Due to the single stage head restriction of well submerged pump iscanceled by international standard and according to the characteristics of thispump,the adjusting design of 175QJ25-13 applying the hydraulic design software PCAD2000 is carried out. The methed of designing about impeller and space bowl vancesare introduced.
Under the conditions of meeting reliability restraint and structure geometry restraint,the reliability and optimum design is made with the minimum of the specific conditions of mechanical parts as the target function of optimization,thus obtaining the more reasonable result than the conventional design.
The new optimality condition doesn't use Luderer's regularity assumption and its Lagrangian multipliers don't depend on the particular elements in the superdifferentials of the object function and constraint functions.
Asymptotic surrogate constraint method and its convergence for a class of semi-infinite programming
A class of constrained semi-infinite minimax problem is transformed into a simple constrained problem, by means of discretization decomposition and maximum entropy method, making use of surrogate constraint.
A interior point scaling projected reduced Hessian method with combination of nonmonotonic backtracking technique and trust region strategy for nonlinear equality constrained optimization with nonegative constraint on variables is proposed.
The horizontal trust region subproblem in the algorithm is only a general trust region subproblem while the vertical trust region subproblem is defined by a parameter size of the vertical direction subject only to an ellipsoidal constraint.
We prove an effective commutativity criterion and classify Gelfand pairs under two mild technical constraints.
Orthogonality conditions for ?1, …, ?q naturally impose constraints on the scaling coefficients, which are then called the wavelet matrix.
Sequential quadratic programming methods for optimal control problems with state constraints
A kind of direct methods is presented for the solution of optimal control problems with state constraints.
At every iteration a quadratic programming which is obtained by quadratic approximation to Lagrangian function and linear approximations to constraints is solved to get a search direction for a merit function.
The chebyshev spectral method with a restraint operator for burgers equation
In this paper, a restraint operator is used to improve the stability of the Chebyshev spectral method.
The design method for the shear resistance of aluminum alloy I-section members is presented, taking into consideration of the post-buckling strength of webs and the restraint effect of flanges, and the practical design formulas are proposed.
The increased production of nitric oxide (NO) in the August strain prevents the appearance of ulcerous lesions of gastric mucosa and behavioral changes induced by restraint stress.
Wistar rats feature a lower level of NO production and are more sensitive to restraint stress compared to the August rats according to both the ulcerous gastric lesions and behavioral parameters.