budownictwo: Magnetorheological fluid

Evidence: 100 • authority: 72

A magnetorheological fluid (MR fluid, or MRF) is a type of smart fluid which, when subjected to a magnetic field, greatly increases in apparent viscosity, to the point of becoming a viscoelastic solid. Importantly, the yield stress of the fluid when in its active ("on") state can be controlled very accurately by varying the magnetic field intensity. The upshot is that the fluid's ability to transmit force can be controlled with an electromagnet, which gives rise to its many possible control-based applications. MR fluid is different from a ferrofluid which has smaller particles. MR fluid particles are primarily on the micrometre-scale and are too dense for Brownian motion to keep them suspen…

Evidence: 63 • authority: 72

A magnetorheological damper or magnetorheological shock absorber is a damper filled with magnetorheological fluid, which is controlled by a magnetic field, usually using an electromagnet. This allows the damping characteristics of the shock absorber to be continuously controlled by varying the power of the electromagnet. Fluid viscosity increases within the damper as electromagnet intensity increases. This type of shock absorber has several applications, most notably in semi-active vehicle suspensions which may adapt to road conditions, as they are monitored through sensors in the vehicle, and in prosthetic limbs.

Evidence: 55 • authority: 80

Yield stress of a magnetic fluid in a magnetic field

Evidence: 48 • authority: 80

Temperature field of the instrument for measuring the yield stress of magnetorheological fluid

Evidence: 48 • authority: 92

Study on viscosity time-varying law and microscopic chain forming mechanism of Fe3O4 magnetic slurry.. Complex and changeable engineering geological conditions pose major challenges to underwater construction. Slurry grouting under dynamic water conditions is difficult to regulate in real time, resulting in slurry loss and a low retention rate. This study develops a new type of magnetic grouting material based on materials science and electromagnetism, and examines the characteristics of slurry with different magnetic powder dosages. The relationship between shear stress and magnetic field strength was investigated using a rheological test. The magnetisation rate (χ) of the material was mea…

Evidence: 41 • authority: 80

Power saving magnetic field control for magnetorheological fluid using permanent magnet

Evidence: 41 • authority: 80

The application of a non-uniform magnetic field to semi-active vibration control of a beam with magnetorheological fluid

Evidence: 41 • authority: 80

A Magnetorheological Fluid Yield Stress Measurement Platform by Movable Permanent Magnet

Evidence: 41 • authority: 92

Magnetorheological Finishing Technology: Research Progress in Materials, Mechanisms, Equipment, and Intelligentization.. Magnetorheological Finishing (MRF) technology, as a deterministic machining method featuring flexibility, controllability, and extremely low subsurface damage, has become one of the most promising technologies in the field of ultra-precision polishing. This review systematically summarizes the research progress of MRF technology in aspects such as polishing fluid preparation and rheological properties, material removal mechanisms and theoretical models, classification and optimization of equipment and processes, multi-energy field hybrid technologies, and intelligent deve…

Evidence: 41 • authority: 72

A smart fluid is a fluid whose properties (e.g. viscosity) can be changed by applying an electric field or a magnetic field.

Evidence: 41 • authority: 72

Electrorheological (ER) fluids are suspensions of extremely fine non-conducting but electrically active particles (up to 50 micrometres diameter) in an electrically insulating fluid. The apparent viscosity of these fluids changes reversibly by an order of up to 100,000 in response to an electric field. For example, a typical ER fluid can go from the consistency of a liquid to that of a gel, and back, with response times on the order of milliseconds. The effect is sometimes called the Winslow effect after its discoverer, the American inventor Willis Winslow, who obtained a US patent on the effect in 1947 and wrote an article published in 1949.