Coal gangue (CG) represents a huge amount of industrial solid waste in China, and usually is used as coarse aggregate to produce low-strength coal-gangue-based concrete. In this paper, order prove the possibility obtain higher-strength concrete with higher CG utilization rate, reactive powder (RPC) coal sand replacement at different ratios was studied. RPC samples were prepared by replacing natural river (RS) CG/RS weight from 0-100% intervals 25%. Mechanical tests carried out,...

As offshore wind farms move into deeper waters and the capacity of turbines (OWTs) increases, a new type OWT foundation needs to be developed. In this study, five-bucket jacket (FBJF) was proposed based on broad application multi-bucket (MBJF) in farms. The soil around is subject scour due complex marine environment. To investigate effects scouring FBJF, series local-scour simplified finite-element models FBJF were established using ABAQUS, depth extent bearing with monotonic load analyzed....

Abstract CrCoNi Medium Entropy Alloy’s superior tensile strength and ductility make it promising for engineering structures. Yet, its welding research is in infancy, limiting use. This study used Electron Beam Welding to join MEA GH3536 superalloy the first time. Through finite element modeling experimental validation, we predicted temperature profiles, weld morphology, residual stress distributions, which are crucial understanding mechanical behavior of welded joints. The joints showed a...

The structural modal parameter information can be generally obtained from different vibration responses triggered by unknown excitations using the classic identification methods which are based on assumption that input to structure is exactly same or close stationary random white noise. For actual projects such as offshore wind turbine structure, however, imposed loads cannot considered pure noise excitation because harmonic components emerge obviously in due periodic rotation of rotor. When...

With the rapid development of offshore wind energy, seismic stability foundation structures is a concern, especially if soil sandy that susceptible to liquefaction. One commonly used for bucket foundation. A group centrifuge tests were performed study behavior Acceleration, pore water pressure, settlement, and lateral displacement recorded analyze response both upper structure The influences design parameters such as size foundation, depth penetration in ground, compartments within...

Super typhoon activity is likely to make the electric power network fail, or blow wind-measuring device off, which all lead yaw control system of wind turbine being inactive. Under this condition, blades can be blown by violent side from unfavorable directions, and aerodynamic loads on will increased a large amount, low-cycle fatigue damage other catastrophic collapses. So far, not enough consideration has been given above problems in design. Using transient computational fluid dynamics...

Composite bucket foundations have been transported, installed, and operated successfully economically by the one-step overall transportation method at Qidong, Xiangshui, Dafeng offshore wind farms in China recent decades. This study develops a novel analysis of structure mode on towing system to enhance stability efficiency system. The experimental setup some primary results tank tests during operation, focusing system's responses, would be shared. factors influencing responses different...

As a form of clean and low-carbon green energy, offshore wind power occupies an important position in the global energy structure. With rapid development industry, projects gradually develop from to far-offshore sea areas. The multi-bucket jacket foundation is considerable type for far off-shore projects, but high installation costs involving ship transportation with parted components field has significantly hindered its wide application. In this study, based on 6.7-MW triple-bucket (TBJF)...

Research on the safety of powerhouse in a hydropower station is mostly concentrated vibration machinery structure and concrete within single unit. However, few studies have been focused transmission among units. Due to integrity interaction, it necessary study mechanism In this paper, field structural tests are conducted an underground Yalong River. Additionally, simplified mechanical models established explain theoretically. Moreover, complementary finite element (FE) model built replicate...

Stochastic dynamic analysis of an offshore wind turbine (OWT) structure plays important role in the structural safety evaluation and reliability assessment structure. In this paper, OWT is simplified as a linear single-degree-of-freedom (SDOF) system corresponding joint probability density function (PDF) response calculated by implementation path integration (PI) method. Filtered Gaussian white noise, which obtained from utilization second-order filter, considered horizontal excitation used...

The capacity and size of hydro-generator units are increasing with the rapid development hydroelectric enterprises, vibration powerhouse structure has increasingly become a major problem. Field testing is an important method for research on dynamic identification mechanisms. Research optimal sensor placement very topic due to need obtain effective information from limited test resources. To overcome inadequacies present methods, this paper puts forward triaxial independence driving-point...

The construction of deep-sea and offshore wind farms is key to the development power. Since forms bottom supporting structures their installation methods greatly affect overall cost electrical platform, latest developments in this filed were reviewed, based on which a novel integrated floating method was introduced. First, by incorporating advantages turbine for suction bucket foundation, idea quick four-bucket jacket foundation proposed. Second, process wet towing described, further...