A vibration suppression technique for lightweight and flexible membrane structures is proposed using smart structure technology with a dielectric elastomer actuator (DEA). DEA, which polynomial material large deformation high response time, can easily be applied to over wide frequency range. Herein, active control DEA examined. non-contact excitation system high-power Nd:YAG pulsed laser precisely measures the responses of structures. laminated fabricated attached surface, generating highly...

Abstract This study proposes an active vibration control technique for pipe structures using dielectric elastomer actuators (DEAs). Vibrations in must be eliminated to improve their mechanical reliability, and techniques can applied effective suppression. Soft actuators, which completely fit with complex-shaped surfaces, are required transfer reduction forces the target. DEA is suitable this kind of target structure because characterized by high stretchability, flexibility, large...

To realize a vibration suppression of flexible structures like membrane, our research focuses on introducing smart technology into the membrane structure. In this study, structure is composed control system using Polyvinylidene fluoride (PVDF) film as an actuator. A non-contact test system, which uses high power Nd: YAG pulse laser for producing ideal impulse excitation and Doppler vibrometers measuring response employed to evaluate characteristics confirm effectiveness proposed method, PVDF...

This study proposes a vibration technique based on the dielectric elastomer actuator (DEA) excitation to determine resonance frequency of La France pear fruit. Postharvest fruit ripen during storage improve their quality. A non-destructive measurement is necessary predict maturity without damaging The correlated with firmness, which can be assessed by firmness index derived from and mass. Because DEAs exhibit characteristics that are conducive applications such as flexibility, lightweight,...

In hot rolling, lubrication between the work roll and strip plays an important role in reducing rolling force protecting surface. However, tribological behavior has not been clarified sufficiently. this work, effects of oil amount on coefficient friction were investigated comparison with case cold rolling. The was measured by remaining surface after results tests following points: is reduced adequately a small oil. If increased, few oil-pits will form, but no further decrease be achieved. It...

A new method of rolling T-bars using a common universal mill for H-beams was investigated. To study its deformation properties, model experiments and finite element analyses were carried out. Before the experiment, there concern about large side camber rolled due to asymmetric section shape in rolling. However, it shown that could be controlled by adjusting balance web flange thickness reductions. The spreading behavior then studied detail numerical simulations. Linear relationships between...

In hot rolling, lubrication between the work roll and strip plays an important role in reducing rolling force protecting surface. However, tribological behavior has not been clarified sufficiently. this work, effects of oil amount on coefficient friction were investigated comparison with case cold rolling. The was measured by remaining surface after results tests following points: is reduced adequately a small oil. If increased, few oil-pits will form, but no further decrease be achieved. It...

A vibration experiment technique based on a dielectric elastomer actuator (DEA) excitation for apples is proposed. The characteristics of DEAs such as flexibility, lightweight, large deformation, and fast response are conducive to applications. Moreover, composed soft rubber-like materials should be compatible with diverse objects. They can applied structures curved surfaces transfer forces effectively. Herein, an agricultural application, DEA assess the quality apples, which have spherical...

In rolling of ultra thin stainless steel foil, there are two limits. One is owing to elastic deformation work rolls, and the other edge crack rolled foil. this paper, fundamental investigation was conducted about basic characteristic limits The influence several conditions on minimum thickness behavior were investigated experimentally. This paper provides new formula predict in foil rolling. relation between depth also discussed. expands with passes. However, degree at same shows different...

Universal rolling of channel sections has various advantages in both productivity and product quality. However, research on deformation universal appears to be inadequate. In particular, the effect conditions such as thickness reductions behavior is still unknown. To investigate influence detail, a model experiment finite element analyses were conducted. The results showed that flange spread displays linear relationship against reduction balance, which was defined difference web strains....

In rolling of ultra thin stainless steel foil, there are two limits. One is owing to elastic deformation work rolls, and the other edge crack rolled foil. this paper, fundamental investigation was conducted about basic characteristic limits The influence several conditions on minimum thickness behavior were investigated experimentally. This paper provides new formula predict in foil rolling. relation between depth also discussed. expands with passes. However, degree at same shows different...

The formation mechanism of edge-seam defects at the edges hot-rolled strips ferritic stainless steel was examined experimentally using a stainless-steel slab and crystal plasticity finite element analysis. Wrinkles in rolled occur owing to differences deformation between coarse grains formed orientation rotation as reduction ratio increases, determined on basis anisotropy with random orientations that were during heating. In initial stage hot rolling, depth wrinkles increases diameter such...

As a technology to manufacture fine-grained steel, accumulative bending process after hot rolling was proposed, and multi-bending equipment of laboratory scale were established. The effects on microstructure ferrite grain size by changing the thermomechanical conditions investigated. results, with 2.2μm obtained at specimen surface in optimized thermal condition. By results FE analysis, it cleared that equivalent strain accumulated not only but also center thickness.

Three dimensional numerical analysis model of thermal stress and deformation slab in reheating furnace was constructed. Using this model, temperature distribution, 36%Ni–Fe alloy showing the unique expansion property, called “Invar ally”, were simulated. During reheating, surface part is always a high compared with internal portion. The difference between center parts causes expansion, acts on each slab. magnitude direction vary accordance plastic through phase. Tensile can be generated...

As a technology to manufacture fine-grained steel, accumulative bending process after hot rolling was proposed, and multi-bending equipment of laboratory scale were established. The effects on microstructure ferrite grain size by changing the thermo-mechanical conditions investigated. results, with 2.2 μm obtained at specimen surface in optimized thermal condition. By results FE analysis, it cleared that equivalent strain accumulated not only but also center thickness.

A study has been made of the development {111} grains through annealing at slow heating in 1% Cu-bearing steels with two carbon levels, 0.04% and 0.002%. At early stage recrystallization, Cu precipitates 0.002%C steel disperse very finely compared that 0.04%C steel. These fine strongly inhibit recrystallization both {001} grains, resulting weak textures sheet. Comparatively coarse will allow to recrystallize easily, recrystallized grow into unrecrystallized later finally strong texture is...

Three dimensional numerical analysis model of thermal stress and deformation slab in reheating furnace were constructed. Using this model, temperature distribution, 36%Ni–Fe alloy showing the unique expansion property, called "Invar alloy", simulated. During reheating, surface part is always a high compared with internal portion. The difference between center parts causes expansion, acts on each slab. magnitude direction vary accordance plastic through phase. Tensile can be generated during...

In a study of the deformation behavior stainless clad steel resulting from difference in flow stress between hot and mild at leading tail ends, effects various rolling conditions on alteration mild-steel protrusion were evaluated by experimental two-dimensional FEM analysis. The analytical results showed that end is reduced when using rolls with different diameters lubricated comparison under equivalent roll diameters, velocities, non rolling, because former promote uniform end. On other...

In hot rolling, lubrication oil plays an important role in reducing rolling force and protecting the work roll surface. However, behavior has not been clarified sufficiently. this work, a numerical analysis of introduced film was attempted. There are no previous reports on lubrication. The analytical results thickness showed good correlation with experimental results. following points: did become saturated even if increased. reason for phenomenon is thought to be because viscosity remains...

The effects of the ridge length and angle various convex anvils on concave shape formed at side a lead plate after width pressing bulging deformation behavior that occurs during rolling were investigated experimentally using model three-dimensional FE analysis. control edge-seam defects was then studied under condition increasing amount pressing. On basis results, it is clear depth slab sides can be increased by shortening controlled adjusting anvil angle. A rectangular hot-rolled bars...

Thermal histories in multi-bending process after hot rolling were clarified by numerical analysis. Temperature vibrates cyclically at strip surface, whereas relatively small vibration can be seen center thickness. Transferring speed and cooling condition characterize temperature distributions In industrial production, water-cooling equipments would necessary order to cancel heat generation during bending deformation maintain appropriate range.

In hot rolling, lubrication oil plays an important role in reducing rolling force and protecting the work roll surface. However, behavior has not been clarified sufficiently. this work, a numerical analysis of introduced film was attempted. There are no previous reports on lubrication. The analytical results thickness showed good correlation with experimental results. following points: did become saturated even if increased. reason for phenomenon is thought to be because viscosity remains...

The thermal histories of steel strips in a multi-bending process after hot rolling were clarified by numerical analysis order to investigate the appropriate conditions for grain refinement. temperature oscillates cyclically at strip surface, whereas amplitude is relatively small center thickness. distribution thickness direction depends on transfer speed and cooling conditions, that is, air or water cooling. In industrial production, water-cooling equipment would be necessary cancel...