scholarly journals FEA-Analysis of Shaft and Supports Deformations for Huge Precise Lathe. Statics and Resonances

2018 ◽  
Vol 1 (1) ◽  
pp. 341-348
Author(s):  
Stanislau Dounar ◽  
Alexandre Lakimovitch ◽  
Andrei Ausiyevich ◽  
Andrzej Jakubowski
Keyword(s):  
System Simulation ◽  
Static Stiffness ◽  
Load Bearing ◽  
Machining Forces ◽  
Rotor Shaft ◽  
Fea Analysis ◽  
Bearing System

Abstract Load bearing system simulation is provided for a huge lathe to be renovated. Static and modal analyses are done by FEM. Focus was centerline rising, needed for larger rotor shaft machining. Forces between shaft and three supports were applied. Shaft static stiffness is lowered at 1.15 times only for 600 mm centerline rising. Supports have lost its rigidity at 1.42 times. Concrete pouring into bed cavities is recommended for supports flexibility limitation such as tailstock reinforcement. Robustness of bottom resonances is revealed both for rotor shaft (14.5–18.2 Hz) and supports (42.7–55.4 Hz). Centerline rising is allowed on 300 mm at least. It gives possibility to machine extremely large (up to ø2750 mm) shafts.

Influence of the Load-Bearing System of a High-Rise Building on its Stiffness

2015 ◽  
Vol 769 ◽  
pp. 29-35
Author(s):  
Olga Ivankova ◽  
Lenka Konecna
Keyword(s):  
Dynamic Analysis ◽  
Seismic Event ◽  
Short Description ◽  
Load Bearing ◽  
Static And Dynamic Analysis ◽  
High Rise ◽  
Wall System ◽  
Bearing System ◽  
Computing Models ◽  
Storey Building

Static and dynamic analysis of the high-rise (24-storey) building is discussed in this paper. The influence of the change of load-bearing system on its stiffness in the case of seismic event was detected. Two different load-bearing systems were chosen – the wall system (alt.1) and the skeleton system (alt.2). Finite element method was used for the solution of 3D computing models. Short description of the building, used material, applied load, a type of the subsoil and obtained results are mentioned. Dynamic analysis was repeated for four various seismic areas in Slovakia.

scholarly journals BOUT THE PROBLEM OF ANALYSIS RESISTANCE BEARING SYSTEMS IN FAILURE OF A STRUCTURAL ELEMENT

2018 ◽  
Vol 14 (3) ◽  
pp. 103-113 ◽  
Author(s):  
Anatoly V. Perelmuter ◽  
Oleg V. Kabantsev
Keyword(s):  
Progressive Collapse ◽  
Universal Method ◽  
Dynamic Amplification Factor ◽  
Dynamic Calculation ◽  
Structural Element ◽  
Load Bearing ◽  
Static Calculation ◽  
Dynamic Amplification ◽  
Bearing Structure ◽  
Bearing System

This paper focuses on the methods of calculating load-bearing systems in the case of a failure of a structural element. This kind of failure makes it necessary to assess further behavior of the structure with a possibility of the progressive collapse development. The stress-strain state analysis of a load-bearing system in the case of a failure of a structure is carried out by two main methods – static and dynamic calculation. It is shown that the static calculation (quasi-static analysis using the dynamic amplification factor) is not a universal method. This paper justifies the application of the direct dynamic calculation in the mode of direct integration of motion for the design analysis of load-bearing systems with high rigidity stories (protection structures for a load-bearing system). It also gives recommendations for selecting parameters of the direct dynamic calculation in the case of a failure analysis of a bearing structure.

scholarly journals A UNIFIED MACHINE FOR TECHNOLOGICAL ELECTRIC TRANSPORT LADDER-BACKBONE LOAD-BEARING SYSTEM

2017 ◽  
Vol 4 (3) ◽  
pp. 5-8
Author(s):  
Nikolay Filkin ◽  
Sergey Zykov ◽  
Aleksandr Korshunov ◽  
Petr Zavialov ◽  
Pavol Božek
Keyword(s):  
Electric Transport ◽  
Load Bearing ◽  
Bearing System

Study on Precision Machine Table Equipped with Constant-Flow Hydrostatic Water Bearings

2009 ◽  
Vol 76-78 ◽  
pp. 664-669
Author(s):  
Akinori Yui ◽  
Shigeki Okuyama ◽  
Takayuki Kitajima ◽  
Etsuo Fujita ◽  
Alexander Henry Slocum ◽  
...  
Keyword(s):  
Environmental Pollution ◽  
Electric Power ◽  
Flow Rate ◽  
Machine Tools ◽  
Iron Core ◽  
Constant Flow ◽  
Static Stiffness ◽  
Environmental Friendly ◽  
Gear Pumps ◽  
Bearing System

In order to realize environmental-friendly machine tools, a linear-motor-driven table supported by constant-flow hydrostatic water bearings is developed. The table system is free from environmental pollution because the system needs no oil. For simplicity, a single-sided bearing system is chosen for the table-slide. To obtain a high sustaining force, preload is applied to the bearings using the attractive force of an iron core linear-motor’s magnets. The preload is effective in both the vertical and horizontal directions by inclined motor magnets. Miniature gear-pumps supply flow to the bearings without pump pulsation, and the bearings consume very small amounts of water and electric power. The measured table sustaining force was 3.0kN and static stiffness was 0.3kN/m under a flow rate Q=0.92mL/s per bearing and ideal bearing clearance h=16m.

An Evaluation of the Seismic Performance of a Traditional Timber Building in Istanbul, Based on the Material Deterioration, with the Finite Elements Method

2013 ◽  
Vol 778 ◽  
pp. 470-477
Author(s):  
Hülya Dışkaya ◽  
Oğuz Ceylan
Keyword(s):  
Finite Elements ◽  
Seismic Data ◽  
Structural Characteristics ◽  
Cross Sectional ◽  
Load Bearing ◽  
Material Defects ◽  
Strength Capacity ◽  
Earthquake Resistant ◽  
Finite Elements Model ◽  
Bearing System

This paper endeavors to identify the structural characteristics that render traditional timber buildings in Istanbul earthquake-resistant even ifthey are in a deteriorated state. A traditional timber building of approximately 110 years old located in the Historical Peninsula was selected as a subject for the finite elements model. According to the structural material analysis and the condition of the elements of the load-bearing system, three modelling criteria were chosen to classify the strength capacity of the building. These are: an undamaged (new) building, a 110 year-old building with material defects, and a building with structural decay and broken node points. Seismic data from the 1999 Adapazarı and Düzce earthquakes were used for the modelling. The relative floor displacements of the systems were investigated and theresults were evaluated by comparing the cross-sectional load-bearing capacities

scholarly journals Free space-planning solutions in the architecture of multi-storey buildings

2018 ◽  
Vol 33 ◽  
pp. 01035
Author(s):  
Alexander Ibragimov ◽  
Alexander Danilov
Keyword(s):  
Steel Structures ◽  
Bearing Steel ◽  
Structure Design ◽  
Frame Structure ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Space Planning ◽  
Alternative Approach ◽  
Steel Frame Structure ◽  
Bearing System

Here some aspects of the development of steel frame structure design from the standpoint of geometry and morphogenesis of bearing steel structures of civil engineering objects. An alternative approach to forming constructive schemes may be application of curved steel elements in the main load-bearing system. As an example, it may be circular and parabolic arches or segments of varying outline and orientation. The considered approach implies creating large internal volumes without loss in the load-bearing capacity of the frame. The basic concept makes possible a wide variety of layout and design solutions. The presence of free internal spaces of large volume in buildings of a "skyscraper" type contributes to resolving a great number of problems, including those of communicative nature.

scholarly journals Dynamic Behaviour Analysis of Turbocharger Rotor-Shaft System in Thermal Environment Based on Finite Element Method

2020 ◽  
Vol 2020 ◽  
pp. 1-18
Author(s):  
Zhihao Liu ◽  
Renren Wang ◽  
Fang Cao ◽  
Pidong Shi
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Tangential Force ◽  
Accurate Prediction ◽  
Internal Damping ◽  
Rotor Shaft ◽  
Shaft System ◽  
Rotor Bearing ◽  
Rotor Dynamic ◽  
Bearing System

The stable operation of a high-speed rotating rotor-bearing system is dependent on the internal damping of its materials. In this study, the dynamic behaviours of a rotor-shaft system with internal damping composite materials under the action of a temperature field are analysed. The temperature field will increase the tangential force generated by the internal damping of the composite material. The tangential force will also increase with the rotor speed, which can destabilise the rotor-shaft system. To better understand the dynamic behaviours of the system, we introduced a finite element calculation model of a rotor-shaft system based on a 3D high-order element (Solid186) to study the turbocharger rotor-bearing system in a temperature field. The analysis was done according to the modal damping coefficient, stability limit speed, and unbalance response. The results show that accurate prediction of internal damping energy dissipation in a temperature field is crucial for accurate prediction of rotor dynamic performance. This is an important step to understand dynamic rotor stress and rotor dynamic design.

scholarly journals Statical Evaluation Of The Europe Bridge Between Kehl And Strasbourg According To The “Guideline For The Recalculation Of Existing Road Bridges” With Specific Mathematical And Structural Examination Of The Cracks In The Superstructure

2021 ◽  
Author(s):  
Leonhard Oechsle
Keyword(s):  
Crack Formation ◽  
Fatigue Cracks ◽  
Structural Safety ◽  
Fe Model ◽  
Structural Examination ◽  
Load Bearing ◽  
Literature Research ◽  
Fatigue Design ◽  
Static Modelling ◽  
Bearing System

<div>This master´s project re-evaluates the Europe Bridge after 60 years of service. The framework for the calculations is provided by the “Guideline for the Recalculation of Existing Road Bridges”. With the help of a computer model, generated by the program SOFiSTiK, and the prescribed loads of the guideline, the required checks in the ULS were performed at the main load bearing system. As the results indicate a high exceedance of the capacity, different alternatives were evaluated to restore the structural safety.</div><div><br></div><div>A specific focus was laid on the assessment of the cracks in a connection of the lateral load bearing system. Initially, a literature research on the crack formation in the superstructure of steel bridges was conducted. The gathered information points towards category three fatigue cracks that were caused by poor fatigue design and a discrepancy between static modelling and execution on site. These conclusions were confirmed by the fatigue checks of the affected connections. However, an analysis of the crack detail with a FE-model of the lateral system shows that the crack has no significant impact on the load bearing behaviour of other components. </div>

scholarly journals Distribution of Load Forces in Hollow Core Slabs of Precast Solid Floor Supported on Bearing Walls

2019 ◽  
Vol 18 (2) ◽  
pp. 93-103
Author(s):  
S. V. Bosakov ◽  
A. I. Mordich ◽  
A. A. Karyakin ◽  
S. A. Sonin ◽  
I. S. Derbentsev
Keyword(s):  
Hollow Core ◽  
Load Bearing ◽  
Solid Plate ◽  
Hollow Core Slab ◽  
Building Wall ◽  
Labor Inputs ◽  
Full Scale Tests ◽  
Thrust Forces ◽  
Bearing System

The need to cut construction cost of residential and public buildings and provide them with a free and transformable planning structure during their operation cause interest in building wall systems with a large step of bearing walls. In order to reduce labor inputs and increase rate of construction in such building load-bearing system it is also necessary to maximize the use of large-sized prefabricated products and minimize consumption of in-situ concrete. In this case prefabricated products should be substituted according to the conditions of local (regional) construction industry base and volume of in-situ concrete must be sufficient to ensure a complete redistribution of internal forces between elements of the bearing system under load. As for the described bearing wall system of a multi-storey building the paper presents a flat precast solid floor formed by hollow-core slabs and monolithic crossbars supported by load-bearing walls. The hollow-core slabs supported at the ends on cast-in-place crossbars in the planes of bearing walls are arranged in dense groups between cast-in-place braced cross-beams. Dense contacts between overlapping elements are fixed by internal bonds. New data on distribution of forces in floor elements under the action of a vertical load have been obtained on the basis of full-scale tests and existing theoretical assumptions. It has been established that due to this load reactive thrust forces ensuring an operation of every hollow-core slab group in the floor as an effective solid plate supported along the contour have been originated in the floor plane along two main axes. Calculation of the reactive thrust forces makes it possible more accurately to assess a load-bearing capacity and rigidity of the precast solid floor and to increase a step of bearing walls up to 8 m and more while having hollow-core slabs with a thickness of 220 mm.

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