Dynamic Response of Cable-Stayed Bridges under Moving Loads

Yang, Fengli; Fonder, G.

doi:10.1061/(asce)0733-9399(1998)124:7(741)

Cited by 31 publications

(12 citation statements)

References 14 publications

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“…The dispersion curve is constructed and shown in Figure 27, the figure indicates that the expected critical frequency is 114 kHz and the critical velocity is 1045 m/s for the case of plain tube, as obtained by [18][19][20][21]. The critical velocity and critical frequency is increased, in the case of using stiffeners to about 1190 m/s and 200 kHz, respectively.…”

Section: Shell With Added Stiffeners Measurementsmentioning

confidence: 99%

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Dynamic Stability of Cylindrical Shells under Moving Loads by Applying Advanced Controlling Techniques Part I—Using Periodic Stiffeners

Eldalil

Baz

2009

Advances in Acoustics and Vibration

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The load acting on a cylindrical shell, with added periodic stiffeners, under a transient pressure pulse propelling a pullet (gun case) has been experimentally studied. This study is based on two modes of velocities, the first is subcritical mode and the second is supercritical mode. The stiffeners are added to the gun tube of an experimental gun facility, of 14 mm bore diameter. The radial strains are measured by using high-frequency strain gage system in phase with a laser beam detection system. Time-resolved strain measurement of the wall response is obtained and both precursor and transverse hoop strains have been resolved. The time domain analysis has been done using "wavelet transform package" in order to determine the frequency domain modes of vibrations and detect the critical frequency mode. A complete comparison of the dynamic behavior of the shell tube before and after adding periodic stiffeners has been done, which indicated that a significant damping effect reaches values between 61.5 and 38% for subcritical and critical modes. The critical frequency of the stiffened shell is increased, so the supercritical mode is changed to subcritical mode. The amplification and dispersion factors are determined and constructed; there is a reduction in the corresponding speed frequencies by about 10%. Also the radial-bending vibrations and tube muzzle motions are detected at muzzle velocity ratio of 0.99%, the results indicated that there is a significant improvement in increasing the number of rounds per second by about 36% and increasing the pointing precision by about 47%.

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Section: Shell With Added Stiffeners Measurementsmentioning

confidence: 99%

“…The critical radial frequency for infinite length for thin shells of thickness to radius ratio is less than 1/30 may be estimated with reasonable accuracy according to the findings of Baron and Bleich [19,20] and Tang [21]:…”

Section: Critical Parameters Predictionmentioning

confidence: 99%

Dynamic Stability of Cylindrical Shells under Moving Loads by Applying Advanced Controlling Techniques Part I—Using Periodic Stiffeners

Eldalil

Baz

2009

Advances in Acoustics and Vibration

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“…The phenomenon is caused by the resonance of flexural waves when the moving pressure approaches a critical propagation velocity of the flexural waves in the cylinder. The resonance response of a cylinder, subjected to moving pressure loads, has been investigated by Taylor [2], Jones and Bhuta [3], Tang [4], and Reismann [5]. More recently, Simkins [6] investigated the response of flexural waves in constant cross-sectional tubes, and Hopkins [7] used the finite element method to study the dynamic strain response of a tube with various cross sections.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Fracture of Composite Gun Tubes

Tzeng¹

1999

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The fracture behavior of a composite cylinder subjected to a moving pressure has been investigated. The resonance of stress waves can result in very high amplitude of strains in the cylinder at the instant and location of pressure front passage when the velocity of the moving pressure approaches a critical velocity. The stress wave with high magnitude, while short in duration, might not cause structural failure immediately; however, it could accelerate' the propagation in the cylinder with initial imperfection and shorten fatigue life of the cylinders. The fracture mechanism induced by dynamic amplification effects is especially critical for compositeoverwrapped cylinders because of the multimaterial and anisotropic construction, thermal degradation in material properties, and a design goal that is inherent in lightweight gun barrel applications.u

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“…The phenomenon is caused by the resonance of flexural waves when the moving pressure approaches the velocity of wave propagation in the gun tube. The resonance response in an isotropic cylinder attributed to a moving pressure load has been investigated by Taylor [1], Jones and Bhuta [2], Tang [3], and Reismann [4]. Simkins [5] investigated the dynamic response of flexural waves in steel gun tubes, as very large strains have been observed in a 120-mm tank gun barrel.…”

Section: Introductionmentioning

confidence: 99%

Critical Velocity of Electromagnetic Rail Gun in Response to Projectile Movement

Tzeng¹

2002

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A model is developed to investigate the dynamic response of an electromagnetic rail gun induced by a moving magnetic pressure during launch of projectiles. As the projectile velocity approaches a critical value, resonance can occur and cause high-amplitude stress and strain in the rail at the instant and location of the projectile's passage. In this study, governing equations of a railgun under dynamic-loading conditions are derived that illustrate a lower-bound critical velocity in terms of material properties, geometry, and barrel cross section. A study is then performed to show the effect of these parameters on the critical velocity of the barrel. Accordingly, the model that accounts for projectile velocity and gun construction can be used to guide barrel design.ii

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Dynamic Response of Cable-Stayed Bridges under Moving Loads

Cited by 31 publications

References 14 publications

Dynamic Stability of Cylindrical Shells under Moving Loads by Applying Advanced Controlling Techniques Part I—Using Periodic Stiffeners

Dynamic Stability of Cylindrical Shells under Moving Loads by Applying Advanced Controlling Techniques Part I—Using Periodic Stiffeners

Dynamic Fracture of Composite Gun Tubes

Critical Velocity of Electromagnetic Rail Gun in Response to Projectile Movement

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