CN113401314A - Simulation device for misalignment fault of propulsion shaft system and misalignment adjusting method - Google Patents
Simulation device for misalignment fault of propulsion shaft system and misalignment adjusting method Download PDFInfo
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Abstract
本发明公开一种推进轴系不对中故障模拟装置，包括：推进轴系模拟模组用于模拟船舶、潜艇中提供推力的旋转机，不对中调整模组对推进轴系模拟模组的对中状态进行调整，实现平行不对中、角度不对中和综合不对中等三种不对中故障的模拟，振动数据采集模组用于捕捉推进轴系模拟模组振动数据，自适应振动控制模组根据振动数据控制推进轴系模拟模组进行相应运动的同时，并利用负反馈机制控制不对中调整模组找到振动量最小的对中状态。本发明采用不对中调整模组，结构紧凑，可模拟多类不对中故障，有效提高推进轴系故障模拟的准确性和高效性，为推进轴系振动测试与故障诊断和抑振方面的研究提供基础。
The invention discloses a propulsion shafting misalignment fault simulation device, comprising: a propulsion shafting simulation module for simulating a rotating machine that provides thrust in ships and submarines, and a misalignment adjustment module for centering the propulsion shafting simulation module The state is adjusted to realize the simulation of three types of misalignment faults: parallel misalignment, angular misalignment and comprehensive misalignment. The vibration data acquisition module is used to capture the vibration data of the propulsion shaft system simulation module, and the adaptive vibration control module is based on the vibration data. While controlling the propulsion shaft system simulation module to move accordingly, the negative feedback mechanism is used to control the misalignment adjustment module to find the centering state with the smallest vibration. The invention adopts a misalignment adjustment module, has a compact structure, can simulate multiple types of misalignment faults, effectively improves the accuracy and efficiency of the propulsion shafting fault simulation, and provides research on the vibration testing and fault diagnosis of the propulsion shafting and vibration suppression. Base.
Description
Technical Field
The invention relates to the technical field of shaft misalignment simulation devices, in particular to a simulation device for a misalignment fault of a propulsion shaft system and a misalignment adjusting method.
Background
With the continuous promotion of comprehensive national power, the continuous expansion of external openness and the deep implementation of ocean national strategy, ships play more and more important roles as marine traffic logistics equipment. The propulsion shaft system is used as a main power device of a ship, and plays a role in the marine transportation industry in a more and more non-negligible way due to stable output and high efficiency, the failure frequency of the propulsion shaft system is caused and the service time of the device is greatly reduced due to the complex marine environment and variable ship operation conditions, and 70% of the rotary mechanical failures are caused by misalignment or are related to the misalignment. When the rotor with the misalignment fault moves, equipment vibration and shaft deflection deformation are caused, so that the collision and friction between a shaft system and a frame and the abrasion of a bearing cause great threat to the equipment performance and the personnel safety. Therefore, designing a simulation device for misalignment fault of a propulsion shaft system and researching the misalignment fault mechanism and the vibration characteristics of the misalignment fault mechanism are important in learning and scientific research in the field of current rotating machinery.
At present, aiming at the misalignment simulation of a propulsion shaft system, the simulation of comprehensive misalignment faults is realized by mainly adopting a method of manually disassembling a bearing seat and filling a feeler gauge or a gasket, but the simulation and the recurrence of two faults of parallel misalignment and misalignment of an angle of the propulsion shaft system cannot be realized. In addition, the method for filling the feeler gauge or the gasket has the defects of low precision, low efficiency, inaccurate quantification of the misalignment degree and the like. The part of the simulation rack also has the problems that the horizontal direction movement of the motor side is realized through adjusting screws so as to simulate parallel misalignment, but the simulation fault is single, the accuracy is poor and the like. Therefore, a simple and effective propulsion shafting misalignment fault simulation device with strong fault recurrence capacity needs to be developed.
Disclosure of Invention
In view of the above, it is necessary to provide a simulation apparatus for misalignment of a propulsion shaft system and a misalignment adjustment method, so as to solve the technical problems of single simulation fault and poor accuracy of the simulation apparatus.
To solve the above problem, according to an aspect of the present invention, there is provided a device for simulating a misalignment fault of a propulsion shaft system, comprising:
the propulsion shafting simulation module is used for simulating a rotating machine for providing thrust in ships and submarines;
the misalignment adjusting module is used for adjusting the centering state of the propulsion shafting simulation module and realizing the simulation of three misalignment faults of parallel misalignment, angle misalignment and comprehensive misalignment;
the vibration data acquisition module comprises a vibration high-speed camera component and an acceleration data acquisition component, wherein the vibration high-speed camera component captures the vibration data of the propulsion shafting simulation module in a non-contact manner, and the acceleration data acquisition component captures the vibration data of the propulsion shafting simulation module in a contact manner;
and the self-adaptive vibration control module is used for processing and analyzing the vibration data, controlling the propulsion shafting simulation module to perform corresponding motion according to the processed vibration data, and controlling the misalignment adjusting module to find the centering state with the minimum vibration quantity by utilizing a negative feedback mechanism.
According to some embodiments, still include the base, propulsion shafting simulation module is including the first servo motor, reduction gear, two sets of propulsion axle subassembly, bearing frame and the propeller that connect gradually, first servo motor with the equal fixed mounting of reduction gear in on the base, two sets of propulsion axle subassemblies pass through the bearing frame install in on the base, two sets of propulsion axle subassemblies of first servo motor drive coaxial coupling rotate in order to drive the propeller rotates, the reduction gear is used for reducing the rotational speed of propulsion axle subassembly.
According to some embodiments, the propulsion shaft assembly comprises a shaft coupling, a rotating shaft and a first bearing, two ends of the rotating shaft are respectively connected with the shaft coupling, the first bearing is fixedly installed on the rotating shaft, the bearing seat is used for fixing the first bearing of the propulsion shaft assembly, and the two groups of propulsion shaft assemblies are connected through the shaft coupling.
According to some embodiments, the misalignment adjusting modules are provided with two groups, and the two groups are respectively positioned on one side of the first bearing of the propulsion shaft assembly of the other group and fixedly connected with the first bearing, so that the simulation of three misalignment faults of parallel misalignment, angle misalignment and comprehensive misalignment can be realized.
According to some embodiments, the misalignment adjusting module comprises a second servo motor, a belt transmission assembly, a horizontal movement assembly and a bearing seat mounting plate, wherein the second servo motor and the horizontal movement assembly are both fixedly mounted on the base, the second servo motor and the horizontal movement assembly are connected through the belt transmission assembly, and a first bearing of the other group of propulsion shaft assemblies is fixedly mounted at the top of the horizontal movement assembly through the bearing seat mounting plate, so that the second servo motor drives the horizontal movement assembly to move horizontally through the belt transmission assembly and drives the bearing seat mounting plate to move in the horizontal direction, and therefore the axis of the propulsion shaft system simulation module is deviated, and misalignment faults are simulated.
According to some embodiments, the horizontal movement assembly comprises a screw rod, a threaded block, a second bearing and a guide rail, the central axis of the second bearing and the extending direction of the guide rail are parallel to the rotating shaft, the second bearing and the guide rail are fixedly mounted on the base, the bearing seat mounting plate is fixedly mounted at the top of the threaded block, one side of the threaded block is in threaded connection with the screw rod, the other side of the threaded block is in sliding connection with the guide rail, one end of the screw rod is connected with the belt transmission assembly, the other end of the screw rod is connected with the second bearing, and the screw rod rotates to drive the threaded block to move along the length direction of the guide rail.
According to some embodiments, the belt transmission assembly comprises two belt pulleys and a belt with different radiuses, the belt pulleys and the belt are in arc tooth shapes, the belt pulley with the large radius is fixedly installed at the output end of the second servo motor, and the belt pulley with the small radius is fixedly installed at one end, away from the second bearing, of the screw rod so as to reduce the rotating speed of the screw rod.
According to some embodiments, the vibrating high-speed camera assembly comprises three high-speed cameras for collecting vibration signals in a non-contact manner;
the acceleration data acquisition assembly comprises two three-phase acceleration sensors, is fixedly arranged on the bearing seat mounting plate and acquires vibration signals in a contact mode.
According to some embodiments, the adaptive vibration control module comprises an upper computer and a human-computer interaction interface which are connected, wherein the human-computer interaction interface is used for displaying numerical values and diagrams, and can instruct the upper computer to work;
the input end of the upper computer is connected with the vibration data acquisition module, the output end of the upper computer is respectively connected with the misalignment adjusting module and the propulsion shafting simulation module, and the upper computer controls the servo motor to perform corresponding motion and simultaneously utilizes a negative feedback mechanism to control the misalignment adjusting module to find the alignment state with the minimum vibration quantity.
The invention also provides a propulsion shafting misalignment adjusting method of the propulsion shafting misalignment fault simulation device, and the misalignment adjusting method corresponding to any scheme comprises the following steps:
the parallel misalignment simulation mode is that the two misalignment adjusting modules move to the same direction for the same distance;
the simulation mode of the angle misalignment is that the first misalignment adjusting module does not move, and the second misalignment adjusting module moves for a certain distance;
the simulation mode of synthesizing the misalignment is that the two misalignment adjusting modules move towards the same direction, and the moving distance of the second misalignment adjusting module is larger than that of the first misalignment adjusting module.
Compared with the prior art, the invention has the following beneficial effects:
the propulsion shafting simulation module of the propulsion shafting misalignment fault simulation device is used for simulating a rotary machine for providing thrust in ships and submarines, the misalignment adjustment module adjusts the centering state of the propulsion shafting simulation module, the simulation of three misalignment faults of parallel misalignment, angle misalignment and comprehensive misalignment is realized, the vibration data acquisition module is used for capturing the vibration data of the propulsion shafting simulation module, and the self-adaptive vibration control module controls the propulsion shafting simulation module to perform corresponding movement according to the vibration data and controls the misalignment adjustment module to find the centering state with the minimum vibration quantity by using a negative feedback mechanism. The invention adopts the misalignment adjusting module, has compact structure, can simulate various misalignment faults, effectively improves the accuracy and the efficiency of the fault simulation of the propulsion shaft system, and provides a foundation for the vibration test, the fault diagnosis and the vibration suppression of the propulsion shaft system.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a simulation apparatus for a misalignment fault of a propulsion shaft system according to the present invention;
FIG. 2 is a schematic structural diagram of a vibration data acquisition module of a simulation apparatus for simulating misalignment of a propulsion shaft system according to the present invention;
FIG. 3 is a schematic diagram of an adaptive vibration control module of a simulation apparatus for a thrust shafting misalignment fault provided in the present invention;
FIG. 4 is a schematic structural diagram of an misalignment adjusting module of the simulation apparatus for misalignment of the propulsion shaft system according to the present invention;
FIG. 5 is a schematic structural diagram of a belt transmission assembly of a simulation device for misalignment of a propulsion shaft system according to the present invention;
fig. 6 is a schematic diagram of three misalignment states, namely normal alignment and neutral alignment, of the simulation device for misalignment faults of the propulsion shaft system provided by the invention.
In the figure: a propulsion shaft simulation module 100; a first servo motor 110; a decelerator 120; a propeller shaft assembly 130; a coupling 131; a rotating shaft 132; a first bearing 133; a bearing housing 140; a propeller 150; the misalignment adjustment module 200; a second servo motor 210; a horizontal movement assembly 220; a screw rod 221; a threaded block 222; a second bearing 223; a guide rail 224; a belt drive assembly 230; a pulley 231; a belt 232; a bearing housing mounting plate 240; a vibration data acquisition module 300; a vibrating high-speed camera assembly 310; a high-speed camera 311; an acceleration data acquisition component 320; a three-phase acceleration sensor 321; an adaptive vibration control module 400; an upper computer 410; a human-machine interaction interface 420; a base 500.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The invention provides a simulation device for misalignment fault of a propulsion shaft system, please refer to fig. 1 to 5, which comprises a propulsion shaft system simulation module 100, a misalignment adjustment module 200, a vibration data acquisition module 300 and an adaptive vibration control module 400, wherein the misalignment adjustment module 200 is connected with the propulsion shaft system simulation module 100 to adjust the centering state of the propulsion shaft system simulation module 100 to realize the simulation of three misalignment faults of parallel misalignment, angular misalignment and comprehensive misalignment, the vibration data acquisition module 300 is used for capturing the vibration data of the propulsion shaft system simulation module 100, the adaptive vibration control module 400 is used for processing and analyzing the vibration data, and controlling the propulsion shaft system simulation module 100 to correspondingly move according to the processed vibration data, and simultaneously controlling the misalignment adjustment module 200 to find the centering state with the minimum vibration quantity by using a negative feedback mechanism, the fault simulation device can simulate various faults and adjust various different faults simulated by the fault simulation device to a state with higher accuracy.
The propulsion shafting simulation module 100 is used for simulating a rotary machine for providing thrust in a ship or a submarine. The barrier simulation apparatus further includes a base 500.
The propulsion shafting simulation module 100 includes a first servo motor 110, a speed reducer 120, two sets of propulsion shaft assemblies 130, a bearing pedestal 140 and a propeller 150, which are connected in sequence, wherein the first servo motor 110 and the speed reducer 120 are respectively and fixedly mounted on the base 500 through a motor support and a speed reducer 120 support, and the speed reducer 120 is a planetary gear speed reducer 120 and is used for reducing the rotating speed of the propulsion shaft assemblies 130. The two groups of propeller shaft assemblies 130 are fixedly mounted on the base 500 through the bearing seat 140, the first servo motor 110 drives the two groups of propeller shaft assemblies 130 which are coaxially connected to rotate so as to drive the propeller 150 to rotate,
the propulsion shaft assembly 130 includes a coupler 131, a rotating shaft 132 and a first bearing 133, two ends of the rotating shaft 132 are respectively connected to the coupler 131, the first bearing 133 is fixedly mounted on the rotating shaft 132, the bearing seat 140 is used for fixing the first bearing 133 of one group of the propulsion shaft assembly 130, the two groups of the propulsion shaft assemblies 130 are connected through the coupler 131, and the coupler 131 is an elastic coupler.
The misalignment adjusting module 200 is used for adjusting the alignment state of the propulsion shafting simulation module 100, and two sets of misalignment adjusting modules 200 are respectively positioned on one side of the first bearing 133 of the other set of propulsion shaft assembly 130 and fixedly connected to realize the simulation of three misalignment faults of parallel misalignment, angle misalignment and comprehensive misalignment.
The misalignment adjusting module 200 includes a second servo motor 210, a belt transmission assembly 230, a horizontal movement assembly 220 and a bearing seat mounting plate 240, the second servo motor 210 and the horizontal movement assembly 220 are both fixedly mounted on the base 500, the second servo motor 210 and the horizontal movement assembly 220 are connected through the belt transmission assembly 230, a first bearing 133 of another group of propulsion shaft assemblies 130 is fixedly mounted on the top of the horizontal movement assembly 220 through the bearing seat mounting plate 240, so that the second servo motor 210 drives the horizontal movement assembly 220 to move horizontally through the belt transmission assembly 230, and drives the bearing seat mounting plate 240 to move in the horizontal direction, so as to realize the deviation of the axis of the propulsion shafting simulation module 100 and further simulate misalignment faults. Wherein the servo motor can be fixedly connected with the base 500 through an F-shaped fixing plate.
As shown in fig. 4, the horizontal moving assembly 220 includes a screw rod 221, a screw block 222, a second bearing 223 and a guide rail 224, the central axis of the second bearing 223 and the extension direction of the guide rail 224 are both parallel to the rotating shaft 132, the second bearing 223 and the guide rail 224 are fixedly mounted on the base 500, the bearing seat mounting plate 240 is fixedly mounted on the top of the screw block 222, one side of the screw block 222 is in threaded connection with the screw rod 221, the other side is in sliding connection with the guide rail 224, one end of the screw rod 221 is connected with the belt transmission assembly 230, the other end is connected with the second bearing 223, and the screw rod 221 rotates to drive the screw block 222 to move along the length direction of the guide rail 224.
In addition, as shown in fig. 5, the belt driving assembly 230 includes two pulleys 231 and a belt 232 with different radii, and the pulleys 231 and the belt 232 adopt arc tooth shapes, so that slipping can be effectively avoided. The pulley 231 with a large radius is fixedly installed at the output end of the second servo motor 210, and the pulley 231 with a small radius is fixedly installed at one end of the screw rod 221 away from the second bearing 223, so as to reduce the rotation speed of the screw rod 221.
In this embodiment, the misalignment adjusting module 200 is powered by the second servo motor 210, and since the misalignment fault generally has an offset distance of millimeter, the circular-arc toothed belt transmission assembly 230 is adopted to perform speed reduction and precise transmission, so that the belt pulley 231 with a large radius drives the threaded block 222 on the lead screw 221 to move in the horizontal direction, and drives the bearing seat mounting plate 240 to move in the horizontal direction, thereby simulating the misalignment fault.
As shown in fig. 6, in the embodiment, the misalignment adjusting module 200 is disposed at two first bearings 133, and corresponding misalignment adjusting amounts are set, so as to realize the simulation of three misalignment faults, i.e., parallel misalignment, angular misalignment and comprehensive misalignment. As shown in fig. 6(a), the axes of the rotating shafts 132 at the two ends of the coupling 131 are collinear and in a normal state; as shown in fig. 6(b), the axes of the rotating shafts 132 at the two ends of the coupling 131 are parallel and have a distance b, and belong to parallel misalignment; as shown in fig. 6(c), the included angle of the axes of the rotating shafts 132 at the two ends of the coupling 131 is α, which is an angular misalignment; as shown in fig. 6(d), the axial distance e between the rotating shafts 132 at the two ends of the coupling 131 includes an included angle β, which is comprehensive misalignment.
The vibration data acquisition module 300 comprises a vibration high-speed camera component 310 and an acceleration data acquisition component 320, the vibration high-speed camera component 310 captures vibration data of the propulsion shafting simulation module 100 in a non-contact manner, and the acceleration data acquisition component 320 captures the vibration data of the propulsion shafting simulation module 100 in a contact manner.
As shown in fig. 2, the vibration high-speed camera assembly 310 includes three high-speed cameras 311 arranged around the rotating shaft 132 at radial angles of 0 °, 90 ° and 135 °, and collects vibration signals by a non-contact method. The acceleration data acquisition assembly 320 comprises an acceleration sensor and an adsorption magnetic seat, wherein the acceleration sensor can acquire vibration acceleration signals in x, y and z directions, and the acceleration sensor is fixed on the bearing seat 140 through the adsorption magnetic seat.
The vibration high-speed camera component 310 is used for measuring the vibration of the normal shaft section; and the acceleration data acquisition component 320 is adopted for the shaft section which simulates the misalignment fault, and the shaft section is not suitable for measuring methods such as a high-speed camera module or an eddy current sensor because the shaft section moves in the horizontal direction.
The adaptive vibration control module 400 is configured to process and analyze vibration data, and control the propulsion shafting simulation module 100 to perform corresponding motions according to the processed vibration data, and at the same time, control the misalignment adjustment module 200 to find a centering state with a minimum vibration amount by using a negative feedback mechanism.
As shown in fig. 3, the adaptive vibration control module 400 includes an upper computer 410 and a human-machine interface 420 (a communication medium or means between human and computer systems, which is a platform for performing bidirectional information exchange between human and computer systems for various symbols and actions), where the human-machine interface 420 is used to display numerical values and diagrams, and the human-machine interface 420 can instruct the upper computer 410 to operate. The input end of the upper computer 410 is connected with the vibration data acquisition module 300, the output end of the upper computer 410 is respectively connected with the misalignment adjusting module 200 and the propulsion shafting simulation module 100, and the upper computer 410 controls the servo motor to perform corresponding movement and simultaneously controls the misalignment adjusting module 200 to find the centering state with the minimum vibration quantity in real time by utilizing a negative feedback mechanism.
The multi-sensor fusion method based on the vibration high-speed camera component 310 and the acceleration data acquisition component 320 acquires vibration data of the system in real time, and the upper computer 410 is used for analyzing and processing vibration conditions of the system to reveal a mapping relation between misalignment faults of the propulsion shafting and dynamic performance of the system, so that a foundation is laid for research in the aspects of fault diagnosis and performance optimization of the propulsion shafting.
The user inputs the misalignment fault and the fault degree to be simulated on the human-computer interaction interface 420, and the upper computer 410 controls the servo motor to perform corresponding movement after receiving the instruction. Meanwhile, the vibration data acquisition module 300 acquires vibration data synchronously, and displays the processed result on the human-computer interaction interface 420 in the form of a numerical value and a chart. Except that the device simulates the misalignment fault and carries out vibration test, the module can realize the self-adaptive vibration control function. When the device is disassembled or the structure is changed, the centering state with the minimum vibration quantity is found by utilizing a negative feedback mechanism through controlling the non-centering adjusting module 200 in real time and monitoring the vibration state.
In the above scheme, the propulsion shafting simulation module 100 is used for simulating a rotating machine for providing thrust in a ship or a submarine, the misalignment adjustment module 200 adjusts the centering state of the propulsion shafting simulation module 100 to realize the simulation of three misalignment faults of parallel misalignment, angle misalignment, and comprehensive misalignment, the vibration data acquisition module 300 is used for capturing the vibration data of the propulsion shafting simulation module 100, and the adaptive vibration control module 400 controls the propulsion shafting simulation module 100 to perform corresponding motion according to the vibration data and controls the misalignment adjustment module 200 to find the centering state with the minimum vibration quantity by using a negative feedback mechanism. The invention adopts the misalignment adjusting module 200, has compact structure, can simulate various misalignment faults, effectively improves the accuracy and the efficiency of the fault simulation of the propulsion shaft system, and provides a foundation for the vibration test, the fault diagnosis and the vibration suppression of the propulsion shaft system.
Example 2
The embodiment of the invention also provides a device for simulating the misalignment fault of the propulsion shaft system, and provides a method for adjusting multiple types of misalignment faults of the propulsion shaft system, as shown in fig. 6, by arranging the misalignment adjusting module 200 at two bearing positions and setting corresponding misalignment adjusting amounts, the simulation of three types of misalignment faults, namely parallel misalignment, angle misalignment and comprehensive misalignment, is realized, and the adjusting method comprises the following steps:
as shown in fig. 6(a), the axes of the rotating shafts 132 at both ends of the coupling 131 are collinear, and the normal state is achieved.
As shown in fig. 6(b), the axes of the rotating shafts 132 at the two ends of the coupling 131 are parallel and have a distance b, which belongs to parallel misalignment, and the adjustment method is that the two misalignment adjustment modules 200 move in the same direction for the same distance.
As shown in fig. 6(c), the included angle between the axes of the rotating shafts 132 at the two ends of the coupling 131 is α, which belongs to the angular misalignment, and the adjustment method is that the first misalignment adjusting module 200 does not move, and the second misalignment adjusting module 200 moves a certain distance.
As shown in fig. 6(d), the axial distance between the rotating shafts 132 at the two ends of the coupling 131 is e, the included angle is β, and the method belongs to comprehensive misalignment, and the adjustment method is that the two misalignment adjusting modules 200 move in the same direction, and the moving distance of the second misalignment adjusting module 200 is greater than that of the first misalignment adjusting module 200.
The adaptive vibration control module 400 controls the misalignment adjustment module 200 to continuously operate, and processes the vibration signal in real time. If the vibration amount at the moment is less than the vibration amount at the previous moment, controlling the misalignment adjusting module 200 to continuously keep the existing movement direction to continuously adjust; if the vibration amount is larger than the previous time, the centering adjustment module 200 is controlled not to adjust in the reverse direction of the existing movement direction.
The control strategy of the adaptive vibration control module 400 for controlling the misalignment adjusting module 200 is a control variable method, that is, the misalignment adjusting module 200 close to the coupler 131 is adjusted first, the adjusting module is kept still after the state with the minimum vibration is found, and then another misalignment adjusting module 200 is adjusted. And stopping the movement of the other misalignment adjusting module 200 until the other misalignment adjusting module finds the state with the minimum vibration, so that the best alignment state can be obtained.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
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2021
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204214627U (en) * | 2014-11-26 | 2015-03-18 | 武汉理工大学 | Marine propulsion shafting whirling vibration test unit |
| CN104596714A (en) * | 2015-01-22 | 2015-05-06 | 武汉理工大学 | Ship propulsion shafting whirling vibration and twisting vibration simulation experiment device |
| CN106347578A (en) * | 2016-10-27 | 2017-01-25 | 江苏科技大学 | Method for monitoring marine propulsion shafting bearing vibration failure |
| CN106996871A (en) * | 2017-04-07 | 2017-08-01 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | Real yardstick marine propulsion shafting vibration transmissibility experimental rig |
| CN112697367A (en) * | 2020-12-23 | 2021-04-23 | 武汉理工大学 | Boats and ships propulsion shafting longitudinal and transverse coupling vibration experiment platform |
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