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RISS 인기검색어
- 검색키워드
- 저자 : H. Nie (검색결과 30 건)
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Nie, G.H. Techno-Press 2000 Structural Engineering and Mechanics, An Int'l Jou Vol.10 No.2
An asymptotic solution for snap-through buckling of single-layer squarely-reticulated shallow spherical shells continuously supported on springs is developed in this paper. Based on the fundamental governing equations and boundary conditions, a nondimensional analytical expression associated with the external load, stiffness of spring and central transverse displacement (deflection) is derived with the aid of asymptotic iteration method. The effects of stiffness of spring and characteristic geometrical parameter on buckling of the structures are given by the analyses of numerical examples. In a special case, for reticulated circular plates, the influence of stiffness of spring on the characteristic relation between load and deflection is also demonstrated.
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Optimal Design for Initial Pressures of Dual-Chamber Shock-Absorbers in Landing Gears
Nie, H.,Lim, K. H. 대한기계학회 1996 International Sessions in Celebration of the 50th Vol.1 No.1
The paper deals with the optimization of initial air pressures in dual-chamber shock absorbers of aircraft landing gears. The objective function is the air-spring forces to be minimized in shock absorbers. Multi constraints are taken into consideration, such as values of energy absorbed by the air-spring under different conditions; static axial internal force and maximum stroke of the shock- strut and other design requirements. The design variables are initial air pressures in the high pressure pneumatic chamber and the low pressure oleo-pneumatic chamber. For this optimal problem, the Griffith-Stewart sequential linear programming and the variables alternation method are employed to solve it. The convergence of the optimal process is verified. It shows from analytical results that there is a group of design variables, in spite of many groups satisfied to design conditions, which not only makes air-spring force minimum, but also adapt tine initial pressures to various absorbed energy requirements. The case studies indicate the given design variables using the optimal method are in good agreement with those which are obtained using trial method in present actual engineering.
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An asymptotic analysis on non-linear free vibration of squarely-reticulated circular plates
Nie, G.H. Techno-Press 1999 Structural Engineering and Mechanics, An Int'l Jou Vol.8 No.6
In this paper an asymptotic iteration method is adopted to analyze non-linear free vibration of reticulated circular plates composed of beam members placed in two orthogonal directions. For the resulting linear ordinary differential equations in the process of iteration, the power series with rapid convergence has been applied to obtain an analytical solution for non-linear characteristic relation between the amplitude and frequency of the structure. Numerical examples are given, and the phenomena indicating hardening of such structures have been presented for the (immovable or movable) simply-supported and clamped circular plates.
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Nie, H.T.,Wan, Y.J.,You, J.H.,Wang, Z.Y.,Lan, S.,Fan, Y.X.,Wang, F. Asian Australasian Association of Animal Productio 2015 Animal Bioscience Vol.28 No.8
This research aimed to define the energy requirement of Dorper and Hu Hybrid $F_1$ ewes 20 to 50 kg of body weight, furthermore to study energy requirement changes with age and evaluate the effect of age on energy requirement parameters. In comparative slaughter trial, thirty animals were divided into three dry matter intake treatments (ad libitum, n = 18; low restricted, n = 6; high restricted, n = 6), and were all slaughtered as baseline, intermediate, and final slaughter groups, to calculate body chemical components and energy retained. In digestibility trial, twelve ewes were housed in individual metabolic cages and randomly assigned to three feeding treatments in accordance with the design of a comparative slaughter trial, to evaluate dietary energetic values at different feed intake levels. The combined data indicated that, with increasing age, the net energy requirement for maintenance ($NE_m$) decreased from $260.62{\pm}13.21$ to $250.61{\pm}11.79kJ/kg^{0.75}$ of shrunk body weight (SBW)/d, and metabolizable energy requirement for maintenance (MEm) decreased from $401.99{\pm}20.31$ to $371.23{\pm}17.47kJ/kg^{0.75}$ of SBW/d. Partial efficiency of ME utilization for maintenance ($k_m$, 0.65 vs 0.68) and growth ($k_g$, 0.42 vs 0.41) did not differ (p>0.05) due to age; At the similar condition of average daily gain, net energy requirements for growth ($NE_g$) and metabolizable energy requirements for growth ($ME_g$) for ewes during late fattening period were 23% and 25% greater than corresponding values of ewes during early fattening period. In conclusion, the effect of age upon energy requirement parameters in the present study were similar in tendency with previous recommendations, values of energy requirement for growth ($NE_g$ and $ME_g$) for Dorper and Hu crossbred female lambs ranged between the NRC (2007) recommendation for early and later maturating growing sheep.
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H.T. Nie,Y.J. Wan,J.H. You,Z.Y. Wang,S. Lan,Y.X. Fan,F. Wang 아세아·태평양축산학회 2015 Animal Bioscience Vol.28 No.8
This research aimed to define the energy requirement of Dorper and Hu Hybrid F1 ewes 20 to 50 kg of body weight, furthermore to study energy requirement changes with age and evaluate the effect of age on energy requirement parameters. In comparative slaughter trial, thirty animals were divided into three dry matter intake treatments (ad libitum, n = 18; low restricted, n = 6; high restricted, n = 6), and were all slaughtered as baseline, intermediate, and final slaughter groups, to calculate body chemical components and energy retained. In digestibility trial, twelve ewes were housed in individual metabolic cages and randomly assigned to three feeding treatments in accordance with the design of a comparative slaughter trial, to evaluate dietary energetic values at different feed intake levels. The combined data indicated that, with increasing age, the net energy requirement for maintenance (NEm) decreased from 260.62±13.21 to 250.61±11.79 kJ/kg0.75 of shrunk body weight (SBW)/d, and metabolizable energy requirement for maintenance (MEm) decreased from 401.99±20.31 to 371.23±17.47 kJ/kg0.75 of SBW/d. Partial efficiency of ME utilization for maintenance (km, 0.65 vs 0.68) and growth (kg, 0.42 vs 0.41) did not differ (p>0.05) due to age; At the similar condition of average daily gain, net energy requirements for growth (NEg) and metabolizable energy requirements for growth (MEg) for ewes during late fattening period were 23% and 25% greater than corresponding values of ewes during early fattening period. In conclusion, the effect of age upon energy requirement parameters in the present study were similar in tendency with previous recommendations, values of energy requirement for growth (NEg and MEg) for Dorper and Hu crossbred female lambs ranged between the NRC (2007) recommendation for early and later maturating growing sheep.
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INFLUENCE OF LANDING PARAMETERS ON LANDING GEAR IMPACT BEHAVIOR
Lim, K. H.,Nie, H.,Hwang, J. H.,Kim, D. M. 한국 항공대학교 항공산업기술연구소 1996 航空宇宙産業技術硏究所 硏究誌 Vol.6 No.-
This paper deals with the influence of landing parameters on landing gear impact behavior, such as the angle between strut axial and vertical at gear impact and the aircraft horizontal and sink landing speeds. Discussion and analysis are based on a simplified dynamic model which includes sprung, unsprung and rotating masses. A complete solution of the equations for the dynamic response may be obtained using a numerical method which has been used in the past with good success. Case studies show that the influence of the sink speed on the landing gear loads as well as impact behavior, in general, is greater than those of the landing angle and the horizontal speed. The horizontal speed has a distinct effect on the drag load, and the sink speed has a distinct effect on the vertical load. However the effect of the sink speed on landing gear impact behavior parameters as well as the drag load, and the effect of the impact angle on the vertical load and the efficiency of shock-absorber are also worthy to consideration.
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Jiang Sam H.,Chaudhry Nauman S.,Nie James W.,Patel Saavan,Ansari Darius,Nie Jeffrey Z.,Shah Pal,Patel Jaimin,Mehta Ankit I. 대한척추외과학회 2024 Asian Spine Journal Vol.18 No.3
Study Design: This was a retrospective case-control study using 8 years of data from a nationwide database of surgical outcomes in the United States.Purpose: This study aimed to improve our understanding of the risk factors associated with a length of stay (LOS) >1 day and aid in reducing postoperative hospitalization and complications.Overview of Literature: Despite the proven safety of transforaminal lumbar interbody fusion (TLIF), some patients face prolonged postoperative hospitalization.Methods: Data were collected from the American College of Surgeons National Surgical Quality Improvement Program dataset from 2011 to 2018. The cohort was divided into patients with LOS up to 1 day (LOS ≤1 day), defined as same day or next-morning discharge, and patients with LOS >1 day (LOS >1 day). Univariable and multivariable regression analyses were performed to evaluate predictors of LOS >1 day. Propensity-score matching was performed to compare pre- and postdischarge complication rates.Results: A total of 12,664 eligible patients with TLIF were identified, of which 14.8% had LOS ≤1 day and 85.2% had LOS >1 day. LOS >1 day was positively associated with female sex, Hispanic ethnicity, diagnosis of spondylolisthesis, American Society of Anesthesiologists classification 3, and operation length of >150 minutes. Patients with LOS >1 day were more likely to undergo intraoperative/postoperative blood transfusion (0.3% vs. 4.5%, p<0.001) and reoperation (0.1% vs. 0.6%, p=0.004). No significant differences in the rates of postdischarge complications were found between the matched groups.Conclusions: Patients with worsened preoperative status, preoperative diagnosis of spondylolisthesis, and prolonged operative time are more likely to require prolonged hospitalization and blood transfusions and undergo unplanned reoperation. To reduce the risk of prolonged hospitalization and associated complications, patients indicated for TLIF should be carefully selected.
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