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Online since: November 2012
Authors: Min Guo, Lu Lei, Xi Ping Zhang
Essentially, the current loop contains a internal feedback loop of the object properties from the control signal to the armature current, and the loop is applied to reduce the effect of the bad linearity of various components.
The system selects DC motor mostly, and the mechanical characteristic of the DC motor is very soft, therefore the velocity loop is an integral part of a loop.
In theory, the speed error factor of second-order correction is infinite, so there is no speed lag, but the system stability is bad and acceleration lag is relatively high.
But the linear integrator is a link with a phase lag of 90°, therefore it affects the system dynamic performance and stability of the system.
Online since: November 2018
Authors: Lena C. Altherr, Marc E. Pfetsch, Philipp Leise, Andreas Schmitt
This property holds in our context, if the system still fulfills the minimum requirements after the (complete) failure of K arbitrary pumps.
Finally, for an example building, we compute optimal solutions with buffering capacity K for K = 1, 2, 3 and evaluate their properties with respect to pump failures.Mathematical Model We first present a mathematical model that allows to compute an optimal placement of pipes and pumps as well as the optimal operation of pumps to supply a high-rise building with fresh water in a static case.
To investigate resilience, we compute the solutions of a real-world application for different resilience factors K.
Compared to the optimal solution, the resilient topologies are less affected by deviations of the demand distribution.
For other λ, the critical zone changes and is also connected to pumps whose flow is affected by λ.
Online since: December 2012
Authors: Ming Qin, Ning Xie, Hui Wang, Kai Zhang, Dong Xiang, Xue Ping Liu
Introduction Gear rattle arises from gaps and multi-valued stiffness elements in typical gear drivetrain, particularly, under the impact of torsional vibrations and it can seriously affect the dynamic performance of the gear transmission, and reduce the life of the gear.
In the analysis of gear rattle, stiffness and damping coefficient is the direct impact factor of rattling.
[7] Dong Haijun, ShenYunwen.InvestigationofRattling ThresholdinGear System.Chinese Journal of Mechanical Engineering, 2005(4): p. 571-574
Journal of Mechanical Strength,2003,25(4):373-377(in Chinese)
The Linear Approximated Equation of Vibration of a Pair of Spur Gears (Theory and Experiment),ASME JOURNAL OF MECHANICAL DESIGN, June,1994, Vol. 116, pp. 558-564.
Online since: August 2016
Authors: Vera Pelantová, Lenka Kretschmerova
They deal with properties of various materials (for example the strength of the material) during of solving of tasks, with the functionality of a whole equipment, but also with a cost optimisation.
The situation is an even worse that a broad spectrum of tasks from different fields that relate to a range of jobs within the national economy, is affected.
The copper has a good electrical conductivity and it is a good for a mechanical processes.
The wood as a material has better mechanical properties (as solid) than plastics and it is a less brittle.
The alternatives of materials are seek continuously with regard to the safety, material properties and cost.
Online since: August 2022
Authors: Sri Juari Santosa, Nuryono Nuryono, Fina Nur Aisyah, Muhammad Hadi
This difference may be caused by variation on the mineral composition of sugarcane that is affected by the characteristic of soil origin.
Medium pH is an important factor for the process of removal because it affects the stability of the adsorbent, charge intensity of the surface of adsorbent and also the ionization degree of the removed species.
Saxena, Evaluation of mechanical properties of concrete manufactured with fly ash, bagasse ash and banana fibre, Mater.
Muda, The properties of special concrete using washed bottom ash (WBA) as partial sand replacement, Int.
Online since: December 2009
Authors: Ehab El-Danaf, Tarek M. El-Hossainy
El-Hossainy 2b 1 Mechanical Engineering Dept.
The understanding of these precipitation mechanisms during artificial aging is critical for achieving optimal properties.
Also, to investigate how aging treatment affects the strain hardening response of the 6082 material aged to different conditions and subjected to post aging plastic deformation via different stress states, namely, simple compression (SC), simple shear (SS) and plane strain compression (PSC).
In PSC, Leffers and Sorenson [7] proposed that the rotation of the {111} planes to approximately being parallel to the rolling plane increases the Shmidt factor tremendously, which makes homogeneous slip on these planes extremely difficult thus promoting inhomogeneous deformation through shear bands.
Online since: September 2018
Authors: Yuri V. Ivanov, Yuri F. Rogatnev, Igor I. Ushakov
The reinforcement factor was μs=0.0105.
The constructions of the experimental CFRP beams and further arrangements related to the strain gauges T1...T12: a. lengthwise cut; b. cross-section Strength properties of the materials used.
Mechanical characteristics of the canvases were defined on the basis of the results of testing carbon fibers strips jointed by the SikaDur®-330 epoxy glue, which was used for gluing strengthening elements to the beams.
Strengthening the reinforced concrete beams by the CFRP leads to an increase in flexural rigidity of beams, which affects the amount of deflections before and after crack formation.
Online since: December 2024
Authors: Soon Ki Jeong
The increased size and uniformity of the nucleation sites observed in the heat-treated samples indicate that thermal treatment enhances the structural properties of the lithium surface, making it more conducive to the formation of a stable SEI.
The pronounced changes in the morphology of the lithium surface suggest that thermal treatment not only affects the physical structure but also potentially alters the chemical composition of the surface, which could improve interaction with the electrolyte [11-12].
The uniform distribution and increased size of nucleation sites after thermal treatment likely contribute to the overall stability of the SEI, reducing the risk of dendritic lithium formation, which is a critical factor in the safety and longevity of LMBs.
This improved interaction is crucial for preventing dendritic lithium growth and maintaining the mechanical integrity of the SEI during cycling, ultimately enhancing battery safety and performance [15-16].
Online since: September 2011
Authors: Zhong Hai Yu
Diffusion Channel of Generic Technology in Equipment Manufacturing Industry Zhong Hai Yu1, 2, a 1 Economic and Management Institute, Yanshan University, Qinhuangdao, China 2 Institute of Mechanical Engineering, Shanghai Dianji University, Shanghai, China aydzh66@yahoo.com.cn Keywords: Equipment manufacturing industry, Generic technology, Technology diffusion Abstract.
Technology products are influenced by not only technical economic level but also management system and many other factors, when spreading to the recipient.
Purchase Independent intellectual property rights, or purchase core agencies to get the proprietary intellectual property rights.
Innovations are often shared with other companies in the process, in fact, intellectual property rights are partly transferred.
Produce high-end digital design and manufacturing softwares with independent intellectual property.
Online since: June 2023
Authors: Abdulbaqi Jinadu, Oluwatomiwa John Odenibi, Joshua Daniel, Volodymyr Koloskov, Dmytro Tiniakov, Olalekan Adebayo Olayemi
This could arise from an urgent medical emergency or a mechanical failure that could exacerbate in the long run.
However, past CFD studies demonstrate that overall simulation of 2D does not affect the accuracy [8].
The convergent and divergent nozzle analysis is carried out in ANSYS to compute flow properties like density, pressure, velocity, and temperature.
Fig. 8: A typical gas ejector (ESDU A9242) A (k-epsilon) model of turbulent flow The K-epsilon (k-ε), a two-equation model of turbulence, is employed mostly in computational fluid dynamics (CFD) to simulate average flow properties for turbulent flow conditions.
In comparison with previous models, this one hinges on the mechanisms that affect the turbulent kinetic energy.
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