The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The article discusses current issues related to the development and application of virtual simulation to ensure the reliability of the electronic equipment in the presence of vibrations on the on-board equipment of the object of its installation. The authors constructed an algorithm of the method of ensuring vibration reliability of developed structures of electronic equipment in the process of virtual...
The squat is a type of rolling contact fatigue (RCF) damage, the existence of squats directly impacts the operating condition of urban rail vehicles. The current detection methods of the rail squats damage are mainly based on track inspection car and rail flaw detector. It has some disadvantages, for example, long detection cycle, no real-time detecting and narrow scope, time consuming and etc. In...
In order to study the influence of dynamic load for CNG cylinder frame in a new energy coach, the finite element model of CNG cylinders and frame was developed with 3D reverse engineering and the finite element method. The strength analysis was performed by loading 6.6g acceleration in the forward direction and 5g acceleration in horizontal direction according to ECE R110 regulations requirements...
Biomechanically, one of the important roles of the cerebrospinal fluid playing is to provide effective damping against sudden intracranial brain motion during head impact. Thus, the mesh density of cerebrospinal fluid in finite element model needs to be studied because of its significant impact on the brain's biomechanical responses, such as relative displacement. This study based on a previous finite...
The structure and working principle of quartz flexible accelerometer was analyzed, a stress analysis on the accelerometer beam was made according to the principle of mechanics. A structure design for the pendulum reed of accelerometer was developed in accordance with the small-range and high precision requirements. The basic structure parameters of the accelerometer were determined. ANSYS software...
The ITER electron cyclotron upper launcher (EC UL) is used to direct high power microwave beams generated by the gyrotrons into the plasma for magneto-hydrodynamic (MHD) control and heating and current drive (H&CD) applications. The UL consists of an assembly of ex-vessel waveguides (WGs) and an in-vessel port plug. The diamond window units form vacuum and tritium confinement boundaries between...
In this paper, a numerical model to assess the vibration characteristics of an existing slender composite footbridge induced by human running load is presented. The aim is to evaluate the serviceability requirement of the structure against the current design standards. The footbridge vibration response is investigated using the finite element software SAP2000 through a series of analyses in terms...
This In this paper, the author conducts a three-dimensional nonlinear dynamic analysis to simulate dynamic centrifuge model tests of loose and dense soils using two different soil models that is modified Drager-Prager model and kinematic subloading tij sand model. Modified Drager-Prager model is a simple soil model that requires only 5 parameters, which can be obtained from SPT-N value, and on the...
The dynamic characteristics of the head disk interface of hard disk drives were simulated by using finite element method. The linear and angular displacement response of the suspension slider and disk were obtained and analyzed. The effect of the amplitude and duration of the external shock on the response of the slider and disk were discussed. The results can be used for the further study of operational...
The crack on grader blade was often occurred in the process of impact, in order to avoid this failure, analyzing the shock resistance of blade was extremely essential. Base on this background, a method to analyze and simulate the shock resistance of blade is preliminarily proposed, a characteristic curve on shock resistance of blade is also obtained based on kinds of impact accelerations. Firstly,...
According to the fact that the ballastless track system study results often deviate from the actual value greatly using the method of simplified box girder in the high-speed railway at present. The new overall 3D models with simple box girder and ballastless track slab are built by using ANSYS software, and dynamic response results of ballastless track slab in the overall structure are analyzed at...
This paper presents a dynamic simulation model which fully describes transient and steady-state operation of flux reversal linear synchronous motor. Magnetic field computation by finite element analysis considering inter-phase coupling effect is performed which leads to phase-independent voltage equation in the dynamic simulation. Motor parameters are obtained by magnetic field computation and put...
An internal impact usually happens when there is a small defect in one part of rolling bearings. The Fault signal from this impact is always masked by different noises such as strong vibrations from other parts and the random noise of instrumentation, which makes it difficult to extract an accurate feature signal for early fault diagnosis. In this paper, a simulation study is conducted using the method...
We present a reduced order finite element (FE) algorithm suitable for real-time nonlinear simulation of soft tissues. A dynamic FE formulation with explicit time integration is employed. We demonstrate significant computation acceleration by performing the time integration in a low-dimensional generalised basis, generated from a set of a priori training simulations. The key mechanism for the acceleration...
Based on the test about compression-rebound properties of material bed, there are three zones in roller mill. The movement of material bed between two rollers in roller mill has been analysed. The pressure distribution equations in every zone on the roller's surface have been derived. The stress in roller is important for roller's failure analysis and the life estimation. But it depends on load, structure...
This study calculated the stresses and deformations of the acrylic tanks used in neutrino experiment under dynamic loads and evaluated the safety level of those tanks. The diameters of those large t tanks are ??3m and the thickness of their walls are only 10mm. The measured mechanical properties are: EB=2.95GPa ??8%, SY=77.92 ??7%, SU= 102.13MPa ??12%. The stress distributions of the tanks were simulated...
Since lead was banned from the solder joints, mechanical tests of microelectronic components and modules have gained much importance not just in mobile electronics but quite in general. The standardized JEDEC drop test is commonly used. It delivers repeatable results for a wide range of loads in the components mounted on the well specified test PCB. As yet the JEDEC drop test is time consuming and...
Additional inertial force will cause the deformation of some parts when 3D-coordinate measuring machine (CMM) runs quickly. It will result in the difference between real results and reading of raster sensor, that is, dynamic error will be produced. This paper presents the theoretical model of CMM dynamic error compensation. The Z-direction deformation of crossbeam is analyzed based on Ansys, one kind...
Reliability performance during drop impact is critical for electronic handheld devices. In this paper, a comprehensive study in efficiency and accuracy of multiple finite element modeling approaches and solution techniques for a wafer-level package (WLP) is presented. JEDEC specified test board is used for the model study. A direct acceleration input method is introduced. Two types of global finite...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.