CN102521512B - Computing method of torsional vibration critical speed of marine shafting - Google Patents
Computing method of torsional vibration critical speed of marine shafting Download PDFInfo
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- CN102521512B CN102521512B CN201110419051.4A CN201110419051A CN102521512B CN 102521512 B CN102521512 B CN 102521512B CN 201110419051 A CN201110419051 A CN 201110419051A CN 102521512 B CN102521512 B CN 102521512B
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- marine shafting
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Abstract
The invention relates to a new method of computing torsional vibration critical speed of marine shafting, which analyzes factors influencing torsional vibration of marine shafting to obtain a new computing formula ne=1/N *(ab/(a+b))<-(8.3+Bx)*10<-1>> of torsional vibration critical speed of marine shafting. The actual ship data is computed and is compared with the actual torsional vibration of marine shafting. The reliability of the computing method of the critical speed is validated reliably; and the method has strong actual value and significance for technologists in designing and manufacturing marine shafting to predict in advance and effectively reduce and avoid torsional vibration.
Description
Technical field
The present invention relates to boats and ships, the computing method of an important parameter shafting torsional oscillation critical rotary speed of using while specially referring to Ship Design, construction and use.
Background technology
Torsional oscillation be about kinematic train excitation frequency to natural frequency influence degree, reflected whether system exists the hazard level of resonance (resonance), it is main relevant with moment of inertia and the torsional rigidity of each component parts of system.The main cause that produces twisting vibration is the active moment of rotating machinery and the out of trim between counter torque of loading, torsional oscillation is due to transmission shaft nisi rigid body in essence, but there is elasticity, thereby in High Rotation Speed, the instantaneous velocity that different parts on transmission shaft can produce different sizes, out of phase rises and falls, and forms twisting back and forth and vibration along sense of rotation.Torsional oscillation has great destructiveness, and the tangential alternation twisting stress that the lighter makes to act on axle increases, and causes shear stress to surpass elastic limit, increases the fatigue damage of axle, reduces serviceable life, affects machine driven system safe operation; When serious, torsional oscillation can make axle system crack, and even damages or fracture, causes serious accident.
Marine propulsion shafting is comprised of many parts such as cardan shaft, intermediate shaft, stern tube shaft (propeller shaft) and shaft part at present, and this is a complicated multimass elastic system.The torsional oscillation of marine propulsion shafting is inevitable.If pay attention to the Torsional Vibration of marine shafting in the stages such as Ship Power Equipment design, manufacture, trial voyages or flight, carry out that torsional oscillation is subdued, calculating and the prediction of avoidance aspect necessity, just can make marine shafting not occur serious work problem, guarantee the normal payment of boats and ships, normally navigation and normally operation.In prior art, people often carry out the torsional vibration critical speed of Ship ' axle system from the angle of mechanics, but which often needs complex calculations and simulation.Somebody utilizes computer program to complete calculating, when its conclusion need to be waited until the actual trial voyage or flight of boats and ships, just can obtain.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, a kind of method of new Ship ' shafting torsional oscillation critical rotary speed is provided.Method of the present invention wants to utilize simple existing parameter, by simply calculating the critical rotary speed of torsional vibration, to instruct Ship Design, construction and operation.
In order to reach foregoing invention object, the technical scheme that patent of the present invention provides is as follows:
Computing method for torsional vibration critical speed of marine shafting, is characterized in that, the method comprises the steps:
1. determine the number of the screw propeller blade that need to measure boats and ships, the number of this blade represents with N;
2. according to the making material of marine shafting, measure the elastic modulus E of shaft based material, and measure the density G of shaft based material, measure the shaft length L between screw propeller and thrust bearing on boats and ships, according to above-mentioned parameter, calculate parameter a, wherein a=E/(GL
2);
3. calculate the flexible value k at thrust metal place, calculate the quality m of shaft system, and calculate the mass M of screw propeller when dry, calculating parameter M
e=m+2M, draws the size of parameter b, wherein, and b=k/M
e;
4. according to the tonnage at boatbuilding oceangoing ship, determine B
xthe size of value, wherein: B
x=[(D
x-D
29.7) * 10
3], B
xfor positive integer, D=
;
5. according to above-mentioned parameter, the critical rotary speed by following formula Ship ' shafting torsional oscillation is:
.
In the computing method of torsional vibration critical speed of marine shafting of the present invention, in described boats and ships, include bulk freighter and oil carrier, wherein 29.7 ten thousand tons of B corresponding to oil carrier
29.7=0.
In the computing method of torsional vibration critical speed of marine shafting of the present invention, the [(D of described step in 4.
x-D
29.7) * 10
3] the value taken integral part that is calculated value.
Based on technique scheme, the critical Speed Calculation method of torsional vibration of the present invention has following technique effect in actual applications:
1. the invention provides a kind of new, simple computing method to domestic and international classification society, marine shafting design, research and development institutes and correlation engineering technician, can, in the situation that there is no professional software, calculate fast torsional vibration critical speed of marine shafting.
2. method of the present invention does not need marine shafting to carry out Force Calculation, the analysis of complicated torsional oscillation aspect, does not need the torsional oscillation by real ship axle being to test yet, and just can verify science and the reliability of shafting design by the present invention.
3. method of the present invention can farthest provide the prediction of shafting torsional oscillation to stages such as Ship Power Equipment design, manufacture, trial voyages or flight, by suitable shafting torsional oscillation, subdue, avoid just farthest to make marine shafting not occur serious shafting torsional oscillation problem, guarantee the normal payment of boats and ships, normal navigation, normally operation.
Embodiment
Below we come the computing method of torsional vibration critical speed of marine shafting of the present invention to do further and elaborate in conjunction with specific embodiments, in the hope of check the practical value of the inventive method in practice process, but can not limit the scope of the invention with this.
The present invention is a kind of new method of Ship ' shafting torsional oscillation critical rotary speed, the method is first determined, relevant data, the parameter of Ship ' axle system, then the compute mode providing according to this method is carried out correlation computations, finally can draw torsional vibration critical speed of marine shafting.This critical rotary speed can instruct design, construction and the shipping process of boats and ships.
In actual applications, the detailed step of said method can design and be constructed to example by the ship type of 17.7 ten thousand tons of bulk freighters, and computing method of the present invention are done further and elaborated:
The first step, determine on boats and ships the number of sheets being connected on screw propeller with axle system, on 17.7 ten thousand tons of bulk freighters, screw propeller has 4 blades, so get N=4.
Second step, determine the making material of axle system, then measure the elastic modulus E of this material, the elastic modulus E of material in practical application=
n/mm
2, axle system makes the density G=of material
kg/mm
3, then calculate the bearing length L=between screw propeller and thrust bearing
mm, calculates the size of a value according to above-mentioned parameter, wherein, and a=
=
=4.27
.
The 3rd step, determine the flexible estimated value k=at thrust metal place
n/mm, the recommendation that this numerical value is classification society, calculates the quality m=38283 kg that above-mentioned axle is then, and this numerical value also can obtain by consulting this concrete axle system construction drawing.Quality when screw propeller is dry: M=42480kg, M
e=m+2M=38283+2 * 42480=123243 kg, draws the size of parameter b value, b=
=40.57;
The 4th step, the following formula of basis calculate torsional vibration critical speed of marine shafting n
esize: n
e=
,
Wherein: 1. for 29.7 ten thousand tons of oil carriers, i.e. VLCC, B
29.7=[(D
29.7-D
29.7) * 10
3]=0;
2. for 17.7 ten thousand tons of bulk freighters, B
17.7=[(D
17.7-D
29.7) * 10
3]; ([(D
17.7-D
29.7)
* 10
3] represent: (D
17.7-D
29.7) be multiplied by 10
3rear round numbers; [] is round numbers symbol)
3. the boats and ships of other types can be with reference to the situation that solves 17.7 ten thousand tons of bulk freighters.
17.7 ten thousand tons of required bulk freighter shafting torsional oscillation critical rotary speed n
e=
=
=?40?rpm；
Adopt the critical rotary speed value that computing method of the present invention are calculated that the prediction of shafting torsional oscillation can be farthest provided to stages such as Ship Power Equipment design, manufacture, trial voyages or flight, by suitably carrying out shafting torsional oscillation, subdue, avoid, farthest to avoid making boats and ships occur serious shafting torsional oscillation problem, guarantee the normal payment of boats and ships, normally navigation and normally operation.
Claims (3)
1. computing method for torsional vibration critical speed of marine shafting, is characterized in that, the method comprises the steps:
1. determine the number of the screw propeller blade that need to measure boats and ships, the number of this blade represents with N;
2. according to the making material of marine shafting, measure the elastic modulus E of shaft based material, and measure the density G of shaft based material, measure the shaft length L between screw propeller and thrust bearing on boats and ships, according to above-mentioned parameter, calculate parameter a, wherein a=E/(GL
2);
3. calculate the flexible value k at thrust metal place, calculate the quality m of shaft system, and calculate the mass M of screw propeller when dry, calculating parameter M
e=m+2M, draws the size of parameter b, wherein b=k/M
e;
4. according to the tonnage at boatbuilding oceangoing ship, determine B
xthe size of value, wherein: B
x=[(D
x-D
29.7) * 10
3], B
xfor positive integer,
;
5. according to above-mentioned parameter, the critical rotary speed by following formula Ship ' shafting torsional oscillation is:
.
2. the computing method of a kind of torsional vibration critical speed of marine shafting according to claim 1, is characterized in that, include bulk freighter and oil carrier in described boats and ships, wherein 29.7 ten thousand tons of B corresponding to oil carrier
29.7=0.
3. the computing method of a kind of torsional vibration critical speed of marine shafting according to claim 1, is characterized in that, the [(D of described step in 4.
x-D
29.7) * 10
3] represent the integral part that value taken is calculated value.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110419051.4A CN102521512B (en) | 2011-12-15 | 2011-12-15 | Computing method of torsional vibration critical speed of marine shafting |
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| CN201110419051.4A CN102521512B (en) | 2011-12-15 | 2011-12-15 | Computing method of torsional vibration critical speed of marine shafting |
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| CN102521512B true CN102521512B (en) | 2014-08-13 |
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| CN107609272A (en) * | 2017-09-12 | 2018-01-19 | 浙江海洋大学 | A kind of Calculation of Ship Grounding's rear axle mechanism safe speed of rotation collection of illustrative plates determines method |
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Non-Patent Citations (8)
| Title |
|---|
| 57000t散货船轴系振动实测分析与改进设计;于招阳等;《噪声与振动控制》;20110630;第2011年卷(第3期);全文 * |
| 7.6万吨级散货船轴系扭振性能改进的研究;王万华等;《造船技术》;20051216;第2005年卷(第6期总第268期);全文 * |
| 于招阳等.57000t散货船轴系振动实测分析与改进设计.《噪声与振动控制》.2011,第2011年卷(第3期), |
| 唐军等.船舶轴系扭振的消减与回避.《青岛远洋船员学报》.2004,第25卷(第2期), |
| 张海燕.船舶轴系扭振的产生及消减方法.《武汉船舶职业技术学院学报》.2009,第2009年卷(第2期), |
| 王万华等.7.6万吨级散货船轴系扭振性能改进的研究.《造船技术》.2005,第2005年卷(第6期总第268期), |
| 船舶轴系扭振的产生及消减方法;张海燕;《武汉船舶职业技术学院学报》;20090425;第2009年卷(第2期);全文 * |
| 船舶轴系扭振的消减与回避;唐军等;《青岛远洋船员学报》;20040630;第25卷(第2期);全文 * |
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| CN102521512A (en) | 2012-06-27 |
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