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.
Actual equipment experiments are adopted to measure the load spectrum of torsion shaft. Virtual prototyping supplement the load spectrum that cannot be measured by actual experiments. The comparison and analysis between actual vehicle experiment data and virtual test results of virtual prototype verify their complementarities, which provide full and accurate load spectrums for the key components....
Focused on the CCD composite dielectrics (Si3N4/SiO2), the method of the thermal-mechanical coupling simulation was studied by three different ANSYS models including the whole model, the 1/4 model and the 2-D model in this paper. The thermal stress and deformation were calculated, and the reasonableness of the simulation method was validated, and the differences of these three models simulation results...
The concept that Mission Based Maintenance Decision-making for Materiel is put forward in this paper. Keeping dependability and operational readiness after mission of material is set as goal, which includes dependability centred maintenance decision-making and operational readiness after mission centred maintenance decision-making for material. The process of mission based maintenance decision-making...
Test data generation relies on the profile during the reliability testing. However, software and hardware reliability test profile are considered separately in imbedded system, and it is not a true indication of the usage to the system. In this paper, we shall first contrast of the test profile construction flow of hardware and software, and find out the integrating of them. And then advance the method...
Firstly, the wear between the lock ring and hook of a retractable undercarriagedoor lock machine under the action of the periodic load has been discussed. Secondly, the calculations based on the Acrhard model has been established to confirm the incremental wear gap in a given time. Thirdly, the analysis and calculation model of the wear reliability were given when the size parameters, load, material...
This paper presents a new non-linear fatigue damage accumulation model based on continuum damage mechanics. The proposed model has been formulated to take into account the damage evolution of material under different loading levels and the effects of loading sequence on fatigue life. In additional, the model has also considered the mean stress in its damage evolution with fewer parameters. Experimental...
To reliability prediction of products with high reliability and long life, the Step Stress Accelerated Degradation Test (SSADT) is commonly applied. With the motivation of predicting product reliability most precisely, this paper discusses degradation process of products using Birnbaum-Saunders model, and proposes an optimal design method of SSADT. In order to minimize the mean square error (MSE)...
Thermal stress and deformation depended on CCD Si3N4/SiO2/Si composite dielectrics thickness was simulated by ANSYS. The simulation results were indicated that the thermal stress of each dielectric film was constant and did not depend on the dielectrics thickness, and the deformation distribution was ring from vertical view, and the extremal deformation was located in the structure center whatever...
System's storage life modeling is a highly discussed topic in reliability field. The tradition methods of System's storage life modeling include fault tree analysis, block diagram analysis and so on. In this article, we assume temperature as the main stress that should be considered and the strength of the system is the maximum temperature the system could bear. Under these assumptions, a new storage...
System reliability-based design is attracting more and more attention as an important tool to decrease the probability of failure. So far, reliability-based methods are studied separately from two aspects: system topology design and structural components design. Actually, system topology and structural components should be designed at the same time when facing a system design problem. In this paper,...
Crack of crankshaft and scuff of bearing have been the bottleneck for the development of large-scale reciprocating compressor. To solve such problems, modal and dynamic response analyses are performed for the crankshaft system. Torsional model shapes and stress status are obtained, which shows that the crack of original crankshaft results from fatigue damage and slight torsional vibration, and two...
Reliability design of an aeroengine burner inner-liner is carried out using a bi-variant Lagrange factor polynomial approach. Thermal stress-dependent strength is represented by a discrete random variable that has different conditional probability mean functions under different thermal stress amplitudes. Then the LFP technique is developed to generate the stress-strength interference model with thermal...
In this research, a stress-strength interference model is developed based on bi-variant Lagrange factor polynomial approach. The first discrete random variable is the independent stress. Thermal stress-dependent strength is represented by the second discrete random variable that has different conditional probability mean functions depending on different stress amplitudes. Then the approach is used...
Silicon is one of the most commonly used materials for functional structure of microelectromechanical system. Its application is seriously restricted by reliability problems. To study the mechanical properties of silicon microstructures, an off-chip test device is designed, mainly consisting of piezoelectric drive, force sensor and displacement sensor. Secondly, a microstructure for bending test is...
In today's global environment, accelerated life testing is becoming a competitive advantage when time spent from conceptual stage to the final product development needs to be minimized (project costs and development time) in order to be successful. Using accelerated life testing techniques for mechanical and structural applications have strong challenges when defining the actual operational loading...
Several damage and defacements widely existing in derrick steel structures are divided into local and overall damage and defacements. Local damage and defacements include cross-section corrosion, member bar initial flexure and the nodes stiffness reducing. The overall damage defacements include overall initial flexure, loading eccentricity and support subsidence. The corresponding damage correction...
This paper presents fast sampling inspection method based on the accelerated degradation test of the smart meters. This method uses the pseudo-life data obtained by the accelerated degradation test, then conducts distribution analysis, including distribution fitting and goodness-of-fit test to determine the final distribution of the pseudo-life data, and then choose sampling inspection method of reliability...
Firstly, this paper conducted the failure modes and effects analysis (FMEA) for the certain hydraulic system; secondly, it calculated the impact load of the hydraulic system when it works; and based on above results of FMEA and the calculation of impact load, it has made the finite element analysis to key components in Abaqus which caused most failures. Finally, it optimized the design of the sealing...
System reliability becomes an increasing concern. The separate generation of hardware and software reliability test data cannot satisfy the demands of system reliability study. This paper introduces an approach to develop the system usage profile, which describes the system how to be used from the analysis of both hardware and software. By establishing the different scenarios of hardware and software,...
Based on the wave equation of longitudinal vibration, the simulation model of cyclic stress properties for sucker rod is proposed. The regression model for stress concentration factor of rods with defects is established by the finite element method. According to the influence of transition section on fatigue limit and service life on the degree of damage, combining the randomness of material mechanical...
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.