Investigation of vibrations caused by the inaccuracy of transmission of the mechatronic system

The questions connected with dynamics of mechatronic system at certain radial misalignment of shafts are investigated in offered work. As object of research is the system of two shafts connected by elastic centrifugal ring coupling. It is established, that in coupling, connecting radially misaligned shafts, an internal moment of resistance to rotation is arising. Using principle of d’Alamber for rotary movement, and it is worked out the differential equation describing rotation of the second shaft, and received solutions show, that rotational fluctuations arise in rotating misaligned system. The frequency of fluctuations is double rotation frequency. The results of investigation were applied for vibration reducing of mechatronic system

Vibration dampers for transmission of mechatronic systems

The paper reviews original torsional vibration dampers retaining their efficiency in a wide disturbing frequency band. Some potential design alternatives are considered. The basic structural element of the damper is a rotary flexible ring. The mathematical model of the system estimates inertia, flexible and gyroscopic terms. The equations to calculate the system motion are derived and stability conditions for the system dynamic balance are formulated, proper consideration is given to other possible stability loss forms and regions of the flexible ring. The analysis of the system natural frequencies is made. Efficiency estimation of the damper versus various parameters is effected following the expression of the equivalent inertia moment and its limit value

Dynamics of a thermal vibro-transporter

Numerical model for the investigation of dynamics of a thermal vibro-transporter is proposed. The model is based on the one dimensional linear bar finite element and the stopping mechanism is being taken into account by the penalty method. Results of performed calculations of vibro-transportation are presented. From the presented results the effect of thermal vibro-transportation is clearly seen

Measurement of vibrations of a pipe system

The two dimensional system of pipes is investigated. The model of a pipe system consisting from two dimensional beams by taking the inertia of fluid filling the pipes into account is used and the eigenmodes are determined. The places of the pipe with small amplitudes of vibrations and with large amplitudes of vibrations for the eigenmodes are determined. Then the places where the amplitudes for several first eigenmodes are large are determined. In those places it is recommended to perform measurements of vibrations of the pipe system

Investigation of rotary system containing a flexible centrifugal coupling with controlled damping

The possibility of isolation of the driving shaft of the vehicle from vibrations of the engine shaft using a coupling with a controlled damping element based on magnetorheological liquid and a supplemental disc connected to the driving or driven half–coupling is discussed herein. The impact of the parameters of the coupling and the feedback upon the amplitude– frequency response of the system is analyzed. It is demonstrated that effective damping of vibrations in the resonance zone is possibl

Research of dynamics of lifting equipment

In the recent years, girder bridge cranes are replaced by double-beam overhead cranes with beams of rectangular cross-section. In addition, new materials are used for their fabrication, characterized by different values of allowable loads and deformations. In the paper, two overhead cranes from JSC "Vilniaus kranai" are considered. A mathematical model is proposed that enables assessment of the impact of the hydraulic damper built in the cargo suspension system upon the dynamic features of the crane in the beginning of the lifting process. It was determined that in such a way the period of vibration damping is reduced. However, the impact of the damper upon the dynamics of the metal structure of the crane is limited because of high mobility of the rope as compared to the mobility of the total structure

Interaction of vibrating and translational motions

The mathematical model describing the interaction of a vibrating system and a system performing translational motion is proposed. Such motions take place in vibromotors. The main characteristics of the dynamic motion are defined. The model is investigated numerically and a number of graphical relationships are obtained. They are used in the process of design of systems with vibromotors like a walking inpipe robot

Research of Cargo Delivery Errors by Conveyance using Lifting Mechanism

The mechanical properties of the rope - stiffness and internal friction changes during the movement of cargo. For this reason, under the influence of gravity and inertial forces in the rope having varying tension. Thus, the lift mechanism further exposed to dynamic loads. The highest value of this load is obtained at the beginning of lifting and lowering in place. The mathematical model of the lift mechanism was investigated using the original software package and found dynamic load. In modern control system used cranes lifting mechanism, taking into account the deviation from the vertical rope. Dynamic load on the rope can distort the signals. Results are used to improve the control system of the lifting mechanism

Transverse vibrations of a two-dimensional pipe system

Transverse vibrations of the two dimensional system of pipes are investigated. The model of transverse vibrations of a two dimensional pipe system consisting from beams by taking the inertia of fluid filling the pipes into account is used and the eigenmodes are determined. Then the places of the pipes with small amplitudes of vibrations and with large amplitudes of vibrations for the eigenmodes are determined. After this the places where the amplitudes for several first eigenmodes are large are indicated. In those places it is recommended to perform measurements of transverse vibrations of the pipe system