Control algorithm for pitch of controllable pitch propeller and rotating speed of host machine in stable navigation state of ship

A technology of control algorithm and rotational speed, applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve the problem that fuel efficiency and maneuverability are difficult to have at the same time, and achieve the effect of good maneuverability and high fuel efficiency of ships

Active Publication Date: 2012-02-15
HANGZHOU HEMAI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is often difficult to have both fuel efficiency and maneuverability, and a trade-off must be made to a certain extent, and optimal control is required

Method used

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  • Control algorithm for pitch of controllable pitch propeller and rotating speed of host machine in stable navigation state of ship
  • Control algorithm for pitch of controllable pitch propeller and rotating speed of host machine in stable navigation state of ship

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Effect test

Embodiment 1

[0017] The thrust P obtained by the ship through the propeller is a key indicator to measure the maneuverability of the ship. The acceleration obtained by the ship is directly related to the thrust P, which can be expressed as formula (12):

[0018] m*a=P-R (12) In the formula, m is the total weight of the ship, a is the acceleration, and R is the total resistance of the ship. When the P value is larger, the acceleration of the ship is greater and the maneuverability is better. The thrust P can be expressed as formula (1):

[0019] P=K P ρn 2 D. P 4 (1) In the formula, ρ is the density of water, K P is the thrust coefficient, n is the rotational speed, D P is the paddle diameter, which can be expressed as formula (2):

[0020] K P =a 1 lambda p 2 +a 2 lambda p +a 3 (2) In the formula, a 1 、a 2 、a 3 is the curve fitting parameter of propeller dripping water test results, λ p can ...

Embodiment 2

[0037] Implementation method of optimal control algorithm with load protection:

[0038] Divide the rotational speed n into 500 equal parts and the pitch H into 100 equal parts, then establish a two-dimensional array of criterion J[500][100], power W[500][100] and condition B[500][100] (condition B[500][100] is a two-dimensional array value, used to judge TRUE or FALSE), according to (1)-(10) formula statistics J[i][j], W[i under the conditions of each pitch and speed ][j] value, and W under the speed condition 外 value, when W[i][j] and W 外 When relation (8) is satisfied, the value of B[i][j] is TRUE, otherwise it is FALSE. The patented algorithm is to obtain the maximum value of J[i][j] under the condition that B[i][j] is TRUE through the query sorting algorithm, and the n and H values ​​at this time are the control target values.

[0039] The present invention is further explained by a set of specific numerical values. The water density in the formula ρ = 1, the propelle...

Embodiment 3

[0041] Such as figure 1 As shown, taking one of the controllable pitch propeller control systems of the optimal starting algorithm of the present invention as an example, the working process of the present invention is described in detail.

[0042] The control system uses the high-speed and reliable CAN bus as the transmission carrier of digital information, and uses the high-performance ARM7 chip as the main control chip. It is designed and developed with information processing, optimal matching control, system status monitoring, host overload protection, information storage, etc. Functional modular controllable pitch propeller embedded control system. The high-performance embedded control host takes the high-performance ARM7 CPU chip as the core, uses the multi-channel isolated CAN bus as the communication means, and is equipped with large-capacity program memory, data memory and large-capacity solid-state data recording chip.

[0043] The operating frequency of the high-pe...

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Abstract

The invention relates to a control algorithm for a pitch of a controllable pitch propeller and a rotating speed of a host machine in a stable navigation state of a ship. The method comprises the following steps that: (1), a thrust P is obtained by a formula; (2), a ship efficiency is obtained by a formula; (3), a current output power W of the ship is obtained by a formula; (4), a control criterion J is obtained by a formula according to the thrust P, the ship efficiency and the current output power W of the ship; (5), a rotating speed n is equally divided into 500 parts and a pitch H is equally divided into 100 parts; and a two-dimensional array is established; when a relationship between W [i] [j] and W(external) satisfies that the W [i] [j] is less than and equal to the W(external) and J [i] [j] reaches a maximum value, the rotating speed n and the pitch H are controlled target values. Beneficial effects of the optimized control algorithm are as follows: a rotating speed n and a pitch H are obtained though an algorithm, so that an optimized control objective including the maximum host output power, the highest fuel efficiency and the best ship maneuvering property is realized.

Description

technical field [0001] The invention relates to a control algorithm for the pitch of the pitch propeller and the rotational speed of the main engine when the ship is in level sailing state, in particular to an optimal matching control algorithm for the pitch of the pitch propeller and the rotational speed of the main engine in the level sailing state of the ship with load protection. Background technique [0002] The modern shipbuilding industry is gradually developing towards large tonnage, low energy consumption, and high automation. The main manifestations are that digital technologies based on electronics, computers, and automatic control are widely used in various aspects of the ship control system, and digital precision automatic adjustments are used to replace traditional manual operations. Adjustment, thereby greatly improving the automation level of ship control, realizing the optimal matching of working parameters of the ship under various working conditions, thereb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
Inventor 蒋凯汤亚伟叶珊珊叶树明
Owner HANGZHOU HEMAI TECH
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