Cantilever can apply something4 answersCantilevers can be utilized for various applications such as sensing, temperature measurement, and even actuation. Cantilever-based sensors have shown promise in detecting proteins, DNA, antigens, and more biological targets. Additionally, cantilever beams have been employed as highly sensitive temperature sensors, where the deflection of the beam due to temperature changes can be measured. Moreover, cantilevers can be used for actuation purposes, as demonstrated by the creation of a millimetric-sized cantilever from a photo-driven azobenzene polymer that can oscillate under laser radiation. Therefore, cantilevers can indeed apply various functions ranging from sensing to actuation, making them versatile tools in different fields of research and technology.
Cantilever erection method for steel truss bridge5 answersThe invention provides various methods for cantilever erection of steel truss bridges. Wang et al. propose a method involving the construction of a pier abutment, erection of steel trusses, and the use of adjusting devices for accurate pier-loading and closure. Zhu et al. present a multi-width juxtaposed double-cantilever bridge girder erection machine that allows for simultaneous erection of multiple frames and reduces via hole bending moment. Gao et al. describe a cantilever assembling construction method for multi-main truss steel truss structures, ensuring alignment of the bridge deck. Cui et al. propose an erection method for cable-stayed bridge steel truss girders, which improves construction efficiency and reduces project cost. Chen et al. introduce a cantilever light steel pedestrian truss bridge connecting system based on a stay cable structure, enhancing stability, bearing capacity, and pedestrian comfort.
What are flow-induced energy harvesting devices?3 answersFlow-induced energy harvesting devices are devices that convert the energy from fluid flow into usable electric energy. These devices utilize various mechanisms such as piezoelectric transducers, carbon-based materials, and buckled sheets to harvest energy from flow-induced vibrations or the redistribution of charges at the liquid/solid interface. They can be used in applications such as water flow or evaporation energy harvesting, as well as in the development of Internet of Things devices. However, there are still challenges in this field, including the need for better handling of the multi-physics coupling problem and improving the robustness of the energy harvesters. Future development in this direction may involve the use of machine-learning approaches, metamaterials, and advanced interface circuits.
What is Flow Induced Vibration?5 answersFlow-induced vibration refers to the structural and mechanical vibration of objects immersed in or conveying fluid. It occurs when the dynamic forces of the fluid interact with the inertial, damping, and elastic forces of the structures. These vibrations can be observed in various engineering systems and can lead to instabilities and damage. Flow-induced vibrations can be caused by factors such as multiphase flow and momentum fluctuation, and they are a complex phenomenon that is still not fully understood. Researchers have been studying flow-induced vibrations to develop a deeper understanding of their effects and to find ways to mitigate them. Flow-induced vibration energy harvesters have also been proposed as a means of converting the energy from flow-induced vibrations into usable energy. Overall, flow-induced vibration is an important phenomenon in fluid-structure interactions that has implications for various engineering applications.
Cause of Flow Induced Vibration?5 answersFlow-induced vibration (FIV) is the structural and mechanical vibration of structures immersed in or conveying fluid. Vibration of nuclear power plant components can cause fretting wear and fatigue that can eventually lead to component failure. The current work investigates flow-induced vibrations of piping structures with flow restricting orifices due to separated two-phase flow. Structural vibrations caused by a flowing fluid can occur when a structure is exposed to a flowing fluid. The flow-induced vibrations of a circular cylinder, free to oscillate in the cross-flow direction and subjected to a forced rotation about its axis, are analysed by means of two- and three-dimensional numerical simulations.
What are the 4 different flow induced vibrations mechanisms?3 answersFour different flow-induced vibration mechanisms have been identified in the abstracts. These mechanisms include instability-induced vortex-formation processes, movement-induced wake and shear-layer breathing modules, fluidelastic instability, and periodic wake shedding.These mechanisms are responsible for the streamwise vibrations observed in various cylindrical and axisymmetric bodies, as well as plates with flow underneath.The excitation mechanisms in two-phase flow-induced vibrations include fluidelastic instability, phase-change noise, random excitation, and periodic wake shedding.These mechanisms can induce small-amplitude subcritical oscillations and large-amplitude dynamic instabilities in components subjected to two-phase flow.