scholarly journals The inertial loads of a telescopic boom of a truck crane

2021 ◽  
pp. 54-62
Author(s):  
Volodymyr Volianiuk ◽  
Ievgenii Gorbatyuk ◽  
Dmitry Mishchuk
Keyword(s):  
Rotation Speed ◽  
Start Time ◽  
Multiple Factors ◽  
Safety Regulations ◽  
Joint Operations ◽  
Selection Of

Problem. The analysis of existing research and publications in which the main problem is highlighted, namely, that many factors are not taken into account when calculating the inertial loads of the car crane arrows. Accounting for these factors will allow you to more accurately determine the inertial loads of the boom of the car crane, to carry out strength-hunches of the elements of the boom and the selection of components of its drive mechanisms. Goal. The purpose of the work is to determine the inertial navan-loads acting on the load and arrow of the automobile-side crane during the unstable movement of its. Methodology. To calculate the inertial loads, the technique of determining the total inertial loads of the car crane boom during joint operations in accordance with the Safety Regulations has been developed. Total inertial loads were determined for the following cases: joint lifting (lowering) of cargo and arrows; lifting the load and turning the boom; lifting and turning the arrow. Results. The resulting dependencies for determining the inertial loads of the rotary boom of the car crane will allow more accurately taking into account multiple factors to calculate the values of these loads in order to conduct strong calculations of the boom, the selection of its components mechanisms. Originality. When calculating inertial loads, the weight and length of the boom are taken into account; weight and height of lifting of cargo; the radius of the arrow crane; rotation speed of the rotary part of the crane; speed of movement of cargo and arrows; start time and braking of cargo lifting mechanisms, change of departure and turn of the boom. The advantage of this technique is its originality. Practical value. The use of this technique allows more accurately taking into account multiple factors to determine the values of the inertial loads of the automobile crane during the unstable movement of the cargo lifting mechanisms, changes in the discharge of the boom and its rotation in order to conduct strong-standing calculations of the boom elements, the selection of its components.

scholarly journals Early-Life Dam-Calf Contact and Grazing Experience Influence Post-Weaning Behavior and Herbage Selection of Dairy Calves in the Short Term

2020 ◽  
Vol 7 ◽  
Author(s):  
Alessandra Nicolao ◽  
Mauro Coppa ◽  
Matthieu Bouchon ◽  
Enrico Sturaro ◽  
Dominique Pomiès ◽  
...  
Keyword(s):  
Early Life ◽  
Daily Activities ◽  
Dairy Calves ◽  
Short Term ◽  
Start Time ◽  
Grazing Behavior ◽  
Reciprocal Interactions ◽  
Before And After ◽  
And Performance ◽  
Selection Of

Rearing dairy calves with their mothers could teach them how to graze, optimizing grass use, and improving their welfare and performance. We tested the short-term effects of dam-calf contact experience on grazing and social behavior of weaned calves, monitored over seven days for their first post-weaning grazing experience. “Dam” (D) calves were reared and grazed with their mothers until weaning. “Mixed” calves (M) were separated from their mothers after 4 ± 0.5 weeks, they experienced dam-calf contact, but not grazing. “Standard” (S) calves had never experienced either dam-calf contact (separated at birth) or grazing. Each group grazed an equivalent pasture plot offering heterogeneous herbage. Scan sampling of calves' activities was performed every 5 min, 6 h per day, on Days 0, 1, 2, 3, and 7. Daily, the time when calves started grazing after introduction to pasture, and the number and duration of their grazing cycles were measured. Daily activities were differentiated into ingestion, rumination, and idling. The proportion of time that calves spent grouped with other individuals or isolated, and standing or lying were recorded. When grazing, their bites were characterized by botanical family group, height of the selected bite and vegetation status. Individual average daily gains from the 2-week periods before and after grazing were calculated, and were equivalent between groups (313 ± 71 g/d). On Day 0, D-calves started grazing immediately (1 ± 4.1 min), unlike M- and S-calves (39 ± 4.1 and 23 ± 4.1 min), and D-calves grazed patches of dry grass 21.7 times less than M-calves and 16.9 times less than S-calves. Dry herbage patch preference and grazing start time differences disappeared on Day 1. Calves spent the same time ingesting and idling, but M-calves spent on average 1.6 times less ruminating than D- or S-calves. The D-calves showed grazing behavior similar to that of adult cows, selecting grasses throughout pasture utilization, although legumes and forbs were present in the grazed layer. On the contrary, M- and S-calves did not express any specific preference. The S-calves spent more time isolated but had more positive reciprocal interactions than the calves in the other groups.

Research of Rolling Bearing Selection Based on Hybrid Algorithm

2013 ◽  
Vol 834-836 ◽  
pp. 1623-1627
Author(s):  
Jian Ping Tian ◽  
Yu Chun Huang ◽  
Hai Li Yang ◽  
Pei Tang ◽  
Gang Chen
Keyword(s):  
Calculation Method ◽  
Hybrid Algorithm ◽  
Three Dimensional ◽  
Rolling Bearing ◽  
Assembly Model ◽  
Multiple Factors ◽  
The Impact ◽  
Selection Of

According to selection of bearings for the impact of multiple factors and ambiguity, a mixed calculation method of variety of algorithms was presented. Problem was better solved to quantitative of the multiple factors. The unique results of the Selection were ensured. Through MFC, Pro/Toolkit of Pro/E interface was called to generate three-dimensional graphics of bearing automatically in VC++ platform. The three-dimensional graphics of bearing could be used directly in the assembly model of product.

scholarly journals ANALISA DAYA DAN KONTROL KECEPATAN MOTOR PADA ALAT BANTU LAS ROTARY POSITIONER TABLE

2018 ◽  
Vol 4 (1) ◽  
pp. 23
Author(s):  
Hery Saptono ◽  
Gatot Eka Pramono ◽  
Hablinur Al Khindi
Keyword(s):  
Rotation Speed ◽  
Speed Control ◽  
Work Load ◽  
Motor Power ◽  
Correct Position ◽  
Rotary Axis ◽  
Maximum Work ◽  
Welding Position ◽  
Proper Analysis ◽  
Selection Of

Rotary Positioner Table is one of the welding aids that are widely used industrial world especially welding with the intention of facilitating welder to work on certain products. As the name implies Positioner which means positioning where the tool in this design can position the welding object freely according to the correct position and comfortable for people who are doing welding. This tool can be applied to drill the hole circle the same distance on the flange, to cut the round pieces , for welding pipes, welding shafts, discs, truck rims, etc.The selection of motor types and speed control becomes very important to support the performance of this tool which is expected to be used for welding with a maximum work load of 100 kg with vertical welding position. For that matter proper analysis is needed to determine the motor power and rotation speed of the turntable in order to get the best welding results. The way this Positioner tool works mechanically by rotating the rotary axis (lever) that has been made, to adjust the angle manually. This positioner can move on the X, Y, and Z axes.

Organization of transport of dangerous goods road transport

2018 ◽  
Vol 120 ◽  
pp. 341-363
Author(s):  
Grzegorz Rogalski ◽  
Dariusz Pyza
Keyword(s):  
Transport Process ◽  
External Environment ◽  
Hazardous Materials ◽  
Road Transport ◽  
Dangerous Goods ◽  
Safety Regulations ◽  
Safe Transport ◽  
Transport Of Dangerous Goods ◽  
Selection Of

The article presents selected problems of organization of dangerous goods transport. The transport of dangerous goods in accordance with safety regulations and standards guarantees not only the minimization of hazards resulting from the transport of hazardous materials, but also its full effectiveness. Selection of the type of packaging and means of transport depending on the threats posed by a specific dangerous product, it affects the safety of transport and the external environment. In this sense, the article presents the characteristics of legal acts related to the transport of hazardous materials, the conditions of safe transport and the obligations of participants in the transport process.

Simulation of Bone Remodelling and Bone Ingrowth within Scaffolds

2008 ◽  
Vol 377 ◽  
pp. 225-273 ◽  
Author(s):  
Jose A. Sanz-Herrera ◽  
J.M. García-Aznar ◽  
Manuel Doblaré
Keyword(s):  
Tissue Engineering ◽  
Computational Modeling ◽  
Bone Remodelling ◽  
Bone Ingrowth ◽  
Correct Selection ◽  
Bone Scaffold ◽  
Multiple Factors ◽  
Current Trends ◽  
Ability To Regenerate ◽  
Selection Of

Bone Tissue Engineering is a fast growing interdisciplinary branch of research that aims to find adequate replacements or scaffolds for bone, in order to improve its ability to regenerate itself. The present work summarizes the most relevant functional properties of bone and its ability of adaptation, remarking the most crucial characteristics that these replacements must fulfill for appropriate bone regeneration, including the correct selection of the material and structure. The second part presents current trends in computational modeling of bone remodeling and bone ingrowth within scaffolds, with special emphasis on the description of two different mathematical approaches to model these biological regenerative events. We demonstrate that computational modeling is a useful tool for bone scaffold design that allows considering multiple factors some of them very difficult to evaluate experimentally.

How missed temporal deadlines influence consumption behavior

2014 ◽  
Vol 31 (5) ◽  
pp. 360-370 ◽  
Author(s):  
Beth Vallen ◽  
Lauren G. Block ◽  
Eric Eisenstein
Keyword(s):  
Affect Regulation ◽  
Consumer Choice ◽  
Behavior Changes ◽  
Start Time ◽  
Content Type ◽  
Consumption Behavior ◽  
Time Usage ◽  
The Individual ◽  
Insight Into ◽  
Selection Of

Purpose – The purpose of this research is to explore how and why consumption behavior changes across time in reference to a temporal deadline, such as a meeting start time or scheduled appointment. Design/methodology/approach – The authors present findings from two experiments that manipulate distance to/from a deadline and assess behavioral intentions and consumer choice, both before a deadline is reached (i.e. the individual is early) and after a deadline has passed (i.e. the individual is late). Findings – Results demonstrate that, while individuals are more likely to refrain from consumption in favor of being on time as a deadline approaches, they are more likely to engage in consumption activities once they have already missed their deadline. Support is shown for an underlying process of affect regulation; when they are late (vs on time), consumers are likely to regulate affect via the selection of more indulgent options. Practical implications – These studies provide insight into the both the beneficial and detrimental nature of deadlines. Further, they provide insight as to how deadlines impact consumer behavior by demonstrating differential patterns of consumption based on whether an individual is early vs late. Originality/value – Documenting the effect of meeting and missing deadlines on consumption contributes to the literature on time usage and offers insights into individuals’ efforts to prioritize multiple activities that conflict due to time constraints.

Comparative Study of Gobi Soil Subgrade Settlement Forecasting Methods for Double Line 2 of Lanzhou-Xinjiang Railway

2012 ◽  
Vol 430-432 ◽  
pp. 1902-1905
Author(s):  
Zhi Hong Nie ◽  
Kun Li
Keyword(s):  
Comparative Study ◽  
Measured Data ◽  
Start Time ◽  
Double Line ◽  
Forecasting Error ◽  
Forecasting Methods ◽  
Hyperbolic Method ◽  
Selection Of

the measured data of subgrade settlement on Double Line 2 of Lanzhou-Xinjiang Railway are used to analyze the suitability of the hyperbolic method, Hushino method and Asaoka method to Gobi soil subgrade settlement forecasting. The sensitivity of the methods to the data fluctuation and the influence of the forecasting error and the selection of forecasting start time on the forecasting effectiveness were studied to determine the appropriate forecasting methods and forecasting time.

scholarly journals Multiple Factors Influence Undergraduates’ Intent to Use Online Library Resources

2015 ◽  
Vol 10 (4) ◽  
pp. 235
Author(s):  
Eamon C Tewell
Keyword(s):  
Undergraduate Students ◽  
Resource Selection ◽  
Ease Of Use ◽  
Equation Modeling ◽  
Multiple Factors ◽  
Library Resource ◽  
Library Resources ◽  
Intent To Use ◽  
Online Library ◽  
Selection Of

A Review of: Joo, S., & Choi, N. (2015). Factors affecting undergraduates’ selection of online library resources in academic tasks. Library Hi Tech, 33(2), 272-291. doi: 10.1108/LHT-01-2015-0008 Objective – To investigate multiple factors that may affect undergraduate students’ selection of online library resources. Usefulness and ease of use, quality, and user differences were each explored as factors influencing undergraduates’ use intention. Design – Survey questionnaire. Setting – A state university located in the United States of America. Subjects – 332 randomly selected undergraduate students. Methods – A survey designed to measure the intent to utilize online library resources was administered to an undergraduate population. The results, including 11 factors of use intention, were analyzed quantitatively using inferential statistics such as structural equation modeling, multiple regression, t-tests, ANOVAs, and linear regression. Main Results – The factors of usefulness and ease of use were reported to have a positive relationship with undergraduates’ intent to use online library resources (regression weights = 0.473 and 0.408, p < 0.01). Respondents who answered that they were “very or extremely familiar” with online library resources had higher use intention of these sources (mean = 6.17) than other groups moderately or not at all familiar (mean = 5.74 and 4.95, respectively). Experience in a library instruction program was not found to influence use intention (t = -0.368, p > 0.05). Conclusions – The authors conclude that multiple factors influence online library resource selection behavior among undergraduates. The results indicate that usefulness and ease of use are important factors in use intention. The effect of “resource quality” factors, indicated by credibility, format, accessibility, currency, and coverage, suggested that all five factors positively impact use intention. Accessibility is most likely to increase the likelihood of online library resource selection while the credibility of a source has the weakest effect on selection. Familiarity with online library resources and self-reported strong search skills also positively influenced use intention.

A Framework to Reduce the Human Factors for Analysis of Constraint Solvers in Project Management

2020 ◽  
pp. 69-84
Author(s):  
Franklin Johnson ◽  
Broderick Crawford ◽  
Ricardo Soto ◽  
Sanjay Misra
Keyword(s):  
Decision Making ◽  
Project Management ◽  
Human Factors ◽  
Programming Language ◽  
Constraint Solver ◽  
Constraint System ◽  
Multiple Factors ◽  
Different Origins ◽  
Constraint Approach ◽  
Selection Of

Currently, there are multiple factors that affect the projects management. These factors may have different origins, but the human factor is still one of the main elements that affect decisions when managing a project. Another important factor is the use of software that supports these decisions and reduce the human factors. Given the complexity of current management problems, powerful software is needed to solve these problems. Constraint solvers are a kind of software that are based on a constraint approach. Currently there are different constraint solvers. Some are intricate software, and others are libraries for a programming language. This chapter presents a framework that allow to compare a constraint system based on the usability attributes of the solvers in order to reduce the human factors for the selection of the constraint solver. The authors show that it is possible to establish a comparison according to usability attributes, allowing to reduce the risks of decision making by the experts when working with a constrain solver in a project.

AUTOMATED SELECTION OF NEW BUSINESS INTERACTIONS

2009 ◽  
Vol 18 (08) ◽  
pp. 1533-1546
Author(s):  
SYLVIA ENCHEVA ◽  
SHARIL TUMIN
Keyword(s):  
Graphical Representation ◽  
Hasse Diagrams ◽  
Joint Operations ◽  
New Business ◽  
Selection Of

This paper focuses on joint operations of enterprises of various size transporting cargo to pre-determined destinations. Hasse diagrams are used for a graphical representation of collaboration alternatives. Effectiveness of various business alliance partnerships is evaluated employing many-valued logic.

Sign in / Sign up

Export Citation Format

Share Document