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Recently, coastal city and facilities had many damages by abnormally high waves with climate change. Especially, breakwater systems based on a caisson-type harm damages in Korea because they are located in the outside port. In order to reduce theses damages, new type breakwater systems using interlocking caisson are researched. Generally, caissons of breakwater system were constructed on crushed rock...
Aiming at the impact damage of transmission steel structure tower coating in Xinjiang, the dynamic impact mechanics behavior of transmission steel structure tower coating under simulated single particle impact was studied by automatic sphere impact tester and digital image correlation experiment measuring system. The three-dimensional morphological features of impact damage were analyzed by laser...
Serious sealing problems cause premature retirement of Lithium-ion punch cells in the service stage. This paper mainly investigates the sealing failure behavior of Li-ion punch cell. A non-linear peeling model was established with experimental verification to explain the failure behavior of sealing cohesive zone. Based on the peeling model, a sealing life prediction method is proposed by describing...
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 article presents the design and construction of a mechanism for emulating load forces caused by the road conditions and friction over an electric power assisted steering (EPAS). This mechanism uses extension springs and a rack-and-pinion mechanism to emulate these load forces. The purpose of devising this mechanism is to build an EPAS system test bench, that allows observing and testing the operation...
ICs bonding reliability at High Temperature (HT) application is considered. Namely results of investigations of bond ball lift failure mode category at post HT stresses Wire Bond Pull (WBP) tests for AlAu intermetallic interface at Tamb>150degC are presented in submitted paper. Simplified model of reliability risk assessment on the base of impact of such input factors as application temperature,...
The objective of this paper is to improve the fatigue life of a contact spring pin in a 126 kV vacuum circuit breaker (VCB). Firstly, the fatigue life of the contact spring pin during the opening or closing operation of the 126kV VCB is analyzed. Secondly, an orthogonal experimental method is used for the improvement of the fatigue life of the contact spring pin, in which three impact factors are...
In this paper, we proposed a sensor structure that can be used to measure the tactile force of robot fingertip. The structure of the sensor was composed of a cylinder-shaped finger and a circular base. First, we analyzed the relationship between the contact position and the stress with elastic mechanics theory. Then the corresponding spline curve algorithm was designed to calculate the contact position...
A method utilizing one Phase-shifted Fiber Bragg Grating (PS-FBG) and adaptive particle swarm optimization (APSO) algorithm has been proposed to simultaneously measure the spatial multiple axial stresses, including axial stress and transversal stress. The swarm success rate based dynamic adaptive strategy for the adjusting of inertia weight has been introduced to balance the exploration and exploitation...
Side reservoir can improve electromigration (EM) lifetime of copper interconnects. In this work, finite element method (FEM) simulations for interconnect structures with cathode end-of-line reservoir and side reservoir respectively have been conducted to study the side reservoir effects on EM lifetime. It is demonstrated that side location is most likely to have void failure and side reservoir can...
In this paper, the force analysis of the blade roller of the tiny cultivator is described firstly. The static analysis of the blade is carried out by using the Simulation plug of SolidWorks, and the data of von mises stress, resultant displacement, equivalent strain and safety factor of the blade are obtained. Then the modal analysis of the blade roller is carried out, and the data of the top ten...
This paper discusses the crack problem of band width in a semi-infinite plane, we refer to the singular integral equation theory to this problem and transform the boundary conditions into the boundary value problem of analytic function. Thus the problem can be transformed into the singular integral equations of Cauchy problem. Then by a series of operations, the problem becomes a singular integral...
In the operation of bulldozer, the working device bears various complex loads, which raise higher demands on the rationality of the structural design, the convenience of the operation, the durability and the reliability of the working device. The finite element method is used to analysis the structural strength and the fatigue life of the working device. The dangerous points, stress, strain distribution...
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...
High speed repulsion mechanism is the key component of Hybrid DC circuit breaker, whose properties and reliability directly determine whether the fault short-circuit current can be quickly broken off. The driving force, produced by the eddy current effect, reach tens of kilo Newton in 100μs, which means the huge impact on motion component. Due to its characteristics, it is necessary to check the strength...
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....
The tensile testing machine was constructed for determination of true stress and strain of carbon steel and image processing technique was proposed to detect a projection diameter of the specimen for actual area calculation. The main components of the tensile testing machine consists of a hydraulic cylinder and a hydraulic unit to proceed the tension force, upper and lower grippers to clamp the specimen,...
This paper presents the design and testing of a high force linear fine-tooth iron-core permanent magnet motor. We present the design and experimental results in comparison with a commercially-available iron-core linear motor. Our new fine-tooth motor shows predicted shear stress improvements of 28 % at the prototype practical power level of 10 W/mm and 85 % at an anticipated ultimate root mean square...
The behavior of vibrating crystal plates under the action of external forces was studied. The plates were respectively subjected to diametrical compression force and bending force in different configurations: (a) a clamped cantilever, (b) a cantilever with displaced knife edges, and (c) a dual support mounting with displaced knife edge applied midway between. Finite element models were developed using...
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