force vibration
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2021 ◽  
Vol 12 (2) ◽  
pp. 93
Author(s):  
Mohammed J. Hamood ◽  
Saba M. Sabih ◽  
Maha Ghalib Ghaddar


2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Jin Li ◽  
Yu Sang

The linear barycentric rational collocation method for beam force vibration equation is considered. The discrete beam force vibration equation is changed into the matrix forms. With the help of convergence rate of barycentric rational interpolation, both the convergence rates of space and time can be obtained at the same time. At last, some numerical examples are given to validate our theorem.



IEEE Access ◽  
2021 ◽  
Vol 9 ◽  
pp. 10988-11001
Author(s):  
Zhenyang Hao ◽  
Tao Wang ◽  
Xin Cao ◽  
Xue Li ◽  
Qiyao Zhang


2020 ◽  
pp. 106-109
Author(s):  
Aleksandr Mikhailovich Vasiliev ◽  
Sergey Alekseevich Bredikhin ◽  
Vladimir Konstantinovich Andreev ◽  
Phelix Yakovlevich Rudik

The article is devoted to the study of the parameters of the law of the force oscillations excited by a centrifugal vibration exciter of vibration machines.



2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Yaochen Shi ◽  
Hongyan Liu ◽  
Xuechen Zhang ◽  
Qinghua Li ◽  
Xiaocheng Guo

In view of the low accuracy of single signal monitoring for the wear state of vibration drilling bit, a multisignal acquisition system for the wear state of ultrasonic axial vibration drilling bit is built to collect the drilling force, vibration, and acoustic emission signals under three different wear states. The drilling force, vibration and acoustic emission signals of the bit in the drilling process are processed by using wavelet decomposition technology, and the signals are extracted from the wear state of the bit, The wavelet energy coefficient with high state correlation is used as the feature parameter to identify the bit wear state. The feature parameter is trained by the combination of noise assisted LMD method and BP neural network. The experiment of single signal and multisignal fusion monitoring bit wear state is carried out, and the neural network structure is optimized according to the error. The results show that the accuracy of monitoring bit wear with a single signal of drilling force is 83.3%, the accuracy of monitoring bit wear with a single signal of vibration is 91.6%, the accuracy of monitoring bit wear with a single signal of acoustic emission is 91.6%, and the accuracy of monitoring bit wear with multisignal fusion is 95.8%; when the number of network layer is 4, the vibration is monitored with the fusion of force signal, acoustic emission signal, and vibration signal The accuracy of the state of drilling tool is up to 100%. The structure model of neural network is optimized reasonably to improve the recognition rate of bit wear in vibration drilling.





2019 ◽  
Vol 6 (8) ◽  
pp. 085335 ◽  
Author(s):  
Uğur Köklü ◽  
Murat Mayda ◽  
Sezer Morkavuk ◽  
Ahmet Avcı ◽  
Okan Demir


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