under review and may be combined with Air Force and/or Navy efforts to reach comparable power levels,Lt.Gen.Neil Thurgood told reporters in his interview.In this white paper we are suggesting a new technology as a counter-measure against such an adversary measure and threat that is aggressively being pursued by these two nations,Russia and China both tactically and strategically.We also briefly discuss possible physics and science of aerodynamics involved with these vehicles traveling between range of 5 Mach and higher,where we discuss current status and future direction driven by phenomena of plasma aerodynamics thorough possibly,weakly ionized gases(WIG)program that was started by the former Soviet Republics under AJAX Vehicle and that was direct understanding of the role of plasmas in the performance of this vehicle.
文摘Generalized robust systems-based theoretical kinematic inverse/regular wedge cam procedures which produce self-centering motion applicable to three-point clamping device design about cylindrical workpieces that vary within a prescribed size range are presented.Within such presentment,various parametric(trigonometric,combined loop closure with vector projection/resolution,transformation)and rectangular form(Taylor series approximation,trigonometric substitution&transformation(TS&T),nonlinear ODE)equation methods along with related statics and dynamics are explored.In connection,a simulated unified resultant amplitude method(URAM)is applied for generalization purposes.Moreover,the theoretical framework is validated within the context of a computer-generated model of a mechanism design which demon-strates self-centering over the prescribed design range with negligible to zero error.Furthermore,the static and dynamic analyses are verified through com-puter-aided engineering simulation in conjunction with equilibrium equations and a consideration of various calculus principles.Consequently,the self-centering theoretical formulation coupled with static and dynamic analyses provide for an accurate and generalized quantitative model couched within a holistic systems engineering framework which can be useful for providing state-of-the-art engineering and design optimization of various parameters for developing new and/or improved self-centering gripping devices of the inverse/regular wedge cam type.
文摘Techniques of robust sensitivity design optimization involving nonlinear interior point algorithms and/or second derivatives are utilized in concert with recently developed generalized robust systems-based theoretical kinematic inverse/regular wedge cam procedures for producing self-centering motion applicable to three-point clamping device design about cylindrical workpieces that vary within a prescribed size range.With the use of the FindMinimum function in Wolfram Mathematica for exploring the specific optimization application to associated product designs in conjunction with computer-aided engineering validation efforts,significantly novel results are revealed related to improving force convergence and stabilization between grippers across the full diametral surface range(on the order of 15 to 10 times respectively)which is highly beneficial for clamping force and contact stress as well as dynamic characteristics including vibration among others.Essentially,the utilized systems-based quantitative model for inverse/regular wedge cam design coupled with robust sensitivity design optimization automatically develops and locates the perfect cam in connection to the overall mechanism system design layout within context of the desired self-centering function.
