Papers by Keyword: Transient Response

Abstract: The most popular kind of anti-vibration mounting for compression is a rubber bushing, which has many components bearing the total weight of the movable part between them and the foundation structure. Ethylene Propylene Dine Monomer (EPDM) blending with natural rubber NR (SMR20) with several percentage ratio reinforced by two types of carbon black (CB) to hold flexible recipes for specific applications such as doors seals and roads humps were discussed here. EPDM/SMR20 with blending ratio (70/30) reinforced by CB N375 was the more flexible recipe with results 19 Mpa, 36 IRHD, 600% and 12% for tensile strength, hardness, elongation and compression set respectively. The behavior of EPDM chains that accept the very fine carbon black particles as a filler and reinforcement agent till 80 pphr loading and also that vulcanized by Sulphur played the major effect of this performance. For a numerical dynamic analysis with finite element model, used for forced vibration to evaluate the dynamic response of recipes. Through the results, it was observed that the dynamic response of recipe A is greater than the other recipes. The high value of the response gives the largest area under the curve and thus has the ability to absorb the largest amount of the applied load.

Abstract: This paper presents an analytical model for analyzing two bonded dissimilar piezoelectric materials weakened by multiple embedded cracks. The medium is subjected to anti-plane mechanical and in-plane electrical loading. We consider the interface imperfect to address potential electro-mechanical damage at the interface, with the electro-mechanical imperfection represented by a linear spring model. First, the solution for a dynamic electro-elastic dislocation in the piezoelectric layer is obtained using the integral transforms technique. Subsequently, the dislocation solutions are utilized to transform the problems into a set of singular integral equations featuring Cauchy kernels, which are then solved numerically in the Laplace transform domain. The numerical Laplace inversion technique calculates the dynamic stress intensity factors (DSIFs). Several examples are analyzed to derive DSIFs for varying crack lengths and the spring constants reflecting imperfect electro-mechanical bonding and the material properties of the piezoelectric layers.

Abstract: This paper presented vibration analyses of a tapered composite thin-wall box beam with rectangular section. In the numerical results, the effects of taper angle on natural frequencies and the corresponding mode shapes, transient responses of the beam were considered. The algorithm and Matlab code using nine nodded rectangular isoparametric plate element with five degree of freedom per node developed to solve the problems.

Abstract: In this paper, the direct boundary element method in the Laplace domain is applied for the solution of three-dimensional transient dynamic problems of anisotropic elasticity in multi-connected domains. The formulation is based upon the integral representations of anisotropic dynamic fundamental solutions. As numerical example the problem of an anisotropic elastic prismatic solid with cubic cavity is investigated.

Abstract: This paper investigates the effect of radial run-out on the transient responses of spur gear pairs with backlash. With the selection of contact parameters which are based on existing contact models, an ADAMS model for a set of spur gears is created and the results are compared with the available solutions in the literature. After observing that ADAMS solutions obtained by determined contact parameters are in close agreement with the solutions given in the literature; a gear which has radial run-out is replaced with the ideal gear. The results are shown to demonstrate the effect of radial run-out on the output gear.

Abstract: The ship power system is a complex system with time varying, nonlinear and strong coupling characters. The traditional PID controller is difficult to meet the requirements of the system.In this paper, a multiple models fuzzy PID controller is designed. Considering the different operating conditions of on-land ship power system, two excitation regulation model which respectively corresponds to a fuzzy PID controller are set up. Each time, based on the input operation condition tested, only one fuzzy PID Controller is chosen to improve the control precision. At the end, simulation results show that multiple model fuzzy PID controller is superior to the single fuzzy PID controller, which effectively improves the transient response of the system, the steady state accuracy and robustness, having good prospects for engineering applications.

Abstract: Apply the test loads of similar truck door on the FE door model of developing truck, analyze the open & close strength with direct transient response method. Based on the strength results, perform fatigue analysis to predict the weak position. Conduct the door open & close test, simulation results and test results match well.

Abstract: This study aims to the development of a simple dynamic model for Proton Exchange Membrane Fuel Cell (PEMFC). The equations representing the thermodynamic laws and describing the respective voltage drop are formulated and are integrated into a LarminieDicks topology lumped parameter equivalent circuit, in order to develop the proposed dynamic model. The model has been validated by experimental results on a fuel cell stack of 500W under both steady-state operation and transient behavior.

Abstract: In recent years, the Low speed two stroke diesel engines are widely used as the main power device of big ship for its so many advantages such as the high power, better economical efficiency and good maintenance. However, the problem of diesel strong vibration and noise becomes a more and more serious at the same time. Because of the Construction Features of marine two-stroke low-speed diesel engine, the structure has to be suffered different kind of forces when it runs. In considering the source of vibration, the whole noise can be divided into combustion noise、machinery noise and aerodynamic noise. The combustion noise caused by cylinder pressure is the most important part of diesel noise. In this paper, the cylinder pressure curves are tested. The internal combustion engine dynamics and the equivalent node load are used in the calculation procedure to achieve the real condition simulation. The loading program is made to simulate the change of cylinder pressure and the move of piston. The transient response of the diesel engine is calculated. The characteristics of diesel caused by cylinder pressure are analyzed.The response analysis can be used to the vibration control.

Abstract: Fish sauce is one of the signature condiments in various cuisines in many countries. In this paper, fish sauces are successfully classified into groups depending on their quality indicated by the level of total nitrogen content. We introduce an electronic nose technology together with a neural network algorithm to the classification of fish sauces. The transient responses are used as features for the creation of pattern vectors for odor samples. The result of principal component analysis shows well-separated patterns of fish sauce. Furthermore, we also apply the learning vector quantization method for the classification. As a result, we obtain high accuracy of more than 90% in the classification of fish sauce based on the level of total nitrogen content.