نتایج جستجو برای: coil spring
تعداد نتایج: 75417 فیلتر نتایج به سال:
introduction: traumatic arteriovenous fistula (avf) called to an abnormal relationship between artery and vein which occurs in 10% of arterial traumas. if treatment of avf due to trauma delayed, different outcomes including heart failure, varices and varicose ulcers may accure. in case of chronic traumatic avf, open surgery may lead to remarkable outcomes, presence of many lateral veins and var...
pulmonary arteriovenous malformations (avms) are rare vascular malformations of the lung that usually led to a notable risk of serious and life-threatening complications. there is considerable debate about the best management of strategies for the group of patients with diffuse avms. several therapeutic options have been reported for management of this abnormality among which coil embolization ...
In this article, an innovative supervision system will be proposed that can observe and analyze health of Circuit Breaker’s trip coil. The proposed design also logs changes in the coil's quality and informs network supervisor in case of Circuit Breaker (CB) failure. This system injects small direct currents to the Circuit Breaker connections and the trip coil to compute CB’s health and characte...
Helical coil heat exchangers are widely used in industrial applications ranging fromcryogenic processes, air-conditioning, and nuclear reactors to waste heat recovery due totheir compact size and high heat transfer coefficient. In this kind of heat exchangers, flowand heat transfer are complicated. This paper reports a numerical investigation of theinfluence of different parameters such as coil...
A theoretical study of the stress-strain state helical cylindrical compression springs used in suspension vehicles during shot peening is carried out. The front spring studied by mechanical-mathematical methods and deformation theory plasticity, particular, method small elastic-plastic deformations. It established that reduces pre-stressing 2.54% due to an increase torque cross section coil 4.3...
This paper studies the dynamic modeling method of fold-able multi-body aircraft based on dynamics theory system. Considering as a complete multi-rigid body system, model for free unfolding process after horizontal launch is established. On basis model, coil spring moment and damping flexible connection between flight units are added. Taking certain type three-section wing an example, numerical ...
At the field of nanometer positioning and machining, high-precision tracking is a key technology micro-positioning platform which driven by voice coil motor. To improve accuracy response speed, sliding-mode active disturbance rejection control proposed. The mathematical model system established, in perturbation spring-damping force are set as unknown terms, an extended state observer used to es...
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