Abstract As con-rod is a critical component in an engine, its reliability overwhelmingly directly affects the performance of whole diesel engine. The fretting wear bushing mainly occurs on contact surface with small end and cap. In proposed study, process end, cap under maximum combustion pressure condition was analyzed, distribution friction stress analyzed. Then orthogonal simulation test des...

To overcome the shortcomings of low energy conversion efficiency electromagnetic acoustic transducers (EMATs), point-focusing shear horizontal (PFSH) wave EMAT is used to focus into a specific area. Many factors will affect capability focusing transducer, and in addition considering signal intensity, detection accuracy also required be investigated. Specifically, simplify test process, we use o...

Marine centrifugal pumps are mostly used on board ship, for transferring liquid from one point to another. Based the combination of orthogonal testing and numerical simulation, this paper optimizes structure a drainage trough typical low-specific speed pump, determines priority various geometric factors pump performance, obtains optimal impeller scheme. The influence tank internal flow is also ...

A general method for constructing asymmetric orthogonal arrays of arbitrary strength is proposed. Application of this method is made to obtain several new families of tight asymmetric orthogonal arrays of strength three. A procedure for replacing a column with 2 symbols in an orthogonal array of strength three by several 2-symbol columns, without disturbing the orthogonality of the array, leads...

The main focus of this paper is on efficiency analysis of two kinds of approximating functions (characteristic orthogonal polynomials and characteristic beam functions) that have been applied in the Rayleigh-Ritz method to determine the non-dimensional buckling and frequency parameters of an angle ply symmetric laminated composite plate with fully elastic boundaries. It has been observed that o...

in this study, the problem of determining an optimal trajectory of a nonlinear injection into orbit problem with minimum time was investigated. the method was based on orthogonal polynomial approximation. this method consists of reducing the optimal control problem to a system of algebraic equations by expanding the state and control vector as chebyshev or legendre polynomials with undetermined...

The Katz-Sarnak density conjecture states that the scaling limits of the distributions of zeroes of families of automorphic L-functions agree with the scaling limits of eigenvalue distributions of classical subgroups of the unitary groups U(N). This conjecture is often tested by way of computing particular statistics, such as the one-level density, which evaluates a test function with compactly...

This paper proposes a novel full-reference quality assessment (QA) metric that automatically assesses the quality of an image in the discrete orthogonal moments domain. This metric is constructed by representing the spatial information of an image using low order moments. The computation, up to fourth order moments, is performed on each individual ð8 8Þ non-overlapping block for both the test a...