The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Cylinder liner-piston ring is one of the most important rubbing pairs in diesel engines. Its normal operation ensures the high performance of the whole engine system. Previous researches have shown that the process of liner has a great impact on the friction characteristics of cylinder liner-piston ring. Large scale pits and slots in dimension at the liner inner surface were processed and the experiments...
In the process of ultrasonic flaw detection to friction welded joints, a number of weak-binding defects are difficult to be correctly detected due to noise pollution. This article studies the semi-soft threshold denoising method of spatial correlation coefficient based on the traditional spatial correlation coefficient de-noising method and threshold de-noising method, and come up with an improved...
The friction welding supersonic C scanned pictures will introduce the noise in process of gatherring and conversion, and the disturbance of the noise to the image effects image's quality, which brought the enormous difficulties for image characteristic information extraction and analysis. Therefore, this article will propose a denoising analysis method, which obtains the scanned picture to the experiment...
Extrusion process of a large diameter thin-walled aluminum profile was simulated by FEM based on Deform-3D software. The results show that the material flow velocity in the bearing exit of the original designed die is non-uniform. Three times modifications were performed and simulated. The optimal design with more uniform flow velocity in the bearing exit was obtained.
Frictional coefficient is an important hydraulic parameter for pipe network design and scheduling calculation. The inverse analysis to frictional coefficient has much meaning to pipe network optimization and reconstruction. Combining the particle swarm optimization with node water head method, a new inverse analysis method to frictional coefficient is put forward. The example analysis result shows...
Parameter identification for mechanical servo systems with nonlinear friction term is very difficult, and linear identification techniques are not adoptable because that the parameters can not be linear parameterized as well as the local minimum problem. Based on genetic algorithms, this paper presented a two-step offline method for the parameter identification of mechanical servo embedded with LuGre...
Based on genetic algorithms, this paper presents a two-step offline method for the parameter identification of LuGre friction model. In the first step, four static parameters are estimated through the Stribeck curve, and in the second step, two dynamic parameters are obtained by the limit cycle output of the system. Genetic algorithms are used in both steps to minimize the identification errors. At...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.