作者：
Torres-Arredondo, M.A.Fritzen, C.-P.
Institute of Mechanics and Control Engineering-Mechatronics Paul-Bonatz-Strasse 9-11 57076 Siegen Germany
Acoustic Emission (AE) based techniques are used for the non-destructive inspection of mechanical structures in order to detect very early stage damage before a structure completely fails. The detection and accurate l...
详细信息
ISBN:
(纸本)9781605950242
Acoustic Emission (AE) based techniques are used for the non-destructive inspection of mechanical structures in order to detect very early stage damage before a structure completely fails. The detection and accurate localization of these emissions are essential to provide a reliable fault monitoring and become the backbone for the application of trustworthy quantitative methods for source mechanism characterization. Error analysis is then fundamental for the evaluation of the accuracy and reliability of localization results. In this paper a review of the main analysis techniques is presented and several methods including multiresolution analysis, quadratic time-frequency energy analysis, entropy based onset time detectors and artificial neural networks are used and evaluated. Experiments have been performed by means of simulated sources on the surface of an isotropic plate-like structure using a network of broadband acoustic emission sensors and the spatial localization errors were analyzed. In the end, a method joining different techniques is proposed for providing automatic source location with a very high accuracy.
This paper applies an optimal control approach to an hydraulic system. An approach is proposed to use an open-loop control on the model of a real hydraulic system. The approach uses a feedback control, to create a clo...
详细信息
A nonlinear controller structure for an overhead crane is designed and implemented on a crane plant. The energy based stabilizing controller part is derived by the method of controlled Lagrangians. In that framework, ...
详细信息
How to make vision system work robustly under dynamic light conditions is still a challenging research focus in computer/robot vision community. In this paper, a novel camera parameters auto-adjusting technique based ...
详细信息
The objective of this work is to investigate the effect of the (possible) acid adaptation during growth in a glucose rich environment on the heat resistance of Escherichia coli K12 MG1655. E. coli cells were grown in ...
详细信息
The objective of this work is to investigate the effect of the (possible) acid adaptation during growth in a glucose rich environment on the heat resistance of Escherichia coli K12 MG1655. E. coli cells were grown in TSB and/or TSB dextrose free broth until they reached the stationary phase. Afterwards, the stationary phase cells were added in TSB and/or TSB dextrose free broth and inactivation took place at 54 o C and 58 o C. It was observed that growth in a glucose rich environment leads to an increased heat resistance, most likely due to a certain level of acid and further heat adaptation via cross protection.
In this paper a dynamic model of a stepped beam excited by an electrodynamical actuator with non-negligible dynamics at one end is derived. As model ansatz the superposition of rigid-body and modal dynamics is chosen....
详细信息
We establish the sound absorption mode of micro-nano aperture membrane material according to the classic porous media acoustic theory and cylindrical shell model theory and considering the viscous resistance theory an...
详细信息
We establish the sound absorption mode of micro-nano aperture membrane material according to the classic porous media acoustic theory and cylindrical shell model theory and considering the viscous resistance theory and the heat conduction theory as well. Comparing the theoretical result obtained by simulating the sound absorption property through Matlab and the experimental result, we prove the validity of the mode and it conforms to the sound absorption law of the porous material. We predict the Acoustic Propagation roperties of ordered mesoporous thin film using this mode and find the absorption coefficient is very small and the absorption property of the micro-nano aperture membrane is poor.
Based on all-round effect of error factor for PIGA, the paper establishes theoretical error models. Develops the testing of PIGA on the three-axes turntable, the analysis has shown that the input acceleration includes...
详细信息
The turntable exist multi-period disturbance torque be obtained by setting up the dynamic unbalance model of three-axis test turntable. The multi-period disturbance torque relate to three-axis rotate speed of test ***...
详细信息
A new method to measure the speed of rotating machines based on microcomputer and quadrature encoder is presented in this paper. The hardware and software of the measuring speed system are described. This circuit cont...
详细信息
暂无评论