Automated ship weight and center of gravity measurement system

Abstract

The automated ship weight and center of gravity measurement system of the present invention includes a weight and center of gravity measurement system console, a ship attitude acquisition system, and an oil transfer system; the ship attitude acquisition system and the oil transfer system are both connected to the weight and center of gravity measurement system console; the ship attitude acquisition system includes a draft sensor and a ship inclination measuring instrument; the oil transfer system includes a liquid level sensor; the weight and center of gravity measurement system console collects the measurement data from the draft sensor, the ship inclination measuring instrument, and the liquid level sensor, calculates the empty ship weight and center of gravity, the liquid tank weight and center of gravity, the variable loading weight and center of gravity, the departure calibration weight and center of gravity, and the cumulative deviation weight and center of gravity during river navigation, and obtains the overall ship weight and center of gravity based on the above five weight and center of gravity.

Description

Technical Field

[0001] This invention relates to ship weight and center of gravity measurement technology, specifically to an automated ship weight and center of gravity measurement system suitable for measuring the weight and center of gravity of ships during use. Background Technology

[0002] The center of gravity of a ship is fundamental to various performance calculations and is crucial during its daily operation. However, currently, the center of gravity is primarily measured through inclining tests, which are complex to prepare for and time-consuming. These tests are generally only conducted before the ship is completed and put into service, or during major overhauls. As a ship ages, its center of gravity often shifts compared to its initial construction state, causing crew members to misjudge the ship's center of gravity and leading to deviations in overall performance calculations. This, in turn, affects the ship's usability and can even create safety hazards. Summary of the Invention

[0003] The purpose of this invention is to provide an automated ship weight and center of gravity measurement system, which allows the crew to understand the ship's weight and center of gravity at any time during daily use, making it easier for them to grasp the overall performance of the ship and improve the safety of ship operation.

[0004] To achieve the above objectives, the present invention provides an automated ship weight and center of gravity measurement system, comprising a weight and center of gravity measurement system console, a ship attitude acquisition system, and an oil transfer system; the ship attitude acquisition system and the oil transfer system are both connected to the weight and center of gravity measurement system console; the ship attitude acquisition system includes a draft sensor and a ship inclination measuring instrument; the oil transfer system includes a level sensor; the total ship weight is denoted as... The ship's center of gravity is located at The empty ship's weight is The center of gravity of the empty ship is located at The weight of the liquid tank is The center of gravity is ; Variable load weight is The center of gravity is The departure calibration weight is The center of gravity is The cumulative deviation weight during navigation is The center of gravity is ;have , , , , The control console of the weight center of gravity measurement system collects measurement data from the draft sensor, ship tilt measuring instrument and liquid level sensor, and calculates the center of gravity of each weight.

[0005] The aforementioned automated ship weight and center of gravity measurement system includes a pre-departure calibration process where a portion of the oil is transferred from a tank on one side of the ship to a tank on the other side, and then the oil is returned to its initial state. The ship's heel values ​​are measured using a ship inclination meter before, during, and after the oil transfer, and recorded as follows: , and The liquid level in the tanks before and after oil transfer is measured using a level sensor. Based on the liquid levels in the tanks before and after transfer, and the tank volume calculation table provided by the ship designer, the heeling moment generated by transferring oil from tanks on one side of the ship to tanks on the other side is calculated. Displacement and transverse epicenter height were obtained by looking up data from the hydrostatic data table. Floating center ordinate Vertical coordinates of the center of buoyancy The bow draft is obtained by measuring the draft sensor. stern draft ; Calculate the initial stability of the ship , , , ,get , , , ; The moment of inertia of the entire ship at the free surface.

[0006] The aforementioned automated ship weight and center of gravity measurement system includes, during ship operation, a... At this time, set The draft at the bow is obtained by measuring the draft sensor. stern draft The ship's heel value is obtained through a ship inclination meter. ,get , ,have , .

[0007] The aforementioned automated ship weight and center of gravity measurement system involves measuring the ship's draft using a draft sensor before departure, and then calculating the total ship weight based on the ship's draft and hydrostatic data provided by the ship designer. , as the initial value.

[0008] The aforementioned automated ship weight and center of gravity measurement system includes, among other things, the empty ship weight. The position of the center of gravity of an empty ship Provided by the ship designer, and pre-stored in the weight and center of gravity measurement system console.

[0009] The aforementioned automated ship weight and center of gravity measurement system includes the measurement of liquid tank weight. Center of gravity The liquid level is obtained by measuring the liquid level in each liquid tank using a liquid level sensor.

[0010] The aforementioned automated ship weight and center of gravity measurement system includes a ship with... Each liquid tank has a level sensor to measure its liquid level, thus obtaining the liquid level height of each tank. The weight of each tank is then calculated based on the liquid level height and the tank volume calculation table provided by the ship designer. Center of gravity position and free surface moment of inertia , ; , , , Moment of inertia of the entire ship at the free surface .

[0011] The aforementioned automated ship weight and center of gravity measurement system includes variable loading weight. Center of gravity position This information is obtained through the registration of non-fixed loads on board the ship.

[0012] The aforementioned automated ship weight and center of gravity measurement system includes a ship with... There are several non-fixed loads, each with a weight of [missing information]. The center of gravity is , , , , , The weight of each non-fixed load. Center of gravity position Calculated based on non-fixed load registration information.

[0013] The aforementioned automated ship weight and center of gravity measurement system includes the following features: during ship operation, the empty ship's center of gravity remains unchanged; the liquid tank's center of gravity is obtained in real time by liquid level sensors; the variable load's center of gravity is changed based on non-fixed load registration information; the departure calibration's center of gravity remains unchanged until the next calibration; and the cumulative deviation's center of gravity during navigation is obtained in real time based on draft, heel, and trim values.

[0014] Compared with the prior art, the beneficial technical effects of the present invention are:

[0015] Compared with existing technologies, this invention can measure the ship's center of gravity in a timely manner during ship use, reducing measurement costs and time, enabling crew members to grasp the overall status of the ship more promptly and accurately, reducing their workload, and improving the ship's automation level and operational safety; the automated ship center of gravity measurement system of this invention can help crew members measure the ship's center of gravity automatically and quickly. Attached Figure Description

[0016] The automated ship weight and center of gravity measurement system of the present invention is given by the following embodiments and figures.

[0017] Figure 1 This is a schematic diagram of an automated ship weight and center of gravity measurement system according to a preferred embodiment of the present invention.

[0018] Figure 2 This is a flowchart of an automated ship weight and center of gravity measurement process in a preferred embodiment of the present invention. Detailed Implementation

[0019] The following will combine Figures 1-2 The automated ship weight and center of gravity measurement system of the present invention will be described in further detail.

[0020] Figure 1 The diagram shown is a schematic diagram of an automated ship weight and center of gravity measurement system according to a preferred embodiment of the present invention. Figure 2 The diagram shown is a flowchart of an automated ship weight and center of gravity measurement process in a preferred embodiment of the present invention.

[0021] See Figure 1 The automated ship weight and center of gravity measurement system in this embodiment includes a weight and center of gravity measurement system console, a ship attitude acquisition system, and an oil transfer system;

[0022] The ship attitude acquisition system includes equipment such as a monitoring and data acquisition box, a draft sensor, and a ship tilt measuring instrument.

[0023] The oil transfer system includes equipment such as a monitoring and data acquisition box and a liquid level sensor.

[0024] The weight and center of gravity measurement system console is located in the ship's electromechanical control room, and the ship's attitude acquisition system and the oil transfer system are both connected to the weight and center of gravity measurement system console.

[0025] See Figure 2 The automated ship weight and center of gravity measurement system of this embodiment is used to measure the ship's weight and center of gravity as follows:

[0026] The total weight of the ship is The ship's center of gravity is located at The empty ship's weight is The center of gravity of the empty ship is located at The weight of the liquid tank is The center of gravity is ; Variable load weight is The center of gravity is The departure calibration weight is The center of gravity is The cumulative deviation weight during navigation is The center of gravity is ;have , , , , .

[0027] A ship's weight and center of gravity change during use; therefore, the total weight of the ship during use... Center of gravity position For variables.

[0028] Before a ship sets sail, its draft can be measured by the ship's attitude acquisition system's draft sensors, and the total weight of the ship can be calculated based on the ship's draft and the hydrostatic data provided by the ship designer. As an initial value, when obtaining the ship's draft, draft sensors should be used to measure the draft at the bow, port midship, starboard midship, and stern. Multiple sets of data should be collected at each sampling point, and the average value is taken as the final ship draft. This calculation method eliminates the influence of waves and the ship's roll and pitch. The hydrostatic data provided by the ship designer is pre-stored in the weight and center of gravity measurement system console. The draft sensor measurement data is transmitted to the weight and center of gravity measurement system console, which calculates the total ship weight. The calculation method can employ existing technology, which will not be elaborated upon here, but will not affect the implementation of this embodiment.

[0029] (1) Weight of empty ship The position of the center of gravity of an empty ship Provided by the ship designer, and is a fixed value. Lightship weight. The position of the center of gravity of an empty ship It is pre-stored in the weight and center of gravity measurement system console.

[0030] (2) Weight of the liquid tank Center of gravity The liquid level is obtained by measuring the liquid level in each tank through the liquid level sensor of the oil transfer system, as follows: Assume the ship has Each liquid tank has a level sensor to measure its liquid level, thus obtaining the liquid level height of each tank. The weight of each tank is then calculated based on the liquid level height and the tank volume calculation table provided by the ship designer. Center of gravity position and free surface moment of inertia , ; , , , Moment of inertia of the entire ship at the free surface To obtain the liquid level of each tank, multiple sampling points are set up for each tank, and multiple sets of data are collected at each sampling point. The average value is then used to determine the final liquid level of that tank. This calculation method eliminates the influence of waves and the ship's roll and pitch. The tank volume calculation table provided by the ship designer is pre-stored in the weight and center of gravity measurement system console. The measurement data from the liquid level sensor is transmitted to the weight and center of gravity measurement system console for calculation. The weight of each tank... Center of gravity position and free surface moment of inertia The calculation method can be based on existing technology, which will not be elaborated in detail here, but will not affect the implementation of this embodiment.

[0031] During ship use, the weight of the liquid tank Center of gravity position It can be obtained through real-time measurement.

[0032] (3) Variable load weight Center of gravity position This information is obtained through the registration of non-fixed loads on board the ship. Ships require crew members to register non-fixed loads, such as their weight and location. This registration information is stored in the weight and center of gravity measurement system control panel. If the non-fixed loads change during the ship's operation, the registration information in the weight and center of gravity measurement system control panel is updated. Assume the ship has... There are several non-fixed loads, each with a weight of [missing information]. The center of gravity is , , , , , .

[0033] The weight of each non-fixed load is calculated using the non-fixed load registration information. Center of gravity Existing technologies can be used, which will not be elaborated here, but will not affect the implementation of this embodiment.

[0034] Variable load weight during ship operation Center of gravity position Changes were made based on modifications to the non-fixed load registration information.

[0035] (4) Before departure, a departure calibration was performed to obtain the required data. and Specifically, the process is as follows: A portion of the oil is transferred from a tank on one side of the ship to a tank on the other side, and then the oil is returned to its initial state. The ship's tilt measurement instrument, used in the ship's attitude acquisition system, measures the roll value before, during, and after the oil transfer, and records these values ​​as follows: (Before the rebuttal) (Under mediation) and (After transfer); The liquid level in the oil tanks before and after transfer is measured using the liquid level sensors of the oil transfer system. Based on the liquid levels in the tanks before and after transfer, and the tank volume calculation table provided by the ship designer, the center of gravity positions of the two tanks before and after transfer are determined, and the heeling moment generated by transferring oil from one tank on one side of the ship to another is calculated. Displacement and transverse epicenter height were obtained by looking up data from the hydrostatic data table. Floating center ordinate Vertical coordinates of the center of buoyancy The bow draft is obtained by measuring the draft sensor of the ship's attitude acquisition system. stern draft ; Calculate the initial stability of the ship , , , ,get , , , .

[0036] Get , and All calculations employ the method of averaging; the hydrostatic data tables are pre-stored in the weight and center of gravity measurement system control panel; the calculations are performed by the weight and center of gravity measurement system control panel. Heeling moment. The calculation method uses existing technology.

[0037] During ship use, voyage calibration weight Center of gravity position It remains unchanged until the next calibration. After calibration, the accumulated deviation weight during navigation is returned to zero.

[0038] (5) During the use of a ship, its displacement will change. At this time, set The bow draft is obtained by measuring the draft sensor of the ship's attitude acquisition system. stern draft The ship's heel value is obtained through the ship tilt measurement instrument of the ship attitude acquisition system. ,get , ,have , ;

[0039] (6) The weight and center of gravity measurement system control console calculates the overall weight and center of gravity of the ship based on the above 5 parts, and has: , , , , .

Claims

1. An automated ship weight and center of gravity measurement system, characterized in that, The system includes a weight and center of gravity measurement system console, a ship attitude acquisition system, and an oil transfer system; both the ship attitude acquisition system and the oil transfer system are connected to the weight and center of gravity measurement system console; the ship attitude acquisition system includes a draft sensor and a ship inclination measuring instrument; the oil transfer system includes a liquid level sensor. The total weight of the ship is The ship's center of gravity is located at The empty ship's weight is The center of gravity of the empty ship is located at ; The weight of the liquid tank is The center of gravity is ; Variable load weight is The center of gravity is The departure calibration weight is The center of gravity is ; The cumulative deviation weight during navigation is The center of gravity is ;have , , , , ; The control console of the weight center of gravity measurement system collects measurement data from the draft sensor, ship tilt measuring instrument and liquid level sensor, and calculates the center of gravity of each weight. Before departure, a pre-departure calibration is performed, transferring some oil from a tank on one side of the ship to a tank on the other side, and then returning the oil to its initial state. The ship's heel values ​​are measured using an inclination meter before, during, and after the oil transfer, and recorded as follows: , and The liquid level in the tanks before and after oil transfer is measured using a level sensor. Based on the liquid levels in the tanks before and after transfer, and the tank volume calculation table provided by the ship designer, the heeling moment generated by transferring oil from tanks on one side of the ship to tanks on the other side is calculated. Displacement and transverse epicenter height were obtained by looking up data from the hydrostatic data table. Floating center ordinate Vertical coordinates of the center of buoyancy The bow draft is obtained by measuring the draft sensor. stern draft ; Calculate the initial stability of the ship , , , ,get , , , ; The moment of inertia of the entire ship at the free surface.

2. The automated ship weight and center of gravity measurement system as described in claim 1, characterized in that, During the use of the ship, At this time, set The draft at the bow is obtained by measuring the draft sensor. stern draft The ship's heel value is obtained through a ship inclination meter. ,get , ,have , .

3. The automated ship weight and center of gravity measurement system as described in claim 2, characterized in that, Before a ship sets sail, a draft sensor is used to measure the ship's draft, and then the total weight of the ship is calculated based on the ship's draft and the hydrostatic data provided by the ship designer. , as the initial value.

4. The automated ship weight and center of gravity measurement system as described in claim 2, characterized in that, empty ship weight The position of the center of gravity of an empty ship Provided by the ship designer, and pre-stored in the weight and center of gravity measurement system console.

5. The automated ship weight and center of gravity measurement system as described in claim 2, characterized in that, Liquid tank weight Center of gravity The liquid level is obtained by measuring the liquid level in each liquid tank using a liquid level sensor.

6. The automated ship weight and center of gravity measurement system as described in claim 5, characterized in that, Assuming the ship has Each liquid tank has a level sensor to measure its liquid level, thus obtaining the liquid level height of each tank. The weight of each tank is then calculated based on the liquid level height and the tank volume calculation table provided by the ship designer. Center of gravity position and free surface moment of inertia , ; , , , Moment of inertia of the entire ship at the free surface .

7. The automated ship weight and center of gravity measurement system as described in claim 2, characterized in that, Variable load weight Center of gravity position This information is obtained through the registration of non-fixed loads on board the ship.

8. The automated ship weight and center of gravity measurement system as described in claim 7, characterized in that, Assuming the ship has There are several non-fixed loads, each with a weight of [missing information]. The center of gravity is , , , , , The weight of each non-fixed load. Center of gravity position Calculated based on non-fixed load registration information.

9. The automated ship weight and center of gravity measurement system as described in claim 2, characterized in that, During ship operation, the center of gravity of the empty ship remains unchanged; the center of gravity of the liquid tank weight is obtained in real time by liquid level sensors; the center of gravity of the variable load weight changes according to the non-fixed load registration information; the center of gravity of the departure calibration weight remains unchanged until the next calibration; the center of gravity of the cumulative deviation weight during navigation is obtained in real time by measuring the draft, heel and trim values.

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