Submitted on: 17 June 2019.
Revised on: 09 July 2019.
Accepted on: 20 July 2019.
Romanian Journal of Acoustics and Vibration
http://reply.papertrans.cn/3/274/27313/27313-32.png
http://reply.papertrans.cn/3/274/27313/27313-33.png
Submitted on: 14 January 2019.
Revised on: 16 February 2019.
Accepted on: 13 March 2019.
Romanian Journal of Acoustics and Vibration
http://reply.papertrans.cn/3/274/27313/27313-35.png
http://reply.papertrans.cn/3/274/27313/27313-36.png