Response to general dynamic loading and transient response

2012 ◽  
pp. 309-350
Keyword(s):  
Dynamic Loading ◽  
Transient Response ◽  
General Dynamic

Response to General Dynamic Loading

2004 ◽  
pp. 101-147
Author(s):  
Mario Paz ◽  
William Leigh
Keyword(s):  
Dynamic Loading ◽  
General Dynamic

Dynamics of Viscoelastic Plate With Curved Boundaries of Arbitrary Shape

1978 ◽  
Vol 45 (3) ◽  
pp. 629-635 ◽  
Author(s):  
K. Nagaya
Keyword(s):  
Free Vibration ◽  
Transient Response ◽  
Forced Vibration ◽  
Arbitrary Shape ◽  
Impact Load ◽  
Viscoelastic Plate ◽  
Dynamic Loads ◽  
Curved Boundaries ◽  
Vibration Problems ◽  
General Dynamic

This paper is concerned with vibration and transient response problems of viscoelastic plates with curved boundaries of arbitrary shape subjected to general dynamic loads. The results for free and forced vibration problems are given in generalized forms for arbitrary-shaped viscoelastic plates. As examples of this problem, the free vibration of a circular clamped viscoelastic plate with an eccentric hole and the dynamic response of a circular solid viscoelastic plate subjected to an eccentric annular impact load are discussed. Numerical calculations are carried out for both the problem, and experimental results are also obtained as an additional check of this study.

scholarly journals Determination of loads on perforated tank partition

2020 ◽  
Vol 19 (4) ◽  
pp. 80-86
Author(s):  
A. G. Filipov ◽  
I. E. Glazkov
Keyword(s):  
Dynamic Loading ◽  
Hydrodynamic Force ◽  
Added Mass ◽  
Equation Of Motion ◽  
Launch Vehicle ◽  
Fuel Tank ◽  
Dynamic Calculation ◽  
Linear Dynamic ◽  
General Dynamic

The article presents a solution to the problem of dynamic loading of a perforated partition located in the fuel tank of a launch vehicle. A technique for calculating the dynamic loading of the partition is described. Its equation of motion was decomposed into components and the loads at harmonic oscillations of the launch vehicle were calculated. The acceleration of the attachment points and the acceleration of the oscillators simulating the oscillations of the fuel tank, obtained from the solution of the general dynamic problem for assessing the hydrodynamic force for the launch vehicle, were given as the initial data for the dynamic calculation of loads. At this stage, the load on the partition was calculated, taking into account the added mass of the liquid in the event of an emergency shutdown of the propulsion system, as one of the most heavily loaded for the system under discussion. Non-linear dynamic analysis was used to calculate the loads on the perforated partition. As a result of the calculation, forces were obtained in the attachment points of the element in question.

THEORETICAL OF DYNAMIC LOADING AGAINST WATER-FILLED SIMPLY SUPPORTED PIPES

2015 ◽  
Vol 75 (11) ◽  
Author(s):  
Roslina Mohammad ◽  
Astuty Amrin ◽  
Sallehuddin Muhamad
Keyword(s):  
Dynamic Behavior ◽  
Dynamic Loading ◽  
Transient Response ◽  
Governing Equation ◽  
Dynamic Models ◽  
Dynamic Responses ◽  
Perturbation Approach ◽  
Flowing Water ◽  
Euler Beam ◽  
Simply Supported

The primary aim of this study had been to investigate the effects of water-filled flow on the transient response of a simply supported pipe subjected to dynamically applied loading. The importance of this study is manifested in numerous applications, such as oil and gas transportations, where dynamic loading can be the result of an accident. The classical Bernoulli-Euler beam theory was adopted to describe the dynamic behavior of an elastic pipe and a new governing equation of a long pipe transporting gas or liquid was derived. This governing equation incorporated the effects of inertia, centrifugal, and Coriolis forces due to the flowing water. This equation can be normalized to demonstrate that only two non-dimensional parameters governed the static and the dynamic responses of the system incorporating a pipe and flowing water. The transient response of this system was investigated based on a standard perturbation approach. Moreover, it had been demonstrated that the previous dynamic models, which largely ignored the internal flow effects and interactions between the flow and the structure, normally produced a large error and are inapplicable to the analysis of many practical situations. One interesting effect identified was that at certain flow ratio, the system became dynamically unstable and any, even very small, external perturbation led to a growing unstable dynamic behavior. Such behavior, which is called pipe whip, is well-known to everyone who waters a garden using a flexible long hose.

Shock and Dynamic Loading in Portable Electronic Assemblies: Experimental Results

2011 ◽  
Vol 133 (4) ◽  
Author(s):  
A. F. Askari Farahani ◽  
M. Al-Bassyiouni ◽  
A. Dasgupta
Keyword(s):  
Dynamic Response ◽  
Dynamic Loading ◽  
Transient Response ◽  
Failure Modes ◽  
Dynamic Contact ◽  
System Level ◽  
Printed Wiring Board ◽  
Electronic Product ◽  
Electronic Assemblies ◽  
Plastic Housing

The development of portable electronics poses design challenges when evolving new designs for high strain-rate life cycle loading, such as in drop events, blast events, vibration, ultrasonic process steps, etc. This paper discusses an experimental investigation of the transient response of a portable electronic product and its subassemblies to dynamic mechanical loading encountered in drop and shock conditions. The portable electronic product tested in this study consists of a circuit card assembly and a battery pack supported in a two-piece plastic housing with a separate battery compartment. Dynamic loading, consisting of various shock profiles, is applied using an electrodynamic shaker. A number of drop tests are also conducted on a drop tower. Fourier transform technique (FFT) is utilized to analyze the dynamic response of the printed wiring board and the plastic housing in the frequency domain. Tests at the subassembly level are used to study the dynamic response of the individual constituents. The nonlinear interactions due to dynamic contact between these subassemblies are then investigated through shock and drop testing at the system level. These results will be used in a subsequent study to investigate the ability of finite element models to accurately capture this transient response of complex portable electronic assemblies under shock and drop loading. The long-term goal of this combined study is to demonstrate a systematic modeling methodology to predict the drop response of future portable electronic products, so that relevant failure modes can be eliminated by design iterations early in the design cycle.

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