From decorative and furniture fabrics to wallpaper,flooring and carpets,to mattresses,bed linen and table linen,Heimtextil brings together a diverse product range for holistic interior design January 13-16,2026.Interi...From decorative and furniture fabrics to wallpaper,flooring and carpets,to mattresses,bed linen and table linen,Heimtextil brings together a diverse product range for holistic interior design January 13-16,2026.Interior designers and buyers from the hospitality and retail sectors find the latest textile and non-textile material innovations under one roof.Leading brands and promising newcomers have already announced their participation.The new hall layout creates targeted synergies for an efficient trade fair visit.展开更多
Feasible and accurate acoustic modeling of external and internal aircraft environments is essential for designing low-noise multi-propeller aircraft.This work proposes a novel sound source equivalent approach using Li...Feasible and accurate acoustic modeling of external and internal aircraft environments is essential for designing low-noise multi-propeller aircraft.This work proposes a novel sound source equivalent approach using Lighthill's sound sources(monopole and dipole point sources)for simulating propeller noise.It establishes data transmission interfaces between aerodynamic acoustics and acoustic-solid coupling.Equations are expanded from acoustic pressure to monopole amplitude and dipole moment vector.The basic assumption is that the propeller noise has similar spatial radiation directivity as the sound point source.The radiation relationships are explicitly built between harmonic propeller noise and dipole sources at cabin cross-sections,and between harmonic propeller noise and monopole sources along cabin longitudinal sections.External acoustic pressure distributions of cabin noise are calculated using Unsteady Reynolds-Averaged Navier-Stokes(URANS)and Ffowcs Williams-Hawkings(FW-H)approach.Interior noise is calculated using frequency domain acoustic-solid coupling.Sound source equivalent approach is used to calculate the equivalent intensity of monopole or dipole point sources for external excitation.To assess accuracy of the proposed approach,both external and interior noise of a turboprop aircraft with four sixbladed propellers are calculated and compared against flight trial results of a C-130J-30 Hercules.The turboprop aircraft adopts the same size parameters as the C-130J-30 Hercules.The present frequency domain acoustic approach is accurate for interior cabin noise.It is beneficial for enhancing the design of the low-noise turboprop aircraft.展开更多
Against the backdrop of the advancement of the“Double High Plan”and the deepening of the strategy for building a cultural powerhouse,aesthetic education in architectural interior design in higher vocational colleges...Against the backdrop of the advancement of the“Double High Plan”and the deepening of the strategy for building a cultural powerhouse,aesthetic education in architectural interior design in higher vocational colleges faces dual demands for“cultural empowerment”and“skill enhancement.”Currently,prominent issues exist in this field,such as superficial integration of regional culture,disconnection between aesthetic education and professional skill training,and a lack of systematic infiltration paths.This study primarily takes regional culture in Sichuan and Chongqing as research samples,employing literature research,mixed research methods,case analysis,and action research.By analyzing the current status and dilemmas of aesthetic education practices,it constructs a four-dimensional integrated infiltration path for aesthetic education encompassing“resources-implementation-guarantee-evaluation.”This research not only provides an operable practical paradigm for aesthetic education reform in design-related majors in higher vocational colleges but also supports the living transmission of regional culture in Sichuan and Chongqing.展开更多
The aim of this paper is to simulate and study the early moments of the reactive ballistics of a large caliber projectile fired from a gun,combining 0D and 2D axisymmetric Computational Fluid Dynamics(CFD)approaches.F...The aim of this paper is to simulate and study the early moments of the reactive ballistics of a large caliber projectile fired from a gun,combining 0D and 2D axisymmetric Computational Fluid Dynamics(CFD)approaches.First,the methodology is introduced with the development of an interior ballistics(IB)lumped parameter code(LPC),integrating an original image processing method for calculating the specific regression of propellant grains that compose the gun propellant.The ONERA CFD code CEDRE,equipped with a Dynamic Mesh Technique(DMT),is then used in conjunction with the developed LPC to build a dedicated methodology to calculate IB.First results obtained on the AGARD gun and 40 mm gun test cases are in a good agreement with the existing literature.CEDRE is also used to calculate inter-mediate ballistics(first milliseconds of free flight of the projectile)with a multispecies and reactive approach either starting from the gun muzzle plane or directly following IB.In the latter case,an inverse problem involving a Latin hypercube sampling method is used to find a gun propellant configuration that allows the projectile to reach a given exit velocity and base pressure when IB ends.The methodology developed in this work makes it possible to study the flame front of the intermediate flash and depressurization that occurs in a base bleed(BB)channel at the gun muzzle.Average pressure variations in the BB channel during depressurization are in good agreement with literature.展开更多
As the global textile market continues to expand, demand for sewing threads-a critical auxiliary material-is rising. In recent years, automotive interiors, smart outdoor equipment, and medical and ecofriendly products...As the global textile market continues to expand, demand for sewing threads-a critical auxiliary material-is rising. In recent years, automotive interiors, smart outdoor equipment, and medical and ecofriendly products have emerged as new growth engines for the textile industry. This has propelled specialized niche markets for sewing threads designed for these applications, revealing significant and undeniable potential.展开更多
Under sensorless control, the position estimation error in interior permanent magnet(PM) synchronous machines will lead to parameter identification errors and a rank-deficiency issue. This paper proposes a parameter i...Under sensorless control, the position estimation error in interior permanent magnet(PM) synchronous machines will lead to parameter identification errors and a rank-deficiency issue. This paper proposes a parameter identification model that is independent of position error by combining the dq-axis voltage equations. Then, a novel dual signal alternate injection method is proposed to address the rank-deficiency issue, i.e., during one injection period, a zero, positive, and negative d-axis current injection together with a rotor position offset injection, to simultaneously identify the multi-parameters, including stator resistance, dq-axis inductances, and PM flux linkage. The proposed method is verified by experiments at different dq-axis current conditions.展开更多
We used the ocean reanalysis dataset SODA 2.2.4 to investigate the relationship between the interior branch of subtropical-tropical cells(STCs)in the Pacific Ocean and El Nino-Southern Oscillation(ENSO)over interdecad...We used the ocean reanalysis dataset SODA 2.2.4 to investigate the relationship between the interior branch of subtropical-tropical cells(STCs)in the Pacific Ocean and El Nino-Southern Oscillation(ENSO)over interdecadal timescales between 1930 and 2010,as well as the possible mechanisms involved.Interior transport within the upper pycnocline layers of STCs(InSTC)along 9°S(InSTC9s)shows a significant correlation of 0.54 with ENSO over the study period.However,there is an interdecadal shift in the relationship between InSTC along 9°N(InSTC9n)and ENSO.The correlation coefficient between InSTC9n and ENSO is not statistically significant between 1930 and 1965(PD1),but is as high as 0.68(significant at the 95% confidence level)between 1965 and 2010(PD2).Composite and regression analysis suggests that this shift may be caused by the relationship between InSTC 9 n and the tropical wind field.During PD1,InSTC9n was driven primarily by the local wind field outside equatorial region,with a relatively weak response to the equatorial wind related to ENSO.In contrast,during PD2,the wind field associated with InSTC 9 n showed a similar spatial distribution to that of ENSO within the equatorial region,indicating a close relationship between InSTC9n and ENSO.The wind stress curl associated with ENSO drives the anomalous InSTC9n in off-equatorial regions,whose signal can propagate westward in the form of Rossby wave and modulate the thermal structure of the tropical Pacific,favoring the development of ENSO.The possible connection between the Atlantic Multidecadal Oscillation(AMO)and interdecadal changes in the ENSO-InSTC9n relationship was also examined.There is a significant connection between the AMO and the interdecadal change in the relationship between ENSO and InSTC9n;however,the associated mechanism remains to be explored in future studies.展开更多
Cluster warhead dispersing technique is analyzed with gas dynamic theory. It is seen that the front cover opening and two stage dispersing system is suitable for guided sub missiles whose number is not so large. Th...Cluster warhead dispersing technique is analyzed with gas dynamic theory. It is seen that the front cover opening and two stage dispersing system is suitable for guided sub missiles whose number is not so large. The interior ballistic performances of this system are calculated with numerical calculation method. The performances such as the pressure in the pressure chambers and the velocity of the sub missiles are obtained in curve form.展开更多
文摘From decorative and furniture fabrics to wallpaper,flooring and carpets,to mattresses,bed linen and table linen,Heimtextil brings together a diverse product range for holistic interior design January 13-16,2026.Interior designers and buyers from the hospitality and retail sectors find the latest textile and non-textile material innovations under one roof.Leading brands and promising newcomers have already announced their participation.The new hall layout creates targeted synergies for an efficient trade fair visit.
基金supported by the National Natural Science Foundation of China(Nos.51576097,51976089)the Funding for Outstanding Doctoral Dissertation in Nanjing University of Aeronautics and Astronautics,China(No.BCXJ24-05)the Aeronautical Science Foundation of China(No.2023L060052001).
文摘Feasible and accurate acoustic modeling of external and internal aircraft environments is essential for designing low-noise multi-propeller aircraft.This work proposes a novel sound source equivalent approach using Lighthill's sound sources(monopole and dipole point sources)for simulating propeller noise.It establishes data transmission interfaces between aerodynamic acoustics and acoustic-solid coupling.Equations are expanded from acoustic pressure to monopole amplitude and dipole moment vector.The basic assumption is that the propeller noise has similar spatial radiation directivity as the sound point source.The radiation relationships are explicitly built between harmonic propeller noise and dipole sources at cabin cross-sections,and between harmonic propeller noise and monopole sources along cabin longitudinal sections.External acoustic pressure distributions of cabin noise are calculated using Unsteady Reynolds-Averaged Navier-Stokes(URANS)and Ffowcs Williams-Hawkings(FW-H)approach.Interior noise is calculated using frequency domain acoustic-solid coupling.Sound source equivalent approach is used to calculate the equivalent intensity of monopole or dipole point sources for external excitation.To assess accuracy of the proposed approach,both external and interior noise of a turboprop aircraft with four sixbladed propellers are calculated and compared against flight trial results of a C-130J-30 Hercules.The turboprop aircraft adopts the same size parameters as the C-130J-30 Hercules.The present frequency domain acoustic approach is accurate for interior cabin noise.It is beneficial for enhancing the design of the low-noise turboprop aircraft.
基金a phased research result of the 2024 Chongqing Vocational Education Teaching Reform Research Project,“Exploration and Practice of the‘Dual-Subject Three-Stage Three-Integration’Model for Aesthetic Education Infiltration in Architectural Interior Design”(Z2241471).
文摘Against the backdrop of the advancement of the“Double High Plan”and the deepening of the strategy for building a cultural powerhouse,aesthetic education in architectural interior design in higher vocational colleges faces dual demands for“cultural empowerment”and“skill enhancement.”Currently,prominent issues exist in this field,such as superficial integration of regional culture,disconnection between aesthetic education and professional skill training,and a lack of systematic infiltration paths.This study primarily takes regional culture in Sichuan and Chongqing as research samples,employing literature research,mixed research methods,case analysis,and action research.By analyzing the current status and dilemmas of aesthetic education practices,it constructs a four-dimensional integrated infiltration path for aesthetic education encompassing“resources-implementation-guarantee-evaluation.”This research not only provides an operable practical paradigm for aesthetic education reform in design-related majors in higher vocational colleges but also supports the living transmission of regional culture in Sichuan and Chongqing.
基金the French Defense Innovation Agency (AID)the French Procurement Agency for Armament (DGA)ONERA's scientific direction for funding and supporting the present work
文摘The aim of this paper is to simulate and study the early moments of the reactive ballistics of a large caliber projectile fired from a gun,combining 0D and 2D axisymmetric Computational Fluid Dynamics(CFD)approaches.First,the methodology is introduced with the development of an interior ballistics(IB)lumped parameter code(LPC),integrating an original image processing method for calculating the specific regression of propellant grains that compose the gun propellant.The ONERA CFD code CEDRE,equipped with a Dynamic Mesh Technique(DMT),is then used in conjunction with the developed LPC to build a dedicated methodology to calculate IB.First results obtained on the AGARD gun and 40 mm gun test cases are in a good agreement with the existing literature.CEDRE is also used to calculate inter-mediate ballistics(first milliseconds of free flight of the projectile)with a multispecies and reactive approach either starting from the gun muzzle plane or directly following IB.In the latter case,an inverse problem involving a Latin hypercube sampling method is used to find a gun propellant configuration that allows the projectile to reach a given exit velocity and base pressure when IB ends.The methodology developed in this work makes it possible to study the flame front of the intermediate flash and depressurization that occurs in a base bleed(BB)channel at the gun muzzle.Average pressure variations in the BB channel during depressurization are in good agreement with literature.
文摘As the global textile market continues to expand, demand for sewing threads-a critical auxiliary material-is rising. In recent years, automotive interiors, smart outdoor equipment, and medical and ecofriendly products have emerged as new growth engines for the textile industry. This has propelled specialized niche markets for sewing threads designed for these applications, revealing significant and undeniable potential.
文摘Under sensorless control, the position estimation error in interior permanent magnet(PM) synchronous machines will lead to parameter identification errors and a rank-deficiency issue. This paper proposes a parameter identification model that is independent of position error by combining the dq-axis voltage equations. Then, a novel dual signal alternate injection method is proposed to address the rank-deficiency issue, i.e., during one injection period, a zero, positive, and negative d-axis current injection together with a rotor position offset injection, to simultaneously identify the multi-parameters, including stator resistance, dq-axis inductances, and PM flux linkage. The proposed method is verified by experiments at different dq-axis current conditions.
基金Supported by the National Natural Science Foundation of China(No.41976027)the Laoshan Laboratory(No.LSKJ202201601)。
文摘We used the ocean reanalysis dataset SODA 2.2.4 to investigate the relationship between the interior branch of subtropical-tropical cells(STCs)in the Pacific Ocean and El Nino-Southern Oscillation(ENSO)over interdecadal timescales between 1930 and 2010,as well as the possible mechanisms involved.Interior transport within the upper pycnocline layers of STCs(InSTC)along 9°S(InSTC9s)shows a significant correlation of 0.54 with ENSO over the study period.However,there is an interdecadal shift in the relationship between InSTC along 9°N(InSTC9n)and ENSO.The correlation coefficient between InSTC9n and ENSO is not statistically significant between 1930 and 1965(PD1),but is as high as 0.68(significant at the 95% confidence level)between 1965 and 2010(PD2).Composite and regression analysis suggests that this shift may be caused by the relationship between InSTC 9 n and the tropical wind field.During PD1,InSTC9n was driven primarily by the local wind field outside equatorial region,with a relatively weak response to the equatorial wind related to ENSO.In contrast,during PD2,the wind field associated with InSTC 9 n showed a similar spatial distribution to that of ENSO within the equatorial region,indicating a close relationship between InSTC9n and ENSO.The wind stress curl associated with ENSO drives the anomalous InSTC9n in off-equatorial regions,whose signal can propagate westward in the form of Rossby wave and modulate the thermal structure of the tropical Pacific,favoring the development of ENSO.The possible connection between the Atlantic Multidecadal Oscillation(AMO)and interdecadal changes in the ENSO-InSTC9n relationship was also examined.There is a significant connection between the AMO and the interdecadal change in the relationship between ENSO and InSTC9n;however,the associated mechanism remains to be explored in future studies.
文摘Cluster warhead dispersing technique is analyzed with gas dynamic theory. It is seen that the front cover opening and two stage dispersing system is suitable for guided sub missiles whose number is not so large. The interior ballistic performances of this system are calculated with numerical calculation method. The performances such as the pressure in the pressure chambers and the velocity of the sub missiles are obtained in curve form.
