This paper studies the nonlinear vibration analysis of a simply supported Euler-Bernoulli beam resting on a nonlinear elastic foundation under compressive axial load using nonlinear normal modes concept in the case of three-to-one (3:1) internal resonance. The beam’s governing nonlinear PDE of motion and also its boundary conditions are derived and then solved using the method of Multiple Time ...

ABSTRACT In this paper, we apply the PQ theory with shunt active power filter in an unbalanced and distorted power system voltage to compensate the perturbations generated by non linear load. The power factor is also improved in the current source. The PLL system is used to extract the fundamental component of the even sequence under conditions mentioned of the power system voltage.

Chapter 3 gives an account of the performance of adaptive shunt passive filter controlled by the ANN controller. Its performance was tested by simulation and experiments on 3 thyristor converter fed passive load. It was observed that the adaptive shunt passive filter provides the designed amount of reactive power compensation and filters the harmonic components. However, THD in source current ...

This paper discusses a distributed generation system consisting of grid-connected solar PV and battery-integrated Unified Power Quality Conditioner (UPQC). Embedded in the array, UPQC consists series shunt converter connected back through common DC link. In this system, power quality problems clean energy, such as harmonics, voltage drops, ripples, are compensated by injecting active energy int...

Recently wide spread of power electronic equipment has caused an increase of the harmonic disturbances in the power systems. The nonlinear loads draw harmonic and reactive power components of current from ac mains. Current harmonics generated by nonlinear loads such as adjustable speed drives, static power supplies and UPS. Thus a perfect compensator is required to avoid the consequences due to...

Permanent Magnet Synchronous Motors (PMSM) have important features such as high torque, power density, acceleration, small volume, low noise and efficiency. With these features, is widely used in the industry. One of negativities that occur during operation electric motors speed fluctuations vibrations due to unbalanced loads. Unbalanced loading can be caused by character load, well poor mounti...

By minimizing the total potential energy function and deploying the virtual work principle, a higher-order stiffness matrix is achieved. This new tangent stiffness matrix is used to solve the frame with geometric nonlinear behavior. Since authors’ formulation takes into account the higher-order terms of the strain vector, the convergence speed of the solution process will increase. In fac...

in the conditions in which terrorist attacks on facilities and civilian places increase more and more attention to design of structures against impact loads of explosion is more important and needs special considerations. study of nature of blast loads and methods of applying it on the structure is one of the important problems. explosion is a sudden and rapid release of a great amount of energ...

Aims: Rectification of a slanted continuous concrete box-girder bridge is presented in this paper. Background: Several piers due to uneven ground settlement, inducing excessive width some expansion joints and oversize sliding displacement bearings. The settlement occured the unbalanced soil load on ground. Methods: In project, reverse loading was first applied produce opposite-direction deforma...