CN111284646A - Method and device for avoiding installation of host torsional vibration damper, ship and storage medium - Google Patents
Method and device for avoiding installation of host torsional vibration damper, ship and storage medium Download PDFInfo
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- CN111284646A CN111284646A CN202010063181.8A CN202010063181A CN111284646A CN 111284646 A CN111284646 A CN 111284646A CN 202010063181 A CN202010063181 A CN 202010063181A CN 111284646 A CN111284646 A CN 111284646A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H21/00—Use of propulsion power plant or units on vessels
- B63H21/30—Mounting of propulsion plant or unit, e.g. for anti-vibration purposes
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Abstract
The application discloses method, device, boats and ships and storage medium of avoiding installing host computer torsional vibration damper are applied to boats and ships, and boats and ships include host computer, jackshaft, bearing, propeller shaft, screw, flywheel and frequency modulation wheel, the method includes: acquiring the diameters of the intermediate shaft and the propeller shaft, the tensile strength of the intermediate shaft and the propeller shaft, and the rotational inertia of the flywheel and the frequency modulation wheel; according to the diameter, the tensile strength and the rotational inertia, the torsional vibration stress peak values of the intermediate shaft and the propeller shaft are obtained under the condition that one cylinder of the main engine is on fire; if the peak value of the torsional stress exceeds the preset instantaneous allowable stress, the diameter and/or the tensile strength and/or the moment of inertia are/is adjusted. This application can be through the diameter and the tensile strength of continuous adjustment jackshaft and propeller shaft, the moment of inertia of flywheel and frequency modulation wheel for the torsional vibration stress peak value of jackshaft and propeller shaft is no longer than the instantaneous stress of allowwing, thereby can avoid installing the torsional vibration shock absorber, has saved the cost greatly, installs simplyr.
Description
Technical Field
The present application relates to the field of ship manufacturing technologies, and in particular, to a method and an apparatus for avoiding installation of a host torsional vibration damper, a ship, and a storage medium.
Background
At present, with the improvement of the metallurgical technology level, the fatigue strength of the material is continuously improved. Until now, the tensile strength of the forged shaft of the classification society can reach 950MPa, namely the tensile strength of the materials required by the classification society specification can not exceed 950MPa, while the propulsion shaft on the ship is generally forged by carbon steel, when a main machine, particularly a five-cylinder machine, is subjected to torsional vibration calculation, because an intermediate shaft is limited by the tensile strength of the materials, if the calculated torsional vibration stress exceeds the instantaneous allowable stress required by the classification society, and even if the rotational inertia of a frequency modulation wheel or a flywheel can not meet the requirement, a torsional vibration damper must be installed at the front end of the main machine. For the torsional vibration damper, the price is usually 60-80 ten thousand yuan, and the cost is higher.
Disclosure of Invention
The present application is directed to solving at least one of the problems in the prior art. Therefore, the method, the device, the ship and the storage medium for avoiding installation of the host torsional vibration damper are provided, the host torsional vibration damper can be avoided being installed, the cost is greatly saved, and the installation is simpler.
According to the method for avoiding installing the host torsional vibration damper of the embodiment of the first aspect of the application, the method is applied to a ship, the ship comprises a host, an intermediate shaft, a bearing, a propeller shaft, a propeller, a flywheel and a frequency modulation wheel, the host is sequentially in transmission connection with the intermediate shaft, the bearing, the propeller shaft and the propeller, the flywheel and the frequency modulation wheel are respectively installed at two ends of the host, and the method comprises the following steps:
acquiring the diameters of the intermediate shaft and the propeller shaft, the tensile strength of the intermediate shaft and the propeller shaft, and the rotational inertia of the flywheel and the frequency modulation wheel;
according to the diameter, the tensile strength and the rotational inertia, obtaining the torsional vibration stress peak value of the intermediate shaft and the propeller shaft under the condition that one cylinder of the main engine is in fire;
and if the peak value of the torsional stress exceeds the preset instantaneous allowable stress, adjusting the diameter and/or the tensile strength and/or the moment of inertia.
The method for avoiding the installation of the torsional vibration damper of the main machine according to the embodiment of the application has at least the following beneficial effects: this application can be through the diameter of continuous adjustment jackshaft and propeller shaft, the tensile strength of jackshaft and propeller shaft, the moment of inertia of flywheel and frequency modulation wheel for the torsional vibration stress peak value of jackshaft and propeller shaft is no longer than the instant stress of allowwing of predetermineeing, thereby can avoid installing the torsional vibration shock absorber, has saved the cost greatly, and the installation is simpler.
According to some embodiments of the present application, said obtaining a peak torsional stress of said intermediate shaft and said propeller shaft in case of fire of one cylinder of said main machine according to said diameter, said tensile strength and said moment of inertia comprises:
and obtaining a torsional vibration curve of the intermediate shaft and the propeller shaft under the condition that one cylinder of the main engine is in fire according to the diameter, the tensile strength and the rotational inertia, and obtaining a torsional vibration stress peak value from the torsional vibration curve.
According to some embodiments of the application, the adjusting of the tensile strength comprises the steps of:
the intermediate shaft and the propeller shaft are changed from carbon steel to alloy steel.
The arithmetic device according to the second aspect of the present application comprises at least one control processor and a memory for communicative connection with the at least one control processor; the memory stores instructions executable by the at least one control processor to enable the at least one control processor to perform a method of avoiding installation of a host torsional vibration damper as described above.
According to the ship of the third aspect embodiment of the application, the ship comprises a main machine, an intermediate shaft, a bearing, a propeller shaft, a propeller, a flywheel, a frequency modulation wheel and the arithmetic device, wherein the main machine is in transmission connection with the intermediate shaft, the bearing, the propeller shaft and the propeller in sequence, and the flywheel and the frequency modulation wheel are respectively installed at two ends of the main machine.
According to a fourth aspect of the present application, there is provided a computer-readable storage medium having stored thereon computer-executable instructions for causing a computer to perform the method of avoiding installation of a host torsional vibration damper as described above.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a diagram of a computing device according to an embodiment of the present application;
FIG. 2 is a flow chart of a method for avoiding installation of a host torsional vibration damper according to one embodiment of the present application;
FIG. 3 is a partial block diagram of the interior of a ship according to one embodiment of the present application;
FIG. 4 is a flow chart illustrating a method for avoiding installation of a torsional vibration damper for a host according to another embodiment of the present application;
FIG. 5 is a schematic illustration of a torsional vibration curve of a method for avoiding installation of a host torsional vibration damper according to an embodiment of the present application;
FIG. 6 is a schematic illustration of a torsional vibration curve of a method of avoiding installation of a host torsional vibration damper according to another embodiment of the present application;
FIG. 7 is a schematic illustration of a torsional vibration curve of a method of avoiding installation of a host torsional vibration damper according to another embodiment of the present application;
FIG. 8 is a schematic illustration of a torsional vibration curve of a method for avoiding installation of a host torsional vibration damper according to another embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
In the description of the present application, it is to be understood that the positional descriptions, such as the directions of up, down, front, rear, left, right, etc., referred to herein are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present application.
In the description of the present application, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and larger, smaller, larger, etc. are understood as excluding the present number, and larger, smaller, inner, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present application, unless otherwise expressly limited, terms such as set, mounted, connected and the like should be construed broadly, and those skilled in the art can reasonably determine the specific meaning of the terms in the present application by combining the detailed contents of the technical solutions.
At present, with the improvement of the metallurgical technology level, the fatigue strength of the material is continuously improved. Until now, the tensile strength of the forged shaft of the classification society can reach 950MPa, namely the tensile strength of the materials required by the classification society specification can not exceed 950MPa, while the propulsion shaft on the ship is generally forged by carbon steel, when a main machine, particularly a five-cylinder machine, is subjected to torsional vibration calculation, because an intermediate shaft is limited by the tensile strength of the materials, if the calculated torsional vibration stress exceeds the instantaneous allowable stress required by the classification society, and even if the rotational inertia of a frequency modulation wheel or a flywheel can not meet the requirement, a torsional vibration damper must be installed at the front end of the main machine. For the torsional vibration damper, the price is usually 60-80 ten thousand yuan, and the cost is higher.
Based on the method, the device, the ship and the storage medium for avoiding the installation of the host torsional vibration damper, the torsional vibration stress peak value of the intermediate shaft and the propeller shaft can not exceed the preset instantaneous allowable stress by adjusting the diameters of the intermediate shaft and the propeller shaft, the tensile strength of the intermediate shaft and the propeller shaft and the rotational inertia of the flywheel and the frequency modulation wheel, so that the installation of the torsional vibration damper can be avoided, the cost is greatly saved, and the installation is simpler.
The embodiments of the present application will be further explained with reference to the drawings.
Referring to fig. 1, fig. 1 is a schematic diagram of an operating device 100 for performing a method for avoiding installation of a torsional vibration damper of a host according to an embodiment of the present application. The computing device 100 of the present embodiment may include one or more control processors 110 and a memory 120, and fig. 1 illustrates one control processor 110 and one memory 120 as an example.
The control processor 110 and the memory 120 may be connected by a bus or other means, such as by a bus connection in fig. 1.
The memory 120, which is a non-transitory computer readable storage medium, may be used to store non-transitory software programs as well as non-transitory computer executable programs. Further, the memory 120 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory 120 optionally includes memory 120 located remotely from the control processor 110, and these remote memories may be connected to the computing device 100 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Those skilled in the art will appreciate that the device architecture illustrated in FIG. 1 is not intended to be limiting of the computing device 100, and may include more or less components than those illustrated, or some components may be combined, or a different arrangement of components.
In the computing device 100 shown in fig. 1, the control processor 110 may be configured to call up a computing program stored in the memory 120 to implement a method for avoiding installation of the host torsional vibration damper.
Based on the hardware structure of the computing device 100, various embodiments of the method for avoiding installation of the host torsional vibration damper of the present application are proposed.
Referring to fig. 2, an embodiment of the present application provides a method for avoiding installation of a host torsional vibration damper, which can be applied to the ship of fig. 3, the ship includes a host 310, an intermediate shaft 320, a bearing 330, a propeller shaft 340, a propeller 350, a flywheel 370 and a tuning wheel 360, the host 310 is in transmission connection with the intermediate shaft 320, the bearing 330, the propeller shaft 340 and the propeller 350, the flywheel 370 and the tuning wheel 360 are respectively installed at two ends of the host 310, and the method includes, but is not limited to, the following steps:
s210, acquiring the diameters of the middle shaft and the propeller shaft, the tensile strength of the middle shaft and the propeller shaft, and the rotational inertia of the flywheel and the frequency modulation wheel;
s220, acquiring torsional vibration stress peak values of the middle shaft and the propeller shaft under the condition that one cylinder of the main engine is on fire according to the diameter, the tensile strength and the rotational inertia;
and S230, if the torsional stress peak value exceeds the preset instantaneous allowable stress, adjusting the diameter and/or the tensile strength and/or the moment of inertia.
In one embodiment, the shaft materials of the middle shaft and the propeller shaft are made of carbon steel, a flywheel and a frequency modulation wheel with proper rotational inertia are selected and matched, the diameter of the shaft is adjusted, the one-cylinder fire condition of a main engine is met, shafting torsional vibration rotation calculation is carried out under the condition that a torsional vibration damper is not installed, and if the torsional vibration stress peak value of the shaft is smaller than the instantaneous allowable stress required by a classification society, the design is submitted to classification society for approval; when the shaft materials of the intermediate shaft and the propeller shaft are carbon steel and do not meet the requirements, the shaft materials are modified into alloy steel (the tensile strength is gradually improved to 800MPa or 900MPa), a flywheel and a frequency modulation wheel with proper rotational inertia and the diameter of the adjusting shaft are selected and matched to meet the fire condition of one cylinder of the main machine, and then shafting torsional vibration rotation calculation is carried out under the condition that a torsional vibration damper is not installed. If the shaft material is selected to be an alloy steel with a tensile strength of 900MPa which still exceeds the instantaneous allowable stress required by the classification society, a torsional vibration damper must be installed.
It should be noted that the intermediate shaft of the marine shafting adopts the alloy steel with high tensile strength to improve the torsional vibration allowable stress of the shaft, so that the installation of a torsional vibration damper on a five-cylinder main engine can be avoided. According to incomplete statistics, most of the cases that the torsional vibration damper must be configured if the intermediate shaft does not adopt a high tensile strength material are five-cylinder main engines, but due to different shaft diameters and lengths or arrangement of a shaft system, the fact that the torsional vibration damper is prevented from being configured by improving the tensile strength is considered by the six-cylinder main engines probably, and the final calculation of the classification society is taken as the standard.
This application can be through the diameter of continuous adjustment jackshaft and propeller shaft, the tensile strength of jackshaft and propeller shaft, the moment of inertia of flywheel and frequency modulation wheel for the torsional vibration stress peak value of jackshaft and propeller shaft is no longer than the instant stress of allowwing of predetermineeing, thereby can avoid installing the torsional vibration shock absorber, has saved the cost greatly, and the installation is simpler. In addition, the application is already applied to 35 39000DWT series handy bulk carriers MANB & W five-cylinder machine shafting, and the torsional vibration calculation meets the requirements of classification society. Each ship can save about 50 ten thousand yuan, and the total economic benefit is about 1720 ten thousand yuan.
Referring to fig. 4, an embodiment of the present application provides a method for avoiding installing a torsional vibration damper of a host, where step S220 in fig. 2 specifically includes, but is not limited to, the following steps:
s400, obtaining torsional vibration curves of the middle shaft and the propeller shaft under the condition that one cylinder of the main engine is on fire according to the diameter, the tensile strength and the rotational inertia, and obtaining a torsional vibration stress peak value from the torsional vibration curves.
Specifically, the diameters of the propeller shaft and the intermediate shaft, the tensile strengths of the propeller shaft and the intermediate shaft, and the rotational inertia of the frequency modulation wheel and the flywheel are adjusted in the following ways:
for adjusting the diameter of the propeller shaft and the intermediate shaft: in the design stage of a ship shafting, the diameter of an intermediate shaft is obtained according to the intermediate shaft, and the diameter of a propeller shaft is obtained according to the propeller shaft; inputting relevant parameters (the diameter and the weight of the shaft, the weight of a propeller, the position of a stern bearing and the like) of shaft arrangement into ship shaft torsional vibration calculation professional software, and respectively performing torsional vibration calculation on a transmission shaft under the conditions that each cylinder of a diesel engine is normally fired and one cylinder is fired to obtain torsional vibration curves of a middle shaft and the propeller shaft; under the condition that a certain cylinder is on fire, if the torsional stress peak values of the middle shaft and the propeller shaft in the torsional vibration curve exceed the instantaneous allowable stress required by the classification society, the shaft parameters modified each time are input into the calculation software to obtain different torsional vibration curves by a method of repeatedly adjusting the diameter of the shaft until the torsional stress peak values of the middle shaft and the propeller shaft in the output torsional vibration curve do not exceed the instantaneous allowable stress required by the classification society, and an optimal group of shaft diameters are selected.
For adjusting the tensile strength of the shaft material of the propeller shaft and the intermediate shaft: if the diameter of the shaft is changed to meet the requirement of classification society, the method of improving the tensile strength of the shaft material is adopted, such as changing the medium-strength carbon steel into high-strength alloy steel, and different tensile strengths are input into professional software for calculation until the peak value of the torsional stress of the middle shaft and the propeller shaft in the output torsional vibration curve does not exceed the instantaneous allowable stress required by classification society.
For matching the rotational inertia of the frequency modulation wheel and the flywheel: the ship propulsion main engine of each model is provided with a frequency modulation wheel with standard rotational inertia and a flywheel, wherein the frequency modulation wheel is arranged at the front end of the main engine, and the flywheel is arranged at the rear end of the main engine to ensure the running balance of a crankshaft. If the diameters of the intermediate shaft and the propeller shaft still exceed the instantaneous allowable stress by adjusting, frequency modulation wheels and flywheels with different rotational inertia are selected from a configuration table recommended by a host factory, and the different rotational inertia is input into professional software for calculation until the torsional stress peak values of the intermediate shaft and the propeller shaft in the output torsional vibration curve do not exceed the instantaneous allowable stress required by a classification society.
If the peak value of the torsional stress exceeds the instantaneous allowable stress specified by the classification society by a method of changing the diameter, or changing the tensile strength, or matching the rotational inertia of the flywheel and the FM wheel, or by the above three methods, the torsional vibration damper must be configured.
For the experimental data of the present application, details can be found in fig. 5-8.
In addition, the adjustment of the tensile strength comprises the following steps: the intermediate shaft and the propeller shaft are changed from carbon steel to alloy steel.
Referring to fig. 3, an embodiment of the present application provides a ship, which includes a main engine 310, an intermediate shaft 320, a bearing 330, a propeller shaft 340, a propeller 350, a flywheel 370, a tuning wheel 360 and a computing device as described above, wherein the main engine 310 is in transmission connection with the intermediate shaft 320, the bearing 330, the propeller shaft 340 and the propeller 350 in turn, and the flywheel 370 and the tuning wheel 360 are respectively installed at two ends of the main engine 310.
Since the air conditioner in this embodiment has the computing device 100 in any of the above embodiments, the ship in this embodiment has the hardware structure of the computing device 100 in the above embodiments, and the control processor 110 in the computing device 100 can call the computing program stored in the memory 120 to implement the method for avoiding installing the torsional vibration damper of the host 310.
The above-described embodiments of the apparatus are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, i.e. may be located in one place, or may also be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Furthermore, an embodiment of the present application also provides a computer-readable storage medium, which stores computer-executable instructions, which are executed by one or more control processors 110, for example, by one control processor 110 in fig. 1, and can cause the one or more control processors 110 to execute the fan control method of the air conditioner in the above-described method embodiment, for example, execute the above-described method steps S210, S220, and S230 in fig. 2, and the method step S400 in fig. 4.
One of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the embodiments, and various changes can be made without departing from the spirit of the present application within the knowledge of those skilled in the art.
Claims (6)
1. The utility model provides a method for avoid installing host computer torsional vibration damper, is applied to boats and ships, boats and ships include host computer, jackshaft, bearing, propeller shaft, screw, flywheel and frequency modulation wheel, the host computer is connected with jackshaft, bearing, propeller shaft and screw transmission in proper order, the flywheel with the frequency modulation wheel is installed respectively at the both ends of host computer, its characterized in that, the method includes:
acquiring the diameters of the intermediate shaft and the propeller shaft, the tensile strength of the intermediate shaft and the propeller shaft, and the rotational inertia of the flywheel and the frequency modulation wheel;
according to the diameter, the tensile strength and the rotational inertia, obtaining the torsional vibration stress peak value of the intermediate shaft and the propeller shaft under the condition that one cylinder of the main engine is in fire;
and if the peak value of the torsional stress exceeds the preset instantaneous allowable stress, adjusting the diameter and/or the tensile strength and/or the moment of inertia.
2. The method of avoiding installing a main unit torsional vibration damper of claim 1, wherein said obtaining peak torsional stress values of said intermediate shaft and said propeller shaft in case of a main unit one cylinder fire based on said diameter, said tensile strength and said moment of inertia comprises:
and obtaining a torsional vibration curve of the intermediate shaft and the propeller shaft under the condition that one cylinder of the main engine is in fire according to the diameter, the tensile strength and the rotational inertia, and obtaining a torsional vibration stress peak value from the torsional vibration curve.
3. The method of avoiding installing a mainframe torsional vibration damper of claim 1, wherein said adjusting of said tensile strength comprises the steps of:
the intermediate shaft and the propeller shaft are changed from carbon steel to alloy steel.
4. An arithmetic device comprising at least one control processor and a memory for communicative connection with the at least one control processor; the memory stores instructions executable by the at least one control processor to enable the at least one control processor to perform the method of avoiding installation of a host torsional vibration damper as claimed in any one of claims 1 to 3.
5. A ship is characterized by comprising a main machine, an intermediate shaft, a bearing, a propeller shaft, a propeller, a flywheel, a frequency modulation wheel and the arithmetic device according to claim 4, wherein the main machine is in transmission connection with the intermediate shaft, the bearing, the propeller shaft and the propeller in sequence, and the flywheel and the frequency modulation wheel are respectively arranged at two ends of the main machine.
6. A computer-readable storage medium having stored thereon computer-executable instructions for causing a computer to perform the method of avoiding installation of a host torsional vibration damper as claimed in any one of claims 1 to 3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010063181.8A CN111284646A (en) | 2020-01-20 | 2020-01-20 | Method and device for avoiding installation of host torsional vibration damper, ship and storage medium |
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| CN202010063181.8A CN111284646A (en) | 2020-01-20 | 2020-01-20 | Method and device for avoiding installation of host torsional vibration damper, ship and storage medium |
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Application publication date: 20200616 |