Femur bone is the longest and largest bone found in human body. It is also one of the most commonly fractured bones of human body, especially for the elderly. In this paper, vibration analysis of femur bone is studied by the help of finite element simulation to provide more insight in designing bio-aided equipments or protective sports equipments for femur. The simulations were performed using ...

A study of the combined helicopter noise and vibration problem was conducted. A refined aerodynamic model capable of calculating the unsteady surface pressure distribution on rotor blade/flap combinations is developed and coupled with an aeroelastic analysis simulation code. An acoustic prediction tool based on WOPWOP is combined with the aeroelastic analysis based on a flexible blade with coup...

Abstract: Wind load is the key and sensitive for tower structure but national standards tend to think that level stiffness change of cup type transmission tower is uniform along the height. The structure stiffness change of cup type transmission tower was simulated innovatively and found its nonuniformity. The result shows that the structural stiffness uniformly changes along the height when th...

This work studies the dynamics of a 3D dimer bouncing upon a horizontal plate undergoing a vertical harmonic vibration. Despite complex interactions within the system due to impacts and friction, numerical simulation shows that, under certain conditions prescribed for the dynamics, the center of mass of the dimer, when projected onto a horizontal plane, will follow a circular orbit. The phenome...

• Laser vibration sensing has traditionally relied on limiters and &equencymodulation (FM) discriminators to process frequency-modulated laser radar returns. The performance of the traditional FM-discriminator approach can be limited by laser signature characteristics; both the temporal coherence of the laser and t~'get speckle can degrade the performance of an FM-discriminatorbased laser vibra...

This paper presents a new H∞ controller design approach of mixed eigenstructure assignment and H∞ filter for flexible structure vibration control problem. The new approach not only realizes the desired system dynamic response in the time domain through the choice of a state feedback gain using eigenstructure assignment, it also guarantees the performance specifications in the frequency domain b...

This article presents a new vibration diagnostic method designed to (PM) machines with permanent magnets. Those devices are commonly used in small wind and water systems or vehicles drives. The author’s method is very innovative and unique. Specific structural properties of PM machines are used in this method electromotive force (EMF) generated due to vibrations. There was analysed number of pu...

Abstract: Microresonators are popular structures used in a variety of applications. They generally operate in the linear region where the vibration amplitude is limited, thereby limiting the signal-to-noise ratio. The nonlinear vibration region, where amplitudes and, consequently, the signal-to-noise ratio are relatively large, is generally avoided owing to instabilities and complexities in ana...

Electro hydraulic drives are often used where the dynamic response requirements of the driven load in terms of speed, cycling, accuracy and stability are particularly severe. One such application is the control and drive system associated with a high frequency hydraulic vibrator. A hydraulic shaker controls a valve which directs high pressure hydraulic fluid to generate controlled vibration. Hy...

Reduction of structural vibrations is of major interest in mechanical engineering for lowering sound emission of vibrating structures, improving accuracy of machines and increasing structure durability. Besides optimization of the mechanical design or various types of passive damping treatments, active structural vibration control concepts are efficient means to reduce unwanted vibrations. In t...