Study of corrugated disc rotary damper based on intelligent effect

2012 ◽  
Vol 23 (9) ◽  
pp. 995-1000
Author(s):  
Shumei Chen ◽  
Wei Shi
Keyword(s):  
Electrorheological Fluid ◽  
Total Output ◽  
Comparative Performance ◽  
Numerical Studies ◽  
Output Torque ◽  
Fluid Damper ◽  
Dual Plate ◽  
Fluent Software ◽  
Magnetorheological Suspension ◽  
The Impact

An experimental rotary damper device with a corrugated disc and a plate disc (called corrugated damper) has been examined. The narrow gap between the two discs is filled with an electrorheological fluid (or magnetorheological suspension); therefore, the electrostructural effect has to be taken into consideration. Computational fluid dynamics (FLUENT software) is used to produce comparative performance data between corrugated rotary damper and ordinary dual-plate rotary damper. Theoretical and numerical studies have shown that the total output torque increment for the corrugated disc rotary damper is significantly larger than that of the dual-disc rotary damper when the impact of the electric field strength is ignored. The results help the optimal design of a pre-prototyping structure with an electrorheological (or magnetorheological suspension) fluid damper.

An Experimental Investigation of Electrorheological Fluid Damper Recoil System Used in Heavy Duty Application

2019 ◽  
Author(s):  
Santosh R. Patil ◽  
S. Krishna ◽  
S. S. Gawade ◽  
R. G. Desavale
Keyword(s):  
Dynamic Performance ◽  
Research Work ◽  
Electrorheological Fluid ◽  
Original Position ◽  
Numerical Studies ◽  
Gun Barrel ◽  
Hilly Region ◽  
Fluid Damper ◽  
Mass Displacement ◽  
Er Damper

Abstract In this paper, a detailed analysis of a recoil system of an artillery gun has been carried out with a view to minimize recoil length by absorbing the thrust produced due to firing and bring the gun barrel to its original position for the next round of fire. In many structural and defense applications, minimization of recoil length is one of the major concerns. A lot of research work has been carried out on the recoil mechanism of an artillery gun to improve its mobility in the hilly region. The effect of recoil mass displacement and high fire rate to improve the overall efficiency of an artillery gun has been studied. In this work, the performance of an artillery gun recoil system is studied by using a damper with electrorheological (ER) fluid. Experimental and numerical studies are carried out to evaluate the performance of the recoil system in terms of recoil length and total recoil time at different elevation angles of firing, ranging from 0 to 80°. It is seen that the use of developed ER damper in the gun recoil system improves its dynamic performance.

scholarly journals Evaluation of the impact of compliance of precast discs of overlapping on the work of the frame of a multi-storey building

2019 ◽  
Vol 97 ◽  
pp. 04022
Author(s):  
Nikolay Trekin ◽  
Emil Kodysh ◽  
Alexander Bybka ◽  
Alexander Yamalov ◽  
Nikita Konkov
Keyword(s):  
Economic Performance ◽  
Computational Models ◽  
Precast Concrete ◽  
Building Frames ◽  
Frame Building ◽  
Numerical Studies ◽  
Frame Buildings ◽  
The Impact ◽  
Structural Solutions ◽  
Storey Building

The article provides an analysis and justification of the need to take into account the compliance of discs of overlapping and coatings when calculating frames from precast concrete structures. Previously conducted full-scale experiments showed that the rigidity of the precast overlapping with full filling of the seams, in comparison with the monolithic overlapping, decreases by 3-15 times due to the ductility of the joints. The use of refined computational models of structural solutions for frames, which take into account the compliance of the conjugations of elements, makes it possible to trace possible redistribution of efforts. Such an approach when reconstructing, it is possible to optimally select and calculate the enforcement of structure, and on new designing, to increase reliability and / or improve the economic performance of frame buildings. According to the results of analytical studies, formulas were adopted for the parameters that allow one to take into account the overall compliance of overlapping disks and coatings in computational models of building frames. Numerical studies on the computational model of a frame building made it possible to evaluate the effect of accounting for compliance on the stress-strain state of a multi-storey frame.

scholarly journals On The Contribution of Interest Expense (Income) on Total Output

2021 ◽  
Vol 4 (1) ◽  
pp. 31-56
Author(s):  
Ahmed Mehedi Nizam
Keyword(s):  
Interest Rate ◽  
Aggregate Demand ◽  
Total Output ◽  
Response Analysis ◽  
Panel Var ◽  
Intuitive Reasoning ◽  
Body Of Knowledge ◽  
Interest Income ◽  
Structural Panel ◽  
The Impact

Abstract A decrease in interest rate in traditional view of monetary policy transmission is linked to a lower cost of borrowing which eventually results into a greater spending in investment and a bigger GDP. However, a decrease in interest rate is also linked to a decrease in interest income which, in turn, affects the aggregate demand and total GDP. So far, no concerted effort has been made to investigate this positive inter-relation between interest income and GDP in the existing literature. Here in the first place we intuitively describe the inter-relation between interest income and output and then provide a micro-foundation of our intuitive reasoning in the context of a small endowment economy with finitely-lived identical households. Then we try to uncover the impact of nominal interest income on the macroeconomy using multiplier theory for a panel of some 04 (four) OECD countries. We define and calculate the corresponding multiplier values algebraically and then we empirically measure them using impulse response analysis under structural panel VAR framework. Large, consistent and positive values of the cumulative multipliers indicate a stable positive relationship between nominal interest income and output. Moreover, variance decomposition of GDP shows that a significant portion of the variance in GDP is attributed to interest income under VAR/VECM framework. Finally, we have shown how and where our analysis fits into the existing body of knowledge.

scholarly journals Numerical Studies of the Effects of Water Capsules on Self-Healing Efficiency and Mechanical Properties in Cementitious Materials

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Haoliang Huang ◽  
Guang Ye
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Elastic Modulus ◽  
Cementitious Materials ◽  
Self Healing ◽  
Negative Effects ◽  
Numerical Studies ◽  
Healing Efficiency ◽  
The Impact ◽  
Positive Effect

In this research, self-healing due to further hydration of unhydrated cement particles is taken as an example for investigating the effects of capsules on the self-healing efficiency and mechanical properties of cementitious materials. The efficiency of supply of water by using capsules as a function of capsule dosages and sizes was determined numerically. By knowing the amount of water supplied via capsules, the efficiency of self-healing due to further hydration of unhydrated cement was quantified. In addition, the impact of capsules on mechanical properties was investigated numerically. The amount of released water increases with the dosage of capsules at different slops as the size of capsules varies. Concerning the best efficiency of self-healing, the optimizing size of capsules is 6.5 mm for capsule dosages of 3%, 5%, and 7%, respectively. Both elastic modulus and tensile strength of cementitious materials decrease with the increase of capsule. The decreasing tendency of tensile strength is larger than that of elastic modulus. However, it was found that the increase of positive effect (the capacity of inducing self-healing) of capsules is larger than that of negative effects (decreasing mechanical properties) when the dosage of capsules increases.

scholarly journals Experimental-numerical studies of the effect of cell structure on the mechanical properties of polypropylene foams

e-Polymers ◽  
2020 ◽  
Vol 20 (1) ◽  
pp. 713-723
Author(s):  
Wei Gong ◽  
Tuan-Hui Jiang ◽  
Xiang-Bu Zeng ◽  
Li He ◽  
Chun Zhang
Keyword(s):  
Mechanical Properties ◽  
Size Distribution ◽  
Cell Size ◽  
Cell Structure ◽  
Structure Parameters ◽  
Cell Size Distribution ◽  
Numerical Studies ◽  
Polypropylene Foam ◽  
The Impact ◽  
The Relationship

AbstractThe effects of the cell size and distribution on the mechanical properties of polypropylene foam were simulated and analyzed by finite element modeling with ANSYS and supporting experiments. The results show that the reduced cell size and narrow size distribution have beneficial influences on both the tensile and impact strengths. Decreasing the cell size or narrowing the cell size distribution was more effective for increasing the impact strength than the tensile strength in the same case. The relationship between the mechanical properties and cell structure parameters has a good correlation with the theoretical model.

Ballistic response of 12.7 mm armour piercing projectile against perforated armour developed from structural steel

2018 ◽  
Vol 233 (10) ◽  
pp. 1993-2005
Author(s):  
A Mubashar ◽  
Emad Uddin ◽  
S Anwar ◽  
N Arif ◽  
S Waheed Ul Haq ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Structural Steel ◽  
Perforated Plate ◽  
High Hardness ◽  
The Core ◽  
Numerical Studies ◽  
Ballistic Protection ◽  
Asymmetric Impact ◽  
Impact Side ◽  
The Impact

This study investigates ballistic response of a developed perforated armour plate against 12.7 mm armour piercing tracer projectile. Experimental as well as numerical studies were carried out and the penetration of the projectile through a base aluminium plate was determined with and without the perforated armour plate. The armour piercing projectiles were able to penetrate the base armour plate in successive impacts. However, the combination of the perforated and base armour plates was able to stop the penetration of the armour piercing projectile. A finite element method-based numerical model was developed to investigate the defeating phenomenon of perforated and base armour plate combination. It was observed that the asymmetric impact of the projectile core did not produce large enough bending to fracture the core. However, the high hardness of the developed perforated plate was able to shatter the projectile core in multiple fragments which were then unable to penetrate the base armour plate. Craters of varying depths were observed on the impact side of the base armour plate. The research showed that the selected structural steel can be successfully used for ballistic protection.

scholarly journals Falling weight impact test of a new-type flexible rock-shed

2018 ◽  
Vol 38 (2) ◽  
pp. 242-252
Author(s):  
Jianrong Yang ◽  
Zhiyu Zhang
Keyword(s):  
Experimental Studies ◽  
Steel Tube ◽  
Time Interval ◽  
Explicit Finite Element ◽  
Numerical Studies ◽  
Structural Details ◽  
Tensile Forces ◽  
New Type ◽  
Falling Weight ◽  
The Impact

A new concept of a flexible rock-shed is presented for protection of the railway from falling rocks. The flexible rock-shed is made of flexible nets connected by specific spring spacer bars to an array of reinforced concrete portable frames which are linked by a longitudinal steel tube truss. To evaluate the performance of the flexible rock-shed, experimental and numerical studies are carried out in the present study. Impact tests are conducted on a full-scale partial model of the prototype structure when it is subjected to a falling block of 340 kg. The impact time interval, maximum deflection of the flexible net, tensile forces in the supporting ropes, and axial strains of spring spacer bars are recorded. To further examine the dynamic behavior of the flexible rock-shed, numerical simulations are also carried out by using the explicit finite element code ANSYS/LS-DYNA. It is found that the numerical results coincide well with the experimental data and both the numerical and experimental studies reveal that the structure can withstand impact energy of 50 kJ with all the materials working in the elastic range. The structural details are improved and the basis for the design and construction of similar structures in the future is provided.<br>

scholarly journals ОСОБЛИВОСТІ ВПЛИВУ ДІЯЛЬНОСТІ СІЛЬСЬКОГОСПОДАРСЬКИХ ПІДПРИЄМСТВ НА СТАЛИЙ РОЗВИТОК РЕГІОНІВ

2021 ◽  
Vol 151 (5) ◽  
pp. 45-55
Author(s):  
Марина В. Поленкова
Keyword(s):  
Sustainable Development ◽  
Social Sustainability ◽  
Grain Legumes ◽  
Environmental Indicators ◽  
Total Output ◽  
Manufacturing Companies ◽  
Forage Crops ◽  
Regional Sustainability ◽  
Crop Area ◽  
The Impact

The article substantiates the relevance of sustainable development in modern business settings. The study provides calculation of indices of economic, environmental and social sustainability of regions in the 2017–2019 period along with suggesting an algorithm for a multifactor dynamic regression modeling method application. Within the scope of this research, the impact of agribusiness companies’ performances on economic, environmental and social sustainability of regions has been measured to integrate them as the key elements of aggregated indices of regional sustainable development. The greatest influence among the studied indicators on the economic, ecological and social sustainability of the region was revealed. To attain the research agenda, a methodological approach based on the calculation of indices and growth rates for relevant economic, social and environmental indicators has been employed. The findings reveal that the greatest impact on regional economic sustainability have the following indicators: total output of roots, tubers, vegetables and cucurbits produced by food manufacturing companies of all categories; the crop area for harvesting grain and grain legumes; total output of industrial crops; the area for forage crops harvesting. The greatest impact on environmental regional sustainability is attributed to the following indicators: the crop area for harvesting roots, tubers, vegetables and cucurbits; the area where the pesticides were applied. The greatest impact on social regional sustainability among all indicators under study has been demonstrated by the output of grain and grain legumes and the crop area for harvesting industrial crops. Based on the research findings, in the context of agribusiness strategic planning, the study provides a reasoned argument as to the critical need to adhere to the basic principles of sustainable development to ensure further socioeconomic growth in rural areas.

scholarly journals Applications of nanotechnology with hybrid Photovoltaic/Thermal systems

2020 ◽  
pp. 1-15
Author(s):  
Mohammed Alktranee
Keyword(s):  
Thermophysical Properties ◽  
Base Fluid ◽  
Volume Fraction ◽  
Working Fluid ◽  
Spectral Filter ◽  
Thermal Systems ◽  
Cooling Fluid ◽  
Numerical Studies ◽  
The Impact ◽  
T System

This paper appears potential of use nanofluids as a working fluid with the photovoltaic/thermal (PV/T) systems as an alternative of the conventional liquids in improves the efficiency of the hybrid PV/T system. The review highlights the impact of some parameters (base fluid, volume fraction, the concentration of nanoparticles, surfactants, shape, and size of nanoparticles) on nanofluids' thermophysical properties and their effect on the PV/T system's efficiencies. Hence, it discusses the PV/T behavior, which uses different nanofluids based on previous experimental, analytical, and numerical studies. The review concluded that using nanofluid as a cooling fluid or spectral filter contributes by enhancing the performance and increasing the PV/T system's efficiency. Thus, each type of nanofluids has certain features that contribute to removing the PV cells' excess heat by cooling it, contributing to its work's stability, and increasing its productivity. Nanofluids thermophysical properties play an intrinsic role by enhancing nanofluids' performance, thus positively reflecting on the PV/T system's performance. Despite the variation in the values of thermal and electrical efficiency, Most of the studies that used nanofluids have achieved encouraging results that appeared by improving the performance of PV/T systems.

scholarly journals Numerical simulation and experimental research of cavitation nozzle based on equation curve

2021 ◽  
Author(s):  
Lifu Wang ◽  
Dongyan Shi ◽  
Zhixun Yang ◽  
Guangliang Li ◽  
Chunlong Ma ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Reynolds Number ◽  
Flow Field ◽  
High Speed ◽  
Quadratic Equation ◽  
Outer Contour ◽  
Study Results ◽  
Fluent Software ◽  
The Impact ◽  
Better Than

Abstract To further investigate and improve the cleaning ability of the cavitation nozzle, this paper proposes a new model that is based on the Helmholtz nozzle and with the quadratic equation curve as the outer contour of the cavitation chamber. First, the numerical simulation of the flow field in the nozzle chamber was conducted using FLUENT software to analyze and compare the impact of the curve parameters and Reynolds number on the cleaning effect. Next, the flow field was captured by a high-speed camera in order to study the cavitation cycle and evolution process. Then, experiments were performed to compare the cleaning effect of the new nozzle with that of the Helmholtz nozzle. The study results demonstrate that effective cavitation does not occur when the diameter of the cavitation chamber is too large. For the new nozzle, with the increase of the Reynolds number, the degree of cavitation in the chamber first increases and then decreases; the cleaning effect is much better than that of a traditional Helmholtz nozzle under the same conditions; the nozzle has the best cleaning effect for the stand-off distance of 300 mm.

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