1. Purpose and Significance（including domestic and foreign research status）

1.1 Purpose

Design a truck body system, frame system and suspensions for a kind of heavy-duty unmanned electric container transporter used in container port.

1.2 Domestic and foreign research status

By the end of 2017, among the top ten ports in the world, China occupies six out of ten, and Shanghai Port has annual throughput of 36.54 million standard containers.The annual throughput of Chinese ports exceeds 200 million standard containers. Although the slowdown in economic growth has led to slower growth in container throughput, it is still considerable in terms of quantity. In addition to the construction of the “One belt and one road”, even if the growth of container throughput slows down, the overall momentum of growth will not change.

In order to improve transportation efficiency, reduce costs, streamline management, and improve port transportation environment, etc., one of the development trends of container terminals is to promote the development of container terminals in the direction of automation and intelligence. The heavy-load unmanned electric container transport vehicles (AGV) is a key link in the automation and intelligentization of container terminals.

From the middle and late 1980s, Thames Port in the United Kingdom, Port of Rotterdam in the Netherlands, and Kawasaki Port in Japan took the lead in attempting to develop the automation technology of the port, but it was once stopped due to the influence of related technologies and financial factors. The limitation of the development of AGV is mainly related to the constraints of related technologies and supporting issues that have not been solved, including AGV guidance technology, AGV drive system and frame design, and high initial investment.

Until 1993, the Dutch port of Rotterdam became the world’s first automated container terminal. Today, automated dock technology has developed into the fourth generation. Up to now, there are three major automation terminals in China's mainland: Xiamen Automation Terminal, Yangshan Port Phase IV Automation Terminal and Qingdao Port Container Terminal. Many other ports are also seeking solutions for port automation and intelligence.

As one of the key links in port automation and intelligentization, AGV itself involves many key technologies, one of which is the design of AGV. The most obvious difference between port AGV and other AGV used indoor is that its work intensity is greater and the environment will be more varied. Therefore, the design of the heavy-duty unmanned electric container transporter at the port will directly affect the efficiency of the port.

At present, according to the container transportation way,the port AGV can mainly be divided into four modes: a direct transportation mode, an intermediate transportation mode, a carriage transportation mode, and without-carrier transportation mode. Nowadays, the carriage transport mode and the intermediate transport mode are more commonly used, and the transport vehicle body using the former mode needs to have a lifting device, while the transport vehicle body of the latter mode is not required.

The Ramp;D of the frame is similar to that of other automotive structural parts. This is similar at home and abroad. CAE is the tool that all auto companies need to use to develop the frame. It can accomplish some tests on the computer. If there is enough data, CAE can be used to make the corresponding three-dimensional model. When everything is available, simulation analysis and testing can be performed and objectively evaluated before the model has been manufactured. Currently, commercial CAE software is used at home and abroad to study three-dimensional modeling and finite element analysis of heavy-duty truck frames, and then there are many researches on the optimization of vehicle frames, mainly optimizing the stress distribution on the frame ,lightweight design of the frame and analyzing vibration of the frame.

1.3 Significance

The heavy truck frame can be said to be the most important in the car assembly because it not only bears the weight of itself and the cargo, but also withstands the impact of various loads. The frame together with suspension, are the main construction to make the truck to adapt vibration. And the body is the working platform to hold and carry container. Thus, this paper will focus on satisfying the need for port AGV about body,frame and suspension design. This paper can provide an reference for design of some basic construction of the heavy-load unmanned electric container transport vehicles (AGV). Besides, this paper is a great opportunities to synthetically utilize what I’ve learned in almost four years in university.

2. Basic content of this research,Prepared technical proposal and measures

2.1 Basic content of this research

2.1.1 Understand the development status of container ports and the application prospects of AGV;

2.1.2 Understand the composition and general arrangement of AGVs;

2.1.3 Select the type of frame and determine its parameters and material;

2.1.4 Model the frame;

2.1.5 Construct the finite element model of the frame and analyse it;

2.1.6 determine parameters of suspension and model it；

2.1.7 Construct the finite element model of suspension and analyse it;

2.1.8 Determine parameters of the body and model it;

2.1.9 Draw the engineering drawing of key parts;

2.1.10 Finish writing thesis.

2.2 Prepared technical proposal

The keys of this research are reasonably determining design parameters, modeling and analyzing by finite element method. In consideration of the working conditions of this kind of AGV, the frame, body and suspension are supposed to satisfy their working strength. Thus the practical requirement, the strength(the stiffness) are mainly used to determine the parameters.

After determine parameters, it is supposed to use UG to construct their three-dimension models. And the professional finite element analysis software Hypermesh to build and solve their finite element model. The results will be used to qualify the design parameters and the model. If the parameters or models are not qualified, they will be re-designed until satisfying both requests of utilization and limitation of strength(or stiffness). The engineering drawing can be printed out by transferring the three-dimensional models into two-dimensional models.

2.3 Flow diagram of this research

(In the attached document:Opening Report_杨俊（Yang Jun）)

3. Schedule

1-2（19^th and 20^th weeks of the 7^th semester） determine the topic of graduation design,related parameters for design and collect material

3（1^st week of the 8^th semester） Basically determine the plan,search data and finish opening report

（2^nd~3^rd weeks of the 8^th semester） Off-campus internship, off-campus information collection, completion of internship report

4（4^th week of the 8^th semester） Translate foreign thesis,collect more information

5~7（5^th ~7^th weeks of the 8^th semester ） Calculate parameters and draw sketch

(the end of 7^th week） Mid-term defense for thesis

8~10（8^th ~10^th weeks of the 8^th semester） Make drawing,writing specification for calculation(thesis)

11~13（11^th ~13^th weeks of the 8^th semester） Organize drawings and design calculation manuals, information kits, and conduct qualification review

14（14^th week of the 8^th semester） Students apply for a reply and prepare for reply; teachers review drawings and instructions

15~16（15^th ~16^th weeks of the 8^th semester） Participate in the defense and recommend Provincial Excellence

4. reference

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