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In order to improve the stiffness and reduce the weight of the main support structure of space camera, some problems in the truss design were taken into account in this paper. A 4-layer multi-truss made of carbon fiber composite was used in the main support structure for designing a kind of space camera with 7m focal length, relative aperture 1:6. The angles between trusses, pole cross section and...
A system was developed for real-time, in vivo investigation of the relationship between local cell-level nano-mechanical perturbation and cell response to chemical-physical biomaterial surface properties. The system consisted of a magnetoelastic (ME) layer that could be remotely set to vibrate, at submicron levels, at a predetermined amplitude and profile. Experiments result indicated that submicron...
The wireless temperature sensor could be widely used in on-line temperature monitoring of electrical equipment. In order to power wireless sensor and be isolated with high voltage, two novel kinds of micro generators excited by stray energy in electrical equipment are proposed. The vibration generator and temperature gradient generator could harvest mechanical vibration energy and heat energy in the...
Because of various errors in the process of special structural designing, manufacturing and assembLing, there are varying degrees of unbalanced residual content in machine spindle-tool system. This research presents some kinds of imbalance source of spindle-tool system, on the basis of classification, and then its component's dynamic balancing quaLity grade influenced on the balanced state of entire...
This paper describes a new concept for locomotion of miniature robots based on periodic electromagnetic actuation of magneto-sensitive elastomer bodies. The morphology of the robots relies on the dynamics of resonance for locomotion. Based on the described principle two prototypes are presented. The first prototype incorporates an inelastic polymeric frame with an integrated micro-coil and an attached...
In order to improve density uniformity of compacted artificial marble slab, the paper analyzes the working process of vibrating compactor, points that the traditional motion mode of vibrator may cause uneven distribution of materials and proposes a new mode of motion. Lastly, using the finite element software ANSYS, we have performed the stress analysis of the whole working process, and obtained the...
Based on experiments and calculations, the characteristics of a typical aviation pipeline were analyzed. Acceleration excitation experiments of the pipeline were carried out by shaking table, and the dynamic response values at a specific spot of the pipeline were gotten. Considering the additional mass caused by acceleration sensor, based on harmonic response calculations between 100Hz and 1000Hz,...
Piezoelectric materials are frequently used as transducers. Piezoelectric bending mode elements can be used to harvest vibration energy because they can convert mechanical energy into electrical energy. In this article, we present the derivation of the equation for electrical admittance of the symmetrical triple-layer flexural piezoelectric vibrator. The triple-layer piezoelectric vibrator is here...
Based on the classification and analysis for different layered structures and layered materials, the characteristics of clipping of them were deep systematically analyzed in theory. The relation between layout and effectivity of them was discussed after being compared, and the laws of relatively effective layout were presented. The conclusion of the study may be helpful for designing the layered structures...
In practical application of electro-mechanical impedance (EMI) technique, the monitored structure is constantly undergoing change due to external boundary conditions and the surrounding ambience. This change, in most cases, is considered to be normal and a part of the everyday use of the structure. The aim of this paper is to examine and obtain a better understanding of practical issues that are a...
Global dynamics of a simply supported functionally graded materials (FGM) rectangular plate are studied using the extended Melnikov method for the first time. The FGM plate is subjected to the transversal and in-plane excitations. Material properties are assumed to be temperature-dependent. A two-degree-of-freedom nonlinear system governing equations of motion for the FGM rectangular plate is derived...
In order to obtain the mechanism of vibration and noise reduction of circular saws and perform further optimization design, based on the characteristic of propagation in the medium interface of blending wave, mechanism of vibration and noise reduction on circular saw blades with slots and filling materials was expounded from the view of transmission interruption and dissipation of elastic wave. The...
The major limitation of soil application of sewage sludge compost is the total heavy metal contents and their bioavailability and mobility. This study was conducted to evaluate the effect of mature compost as a bulking agent on reduction the mobility and bioavailability of Zn, Cu, Pb and Cr during the sewage sludge composting process. The three composting processes: sewage sludge(SS), sewage sludge...
Taking a super high-rise building as the engineering background, a wind resistant design method of high-rise buildings installed with viscoelastic dampers (VED) is presented in this paper. The mechanical model of VED system and the structure is established through the following steps. Firstly, the typical impulsive wind load is obtained by the impulsive wind simulation program developed by the author...
The waterborne polyurethane composite (WPU/SAN) was prepared by seeded emulsion polymerization. The waterborne polyurethane (WPU) was previously synthesized from isophorone diisocyanate (IPDI), polypropylene glycol (PPG), dimethylolpropionic acid (DMPA) and 1,4-butanediol (BDO) by a two-step process. Styrene (S) and acrylonitrile (AN) were subsequently added to the seed emulsion comprising the WPU...
This study aims to reveal the dynamic response of a reinforced concrete rigid frame bridge subjected to non-uniform seismic excitations. Based on the displacement method and improved large mass method, an acquire technique for quasi-static/dynamic components of structural seismic responses has been presented and validated through numerical simulations. The results indicate that the acquire technique...
The circulation environment factors of package and the buffer mechanism of honeycomb were introduced. Honeycomb paperboard cushioning packaging design methods was studied. When applied in an air conditioner design, it obtained a good result. It can provide the basic theoretical basis for reducing cost and saving material.
In this paper, to implement the locomotion of the microrobot in the organ of digestion or small area such as blood vessels, we designed a wireless microrobot with 3DOFs in pipe with characteristics of multi-functions, controllability, and stability. In addition, the microrobot has light weight and simple structure, simple control method, and good dynamic performance in the water. Firstly, we developed...
The synthesis of 8mol%Y2O3-ZrO2 (YSZ) with 6 wt% Al2O3 by roller vibration milling at room temperature and phase stability of the calcined composite were investigated. The alloying process contained plastic deformation, grain size reduction, particle implantation and atomic diffusion. Disappearance of alumina feature in composite after MA for 45h confirmed the dissolution of alumina in YSZ. It was...
The stability of the out-of-plane vibration for axially moving thin plates with two simply supported edges and two built-in edges is investigated. The Galerkin method is employed to discretize the governing partial differential equations into a set of ordinary differential equations. The complex frequencies are computed via Differential Quadrature Method. The result shows that the natural frequencies...
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