Wind turbine is a clean, renewable and sustainable energy technology that makes it extremely important to promote global transformation achieve low-carbon development. Cracks in wind blades reduce their stability lifespan may lead significant safety hazards. Therefore, blade for the 5MW was modeled with method of layering by zones sections, dynamic characteristics cracks at different positions are analyzed. It can be found maximum stress highest when crack located root blade, from will...

Based on the two-dimensional Arnold's cat map, and a generalized chaos synchronization (GCS) theorem, this paper presents new six-dimensional discrete map (6DCM) with GCS property. A chaos-based pseudorandom number generator (CPNG) is designed based 6DCM. We use FIPA-140-2 tests issued by National Institute of Standard Technology to verify random properties binary sequences generated CPNG. The results showed that all passed tests. confidence interval analysis have sound properties....

Abstract The effect of temperature on phase transformation, metallization rate, carbon residue and agglomeration metal Fe after the pre-reduction carbon-containing pellets in high-chromium vanadium–titanium magnetite (HCVTM) was investigated. results indicated that titanomagnetite finally reduced to (Mg, Fe)Ti 2 O 5 without low valence titanium oxide with increasing from 950 1,250℃; Vanadium produces Fe, VO VC 0.88 V, chromite Cr 3 , CrC x a small amount Cr. With an increase temperature,...

In this paper, we propose a novel manipulated rotating polarization switched quadrature phase shift keying (MR-PS-QPSK) technique, and corresponding correlated constant modulus algorithm (CMA) for signal recovery. The latter utilizes the correlation between PS-QPSK symbols in two polarizations to lock of output signals. Then signals are merged according recovered switching bit, which suppresses noise simplifies subsequent process. A field programmable gate array (FPGA) based real-time...

Abstract-based on a constructive theorem of generalized synchronization (GS) for discrete-time chaos system (DTCS), GS DTCS is constructed via Henon-like map. A new DTCS-based pseudorandom number generator (PNG) introduced. The FIPS 140-2 randomness tests show that the PNG has good pseudo-randomness. Combining and PNG, an image encryption scheme with digital signature established. This able successfully to encrypt decrypt original information without any loss. sensitive perturbations...

Abstract Magnet cracking is a common issue in external rotor motors. To investigate the causes of magnet and propose solutions, authors consider effects shape, yoke material fit on motor magnets, perform static analysis rotor. The simulation test results show that stress distribution tile‐shaped magnets better than rectangular magnets. highest safety margin 56.41% achieved for DT4/N35(EH). maximum force permanent (PM) exceeds 22.38% limit when DT4/SmCo28, which can lead to cracks PM. this...

In the process of promoting new industrialization, it is particularly crucial to build a high-level team engineers. Although China has established world's largest engineering education system, still faces talent gap over 20 million, especially scarcity high-quality technical and skilled engineers, which become bottleneck restricting sustainable development China's industry. this context, on-site engineer special training program emerged, with first phase focusing on advanced manufacturing...

Based on a generalized chaos synchronization theorem for discrete-time systems, this paper introduces new 4-dimensional system. A chaos-based pseudorandom number generator (CPNG) is designed based the We use FIPA-140-2 tests issued by National Institute of Standard and Technology to verify random properties binary sequences generated CPNG. The results showed that all passed tests. confidence interval analysis have sound properties. Furthermore, highly sensitivity seeds (initial conditions...

This paper proposes a novel manipulated rotating polarization switched quadrature phase shift keying (MR-PS-QPSK) technique, and correlated constant modulus algorithm (CMA). The latter utilizes the correlation between PS-QPSK symbols in X/Y polarizations to lock of outputted signals. Then signals are merged according recovered switching bit, which suppresses noise simplify subsequent process. A FPGA based platform is built up implement test this scheme.

The effect of dynamic performance shall be considered when calculating the wind speed relative to turbine structure, since it is essential prolong its service life. This article presents a method get responses under different conditions. time-varying load acting on blade calculated by using element momentum theory, and are applying modal superposition with loads as excitations. A platform constructed experimentally test system. response process adopted carry out analysis, theoretical results...

Undercutting method is now adopted in prosperous cities or complex areas with all kinds of surroundings, but this has great risks. includes many ways, it important to choose a rational one certain project. Based on the design and construction, paper analyzes CRD method, PBA Middle Hole Construction Double Side Drift which were widely used China. The takes safety, cost construction time into account, using Comprehensive Evaluation Fuzzy Mathematics make sure that chosen most feasible one....

Hypoeutectic and hypereutectic Al 2 O 3 +ZrO2 multiphase ceramic-lined composite pipes were produced by using the gravitational separation self-propagate high-temperature (SHS) process. The microstructure of ceramics was observed means SEM EPMA. multi-phase base consists lamellar or rod-like eutecticum ZrO with , dendrite is distributed between (Al +ZrO ) on boundary area in appearance band particle alone hypoeutectic ceramics, snowflake-like fishbone-like ceramics. On basis combustion...

This paper establishes three constructive theorems which are to achieve generalized chaos synchronization (GCS) for non-autonomously discrete time chaotic systems. The uncover the general forms of two GCS systems by a prescribed transformation. Numerical simulation examples given illustrate effectiveness proposed theorems.

Breech mechanism serves to close the breech, fire ammunition and extract cartridge case in firing process. In process, breech completes complicated actions, bears tremendous impact forces produces huge percussive between components. Its major fault mode is grain abrasion caused by dry sliding friction. There are no feasible practical technologies simulate predict failure life of key parts for mechanism. A new simulation prediction method firstly put forward this paper. Based on Pro/E ADAMS,...

Aiming at the problem that traditional demodulated resonance technology has deficiency of difficulty to choose parameters band-pass filter, Kalman filter and fast spectral kurtosis were combined for fault feature extraction rolling bearing. AR model was firstly built with gearbox original vibration signals, then order ascertained AIC formula, finally calculated least-squares method. The signals pretreated by filter. Fast (FSK) used best diagnosis achieved energy operator demodulation...

Torsion shaft is the important buffer and damping component of Self-Propelled Gun. Its main failure mode fatigue fracture. In order to forecast life torsion under stochastic loads, virtual prototyping Gun established in Pro/E ADAMS. A new kind measurement method load spectrums combining actual equipment experiment with firstly put forward this paper provides complete accurate shaft. Stress strain can be obtained based on material’s S-N curve. The forecasted, which provide adequate reference...

In this paper, the viscosity of molten Zr 50 Cu alloy was measured by using NaF-CaF 2 covering slag protection combining rotating cylinder method firstly under non-vacuum melting condition. The curve and temperature acquired stably in range from 1370K to liquidus (1208K). According Arrhenius equation form, viscosity-temperature relation can be fit as following equation: （1208K50 calculated above 1370 1208K. values Hirai model are relatively small, so corrected obtained data. viscosities...

The world economy at present has been affected by a world-wide growing price of raw-materials, increasing labor costs and trade barriers which occur frequently. China, Japan South Korea are geographical neighbor that make close economic contacts. three countries reached an agreement to set up FTA further advance their development. textile clothing industry as important sector our caused the concern many who involved in this with issues regarding how it competes cooperates its partners FTA....

As the digital finite impulse response (FIR) filter can be transformed into shift-add form of multiple small-sized firstorder moments, based on existing fast first-order moment algorithm, this paper presents a novel multiplier-less structure to calculate any number sequential filtering results in parallel. The theoretical analysis its hardware and time-complexities reveals that by appropriately setting degree parallelism decomposition factor fixed word width, proposed may achieve better...

The particularity of lightning flashover failure wind farm is analyzed, and it pointed out that the formation mechanism overvoltage in collector system different from power distribution network. On this basis, analyzed. EMTP-RV software used to simulate typical over-voltage propagation process system. Results show fault Finally, design scheme insulation collection should not directly copy network