As a novel robot which mainly engages in the demolition and transformation of various concrete buildings, has developed rapidly recent years. The impact force is produced by breaking hammer installed front end arm. most important part robot, boom arm composed four parts including supporting arm, main fore system. In this article, mechanical model established, finite element analysis obtaining first four-order natural frequencies modes carried out ANSYS Workbench. results reveal that...

As the exploration of ultra-deep layers and development geothermal resources continue, obtaining more accurate downhole parameters becomes increasingly important. Flow measurement, in particular, is a complex parameter that presents significant challenges. In order to enhance accuracy turbine flow logging tool, this research focuses on optimizing metering structure through range methods. A calculation model related measurement process established, field characteristics flowmeter are analyzed...

The machines that utilize the synchronization of vibrators, such as pile sinkers, breaking hammers and sonic drilling rigs, play an important role in municipal construction resource exploration. In this paper, a novel hydraulic coupling system with large specific power, handy control robust stability for vibrator is presented. To investigate feasibility precision vibrators system, mathematical model established. According to model, characteristics two are discussed when errors their masses,...

Due to the complexity of marine geotechnical engineering, harsh operating environments, loose subsea soils, and high water contents, it is extremely difficult obtain soil samples while maintaining in situ conditions offshore areas. The engineering properties submarine layers Bohai Sea, China, were investigated this work. Wison‐APB borehole wireline piezocone penetration test (CPTU) system was used conduct direct measurements cone tip resistance, sleeve friction, pore pressure. classification...

The Tibetan Plateau, called "the third pole" of the Earth by its highest altitude, is a very sensitive area for hydrological cycle and climatic change. To estimate map snow covered areas Plateau important regional change cycle. fractional cover an image pixel estimated with linear mixture approach, where reflectance "mixed" represented as sum each pure land type weighted their respective proportion in Instrument Field View (IFOV). A method based on spectral unmixing using Moderate Resolution...

Based on the experimental study of shear strengthened reinforced concrete rectangular beam by high-strength steel wire mesh and polymer mortar , finite element extended analysis was used. The software showed that with increasing strand dosage reinforcement length,the strength stiffness members improved . However,with span ratio reduced obviously

Vacuum grouting is a new method to control the groundwater in geotechnical engineering, which often used strata where penetration difficult reach an expected slurry diffusion radius, such as sand and silt strata. There are some theoretical studies about influence of vacuum field on law diffusion. However, research soil properties rare. In this paper, through self-designed device, silty after action studied. The test results indicate that with increase degree, capacity has obvious...

The depth profiles of Ni-coated copper substrates polished by different mesh size sandpapers were measured the glow discharge optical emission spectroscopy (GDOES) profiling technique. well fitted MRI-CRAS model developed recently on basis Mixing-Roughness-Information (MRI) and CRAter-Simulation (CRAS) model, taking into account pronounced crater effect upon GDOES profiling. was characterized quantitatively interface roughness values between coated Ni layer Cu determined compared with ones AFM.

A nanoceramic composite is proposed to coat steel rebar used in reinforced concrete with the purpose of protecting it from corroding. This a new material civil engineering field. For this reason several tests have been performed over coated order know its viability and properties. bending test showed that coating stiff, therefore not flexible enough bend as stirrup. if bended were needed, should be bent before it. While pull-out concluded, there no significant loss bond strength due contact...

The offshore drilling is an important means for human beings to explore sea areas and exploit resources. application of sonic rig in shallow will improve the status quo hammer technology with low efficiency sampling depth.This study analyze process formation vibration (SVD) system. By establishing model SVD system water, continuous distribution mass elasticity continuity are considered. On this basis, affected by three main parameters: weight on bit (WOB), amplitude frequency excitation...

Pointing to problem that the comprehensive evaluation score is not ideal for steady state cornering test conditions and fish hook of a passenger vehicle, considering error speed locations center mass, taking H-arm suspension vehicle as an example, robust optimization compliance characteristics based on Isight CarSim method proposed.Using software model whole by handling stability accuracy vehicle.Utilizing analyze degree influence bushing stiffness verify target function.Adopting NSGA-Ⅱ...