scholarly journals Research of HCR Gearing Properties from Warm Scuffing Damage Point of View

2014 ◽  
Vol 22 (1) ◽  
pp. 57-62 ◽  
Author(s):  
Siniša Kuzmanović ◽  
Milan Rackov ◽  
Miroslav Vereš ◽  
Adam Krajčovič
Keyword(s):  
Load Capacity ◽  
Point Of View ◽  
Integral Temperature ◽  
Temperature Criterion ◽  
Capacity Calculation

AbstractThe issue of design and dimensioning of HCR gearing, particularly of the gearings with an internal engagement, it nowadays, especially in the design of hybrid cars drives, highly topical. This kind of gearing has many advantages in operation, but at the same time it is more complicated in stage of its design and load capacity calculation. Authors in this contribution present some results of temperature scuffing research of internal and external HCR gearing. There are given the equations for calculation of warm scuffing resistance of both external and internal HCR gearing derived according to the integral temperature criterion.

Natural Frequency Analysis of Hydraulic Quadruped Robot and Structural Optimization of the Leg

2019 ◽  
Vol 142 (1) ◽  
Author(s):  
Qingjun Yang ◽  
Rui Zhu ◽  
Zhenguo Niu ◽  
Chen Chen ◽  
Qi Mao ◽  
...  
Keyword(s):  
Natural Frequency ◽  
Load Capacity ◽  
Structural Parameters ◽  
Multiple Input Multiple Output ◽  
State Equation ◽  
Point Of View ◽  
System Response ◽  
Response Characteristics ◽  
Research Fields ◽  
Natural Frequency Analysis

Abstract Hydraulic quadruped robots can adapt to very complex ground conditions, as they have good maneuverability and high load capacity and, therefore, have received great attention in military research fields all over the world. However, there is no mature theory on how to ensure stable, efficient, and fast walking of robots. In this paper, from the point of view of the natural frequency of the hydraulic system, we first calculate the natural frequency of the robot's legs during the whole motion period of the robot and verify the accuracy of calculation through system identification. Then, through the analysis of the state equation and transfer function matrix of the multiple-input multiple-output system, it is found that the zero and pole of the system are very close, this is why the natural frequency is low but the system response is acceptable and then we prove that no parameter for the simultaneous zero-pole cancelation of two hydraulic cylinders exists. With the goal of increasing the natural frequency, we optimized the leg structure of the robot to find the best structural parameters. Finally, a single-leg test bench was built. The experimental results show that the optimization of the structure can actually increase the natural frequency of the system and significantly improve the response characteristics of the robot.

Behavior of Reinforced Concrete Beams by Confined Oblique Rods

2011 ◽  
Vol 146 ◽  
pp. 27-38
Author(s):  
F. Taouche ◽  
Kamal Ait Tahar ◽  
Ne Hannachi
Keyword(s):  
Shear Force ◽  
Load Capacity ◽  
Point Of View ◽  
Reinforced Concrete Beams ◽  
Experimental Investigations ◽  
Empirical Formulas ◽  
Numerical Studies ◽  
Flexural Ductility ◽  
Zone Of Influence ◽  
Theoretical Results

The specific objectives of this study are: verifying the applicability of the proposed method of reinforcement of the beams by oblique connecting rods confined by a metallic embedded grid material to improve the behavior of concrete from the point of view strength to shear force, and confronting the experimental results acquired with empirical formulas developed by other researches. In this study, experimental investigations were performed to evaluate performance characteristics such as flexural ductility, resistance to shear force and load capacity. The experimental and numerical studies in the present work represent a promising revelation regarding the effectiveness of the proposed reinforcement process by an oblique connecting rods confined by a embedded metallic grid material laid out in the zone of influence of the shear force tilted to 45°. The confrontation of the experimental and theoretical results shows a satisfactory agreement.

Pitting Load Capacity of Helical Gears

2007 ◽  
Author(s):  
Bernd-Robert Ho¨hn ◽  
Peter Oster ◽  
Gregor Steinberger
Keyword(s):  
Calculation Method ◽  
Load Distribution ◽  
Load Capacity ◽  
Test Results ◽  
Calculation Methods ◽  
Helical Gears ◽  
Capacity Calculation ◽  
Overlap Ratio ◽  
Tooth Flank

In experimental analyzes the pitting load capacity of case carburized spur and helical gears is determined in back-to-back test rigs. The research program with one type of spur and 8 types of helical gears includes tests for the determination of influences of varying load distribution, overlap ratio and transmission ratio. The test results are presented and evaluated on the basis of the pitting load capacity calculation methods of ISO 6336-2/DIN 3990, part 2. A new DIN/ISO compatible calculation method for pitting load capacity is presented. This new calculation method comprehends helical gears more adequate than ISO 6336-2 / DIN 3990, part 2 and has the possibility to consider tooth flank modifications. The new calculation method is applied on test results and gears of a calculation study. It shows better accordance with the experimental test results than the present ISO 6336-2 / DIN 3990, part 2.

scholarly journals KAJIAN DAYA TAMPUNG BEBAN PENCEMARAN SUNGAI CIBEUREUM DAS CITARUM DI SEKTOR PERTANIAN

2019 ◽  
Vol 7 (2) ◽  
pp. 072
Author(s):  
Ajeng Alya Hidrijanti ◽  
Iwan Juwana ◽  
Yenita Sandra Sari
Keyword(s):  
Spatial Planning ◽  
Agricultural Sector ◽  
Load Capacity ◽  
Pollution Load ◽  
Total N ◽  
Polluted River ◽  
Pollutant Load ◽  
Agriculture Sector ◽  
Capacity Calculation ◽  
Total P

Abstract Cibeureum watershed is a river located on the border of Cimahi City and Bandung City and empties into the Citarum River. One of the Cibeureum watersheds is from the agriculture sector. Rice fields and gardens in South Cimahi are contributors to pollution in the Cibeureum Sub-watershed. Research on the assessment of pollution load capacity in the Cibeureum Sub-watershed to learn to understand and analyze the burden of the agricultural sector. In addition, the study of the capacity of pollution load in the Cibeureum River has never been carried out, so it is necessary to conduct a study of capacity. Calculation of pollutant load requires data on the area of paddy fields and gardens, emission factors and the number of planting days. Cibeureum watershed is a heavily polluted river after being calculated using pollutant methods with 11.09 results. Pollutant load of Cibeureum Sub-watershed agriculture sector in 2018 is 0.01689 kg/day BOD, 0.001501 kg/day Total-N, 0.0008 kg /day Total-P, and 0.000003 kg /day TSS. Pollutant load for Cibeureum Sub-watershed agriculture sector in 2018 is 0.103377 kg/day BOD, 0.009542 kg/day Total-N, 0.0048 kg/day Total-P, and 0.00508kg/day TSS. Pollutant load generated from the agricultural sector in the year of allocation will not be excluded from the budget for the development of Cimahi City Regulation Number 4 of 2013 concerning Spatial Planning and Cimahi City Areas for 2012-2032. Keywords: Pollutant Load, Agriculture Sector, Cibeureum Sub-watershed, Indonesia  AbstrakSub DAS Cibeureum merupakan sungai yang berada di perbatasan Kota Cimahi dan Kota Bandung dan bermuara ke Sungai Citarum. Pencemar yang masuk ke Sub DAS Cibeureum salah satunya berasal dari sektor pertanian. Sawah dan kebun yang berada di Cimahi Selatan merupakan kontributor terhadap pencemaran di Sub DAS Cibeureum. Penelitian kajian daya tampung beban pencemaran di Sub DAS Cibeureum bertujuan untuk mengetahui dan menganalisis beban pencemar dari sektor pertanian. Selain itu, kajian daya tampung beban pencemaran di Sungai Cibeureum belum pernah dilakukan sehingga perlu dilakukan kajian daya tampung. Perhitungan beban pencemar membutuhkan data luas lahan sawah dan kebun, faktor emisi dan jumlah hari tanam. Status mutu Sungai Cibeureum adalah sungai yang tercemar berat setelah dilakukan perhitungan menggunakan metode indeks pencemar dengan hasil 11,09. Beban pencemar sektor pertanian sawah  Sub DAS Cibeureum pada tahun 2018 sebesar 0,01689 kg/hari BOD, 0,001501 kg/hari Total-N, 0,0008 kg/hari Total-P, dan 0,000003 kg/hari TSS. Beban pencemar sektor pertanian kebun Sub DAS Cibeureum pada tahun 2018 sebesar 0,103377 kg/hari BOD, 0,009542 kg/hari Total-N, 0,0048 kg/hari  Total-P, dan 0,00508 kg/hari TSS.  Beban pencemar yang dihasilkan dari sektor pertanian pada tahun proyeksi tidak dijelaskan akan direncanakan mengalami peningkatan luas lahan dalam Peraturan Daerah Kota Cimahi Nomor 4 Tahun 2013 tentang Rencana Tata Ruang dan Wilayah Kota Cimahi Tahun 2012-2032 sehingga beban pencemar di tahun proyeksi tetap sama seperti tahun 2018. Kata Kunci: Beban Pencemar, Sektor Pertanian, Sub DAS Cibeureum, Indonesia

scholarly journals EVALUATION OF LOAD-BEARING CAPACITY OF THE STEEL CONSTRUCTION JOINTS ON THE BASIS OF COMPONENT METHOD

2021 ◽  
Vol 1 (161) ◽  
pp. 19-24
Author(s):  
Y. Solodovnyk ◽  
V. Riumin ◽  
V. Nikichanov
Keyword(s):  
Load Capacity ◽  
Design Procedure ◽  
Design Codes ◽  
Calculation Algorithm ◽  
Yield Line ◽  
Component Method ◽  
Capacity Calculation ◽  
Complex Phenomena ◽  
Steel Joints ◽  
Connection Design

Connections are essential in every kind of steel constructions. Structure is a constructed assembly of joints separated by members which implies the importance of connections. Three basic parameters describe the behavior of connections: strength, stiffness and ductility, and the mechanical behavior of steel joint in those terms are complex phenomena. It must be said that absence in current Ukrainian design codes rules for the load capacity calculation of steel constructions connections led to some difficulties in project decisions. On the basis of component method, which lay in the EC3 design codes load capacity estimation of beam to column connection was made. According to component method beam to column connection divided into basic components. EN 1993 -1-8 provides a good overview of different components. Most important components for bolted steel joints are the plates and bolts which both are considered by the design of a T-stub through the “Equivalent T-stub in tension”. The procedure of load capacity calculation used yield line formulations to determine resistance of the following basic components: column flange in bending, end plate in bending, column flange in bending, column web in tension, column web in compression, beam flange in compression. Failure by this method is described by yield-line models depending on geometry of plates and bolts. Obtained analytical results were compared with the results obtained by means of specialized software and it shown their adequacy. It must be noted that presented in EC3 calculation algorithm of beam to column connection is time consumable for domestic designer also designer must have knowledge about features of connection design in countries of EC. The choice of design procedure depends on the time effort and thereby to the designer preferences.

Thrust Bearings for Power Gas Turbines

1971 ◽  
Author(s):  
A. J. Leopard
Keyword(s):  
Gas Turbines ◽  
Load Capacity ◽  
Point Of View ◽  
Power Losses ◽  
Service Experience ◽  
Thrust Bearings ◽  
Tilting Pad ◽  
Bearing Assembly ◽  
Design Requirements ◽  
New System

The design requirements of thrust bearings for power gas turbines are discussed with reference to designs which have given satisfactory service. The shortcomings of these designs are analyzed both from the point of view of efficiency and that of service experience. The development of a new system of lubrication designed to overcome these shortcomings is outlined. It is shown that this system, when applied to tilting pad thrust bearings in power turbines, can result in a simpler bearing assembly with increased load capacity and substantially ower power losses.

Buckling of Bamboo Masts with Interposed Spacers

2014 ◽  
Vol 634 ◽  
pp. 389-399 ◽  
Author(s):  
Fernando José Silva ◽  
Bernardo Félix Santiago Lana ◽  
Francisco Carlos Rodrigues ◽  
Luís Eustáquio Moreira
Keyword(s):  
Cross Sections ◽  
Materials Science ◽  
Load Capacity ◽  
Point Of View ◽  
Mechanical Resistance ◽  
Phyllostachys Pubescens ◽  
Structural Element ◽  
Language Engineering ◽  
Load Limit ◽  
Compressive Loads

A hollow bamboo in its raw state, from the geometrical point of view and language engineering can be defined as an element of tubular bar, not prismatic, approximately circular cross sections, stiff by intermittent internal disks positioned along the bar. The decrease in the diameter and wall thickness usually happens from the bottom up, the basal part may contain some exceptions, with sections of the base with diameters smaller than the second, then to diminish steadily to the top. This architecture has a genetic component that resulted from constant interactions of bamboo with the actions of wind, which stimulated increased local resistance of the most requested points mechanically, not only by concentrated lignification in cellulosic tissues, such as the geometric localized variations. From the viewpoint of composite materials science, bamboo can be defined as a composition of two different materials, a first fiber and vessels oriented and aligned along the internodal stem sections, which connect to another material with fibers and vessels tangled - anastonose - intermittent stiffeners composing the above cited nodes. In both materials vessels and fibers are surrounded by a parenchymathous matrix of hollow cells that store sugars. The mechanical point of view, bamboo, due to the configuration, the rigidity and strength components and a tubular geometry is a flexible structural element with high mechanical resistance. This flexibility makes the long elements have low load capacity in flexion compression, if the goal is the application of bamboo in construction structures. This issue can be circumvented by systemic compositions, called masts, [1,2] which can be applied in a single long bamboo element resistant to relatively high compressive loads. In the present investigation, four parallel bamboos 5.5 meters long, the speciesPhyllostachys pubescensare discontinuously connected by bamboo segments interposed fixed by steel pins, achieving this composition with a load limit of 48 kN in controlled experiments. These experiments were also used and motivated to find the numerical modeling by the MEF, whose results were widely discussed.

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