23rd Annual Southern African Transport Conference 2004
http://hdl.handle.net/2263/5202
2024-03-17T11:24:53ZKinematic Analysis of Lifting Booms System for Aerial Work Platform Based on Differential Forward Incremental PID controller
http://hdl.handle.net/2263/42143
Kinematic Analysis of Lifting Booms System for Aerial Work Platform Based on Differential Forward Incremental PID controller
Luo, Tianhong; He, Haiyan; Yin, Xinxian; Zhu, Sunke; Luo, Jiayuan
Paper presented at the 23rd Annual Southern African Transport Conference 12 - 15 July 2004 "Getting recognition for the importance of transport", CSIR International Convention Centre, Pretoria, South Africa.; Abstract: By analyzing the kinematic characteristics of lifting booms system (LBS) of aerial work platform (AWP) about its working process, this paper provided a differential forward incremental PID (DFI-PID) controller to improve its control accuracy. Based on operating principles and structural parameters of LBS, three mathematical models were established: the mechanical motion system of each lifting booms, the mechanical-hydraulic coupling system and the electro-hydraulic proportional system. Meanwhile, a model of LBS was built up based on the electro-hydraulic proportion of AMES. A joint simulation was conducted by integrating the differential forward incremental PID (DFI-PID) controller into AMES (working as a major simulation environment) through certain software interface. Then, a DFI-PID closed-loop controller was designed to analyze the effect of the PID controller on LBS. The result showed that compared with the conventional PID controller, the DFI-PID closed-loop controller had better steady and higher robustness towards command changes and load disturbance. Besides, the validity of joint simulations was also proved.
This paper was transferred from the original CD ROM created for this conference. The material on the CD ROM was published using Adobe Acrobat technology. The original CD ROM was produced by Document Transformation Technologies Postal Address: PO Box 560 Irene 0062 South Africa. Tel.: +27 12 667 2074 Fax: +27 12 667 2766 E-mail: doctech@doctech.co.za URL: http://www.doctech.co.za; Dear Editors:
We would like to submit the enclosed manuscript entitled “Kinematic Analysis of Lifting Booms System for Aerial Work Platform Based on Differential Forward Incremental PID controller”, which we wish to be considered for publication in your journal. No conflict of interest exits in the submission of this manuscript, and manuscript is approved by all authors for publication. I would like to declare on behalf of my co-authors that the work described was original research that has not been published previously, and not under consideration for publication elsewhere, in whole or in part. All the authors listed have approved the manuscript that is enclosed.
In this work, an algorithm of the DFI-PID controller was established, in which two advantages of incremental PID and differential forward PID was highlighted, respectively. Including modeling and dynamic simulation to analyze the effect of the DFI-PID. I hope this paper is suitable for the journal.
We deeply appreciate your consideration of our manuscript, and we look forward to receiving comments from the reviewers. If you have any queries, please don’t hesitate to contact me at the address below.
Thank you and best regards.
Yours sincerely,
Haiyan He
2014-09-30T00:00:00ZThe upgrading of roads in the Clermont/Kwadabeka area, Durban
http://hdl.handle.net/2263/5728
The upgrading of roads in the Clermont/Kwadabeka area, Durban
Shaik, M.J.; Allopi, D.R. (Dhiren)
Paper presented at the 23rd Annual Southern African Transport Conference 12 - 15 July 2004 "Getting recognition for the importance of transport", CSIR International Convention Centre, Pretoria, South Africa. The Reconstruction and Development Programme [RDP] started by the South African
Government some ten years ago has as its main ambition the provision of civil engineering
infrastructure to communities that severely lacked and still lack these essential services.
As such, a major component of this programme is to provide the essential road network to the
previously disadvantaged communities. However, this delivery programme has been somewhat
set back with various problems and the provision of black top roads to appropriate standards in
the Clermont and Kwadabeka area has in many cases proven to be a short term solution.
Many roads in this area have been upgraded from existing gravel to sealed blacktop standard
roads rather hurriedly. In many cases, the critical design elements have been overlooked and the
obvious results are roads with premature failure. Unfortunately a fair amount of roads in this
area have not even lasted up to half of their expected design life. The existing design procedure
adopted by the role players, or lack thereof, has in many cases resulted in the failure of a number
of roads in the area under investigation. Various factors linked to the immediate road conditions
ensure that a standard road design cannot be applied as a norm. Therefore, when designing to
upgrade an existing gravel road, a thorough investigation of all local factors should be carried
out.
This paper aims to investigate the current status and condition of the road network in the area
and also do an investigative analysis of road layerworks that have failed. Alternative designs and
proper maintenance plans will also be suggested for the area under investigation and other areas
with similar constraints.
This paper was transferred from the original CD ROM created for this conference. The material on the CD ROM was published using Adobe Acrobat technology. The original CD ROM was produced by Document Transformation Technologies Postal Address: PO Box 560 Irene 0062 South Africa. Tel.: +27 12 667 2074 Fax: +27 12 667 2766 E-mail: doctech@doctech.co.za URL: http://www.doctech.co.za
2004-07-01T00:00:00ZThe economic and social benefits of the Amadiba Road project
http://hdl.handle.net/2263/5727
The economic and social benefits of the Amadiba Road project
Little, R.D.; Lachman, A.
Paper presented at the 23rd Annual Southern African Transport Conference 12 - 15 July 2004 "Getting recognition for the importance of transport", CSIR International Convention Centre, Pretoria, South Africa. Amadiba Road is a community-based, labour-intensive, 40 km long gravel road in the north-eastern corner of the Eastern Cape. It was requested by a poor community who had no real roads and needed access to the nearest towns, Port Edward and Bizana. It was also desirable for the purpose of opening up the area to tourism opportunities, surely the industry with the best prospects for employment. The area is one of unspoilt natural beauty and plant life, being in the Pondoland Centre of Endemism, so special care had to be taken not to affect the environment. The project was innovative in the type of contract employed, and in the type of bridges and drifts used. Of the construction funds 55% were spent on wages, 5% on local goods and services and 20% on local haulage contractors resulting in 80% of the funds remaining in the community with the consequent multiplier effect.
This paper was transferred from the original CD ROM created for this conference. The material on the CD ROM was published using Adobe Acrobat technology. The original CD ROM was produced by Document Transformation Technologies Postal Address: PO Box 560 Irene 0062 South Africa. Tel.: +27 12 667 2074 Fax: +27 12 667 2766 E-mail: doctech@doctech.co.za URL: http://www.doctech.co.za
2004-07-01T00:00:00ZPublic transport : a new planning paradigm required to succeed
http://hdl.handle.net/2263/5726
Public transport : a new planning paradigm required to succeed
Kingma, Ron
Paper presented at the 23rd Annual Southern African Transport Conference 12 - 15 July 2004 "Getting recognition for the importance of transport", CSIR International Convention Centre, Pretoria, South Africa. In the 1950’s public transport in South Africa was at its pinnacle. The major cities enjoyed
extensive networks of rail, bus and tram systems. Not only did these systems operate without
subsidy, but the operator paid the authorities for the rights to operate on routes.
During the 1960’s authorities adopted the North American Transportation Planning approach
focusing primarily on private cars. Freeways were built, arterials were widened, tramlines
were buried under bitumen and footway widths were reduced to accommodate parking. This
private car planning philosophy has prevailed for almost half a century.
With the latest policy documents and National Land Transport Transitional Act No.22, 2000
there is a renewed emphasis on putting public transport first. In order to implement this
policy a new transport-planning paradigm is required. This paper investigates a new
paradigm which truly puts public transport and the people first, as opposed to the existing
paradigm which treats public transport and people as a by product to private vehicles.
This paper was transferred from the original CD ROM created for this conference. The material on the CD ROM was published using Adobe Acrobat technology. The original CD ROM was produced by Document Transformation Technologies Postal Address: PO Box 560 Irene 0062 South Africa. Tel.: +27 12 667 2074 Fax: +27 12 667 2766 E-mail: doctech@doctech.co.za URL: http://www.doctech.co.za
2004-07-01T00:00:00Z