Discussion on 4900 truck ro ro ship

Talking about DNV Naut of 4900 truck ro ro ship

talking about DNV naut-aw design of 4900 truck ro ship

1 preface

the 4900 truck ro ship developed by Xiamen Shipbuilding Industry Co., Ltd. (hereinafter referred to as Xiamen shipbuilding industry) in 2004 is the first self-designed, developed and mass built in China. The design and R & D of the ship is aimed at the function, system, process and construction technology of the third generation Automobile Ro ro ship. This project adopts the method of preliminary design and detailed design carried out by Xiamen Shipbuilding Industry Co., Ltd. and German and Norwegian technical consulting companies, and the production design and construction process research independently carried out by Xiamen shipbuilding industry. Since there was no mature ship in the world at that time, this project belongs to the development of new products, with high technical content and high added value, and the market prospect is quite broad. After several years of shipping, this product is now called "Xiamen type" by the international shipping industry

naut-aw, commonly known as one-man bridge in shipyards, can be understood as: when driving narrow, one person can independently monitor the operation status of the ship and operate the ship according to relevant information, and can safely and effectively operate the ship with the close cooperation of two pilots if necessary

naut-aw design covers a wide range. Due to the in-depth understanding and close cooperation of relevant specifications in the design of 4900 truck ro ro ships, various disciplines, such as electric loading, internal loading, hull, overall and even external loading, basically meet the requirements of the classification society

dnv's naut-aw design requirements are the most stringent of all classification societies, and its specifications are the most specific and detailed. It has a more detailed description of the line of sight, glass windows, narrow driving working environment, channels, narrow driving height, driving console and its equipment. The naut-aw design of 4900 truck ro ro ship is designed according to the specifications of DNV classification society. The following is a brief description of the design of 4900 truck ro ship in these aspects

2 design of sight line and glass window in the cab

in order to meet the requirements of safe navigation and ship manoeuvring, the narrow driver should have sufficient vision. The driver is positioned above the front of the upper living compartment

. You can see the underwater 360 degree range outside in the cab. It is not required to implement at one point, but not more than 2 points. The observation points are on the left and right sides of the navigation and traffic monitoring station, and the distance between the two points is no more than 15 meters. The intersection of these two points through the rear wall glass window should not exceed the stern. Navigation and traffic monitoring and control workstation is the most important of all workstations, and the line of sight requirements of naut-aw are mainly for its layout. The vision requirements are as follows:

2.1 horizontal vision

in order to ensure the driver's forward horizontal vision when 350mm away from the navigation and traffic monitoring control station (010-090 degrees on the left and right sides), the height of the lower edge of the front wall glass window is 1000mm, and the height of the upper edge is 2000mm, so as to ensure that the driver has sufficient horizontal vision at the workstation (the eye height is l800mm when standing, and l 400mm when sitting)

the horizontal line of sight of the navigation and traffic monitoring control station shall not be less than 22.5 degrees, that is, from the bow to the rear of the left and right stop. Within this range, there should be no obstacles. The indoor reporting area and chart area are generally equipped with shading curtains, so these areas are set outside the 225 degree field of vision. The horizontal rear line of sight of the navigation and traffic monitoring control station is not less than 5 degrees behind the ship. Through the rear line of sight, you can see the reading light of the port, which is convenient to judge whether the ship leaves the port along the correct route. The design installs a glass window for the rear wall, with a specification of 1300ram high × The width is 2500mm, and the height of the lower edge is 1000mm. In this way, the requirements of rear sight are met

in order to make the helmsman steer safely in Dizhai waterway, the horizontal line of sight of the manual steering platform is 60 degrees to the left and 60 degrees to the right in the middle of the ship. The actual design is greater than 60 degrees

2.2 vertical line of sight

due to the narrow position of the driver (located above the front of the upper living compartment), the blocked bow sea of the command workstation, navigation workstation, traffic monitoring and control workstation (vertical) will not exceed the specification limit of 2 captains or 500m (whichever is the smaller) in any case (draft, loading, a

balance status). And the highest part of the driving console is designed to be 1200mm. The line of sight angle is O ~ OL0 degrees on the left and right sides. Ensure that the pilot can operate the ship in time according to the situation of the bow sea, so as to avoid an emergency

the vertical line of sight of the manual steering console is the same as that of the navigation and traffic monitoring control station

2.3 there is a window frame between the window glass and the window frame

there is a front mast in front of the cab, so there is a blind area in the underwater line of sight of the navigation and traffic monitoring control station, but the total blind area angle of these obstacles cannot exceed 30 degrees. The angle of each blind area cannot exceed 10 degrees. 7. Clamping mode: the blind area angle within the range of 10 degrees on the left and right of the automatic clamping room cannot exceed 5 degrees. The visual angle between the two blind areas cannot be less than 5 degrees. In order to reduce the blind spot angle, three methods are adopted:

(1) make the left and right breakwaters line up with the sitting position of the navigation and traffic monitoring control station

(2) the window frame should be as small as possible, especially the window frame that needs to reach the front of the screen (the stealing frame size is 100mm × 100mm)；

(3) the width of quotient shall be as large as possible, and the width of each quotient in the underwater line of sight of navigation and traffic monitoring control station shall not be less than 1200mm

after the above conditions are met, we should also consider how to ensure the clear vision of commercial glass in all kinds of weather to prevent direct sunlight. Transparent sunshades are installed in front of all glass windows

dnv believes that the glass window in front of the driver's console (i.e. the line of sight within 180 degrees) is the most important, so it is necessary to install a wiper and flushing system, and the glass window that realizes the rear view function also needs to install a wiper and flushing system. The water of the flushing system is composed of cold water and hot water, and pressurized with compressed air, which is provided by the engine room. In addition to installing two rotating glass windows, the deicing and demisting system also adopts electrically heated glass with temperature control switch and bypass switch

3 cab working environment design

3.1 the rest place

is designed to make the driver in a comfortable working environment. There is a rest area in the left rear part of the narrow driving area, equipped with sofas, coffee tables, refrigerators, coffee machines and hand sinks. In addition, the washroom (W.C) is narrow near the driver and behind the chart area

3.2 vibration and noise

due to the reasonable design of the hull structure, the data of measuring the vibration frequency, intensity and noise of the cab during the trial voyage of the first ship 403 and subsequent a have met the requirements of DNV specifications

3.3 temperature

there is enough temperature control system in the cab. The external temperature is - 10 ℃ ~ 35. Under the condition of C, the temperature is controlled at 14 ℃ ~ 30 ℃. The temperature gradient from the deck to 2 meters high is within ± 1 ℃ and not more than ± 4 ℃. The temperature control system adopts central air conditioning, and nine air distributors are installed in the cab. Each air distributor can adjust the air supply volume according to the actual needs. The higher the temperature, the greater the ventilation. Ventilation times shall not be less than 6 times/hour. Two 2kW electric heaters are also installed in the cab

3.4 surface treatment and color

the narrow interior floor of the driver's cab adopts the anti-skid rubber plastic floor with particles (also known as this kind of alloy can reduce the water absorption PVC floor of nylon), and the left and right wing areas adopt the

perforated rubber plastic floor that can drain water, so that the floor can maintain a non smooth surface under wet and dry conditions

in order to prevent the beverage facilities and other facilities that make the driver comfortable from damaging the driving console equipment and injuring the driver, sofas, coffee tables, beverage facilities, refrigerators, coffee machines, etc. are designed to be fixed. The telescope box is embedded in the inner decorative wall panel to avoid sharp edges and protrusions from damaging the driver. Stainless steel handrails are installed on the driving console and the narrow front wall of the driver to facilitate the driver to move or stand in bad weather

the driving console adopts matt paint to reduce the reflection of light. So the surface of the driving console looks rough. The ceiling of the driver's console area is dark green to reduce reflection and avoid affecting the driver's judgment

3.5 lighting

provide sufficient lighting to meet the lighting required by the bridge during navigation, port, day and night work. The illumination of each workstation is higher than that of other environments. In the actual design, it is not considered separately, but the illumination is increased in the chart area

to avoid light exposure and image reflection in the glass window and ceiling at night, drive narrow and nearby cabins, daytime: white, 0 ~ 3001ux. Each workstation of the driving console adopts red dimmable gooseneck lamps at night, 0 ~ 201ux; Close to the narrow passage and cabin of the driver, the door limit switch is adopted; In non enclosed stairs and cab, at night, we use white (color close to yellow) dimmable lights as stairway lights, 0 ~ 201ux. DNV accepted. The red light in the cab is the gooseneck light on the driving console

in the chart area, day and night: white spotlight, O ~ 300lux. We not only installed fluorescent lamps, but also adopted dimmable chart lamps. The dramatic edge of the chart area is shaded by a shading curtain to avoid night light from hitting the driving lane

radio console, night: Red dimmable lamps, 0 ~ 201ux. Gooseneck lamps are used, and the four dramas are shielded by shading curtains to prevent light from hitting the driver's seat

4-channel and cab clear height design

4.1-channel

front channel outside the cab (cat walk), with a width of about 700mm, is used for the installation and maintenance of wipers

there is a channel with a width of 1000mm between the driving console and the narrow front wall of the driver's seat, so as to ensure that one can be divided into: when one person is standing, another person can pass through according to the size deviation and appearance quality, strength and frost resistance

the distance between the left and right wing consoles and the front wall and the side of the ship is more than 1000mm, so as to meet the requirements of Panama specifications that two people can pass at the same time. There should be a passage with enough width between the left and right wings to meet the requirements that two people can pass at the same time. The width of the passage should be 1200mm, and the width at any obstacle point should not be less than 700mm. Therefore, the width of sliding doors on both sides is 1200mm

the channel between two independent consoles in the cab is not less than 700mm, for example, the distance between the manual steering console and the middle console of the driving console is greater than 700mm

4.2 cab; Fight for height

the clear height of the cab (paved with deck dressing and anti-skid rubber and plastic floor, installed with ceiling) 2loomm

the height of the top platform from the floor after installation shall not be less than 2100mm. If people don't need to pass under the stop, the height can be lower, and the design is 2000mm. In order to ensure the height of the top platform, the ceiling (about 3000 mm wide) within the scope of three glasses in the narrow front and the middle of the drive was raised by 215mm. The height of the top platform equipment is 300mm, which ensures that the height of the lower edge of the top platform after installation is not less than 2000mm

the height of the equipment on the outer roof of the driving narrow sliding door shall not be less than 2100mm