Control algorithm for regulating paddle screw pitch and host revolving speed matching during startup of ship

A technology of control algorithm and pitch, applied in the direction of adaptive control, general control system, control/adjustment system, etc., can solve problems such as overload and no effective solution, and achieve the effect of ensuring thrust output

Active Publication Date: 2013-02-20
HANGZHOU HEMAI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the actual use of controllable pitch propellers, how to dynamically adjust the matching of the main engine speed and pitch, so that the maximum output power of the main engine and the maximum thrust of the propeller can be guaranteed during the start-up process of the ship, and at the same time, the overload of the main engine can be avoided. There is no effective solution to the problem of fastest startup

Method used

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  • Control algorithm for regulating paddle screw pitch and host revolving speed matching during startup of ship

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Experimental program
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Embodiment 1

[0018] 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): m*a=P-R (12) where m is the total weight of the ship, a is the acceleration, and R is the total resistance of the ship.

[0019] When the P value is larger, the acceleration of the ship is greater and the maneuverability is better. Thrust P can be expressed as formula (1): P=K P ρn 2 D. P 4 (1) where ρ is the density of water, K P is the thrust coefficient, n is the rotational speed, D P is the paddle diameter. Thrust coefficient K P For: 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 is the advancing speed coefficient: λ p =(1-ω)H / D P (3).

[0020] Since the total resistance of the ship (including friction resistanc...

Embodiment 2

[0037] A set of specific numerical values ​​obtained through experiments will further explain the present invention. The water density in the formula ρ=1, the propeller diameter D p =2, wake coefficient ω=0.2, total resistance constant coefficient ζ=2, navigating wet area Ω=100, comprehensive transmission efficiency η c = 0.9, hull efficiency η s = 0.9,k 1 =0.3,k 2 =0.7,k 3 = 0.5,k 4 =0.5. The rotational speed n is divided into 10 equal parts, and the pitch H is divided into 5 equal parts, so that n is 0-9 and H is 0-4. The ship has just started, at this time H is 0, n is 0, substituting formulas (1) to (9) to obtain J 1 =0.000000, as the current J 1 value. When H is 0 and n is 1, get J 1 =2.737294, and with the current J 1 Compare, greater than the current value. Take H as 0 and n as 1. By analogy, take out J with n ranging from 0 to 9 and H ranging from 0 to 4 1 value, and and the current J 1 value (i.e. H is 0, n is 0 for J 1 value) comparison. When the obt...

Embodiment 3

[0039] 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.

[0040] 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. The operating frequency of the high-performance...

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Abstract

The invention discloses a control algorithm for regulating paddle screw pitch and host revolving speed matching during the startup of a ship. The control algorithm comprises the following steps: (1) equally dividing n and H to obtain n present and H present; (2) obtaining thrust P according to a formula; (3) obtaining the current output power W of the ship according to a formula; (4) based on the obtained thrust P and current output power W of the ship, obtaining a control criterion J1 according to a formula; (5) obtaining distance J2 between a target and the current control target according to the formula; and (6) obtaining multiple groups of J1[i][j] according to a formula, substituting n[i] and H[j] into a formula to obtain the minimum J2[i][j], wherein the n[i] and the H[j] are target revolving speed n and target screw pitch H. The control algorithm has the beneficial effect that a host can reach the maximum output power along the optimal path and does not work in an overload mode during the startup of the ship according to the algorithm, and meanwhile, the maximum thrust output is guaranteed.

Description

technical field [0001] The invention relates to a control algorithm for matching the pitch of the pitch propeller and the rotational speed of the main engine when the ship is started, and in particular to a control algorithm for enabling the main engine to achieve the maximum output power along the optimal path without overloading while ensuring the maximum thrust output when the ship is started control algorithm. 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 va...

Claims

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Application Information

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Patent Type & Authority Patents(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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