CN105197005A - Method for matching engines and propellers of hovercraft - Google Patents

Abstract

The invention relates to the control field of hovercraft, in particular to a method for matching engines and propellers of hovercraft, which comprises steps: the resistance of a hovercraft, the rotating speed and the screw pitch of air propellers are obtained by collecting the speed of the hovercraft in a situation with environmental disturbance; engine propeller matching points of the hovercraft are matched and obtained in a uniform velocity direct route work condition when the accelerated speed of the hovercraft is zero and directly routes in a uniform velocity; and the transition process is matched when the accelerated speed of the hovercraft is not zero during the transition process. The method for matching engines and propellers of hovercraft enables hovercraft gas turbines and propellers to match by analyzing and developing uniform velocity direct route and transition process of the hovercraft. The influence of the change of different work conditions to the hovercraft is considered during analyzing. The power sent from the gas turbines is completely utilized, and the efficiency of the propellers is also improved. The method for matching engines and propellers of hovercraft can meet design demands, and is high in economic benefits, thereby achieving the purpose of green driving.

Description

A kind of method of air cushion vehicle z-type propulsion

Technical field

The present invention relates to the control field of air cushion vehicle, be specifically related to a kind of method of air cushion vehicle z-type propulsion.

Background technology

Air cushion vehicle, in operational process, obtain higher performance driving economy, depends on the one hand the performance of ship, machine, oar itself, on the other hand and the rational pattern selecting propeller system, make full use of ship, machine, oar registration property have substantial connection.When air cushion vehicle requires to run with a certain stable speed of a ship or plane, consider the speed of a ship or plane of air cushion vehicle, the rotating speed of automotive gas turbine, and the rotating speed of air screw and pitch angle, the balance realized between air cushion vehicle machine oar is mated by suitable circulation.The boat state of air cushion vehicle in this process, operational factor and the load of automotive gas turbine and air screw do not change.But air cushion vehicle service conditions is constantly change, as the change of boats and ships load, external condition is as the change of wind.This with regard to need the operational factor of continuous regulating gas turbine and air screw come satisfied different operating mode operation change.Research air cushion vehicle machine oar registration property Changing Pattern, has great importance for the economy improving air cushion vehicle operation.

In order to enable air cushion vehicle adapt to various operating mode, and reaching operating needs, at present more research having been done to the type selecting of automotive gas turbine and propelling unit.The mechanisms such as naval equipment research institute and many colleges and universities all once did simulation study to air cushion vehicle propulsion system.But also few to the research of air cushion vehicle z-type propulsion, especially the matching correct of transient process is less.

Summary of the invention

The object of the present invention is to provide a kind of change for making air cushion vehicle adapt to various operating mode, can both operating needs be reached, and have best economy, reach the object of saving the energy energy, realize the method for the green air cushion vehicle z-type propulsion driven.

The object of the present invention is achieved like this:

(1) when there being ambient interference, gathering the speed of a ship or plane V of air cushion vehicle, obtaining resistance air cushion vehicle R, the rotating speed n of air screw and pitch

(2) coupling when at the uniform velocity sailing through to when air cushion vehicle acceleration/accel is zero, obtain the speed of a ship or plane information of air cushion vehicle, calculate the effective horse power of air cushion vehicle respectively, air screw push away power and combustion turbine power, by the effective horse power curve of air cushion vehicle, the horsepower curve pushing away horsepower curve and automotive gas turbine of air screw represents under the same coordinate system, and the intersection point of trying to achieve them is the z-type propulsion point of the air cushion vehicle of at the uniform velocity sailing through under operating mode;

(3) when air cushion vehicle acceleration/accel is non-vanishing and the coupling of transient process, on the basis of step (2), according to combustion turbine power, specific pitch is tried to achieve under speed point, new speed point V is fed back to air cushion vehicle z-type propulsion module, with numerical algorithm by iterating, obtaining the corresponding speed of a ship or plane and pitch, trying to achieve the speed of a ship or plane under combustion turbine power and required pitch, complete the coupling of transient process.

The beneficial effect that the technical scheme that the present invention proposes is brought is:

By at the uniform velocity sailing through to air cushion vehicle and the analytical investigation of transient process, air cushion vehicle automotive gas turbine and screw propeller can be mated.Further, the impact of change on air cushion vehicle of different operating mode is considered in analysis.Even if therefore under the complex environment of varying duty, air cushion vehicle also can reach Design Speed according to designing requirement and can smooth operation.The power that now automotive gas turbine sends is fully used, and the efficiency of screw propeller is also improved.Not only enable air cushion vehicle meet design requirement, and economic benefit is higher, reaches green target of driving.

Accompanying drawing explanation

Fig. 1 is the inventive method diagram of circuit.

Detailed description of the invention

Below in conjunction with accompanying drawing, the invention will be further described.

The invention discloses a kind of method of air cushion vehicle z-type propulsion, comprise the matching process of matching process when at the uniform velocity sailing through to and transient process.Described method comprises data acquisition, analytical calculation, output and execution.Obtain the speed of a ship or plane information of air cushion vehicle, under the same coordinate system, indicate air cushion vehicle effective horse power curve, screw propeller pushes away horsepower curve, coupling when combustion turbine power curve is at the uniform velocity sailed through to; At the uniform velocity sailing through on the basis of coupling, setting combustion turbine power, obtains the new speed of a ship or plane, the new speed of a ship or plane feeds back to air cushion vehicle z-type propulsion module, iterates, and obtains the corresponding speed of a ship or plane and pitch, try to achieve the speed of a ship or plane under specific combustion turbine power and required pitch, complete the coupling of transient process.The present invention is by the coupling to air cushion vehicle automotive gas turbine and air screw, and gas turbine proficiency is fully utilized, and air screw efficiency significantly improves, and reaches the object of saving the energy.

As shown in Figure 1, process is as follows for the square ratio juris of a kind of air cushion vehicle z-type propulsion proposed by the invention:

1. when there being ambient interference, gathering the information such as the speed of a ship or plane V of some groups of air cushion vehicles, obtaining resistance air cushion vehicle R, the rotating speed n of air screw and pitch etc. information;

2. coupling when at the uniform velocity sailing through to when air cushion vehicle acceleration/accel is zero, now, obtain the speed of a ship or plane information of air cushion vehicle, calculate the effective horse power during air cushion vehicle difference speed of a ship or plane respectively, air screw push away power and combustion turbine power, by the effective horse power curve of air cushion vehicle, the horsepower curve pushing away horsepower curve and automotive gas turbine of air screw represents under the same coordinate system, and the intersection point of trying to achieve them is the z-type propulsion point of the air cushion vehicle of at the uniform velocity sailing through under operating mode;

3., when air cushion vehicle acceleration/accel is non-vanishing and the coupling of transient process, now, on the basis of step 2, given combustion turbine power, tries to achieve specific pitch under speed point, new speed point V feeds back to air cushion vehicle z-type propulsion module, with numerical algorithm by iterating, can obtain the corresponding speed of a ship or plane and pitch, trying to achieve the speed of a ship or plane under specific combustion turbine power and required pitch, complete the coupling of transient process.

The present invention mainly comprises the coupling of coupling when at the uniform velocity sailing through to and transient process, and described method comprises data acquisition, analytical calculation, output and execution.Coupling when at the uniform velocity sailing through to is the situation that air cushion vehicle acceleration/accel is zero; The coupling of transient process is the non-vanishing situation of acceleration/accel.By the coupling to air cushion vehicle automotive gas turbine and air screw, gas turbine proficiency is fully utilized, and propeller efficiency significantly improves, and reaches the object of saving the energy.When air cushion vehicle acceleration/accel is zero, under same coordinate, indicate air cushion vehicle effective horse power curve respectively, screw propeller pushes away horsepower curve, combustion turbine power curve, and the intersection point of three is matching point.When air cushion vehicle acceleration/accel is non-vanishing, given combustion turbine power P on the basis of step 2 _s, the speed of a ship or plane under specific pitch can be obtained.The new speed of a ship or plane feeds back to air cushion vehicle z-type propulsion module, iterates and exports the corresponding speed of a ship or plane and pitch, until output matching point, complete the coupling of transient process.

Accompanying drawing 1 is the diagram of circuit of air cushion vehicle z-type propulsion method, describes the process of z-type propulsion.

Object of the present invention realizes as follows:

Step 1: when there being ambient interference, gathers the information such as the speed V of some groups of air cushion vehicles, obtains resistance air cushion vehicle R, the rotating speed n of air screw and pitch etc. information;

Step 2: when air cushion vehicle acceleration/accel is zero, is stable state coupling.Now calculate effective horse power during the different speed of a ship or plane of air cushion vehicle respectively, air screw push away power and combustion turbine power.

Effective horse power P _ecomputing formula is:

P _E＝R·V(1)

In formula, R is the total drag of air cushion vehicle, and V is the speed of a ship or plane of air cushion vehicle;

Air screw push away power P _tEfor:

In formula, for the pitch angle of air screw, n is the rotating speed of air screw;

Combustion turbine power P _sfor:

P _S＝1.026·P _f+1.06·P _TE(3)

In formula, P _ffor power of fan, its computing formula is:

$P_f=4.85\·n_f^3\·{10}^{-7}---\left(4\right)$

In formula, n _ffor rotation speed of fan.

The resistance that air cushion vehicle will be subject to from the external world under operation, owing to only having when the thrust of ship resistance and air screw is equal, air cushion vehicle could with a certain speed of a ship or plane stable speed operation, and air screw sends thrust needs automotive gas turbine to send moment of torsion to drive.So only push away the intersection point of horsepower curve at air cushion vehicle effective horse power curve and air screw, air screw pushes away the point of intersection of horsepower curve and combustion turbine power curve, air cushion vehicle could with a certain speed of a ship or plane smooth operation.Can by air cushion vehicle effective horse power curve, air screw pushes away horsepower curve and combustion turbine power curve represents under same coordinate, tries to achieve coupling when air cushion vehicle is at the uniform velocity sailed through to.

Step 3: when air cushion vehicle acceleration/accel is non-vanishing is the coupling of transient process.Now, the change of the speed of a ship or plane will change air cushion vehicle all directions Impact direction, by (5) formula

$\left\{\begin{array}{c}m(\stackrel{\·}{u}-vr)=F_x\\ m(\stackrel{\·}{v}+ur)=F_y\\ I_x\stackrel{\·}{p}=M_x\\ I_z\stackrel{\·}{r}=M_z\end{array}\right.---\left(5\right)$

In formula: I _z---air cushion vehicle is around the moment of inertia of z-axis;

I _x---air cushion vehicle is around the moment of inertia of x-axis;

The quality of m---air cushion vehicle;

The longitudinal velocity of u---air cushion vehicle;

The side velocity of v---air cushion vehicle;

The heading rate of r---air cushion vehicle;

The angular velocity in roll of p---air cushion vehicle;

F _x, F _y, M _x, M _z---be the power in x, y-axis direction suffered by air cushion vehicle, the moment around x-axis and the moment around z-axis respectively.Known, the change of the air cushion vehicle speed of a ship or plane can change the stressed of air cushion vehicle all directions, and the change of these power affects the speed of a ship or plane conversely.Therefore, can on the basis of step 2 for transient process, given combustion turbine power P _s, when air screw rotating speed and pitch one timing, can in the hope of a fixed speed point, with measured velocity ratio comparatively, try to achieve specific pitch under speed point, solve differential equation of motion with numerical algorithm by iterating, new speed point V feeds back to air cushion vehicle z-type propulsion module, causes the change of air screw pitch, obtains new pitch.Setting accuracy is 0.1 °, if the difference of analysis pitch and interpolation gained pitch is in accuracy rating, exports corresponding speed and pitch, otherwise will assignment iteration.Try to achieve the speed of a ship or plane under specific combustion turbine power and required pitch, complete the coupling of transient process.

Claims (1)

1. a method for air cushion vehicle z-type propulsion, is characterized in that, comprises the steps:

(1) when there being ambient interference, gathering the speed of a ship or plane V of air cushion vehicle, obtaining resistance air cushion vehicle R, the rotating speed n of air screw and pitch

(2) coupling when at the uniform velocity sailing through to when air cushion vehicle acceleration/accel is zero, obtain the speed of a ship or plane information of air cushion vehicle, calculate the effective horse power of air cushion vehicle respectively, air screw push away power and combustion turbine power, by the effective horse power curve of air cushion vehicle, the horsepower curve pushing away horsepower curve and automotive gas turbine of air screw represents under the same coordinate system, and the intersection point of trying to achieve them is the z-type propulsion point of the air cushion vehicle of at the uniform velocity sailing through under operating mode;

(3) when air cushion vehicle acceleration/accel is non-vanishing and the coupling of transient process, on the basis of step (2), according to combustion turbine power, specific pitch is tried to achieve under speed point, new speed point V is fed back to air cushion vehicle z-type propulsion module, with numerical algorithm by iterating, obtaining the corresponding speed of a ship or plane and pitch, trying to achieve the speed of a ship or plane under combustion turbine power and required pitch, complete the coupling of transient process.