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To investigate the seismic behavior of prefabricated segmental bridge column with hybrid system (HSC), an elaborate model of was established based on OpenSees platform. The joint between the column and pile cap in the analytical model was constructed with zero-length elements considering the bond-slip effect. The analytical results of the numerical model were carefully compared with the previous test...
Limited travel constrains the widely application of XYZ parallel micro/nano-positioning stage. In this paper, a novel parallel-kinematics micro/nano-positioning stage is proposed with the goal of enlarging the travel range. In order to obtain a large input displacement for actuating the stage, voice coil motors (VCM) are adopted. For a large-travel parallel stage, the cross-axis motion increases the...
This paper presents a study on the behavior of dual buildings in seismic areas. The structure analyzed here is composed of a masonry walls core surrounded by reinforced concrete frames. It will be built in Bucharest, Romania. Masonry can be used in seismic areas as infills for framed structures or as bearing walls. Buildings need the shape and rigidity distribution to minimize the effects of torsion...
The paper presents a study about the effect of masonry infill walls on the behavior of framed buildings, in seismic areas. The study was done for a building that will be built in Bucharest, Romania. In this case, the building will have 6 stories. The bays are narrow, because of the architecture requirements. The structure is composed of concrete frames. The masonry infill walls may assure an enhanced...
The circuit breaker is an important part of control and protection in the power system. Mechanical failure is the main fault of circuit breakers, and the loosening of fasteners is one of the typical mechanical faults. The self-loosening of bolted joints is closely related to the vibration, especially transverse vibration. There is strong vibration while the circuit breakers are opened and closed....
Using the equations of compatibility of deformation and equilibrium between the turns of the threaded connection solved the problem of load distribution in the turns of the thread. Based on the selection of the turns of the screw and nut with different pitches of effective design-technological method enabling to align the load distribution between turns and thereby increase the durability of threaded...
This paper introduces an inductor magnetic lead screw (IMLS) for simplify the structure of magnetic lead screw (MLS). The IMLS is formed on the basis of reluctance MLS with toroidal windings on both sides of the screw. The windings are assigned by dc current of reserved direction to produce magnetic flux through the air gap. The degree of freedom of the nut and screw is limited to avoid the brush...
This paper proposes a right-circle flexural hinge design for enlarging the displacement of bridge-type mechanisms as an alternative to the commonly used inner output type. The proposed design uses the outer side as the output so that it is suitable for some engineering applications with output force. Based on the elastic beam theory, a formula for the right-circle displacement amplification ratio...
Structural Health Monitoring (SHM) provides a comprehensive assessment of structural state and damage based on monitoring structural parameters. It has definite practical significance in extending the service life of the structure, reducing the maintenance cost and improving the safety and reliability of the structure. In recent years, there were many aircraft faults founded in the aileron control...
The development of microscale surgical tools could pave the way for truly minimally invasive microsurgical procedures. This work demonstrates the application of direct laser writing (DLW) using two-photon polymerization (TPP), a rapid prototyping microfabrication technique, to create a tethered, passively actuated three-dimensional gripper with potential applications in microbiopsy. A microgripper...
The position tracking control problem of electrical cylinder in the presence of nonlinear friction load, inertia load and nonlinear disturbance due to its transmission process is addressed in this paper. To compensate all of these disturbances in the case of servo motion, active disturbance rejection control is used to make a continuous and precise transition. Tracking differentiator is used for arranging...
This paper presents the wave tank test results on an innovative system for converting mechanical energy from waves directly to electricity. It consists of a point-pivoted buoy that oscillates in presence of waves and a ball screw based electro-mechanical generator. A damping force was applied for the system control by connecting the generator to an electrical load. The numerical model of the complete...
It is a characteristic features of anthropomorphous technology development at its current stage to be promoted from the sphere of production to the social life. The anthropomorphic robots have a particular place nowadays because they are capable of not only interacting with a human being but also fulfilling its actions in adverse conditions. The structure analogous to the human skeleton allows realizing...
Piezoelectric materials are an attractive option for electromechanical transduction on the mesoscale due to their intrinsic high force production, large bandwidth, and favorable scaling characteristics. However, the small displacements they inherently produce are typically too small to be directly used in robotic systems, and thus displacement amplification is needed. Here we present a piezoelectric...
This paper presents the fabrication and characterization of a mechanical microswitch structures for the out-of-the plane displacements. The mobile electrode is connected to the anchors through several rectangular hinges fabricated in different geometrical dimensions. The mechanical response of investigated switch structures depends on the number of hinges and their geometrical dimensions. The geometrical...
The steel high-tension bolt of hexagon head is used in the engine of an automobile or a motorbike. In the manufacture process of these engines, the slack inspection of the bolt is very important.
This paper presents an electroactive polymer (EAP) actuator controlled scissor-type gripper (Fig. 1). The EAP actuator is made of ion polymer metal composite (IPMC). By doping Fe2O3 nanoparticles into IPMC, the actuator exhibits larger force output and 2-fold increase of maximum deformation compared to the pure IPMC actuator. Using water retaining poly(N-isopropylacrylamide) (PNIPAAM) made water supply...
Traditional mechanical systems (e.g. rigid mechanisms which use links, gears, chains, etc.) have restricted resolution and repeatability due to certain properties like friction and backlash. A mechanism is a mechanical system which provides relative displacement between rigid links by using certain joints. Commonly available joints are rolling, sliding, pin, hinges, liquid joints etc. These types...
A passively self-aligned, assembly-based process for rapidly creating compact, micro-barrel hinges with unconstrained rotation from SU-8 epoxy is presented. The alignment process takes places in two stages: a coarse alignment stage guided by external dowel pins followed by a fine alignment stage driven by the hinges' features themselves. The assembly of pins into housings circumvents the design rules...
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