The time domain recursive least squares estimation of parameters in the presence of additive output noise of harmonic form leads to biased estimates. However, frequency domain least squares parameter estimation, where the frequency range contaminated by the noise is eliminated, can be used to obtain good parameter estimates. Both the time domain and frequency domain methods are described, and a...

Machined surface quality determines the reliability, wear resistance and service life of carbon fiber reinforced plastic (CFRP) workpieces. In this work, the formation mechanism of the surface topography and the machining defects of CFRPs are proposed, and the influence of milling parameters and fiber cutting angles on the surface quality of CFRPs is obtained, which can provide a reference for ...

The planned material volume to be removed from a blank create the final shape of part is commonly referred as allowance. Determination machining allowance essential and has great impact on productivity. objective present work use case study investigate how prior rough milling operation affects finish machined surface and, after that, this knowledge design methodology for assess subsequent opera...

Electro-optic switching of reflection and refraction is experimentally demonstrated in metasurface liquid crystal cell. Negative metasurface is fabricated by focused-ion-beam milling, and twisted nematic cells are constructed with complementary double-split ring resonator and V-shape slot antenna metasurface. By application of an external voltage, electro-optic switchings are achieved in reflec...

The continuous optimization of processing technology and evaluation methods is an important way to achieve high quality efficiency for difficult-to-process materials. To solve the problem frequent defects in slot, ultrasonic vibration-assisted slot-milling (UVASM) was developed titanium alloy. Simultaneously, comparative experiments were carried out between UVASM conventional slot milling (CSM)...

End cutting edges of tool determine machining quality the bottom surface slot in end-milling CFRP. However, due to anisotropy and heterogeneous CFRP, also semi-closed characteristic blind slots, end are more vulnerable wear than peripheral under strong abrasive fibers, leading poor thereby decreases assembly performance components. This paper aims reveal laws mechanisms edge which serves condit...

SKD 11 tool steel is among the most popular metals in mold industries for making different kinds of cold work molds and dies with high accuracy and long service life. The demand for higher quality, lower manufacturing costs, particularly the environmentally friendly characteristics, have provided the stimuli for manufacturers and researchers to find alternative solutions. An excellent media is ...

Automated recognition of features from CAD models has been attempted for a wide range of application domains. In this paper we address the problem of representing and recognizing a complete class of features in alternative interpretations for a given design. We present a methodology for recognizing a class of machinable features and addressing the computational problems posed by the existence o...

Automated recognition of features from CAD models has been attempted for a wide range of application domains. In this paper we address the problem of representing and recognizing the complete class of features in alternative interpretations for a given design. We present a methodology for recognizing a class of machinable features and addressing the computational problems posed by the existence...

There is a need in manufacturing as machining of being more productive. However, at the same time, workshops are also urged for lesser energy waste cutting operations. Specially, rough milling impellers and bladed integrated disks aircraft engines an efficient use due to long cycle times. Indeed, avoid dramatic tool failures idle times, conditions operations tend be very conservative. This mult...