Influence Of Installation Research Articles

Shear resistance of an anchoring coupler applied in demountable concrete connection at varying shear positions

Demountable structures are designed to reduce carbon emissions and energy consumption in the construction sector by reusing structural components. This paper focuses on an anchoring coupler with demountable property used in the demountable precast concrete structure. The shear resistance of the anchoring coupler at varying shear positions was investigated, considering the influence of installation and fabrication errors in actual projects. Firstly, several shear tests of the anchoring coupler were conducted. The ultimate capacities and failure modes of anchoring couplers with varying shear positions were obtained. The bearing capacity of the anchoring coupler without the gap between the beam and column is about 1.34 times that with 45 mm gap. The shear model of the anchoring coupler was fitted by the bilinear curves. Secondly, the numerical model of the anchoring coupler was established and verified. And the influence of the shear position on the ultimate strength was further analyzed by parametric analysis. A simplified calculation method of the shear resistance of the anchoring coupler with varying shear positions was proposed. The design equation for predicting the tension-shear interaction was recommended, considering the similarity between the anchoring coupler and conventional bolt. The aim is to provide theoretical guidance for the safety design of the anchoring coupler and optimize the beam-column connection, which is conducive to expanding the application of the demountable precast concrete structure.

Influence of Installation and Adjustment Error of Gravitational Wave Telescope on TTL Noise

Influence of Installation and Adjustment Error of Gravitational Wave Telescope on TTL Noise

A METHOD TO PREDICT FOULING ON MULTI-STOREY BUILDING MOUNTED SOLAR PHOTOVOLTAIC PANELS: A COMPUTATIONAL FLUID DYNAMICS APPROACH

The influence of installation and environmental parameters on dust particle deposition behavior on solar photovoltaic collectors were investigated using Computational Fluid Dynamics (CFD) simulation. Parameters including tilt, height of installation, dust particle size and wind speed were investigated. Modeling of wind flow on the building and the photovoltaic array was achieved using the Shear Stress Transport k-ω turbulence model. The discrete phase model was adopted for dust motion prediction and a model was developed to assess the impact of dust accumulation on the performance of the photovoltaic array. The study revealed that rooftop installations have less dust deposition unlike the ground-mounted installations. The wind flow characteristics on rooftop installations are greatly affected by the building while on ground mounted installations wind flow is only influenced by the tilt of the solar photovoltaic collector. Different tilt angles, wind speeds and particle sizes had different deposition characteristics. The lower impact velocities experienced on ground mounted Photovoltaic (PV) arrays resulted in more deposition for smaller sized (10µm) dust particles compared to the larger sized (50µm and 150µm) particles. On rooftop installations, dust particle size of 150µm had the most deposition at a velocity of 5m/s and hence it resulted in a 22.61% reduction in solar photovoltaic efficiency while the least reduction in efficiency of 1.32% was recorded at 15m/s and 10µm size dust particles. The tilt angles of 0o and 22.5o had large sized turbulent eddies compared to the tilt of 45o. The study revealed that ground mounted photovoltaic arrays had more dust deposition compared to rooftop mounted photovoltaics.

Influence of installation of displacement ventilation diffusers above occupied zone on the vertical temperature gradient in simulated office rooms

Displacement ventilation diffusers are typically installed to the occupied zone, which can limit the utilization of the displacement ventilation. This paper presents the full-scale test results of two simulated office rooms with installation of displacement diffusers near wall, above the occupied zone. Vertical temperature gradients are compared to full-scale tests with installation of displacement diffusers to the occupied zone. The full-scale test setup consisted of two displacement diffusers and ceiling exhaust in wellinsulated room with 20.7 m2 floor area and room heights of 5.1 m and 3.3 m. The internal heat loads simulated situations with 10 occupants (simulated with heated cylinders), fluorescent lighting units, solar load on window surface (heated foils in one wall) without/with direct solar load on floor (heated foil on floor). The installation of displacement ventilation diffusers above occupied zone influenced on the vertical temperature gradient above the occupied zone only slightly. It reduced the vertical temperature gradient in the occupied zone. This confirms the operation of the displacement ventilation with this installation. This can be advantageous due to the smaller temperature stratification in the occupied zone, still the ventilation efficiency can be slightly lower comparing to the typical installation of the displacement diffusers.

Acoustic performance of brick masonry walls: Construction defects and influence of installations

Construction defects, even visually untraceable, can forfeit the acoustic performance of systems. The execution of the systems is a parameter that is hard to control. This article aims to evaluate construction defects. Wall system samples of real proportions were made with induced defects. In comparison with the reference, reductions of 1 dB were found for the samples with defective gaps above the wall and 2 dB for the trials with no vertical filling. Regarding the samples with installations, this reduction reached 1 and 3 dB for samples with installation of electrical junction boxes at the same face and two on each face, respectively.

Influence of Thermal Sensor Installation on Measuring Accuracy at Stagnation Points

The development of suitable heat-resistant material and reasonable thermal structure design for a hypersonic aircraft requires highly precise heat transfer prediction, especially at the wing tips or stagnation points where the thermal environment is particularly rigorous. Unfortunately, existing techniques for measuring heat flux via thermal sensors in hypersonic test facilities are excessively complex; any slight deviation from ideal conditions may lead to inaccuracy. In this study, the influence of installation on the accuracy of heat flux measurement for a sphere model using cylindrical thermal sensors was numerically investigated. The sensors examined were protruding or recessed from the model surface on the order of 0.1–0.5 mm, and the influence of variations in installation was estimated by comparing the results against the smoothly installed sensor. Experiments were also run using different Reynolds numbers and sensor diameters to ensure the rules and mechanisms reported are as comprehensive as possible. Results showed that “unsmooth” (i.e., protruding, recessed) installation creates substantial deviation from the actual heat transfer rate; protruding installation resulted in larger deviation than recessed, and the deviation of either installation configuration grew more severe at larger depths from the model surface.

Multiaxial Fatigue Analysis on Reeled Steel Tube Umbilical

Multiaxial fatigue analysis on reeled steel tube umbilical is proposed based on finite element analysis (FEA) results. Due to the complexity of the umbilical geometry, the stresses and strains field becomes multiaxial, worsening the fatigue resistance. The reel-lay method is one of the most efficient and cost-effective methods of umbilical installation. However, if installed by the reel-lay method, material properties of the umbilical change may have an influence in fatigue performance of the line. Finite element analysis is applied with contact formulation, and the load history through the reel, aligner, and straightener is simulated. The strain history of the whole modeling process in the critical element is given, and the properties' change after the load history is discussed. Then, the principal stress criterion and the Brown–Miller criterion (both combined with the critical plane approach) based on FEA results are used to do fatigue life prediction of reeled and nonreeled models. The results indicated that a reel-lay method has a great influence on the fatigue life of steel tube umbilical, so the influence of installation on the steel tube umbilical fatigue must be considered when the reel-lay method is adopted.

Verification Test of Foreign-Made Solar Heat Panels and Examination of Dissemination Measures including Hybrid System

While global warming has become more deeply concerned, it is vital for Japan, which has world's top energy efficiency, to proactively adopt renewable energy in consumer category to shift from high dependency of fossil fuels. As for such approach, we have made comprehensive analysis and determination for usage of solar thermal energy. Although it is one of the most effective green technology to reduce GHG emission today, number of installation in Japan has been declining as well as its market shrinking causing withdrawal of manufacturer from the division. On the other hand, installation of such equipments in abroad has been growing which tightened competition resulting in improvements of cost performance and technology, and eventually price-reduction. Thus, we have completed verification test of foreign-made solar heat panels on behalf of Ministry of the Environment and examined its usage, economic impact and influence of installation in order to stimulate domestic market of solar heat panel.

413 海外製太陽熱集熱器の実証試験とその評価(新エネルギー(2))

Recently, global warming has become a serious problem. For Japan in the world's highest level is already energy efficient, the shift from fossil fuels account for the majority of energy is required for promoting greater energy non-fossil. Then, this study is intended to examine possible measures to aggressively promote new energy. Although solar thermal energy is one of the most effective green technology to reduce GHG emission today, number of installation in Japan has been declining as well as its market shrinking causing withdrawal of manufacturer from the division. On the other hand, installation of such equipments in abroad has been growing which tightened competition resulting in improvements of cost performance and technology, and eventually price-reduction. Thus, we have completed verification test of foreign-made solar heat panels and examined its usage, economic impact and influence of installation in order to stimulate domestic market of solar heat panel.