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The paper, on the basis of the girder bridge in service as research object, puts forward the assessment methods of anti-seismic reliability degree in service structure. Firstly, the aging and damage factors of materials having happened in girder bridge in service is analyzed. Secondly, considering when the subsequent use of the bridge structure in service within the probability that can suffer seismic...
High Speed Cutting (HSC) is an advanced manufacturing process technology which develops rapidly in recent years. It is also an important orientation in machining technology. It has made significant economic benefits in aviation, aerospace, automotive, mold, high-speed locomotives and other industry applications. Therefore, far-reaching significance will be achieved in improving the level of processing...
Introduction of a three-axis variable elliptical trajectory equal-thickness screen, according to Lagrange principle to establish the dynamic equations and make kinematics simulation using MATLAB software. Get the motion trajectories, vibrating direction angle, amplitude and throwing index of different points on screen surface. Through the analysis of these several parameters can be drawn that, vibrating...
Numerical simulation is used widely in the field of geotechnical engineering, the paper used finite difference software FLAC3D to numerical simulate status of anchorage system, according to setting different material parameters grouting to simulate different defect in the anchor system. Numerical simulation of anchorage system in the case of characteristic frequency and typical vibration loading are...
Piezoelectric power generators employing piezoelectric materials to scavenge ambient vibration energy and provide micro electric energy for MEMS. In this paper, a model based on current equivalent circuit method to analyze electric generation characteristics of a cantilever piezoelectric power generator from low-frequency vibrations is put forward and used to discuss a prototype with experimental...
Action needs, cognitive needs and learning needs, which reflected mechanism usability, were selected as characteristic variables of system. Universality, stability and full-function were selected as factor variables. Absolute degree of incidence matrixes for system characteristic variables and factor variables were established. Influences of property parameters on mechanism usability were determined...
The paper introduces a method combining the calculating result of Ansys which is a emulating software of finite element theory with the dynamic test to obtain the characteristics of the assembled beams, this method have high reliability because the two ways can validate each other, so it is very useful for designing and optimizing the assembled structures.
The revolute outputs effected by the clearances of joints which are caused by the inaccurate precision of processing and error of assembly are analyzed at first, then in order to illustrate the problem the simulation of a kind of parallel mechanism named 3-PRUR is also done in Pro/E and Adams software. At last a kind of compliant revolute joint called split-tube flexural pivots based on the principle...
The vibrating screen is the important industrial equipment that is used to sort and clean the granular materials. Screening results of the granular materials is directly affected by working state of vibrating screen. The detecting device that was used to detect working state of vibrating screen was developed with miniaturization, intelligence and high integrated level. Triaxial acceleration sensor...
This paper focused on experimental data and study for the testing of the material mechanical properties using vibration technique. By applying vibration analysis and testing on the material, we could determine the natural frequencies, the damping ratio and mode shapes of the structure. However, in this study, we only considering the natural frequencies of the material as the input data needed for...
This manuscript describes a methodology to design a controller for an artificial muscles type four fingers dexterous robotics hand. Electro-Active Polymers (EAP)materials have been used to construct the muscles type four fingers hand. The main dilemma in the control of artificial muscles type fingers, is to provide an accurate fingertips tracking within the operational space. Yet, if bending angles...
A numeric virtual platform of semi-automatic hydraulic upender was built in MSC.ADAMS, and discharge port was modeled flexibly. The virtual shock test of the discharge port was conducted on this platform according to the impact force models to obtain the anti-shock performance limits of the upended. This method can simplify designing and researching processes of mechanical product, shorten researching...
Semi-active pulse switching vibration control technique and stability analysis is studied in this paper. Piezoelectric elements are used to vibration control in this technique. These elements are connected to an electrical shunt circuit containing an inductance and an electronic switch. The switch triggers on the extremums of the system displacement or voltage signal of the piezoelectric elements...
Haptic sensations can be induced without requiring haptic devices through pseudo-haptic feedback by the influence of another sensory modality, such as vision. In this paper, we propose two novel approaches that combine pseudo-haptic feedback with visual and tactile vibrations in order to augment the overall haptic sensation. We would like to investigate the integration of pseudo-haptic feedback with...
This study is to develop a system of a non-destructive testing on the material to define the mechanical properties of material. The study focused on experimental and testing of the material mechanical properties using vibration technique. By applying vibration analysis and testing on the material, we could determine the natural frequencies, the damping ratio and mode shapes of the structure. However,...
Based on the reversibility of magnetically controlled shape memory alloy (MSMA), a new actuator is proposed with self-checking and self-control function in this paper. The actuator can suppress the periodic vibration by adjusting the magnitude of excitation voltage. Operation principle, characteristics and the sensing signal processing of the MSMA actuator are analyzed, and experimental studies are...
Phononic crystals exhibit unique dynamic characteristics that make them act as tunable mechanical filters for elastic or acoustic wave propagation. The introducing of the idea of PCs in engineering structures provides a new technique for the control of vibration and noise. In this paper, basing on the Mindlin plate theory, the Timoshenko beam theory and the Bloch theorem, an efficient finite element...
Based on the principle of axial vibration drilling, the condition of achieving separate type vibration drilling is discussed and the mechanism of chip formation is analyzed. Next, the computation equations of chip dimension are built. Finally, the experiment of separate type vibration drilling is conducted on 2A12 duralumin and Q235 steel. This research shows that, the calculation results of chip...
This article analysis the tunnel water leakage characteristics of the Trial operation of Shanghai Metro on the 7th line. Pointed out that the causes of disease, there are four main areas - engineering design, construction, project supervision, operations environment. Depth analysis of the key of the operations of leakage is segment structural cracks, surface subsidence, segment shrink, protected area...
The principle of Ultrasonic vibration assisted electrical discharge machining in gas medium (UEDM in gas) was proposed in this work and experimental equipment was designed. Hard and brittle materials such as cemented carbide and sintered Nd-Fe-B magnetic materials were machined using the experimental equipment of UEDM in gas. The thermal stress removal mechanisms of hard and brittle materials machined...
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