scholarly journals Analysis of a double steering forest trailer for long wood log transportation

2013 ◽  
Vol 44 (2s) ◽  
Author(s):  
Francesco Marinello ◽  
Stefano Grigolato ◽  
Luigi Sartori ◽  
Raffaele Cavalli
Keyword(s):  
Field Test ◽  
Cost Effective ◽  
Steering System ◽  
Radius Of Curvature ◽  
Technical Solution ◽  
Forest Road ◽  
The Alps ◽  
Curve Radius

A cost effective technical solution of a forest double steering trailer was studied and tested, allowing decrease of radius of curvature and increase of the maneuverability, independently from the length of the transported logs. The steering system improves the so called “stingertype truck” configuration using an articulated frame; through a rearward hinge, the front wheels direction mechanically controls and adapts the direction of rear twin wheels. The study was based on CAD simulations considering the dimensions of the trailer transporting logs with a length up to 12 m. For different log lengths the simulation analyzed the total maneuver area, in terms of minimum curve radius and curve widening. A field test on a prototype operated for transport of long logs along a representative forest road in the Alps was carried out. The results confirm the improvements foreseen by CAD simulations, with allowed curve radius down to 6 m, even with 12 m logs.

IDENTIFICATION OF CURVATURE RADIUS FOR CURVED SECTIONS ON FOREST ROADS IN THE PROCESS OF UTILISATION

2021 ◽  
Vol 14(63) (1) ◽  
pp. 47-56
Author(s):  
Ihor RUDKO ◽  
Borys BAKAY ◽  
Abdullah AKAY ◽  
Vasyl BARYLIAK ◽  
Stanislav HORZOV
Keyword(s):  
Technical Information ◽  
Radius Of Curvature ◽  
Curvature Radius ◽  
Forest Roads ◽  
Forest Road ◽  
Advantages And Disadvantages ◽  
Natural Production ◽  
Angle Deviation ◽  
Road Projects ◽  
Selection Of

This article reviews the problem of measuring the actual radius of curvature for curved sections of existing forest roads, as forestry enterprises require reliable technical information about the current conditions of operated transport networks. It was identified that at this moment, a selection of methods are used for measuring the radii of horizontal curved sections of roads, which have certain advantages and disadvantages in specific natural production conditions. For calculating the radius of curvature for auto forest road projects it is recommended to apply the method of measured angles by chord angle deviation, which is sufficiently accurate for engineering purposes and does not require usage of special high-precision equipment and tools.

Cost-effective 4D with Signal-apparition-enabled Sim Source Acquisition - Preliminary Results from an OBS Field Test

2017 ◽  
Author(s):  
K. Eggenberger ◽  
J.O.A. Robertsson ◽  
D.J. van Manen ◽  
F. Andersson ◽  
Å.S. Pedersen ◽  
...  
Keyword(s):  
Field Test ◽  
Cost Effective ◽  
Preliminary Results

Vehicle yaw stability control using active rear steering: Development and experimental validation

2016 ◽  
Vol 231 (2) ◽  
pp. 333-345 ◽  
Author(s):  
Baozhen Zhang ◽  
Amir Khajepour ◽  
Avesta Goodarzi
Keyword(s):  
Cost Effective ◽  
Steering System ◽  
Stability Control ◽  
Vehicle Stability ◽  
Stability Performance ◽  
Active Steering ◽  
Vehicle Stability Control ◽  
Yaw Stability ◽  
Suspension Model ◽  
Vehicle Testing

In this paper, a novel pulse active steering system for improving vehicle yaw stability is developed. In the proposed method, pulses are sent to the steerable rear wheels whenever the error between the expected and actual yaw rate is outside a predetermined range. The proposed method and its performance are verified experimentally by full vehicle testing. For this purpose, a simplified vehicle model and a rear suspension model are developed. Vehicle stability is investigated and the steering pulse parameters on the vehicle’s stability are studied. A control system is designed and numerical simulations are performed. Moreover, the active rear steering system is implemented on a Lexus for performing road experiments. Results from simulations and experiments indicate that considerable improvement in the yaw stability performance can be achieved by the proposed system. The proposed method is more cost effective and simpler for vehicle stability control.

scholarly journals An evaluation of pool-sequencing transcriptome-based exon capture for population genomics in non-model species

2019 ◽  
Author(s):  
Emeline Deleury ◽  
Thomas Guillemaud ◽  
Aurélie Blin ◽  
Eric Lombaert
Keyword(s):  
Evolutionary Biology ◽  
High Throughput Sequencing ◽  
Harmonia Axyridis ◽  
Population Genomics ◽  
De Novo ◽  
Cost Effective ◽  
Allele Frequencies ◽  
Technical Solution ◽  
Model Species ◽  
Exon Capture

AbstractExon capture coupled to high-throughput sequencing constitutes a cost-effective technical solution for addressing specific questions in evolutionary biology by focusing on expressed regions of the genome preferentially targeted by selection. Transcriptome-based capture, a process that can be used to capture the exons of non-model species, is use in phylogenomics. However, its use in population genomics remains rare due to the high costs of sequencing large numbers of indexed individuals across multiple populations. We evaluated the feasibility of combining transcriptome-based capture and the pooling of tissues from numerous individuals for DNA extraction as a cost-effective, generic and robust approach to estimating the variant allele frequencies of any species at the population level. We designed capture probes for ∼5 Mb of chosen de novo transcripts from the Asian ladybird Harmonia axyridis (5,717 transcripts). We called ∼300,000 bi-allelic SNPs for a pool of 36 non-indexed individuals. Capture efficiency was high, and pool-seq was as effective and accurate as individual-seq for detecting variants and estimating allele frequencies. Finally, we also evaluated an approach for simplifying bioinformatic analyses by mapping genomic reads directly to targeted transcript sequences to obtain coding variants. This approach is effective and does not affect the estimation of SNP allele frequencies, except for a small bias close to some exon ends. We demonstrate that this approach can also be used to predict the intron-exon boundaries of targeted de novo transcripts, making it possible to abolish genotyping biases near exon ends.

scholarly journals Maintenance of soil fertility on organic farm by modeling of crop rotation with participation alfalfa

2020 ◽  
pp. 71-82
Author(s):  
Vladan Ugrenovic ◽  
Vladimir Filipovic ◽  
Dusica Delic ◽  
Vera Popovic ◽  
Olivera Stajkovic-Srbinovic ◽  
...  
Keyword(s):  
Soil Fertility ◽  
Crop Rotation ◽  
Crop Residue ◽  
Cost Effective ◽  
Technical Solution ◽  
Organic Farm ◽  
Alfalfa Field ◽  
Alfalfa Seed ◽  
Medicago Sativa L ◽  
Natural Way

The aim of this paper is to maintain soil fertility on an organic farm without livestock production by using alfalfa green biomass. The research was carried out on the farm of Mokrin PP company, by modeling and sizing of crop rotation with alfalfa (Medicago sativa L.) on the non-carbonate humoglay. To ensure a cost-effective technical solution, alfalfa seed production was organized. In the autumn of 2015 alfalfa sowing was carried out in a field of 5 ha. Green biomass of the first and third cuttings, as well as crop residue after harvesting of seeds in the second cutting, were mowed and chopped by harvester for low silage and stored in the silage-pit. After nine months, a mature alfalfa compost was obtained with optimum values of total nitrogen (5.04%), organic matter (42.56%), C/N, pH, humidity, and EC. Two-year alfalfa utilization is the recommended time in this research because to the following benefits: in crop rotation, alfalfa field is provided with nitrogen by symbiotic ni?trogen fixation and the alfalfa is cultivated every five years in the same field, while in the middle of that period the field is fertilized with compost produced on the farm. The amount of compost obtained by crop rotation (2016 - 48.80 t; 2017 - 62.30 t) is enough for about 20% of the arable area per year. Thus, the fields are fertilized every fourth year with 10 t ha-1 of compost. Thanks to alfalfa biomass and seed and also nitrogen fixation, maintaining soil fertility is resolved in a sustainable and natural way.

scholarly journals A BIM-IFC Technical Solution for 3D Crowdsourced Cadastral Surveys Based on LADM

Earth ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 605-621
Author(s):  
Maria Gkeli ◽  
Chryssy Potsiou ◽  
Sofia Soile ◽  
Giorgos Vathiotis ◽  
Maria-Eleni Cravariti
Keyword(s):  
Critical Role ◽  
Three Dimensional ◽  
Cost Effective ◽  
Domain Model ◽  
Technical Solution ◽  
Information Models ◽  
Textual Description ◽  
Building Information ◽  
Cadastral Surveying ◽  
Reliable Solution

In most countries, three-dimensional (3D) property units are registered utilizing two-dimensional (2D) documentation and textual description. This approach has several limitations as it is unable to represent the actual extent of complicated 3D property units in space. As traditional procedures often lead to increased costs and long delays in 2D cadastral surveying, a fast, cost-effective, and reliable solution is needed to cope with the remaining global cadastral surveying needs. Crowdsourcing has claimed a critical role as a reliable methodology with huge potential regarding the realization of 2D and 3D cadastral registration in both an affordable and a timely manner. Many large modern constructions are now planned and constructed based on BIM technology all over the world. The utilization of 3D digital models, such as building information models (BIMs), and the establishment of a connection with the international standard of the Land Administration Domain Model (LADM) could be a solution for the rapid integration of these units into a 3D crowdsourced cadaster with a better representation of the cadastral boundaries of these units, a detailed visualization of complex infrastructures, and an enhancement in the interoperability between different parties and organizations. In this paper, the potential linkage between the BIM, the LADM, and crowdsourcing techniques is investigated in order to provide an effective technical solution for the integration of large new constructions into 3D crowdsourced cadastral surveys. The proposed framework is tested on a building block in Athens, Greece. The potential, perspectives, and reliability of such an implementation are assessed and discussed.

Indicator of bending strength of planetary gear satellite teeth, cut with non-standard tool of various types

2021 ◽  
pp. 3-6
Author(s):  
Keyword(s):  
Bending Strength ◽  
Planetary Gear ◽  
Transition Curve ◽  
Initial Contour ◽  
Radius Of Curvature ◽  
Standard Tool ◽  
Different Types ◽  
Curve Radius ◽  
Transition Curves ◽  
Gear Shaping

A method is presented for determining the radii of curvature of the transition curves of the tooth profiles of satellites of planetary gears with internal gearing of wheels, cut by a tool with a modified initial contour and having increased bending strength. A comparative analysis of the radii of curvature of the profiles of the teeth of the satellites, cut with standard and non-standard tools of different types (gear shaping and rack) is carried out. Keywords: non-standard gear cutting tool, transition curve, radius of curvature. [email protected]

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