Vibration Control of Magnetorheological Elastomer Beam Sandwich

A Magnetorheological Elastomer (MRE) is a smart material and that could change their properties by exposure to stimuli such as electric and magnetic fields, stress moisture and temperature. Objective of this research is to develop a MRE as vibration isolator of a beam sandwich under different currents to get different stiffness of the MRE. A MRE was fabricated by mixing silicon rubber, silicon oil and carbonyl iron particles together and then cured for 24 hours in a circular mold. Experimental result shows that that there were decreases in amplitude of the vibration in time and frequency domains when the current applied to the coil is increased

Magnetorheological Elastomer Stiffness Control for Tunable Vibration Isolator

Most of the vibration isolator has fixed stiffness such as passive vehicle mounting system. Objective of this research is to develop a Magneto-rheological Elastomer (MRE) as a vibration isolator when different currents are applied to get different stiffness of the MRE. A MRE was fabricated by mixing silicon rubber, silicon oil and carbonyl iron particles together and then cured for 24 hours in a circular mold. Experimental result shows that that there were decreases in amplitude of the vibration in time and frequency domains when the current applied to the coil is increased

Waste tire rubber based magnetorheological elastomers

The High-Pressure High-Temperature (HPHT) sintering is an established process for reclaiming Waste Tire Rubber (WTR) into Magnetorheological Elastomers (MREs). Even though the WTR is generally recycled to other products, the usage of WTR as the main matrix of MRE is a new and novel concept. Therefore, this research focuses on studying the physicochemical and viscoelastic properties of the WTR based MRE produced through HPHT process. The WTR, carbonyl iron particles, and additives were mixed and compacted by applying simultaneous temperature and pressure at 200oC and 25 MPa, respectively. Swelling test, morphological examination, infrared spectroscopy, magnetization, and thermal analysis were among the physicochemical properties studied. Meanwhile, the magneto-induced viscoelastic properties were assessed through shear mode test in both steady and dynamic conditions. The highest degree of reclamation based on swelling test, achieved up to 54 % confirming that crosslinking occurred during reclamation process. The dispersion of the magnetic particles were examined through Scanning Electron Microscopy (SEM) and the morphology of the fractured matrix indicated that the WTR blended well without any grain boundaries of uncured WTR. The highest magnetization saturation was achieved at 76.079 emu/g. While, the infrared spectroscopy identified rubber substances including synthetic and natural rubbers based on the band characteristics. Additionally, the thermogram patterns and decomposition rates of the samples also approved the matrix composition. The glass transition temperatures were also measured at -60.6 ±0.5oC showing conformity with the reclaimed pure WTR. The WTR based MRE achieved maximum static stress ranging from 9 to 13 kPa (at 700 mT) with Linear Viscoelastic (LVE) region above 3% strain amplitude. The MRE exhibited MR effect up to 24 % with the range of storage modulus between 0.6 to 0.74 MPa (at 700 mT). Based on the examination results, the WTR based MRE demonstrated acceptable physicochemical characteristics and presented outstanding viscoelastic properties for future potential applications of MREs

Waste tire rubber based magnetorheological elastomers

The High-Pressure High-Temperature (HPHT) sintering is an established process for reclaiming Waste Tire Rubber (WTR) into Magnetorheological Elastomers (MREs). Even though the WTR is generally recycled to other products, the usage of WTR as the main matrix of MRE is a new and novel concept. Therefore, this research focuses on studying the physicochemical and viscoelastic properties of the WTR based MRE produced through HPHT process. The WTR, carbonyl iron particles, and additives were mixed and compacted by applying simultaneous temperature and pressure at 200oC and 25 MPa, respectively. Swelling test, morphological examination, infrared spectroscopy, magnetization, and thermal analysis were among the physicochemical properties studied. Meanwhile, the magneto-induced viscoelastic properties were assessed through shear mode test in both steady and dynamic conditions. The highest degree of reclamation based on swelling test, achieved up to 54 % confirming that crosslinking occurred during reclamation process. The dispersion of the magnetic particles were examined through Scanning Electron Microscopy (SEM) and the morphology of the fractured matrix indicated that the WTR blended well without any grain boundaries of uncured WTR. The highest magnetization saturation was achieved at 76.079 emu/g. While, the infrared spectroscopy identified rubber substances including synthetic and natural rubbers based on the band characteristics. Additionally, the thermogram patterns and decomposition rates of the samples also approved the matrix composition. The glass transition temperatures were also measured at -60.6 ±0.5oC showing conformity with the reclaimed pure WTR. The WTR based MRE achieved maximum static stress ranging from 9 to 13 kPa (at 700 mT) with Linear Viscoelastic (LVE) region above 3% strain amplitude. The MRE exhibited MR effect up to 24 % with the range of storage modulus between 0.6 to 0.74 MPa (at 700 mT). Based on the examination results, the WTR based MRE demonstrated acceptable physicochemical characteristics and presented outstanding viscoelastic properties for future potential applications of MREs

Design and experimental testing of an adaptive magneto-rheological elastomer base isolator

Magnetorheological elastomer (MRE) is known for its field-sensitive shear modulus and damping property when it is exposed to a magnetic field. It has a great potential for the development of vibration reduction devices. Many research, mostly in mechanical engineering, have been focused on different kinds of vibration absorbers and vibration isolators, however few research addresses its potential in base isolation system in civil engineering application. The objective of this paper is to pilot the design and experimental testing of a novel device, an adaptive MRE base isolator, for the development of smart base isolation system. A large-scale design of the novel device with unique laminated structure of steel and MR elastomer layers is adopted. Detailed procedures on designing such adaptive base isolator are introduced. An innovative design on the magnetic circuit, with aim to provide strong and uniform magnetic field to the multi-layer MRES, is proposed to incorporate into the device design. Experimental investigation is conducted to examine its behavior under various cycling loadings when it is applied with different current inputs. Experimental results indicated that the force increase and the stiffness increase of the novel device are about 45% and 37%, respectively. To conclude, the MR elastomer base isolator will be a promising candidate to facilitate the development of adaptive base isolation system for civil structures. © 2013 IEEE

Shortest Route at Dynamic Location with Node Combination-Dijkstra Algorithm

Abstract— Online transportation has become a basic requirement of the general public in support of all activities to go to work, school or vacation to the sights. Public transportation services compete to provide the best service so that consumers feel comfortable using the services offered, so that all activities are noticed, one of them is the search for the shortest route in picking the buyer or delivering to the destination. Node Combination method can minimize memory usage and this methode is more optimal when compared to A* and Ant Colony in the shortest route search like Dijkstra algorithm, but can’t store the history node that has been passed. Therefore, using node combination algorithm is very good in searching the shortest distance is not the shortest route. This paper is structured to modify the node combination algorithm to solve the problem of finding the shortest route at the dynamic location obtained from the transport fleet by displaying the nodes that have the shortest distance and will be implemented in the geographic information system in the form of map to facilitate the use of the system. Keywords— Shortest Path, Algorithm Dijkstra, Node Combination, Dynamic Location (key words