Abstarct: This study include of two parts that are explained summary. For Oiler-Bernoly girder with siple fulcrum that are effected by allernate point workload (mobile frequency) are used by dynamic absorbent. A) two element dynamic absorbent include of mass, a linear spring and a damper viscosity for passive absorbent. B) two element dynamic absorbent include of mass, a linear spring and a damper and a feedback controller [PD]. Firstly dominate equation in the system exploted and with changing the variable appropratly and using Glokean method in the single –valued matrix equation generally. Finaly program was solved. The main aggravations were studied and the frequency are computed and considered the effect of several parameter on them and for B part, Therewith the above items, using effect of controller force too.