In order to improve the fatigue test accuracy and efficiency of full-scale structure wind turbine blades, an effective load matching method for blades under biaxial loading is proposed. The blade scheme designed. transfer matrix used calculate bending moment loading. particle swarm optimization algorithm designed optimize position mass excitation device in flap-wise edgewise directions position...

Abstract Predicting how long time a corrugated board box can be stored with constant load stacked on top of it without failing is an everyday challenge for designer. This basic step in material design which usually resolved by utilizing so‐called stacking factors. A factor the ratio between compression strength and load. Higher factors are used to accommodate longer storing times or high relati...

Abstract Three methods for estimating time-varying (Hilbert-Huang transform, continuous wavelet transformation and partial Floquet analysis) one time-invariant (stochastic subspace identification) natural frequencies viscous damping ratios based on free responses are tested compared. The methods’ performance sensitivities to several system characteristics with a series of simulated responses. I...

We introduce toric complexes as polyhedral complexes consisting of rational cones together with a set of integral generators for each cone, and we define their associated face rings. Abstract simplicial complexes and rational fans can be considered as toric complexes, and the face ring for toric complexes extends Stanley and Reisner’s face ring for abstract simplicial complexes [20] and Stanley...

This study investigated the association of appliance type and tooth extraction with the incidence of external apical root resorption (EARR) of posterior teeth following orthodontic treatment. Pre- and posttreatment orthopantomograms were compared for 97 patients and a 4-grade ordinal scale used to measure EARR. The incidence of EARR was positively associated with tooth position (P < .001), appl...