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This paper presents a modal analysis method of the base of welding robot by using the finite element analysis software ANSYS release10.0. The base suffers large dynamic stress as shock and vibration while welding robot works, which on the one hand lead to lower precision of welding, on the other hand, may cause the base damaged. Thus dynamic analysis is necessary for design of the base of welding...
Metal Rubber is special materials and used in aerospace, especially under extreme conditions. It has characteristics of strong adaptability, corrosion resistance, radiation resistance and designability. In this paper, we have manufactured Metal Rubber components, and done some research on the influence of previous deformation to Metal Rubber material's structure and performance, its characteristic...
Piezoelectric energy harvesters are being examined thoroughly as a potential source of electrical power when harnessing surrounding mechanical vibrations. In literature, high frequency energy harvesters are discussed in sufficient details. The development of piezoelectric energy harvester becomes extremely challenging when source vibration frequency is very low. This is due to incompatible stiffness...
Miniature cryogenic coolers are widely used to cool down sensitive image sensors in observation and surveillance satellites. The linear actuator in the cooler compressor operates at a relatively constant rate and this is the main source of vibration disturbance transmitted to the imaging sensor. Passive vibration isolation with and without an absorber, and a semi-active tuned vibration absorber are...
Reliable measurement of the mill load is one of key factors to improve mill productivity, production quality and decrease energy consumption for the grinding process. A multi-source data fusion soft-sensor method is proposed to estimate the operating parameters which present the mill load. Fast Fourier transform (FFT) is used to estimate the power spectral density (PSD) of the vibration signals from...
There are many vibration energy in nature, vibration energy harvesting is an attractive technique for low-power devices. In this paper, a new vibration energy harvesting by carbon nanotube network(NTN)/polydimethylsiloxane(PDMS) composite was investigated. The composite of NTN embedded in PDMS matrix has been fabricated by using filtration, standard integrated circuits processes and transfer process...
Using FE method, the typical honeycomb core modulus is studied, the nonlinear stress-strain relationship with a property of “harden spring” under tensile load and “soften spring” under compress load is obtained. The effect of the height of the core on the analysis of the modulus is discussed, the results are compared with these acquired from Gibson formula. The polynomial fitting method is adopted...
Suppose that a pile embedded in rock obeys a constitutive relation of nonlinear elasticity and linear viscoelasticity, and that the soil around the pile is nonlinear elastic and linear viscoelastic constitutive relation, too. The partial differential equation analyzing the nonlinear axial vibration of the pile is first derived. The Galerkin method is used to simplify the equation. The conditions that...
In this paper, a new-style guide plate, which is applied to silent (teething) driving-chain with external meshing mechanism and rocker-pin jointing, was designed structurally by simulating and analyzing its working stress. The materials in some region where the working stress is low are removed. The new guide board has many advantages in comparison with the conventional one, such as lighter weight,...
Super-heavy Vibration screen is used for screening materials in engineering. In this thesis, on the basis of basic demand for vibration screen with high productivity, the mathematical model with maximum efficiency targets is established while premising the screening productivity, and the optimization technique is used to find the optimized solution by means of making MATLAB optimization program. Result...
In this paper, a series resonant converter (SRC) using a piezoelectric transducer for low profile application is proposed. The proposed circuit allows integration of the power circuit by eliminating conventional bulky magnetic components. Effects of the material constants such as electromechanical coupling coefficient and mechanical quality factor on the converter performance are discussed. Design...
Cement-bonded straw fiber board made from straw fiber and cement was prepared by semi-dry processing technology to investigate the effect of alkali treatment on the mechanical properties of the board. Results indicated that, board fabricated with 1% alkali solution treated fiber showed maximum improvement in mechanical properties. After alkali treatment, hemi-celluloses of straw fiber were removed,...
Micro cracks are usually formed in composite components under librating or friction load. New method with technology of self-healing microcapsules is put forward in this paper. In the crack's extending, the stress is concentrated at the crack end, where the microcapsule is designed to be located. When the stress goes through the microcapsules and causes them to break, the self-healing liquid runs...
To accurately measure the magnetic energy difference at different positions, the Joule balance is designed to work under a high stability and sensitivity environment. This paper presents the detailed design of balance system, the vibration characteristics of the balance foundation and the deformation of balance beam. The experimental results show that the maximum displacement of foundation is detected...
In harsh environments, including high shock and vibration, magnetic devices such as transformer coils are potted to enhance thermal performance and provide mechanical protection. One potting compound frequently used is epoxy containing alumina particles. A nominally isotropic and uniform potting compound consisting of about 70 to 80% by volume 14-28 mesh (0.6 to 1.2 mm across) alumina granules in...
Electronic packages subjected to drop and shock have been simulated using alternative theory known as peridynamic theory in the realm of FEM. In peridynamics, problems are formulated in terms of integral equation which is a substitute to conventional solid mechanics theory where problems are formulated in terms of partial differential equations. This alternative approach is more potent than conventional...
Electric discharge machining (EDM) aided tool vibration is an effective method for some certain materials. In the practical machining process, the timely elevation of the tool electrode is needed to eliminate chipping. In this paper, an adaptive fuzzy control system of a servomechanism for EDM combined with ultrasonic vibration is studied. This control system can adjust the discharge pulse parameters...
Optimization of structures with constrained layer damping by bi-directional evolutionary structural optimization???BESO???was studied in this paper. The sensitivity equation of the objective function about deleted and added elements was built for maximization of modal loss factor of constrained layer damping structure. Firstly the FEA model of the metal structure without constrained layer damping...
The combined FEM-BEM method used to get the frequency response of the vibration and the noise radiation was applied on a gear-box which was the main noise source on the ZH1130 single engine diesel. Based on the prototype using the method, various optimization designs on the component were carried out. And the final design was got through the topology optimization method. The final design was manufactured...
Magnetically controlled shape memory alloy (MSMA) changes its shape with the magnetic field, it can also be used in the inverse operation as sensors. Based on inverse characteristics of MSMA material, prototype and experimental system of the vibration sensor is designed and developed. The operation principle of MSMA vibration sensor is analyzed, the variation laws of induced voltage peak-peak are...
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