Deflection (engineering)

About: Deflection (engineering) is a research topic. Over the lifetime, 30862 publications have been published within this topic receiving 298849 citations.

Deflection of an optical guided wave by a surface acoustic wave

Abstract: The experimental demonstration of deflection of an optical film‐guided wave by a surface acoustic wave is reported. When Bragg conditions are satisfied, 0.18 W acoustic power gives rise to 66% deflection efficiency as measured by the depletion of the incident optical guided wave.

The aerodynamics and sensory physiology of range fractionation in the cereal filiform sensilla of the cricketGryllus bimaculatus

Abstract: 1. The deflection amplitude of cereal filiform hairs of different lengths was determined for various frequencies of air-current (Fig. 4). The angle threshold of the sensory neuron was then determined (Fig. 7). Both the deflection amplitude and angle threshold were length dependent. 2. In order to estimate the hair deflection, the spring stiffness of the hair supporting apparatus was measured. The stiffness varies by 102 depending on the hair length (Fig. 1). 3. Based on the mechanical properties measured, the deflection amplitude of hair in the sinusoidal air-current is estimated by means of a numerical solution of the equation of motion. The effect of the boundary layer due to the viscosity of air was taken into account. Long filiform hairs deflect more sensitively than short ones in the frequency range below 100 Hz (Fig. 4). 4. We compared a theoretical estimation of hair deflection with direct observation under relatively strong stimuli. The estimation and the observation are in good agreement (Fig. 5). 5. By using the estimated value of hair deflection and the sensory threshold (Shimozawa and Kanou 1984), we were able to determine the angle threshold of the sensory neuron. The angle threshold determined is 0.002° in long filiform hairs. In addition to this low angle threshold, sensory neurons with sensitivity only to fast deflection but not to slow deflection were revealed in association with the short filiform hairs (Fig. 7). 6. When oscillating, the filiform hairs show a self-damping property. The spring stiffness seems to be optimized in relation to the length and moment of inertia to give a critical-damping condition (Table 1). 7. The hair length, the spring stiffness, and the rate of relaxation of sensory neuron show a specific combination in a single sensillum. The specific combination underlies the range fractionation of the filiform sensilla.

Is It a Mode Shape, or an Operating Deflection Shape?

Abstract: Mode shapes and operating "deflection" shapes are related to one another. In fact, one is always measured in order to obtain the other. Yet, they are quite different from one another in a number of ways. This article discusses the relationships between modal testing, modal analysis and operating deflection shape measurements.

Dynamic Models for Structural Plasticity

Abstract: 1 Elastoplastic and Viscoplastic Constitutive Relations.- 2 Principles of Mechanics.- 3 Static Deflection.- 4 Dynamic Rigid-Plastic Response.- 5 Second-Order Effects on Dynamic Response.- 6 More Complex Configurations.- 7 Impact Experiments.