Marine mechanical equipment vibration isolation system and method based on active regulation and control of installation state

Abstract

The ship mechanical equipment vibration isolation system comprises a middle raft body, an upper-layer vibration isolator, a lower-layer vibration isolator and an executing mechanism, equipment is installed on the top of the middle raft body through the upper-layer vibration isolator, the middle raft body is installed on a ship body base through the lower-layer vibration isolator, and the executing mechanism is installed on the ship body base through the lower-layer vibration isolator. The executing mechanism is divided into an equipment executing mechanism and a buoyant raft executing mechanism, the equipment executing mechanism corresponds to the bottom of the equipment and is arranged at the top of the middle raft body, and the buoyant raft executing mechanism corresponds to the bottom of the middle raft body and is arranged on the ship body base. And efficient vibration isolation and acoustic camouflage are realized through active regulation and control of an installation state without the help of a transducer and a vibration exciter.

Description

Technical Field

[0001] This invention relates to the technical field of vibration reduction and isolation device design, and specifically to a vibration isolation system and method for marine machinery equipment based on active adjustment of installation status. Background Technology

[0002] When a ship is sailing at low speeds, the radiated noise from mechanical equipment accounts for approximately 90%. Large equipment such as marine diesel engines, propulsion motors, and gas turbines, which are heavy and vibrate significantly, weighing tens or even hundreds of tons, are the primary noise sources during low-speed ship operation. Vibration control of mechanical equipment is crucial for controlling radiated noise during low-speed ship operation.

[0003] Currently, marine machinery and equipment mainly utilize the mass effect to achieve vibration attenuation through the interaction of equipment, upper-level vibration isolators, intermediate mass, and lower-level vibration isolators. Vibration isolation designs such as floating rafts require consuming about half of the weight resources of the machinery and equipment. For large machinery and equipment such as diesel engines, propulsion motors, and gas turbines, the cost of vibration isolation resources is relatively high. Moreover, large machinery and equipment are often partially operational, with non-operating equipment in an idle state, resulting in insufficient utilization of equipment weight resources.

[0004] In addition, ships currently achieve acoustic camouflage through underwater acoustic transducers and exciters, which takes up a lot of extra space and weight, and the vibration energy of the mechanical equipment itself is not utilized. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a vibration isolation system and method for ship machinery and equipment based on active adjustment of installation state, which achieves efficient vibration control and ship acoustic camouflage by actively adjusting the rigid and elastic installation states through the actuator.

[0006] The embodiments of this application are implemented as follows: This application provides a vibration isolation system for marine machinery based on active adjustment of installation status. The system comprises an intermediate raft, an upper vibration isolator, a lower vibration isolator, and an actuator. The equipment is mounted on top of the intermediate raft via the upper vibration isolator, and the intermediate raft is mounted on the hull base via the lower vibration isolator. The actuator is divided into an equipment actuator and a floating raft actuator. The equipment actuator is mounted on top of the intermediate raft corresponding to the bottom of the equipment, and the floating raft actuator is mounted on the hull base corresponding to the bottom of the intermediate raft.

[0007] In some alternative implementations, the actuator is an electromagnetic actuator, a hydraulic actuator, or a pneumatic actuator.

[0008] In some alternative implementations, the upper and lower vibration isolators are rubber vibration isolators, polyurethane vibration isolators, or airbag vibration isolators.

[0009] In some alternative implementations, each of the devices is provided with at least four of the device actuators, located at the four corners of the device.

[0010] In some alternative implementations, each of the aforementioned rafts is provided with at least four of the aforementioned raft actuators, located at the four corners of the raft.

[0011] The method for using a vibration isolation system for marine machinery based on active adjustment of installation status is characterized by the following: When further vibration isolation is required, the floating raft actuator is in a disengaged state and does not transmit vibration. The equipment actuator adjusts its support or disengagement state according to whether the equipment is running. When acoustic camouflage is required, the floating raft actuator is in a supported state and transmits vibration. The equipment actuator adjusts its support or disengagement state according to whether the equipment is running.

[0012] In some alternative implementations, when further improvement in vibration isolation is required, the adjustment principles of the device actuator are as follows: The equipment actuator is in a separated state for the equipment that is running on the floating raft and does not transmit vibration; for the equipment that is not running on the floating raft, the equipment actuator is in a supporting state, and the equipment that is not running forms an effective intermediate mass of the floating raft, which further improves the vibration isolation effect of the floating raft on the basis of the existing vibration isolation effect.

[0013] In some alternative implementations, when acoustic camouflage functionality is required, the adjustment principles of the device actuator are as follows: For operating equipment, the actuators are in a supported state, transmitting vibration; for non-operating equipment, the actuators are in a disengaged state, not transmitting vibration, nor increasing the effective intermediate mass of the raft. At this time, the ship's radiated noise is at its maximum, achieving acoustic camouflage and preventing the ship's accurate acoustic information from being obtained.

[0014] In some alternative implementations, when multiple pump sets are arranged on the floating raft, the actuators of the randomly selected operating pump sets are in a supported state, causing the vessel to exhibit different acoustic characteristics.

[0015] The beneficial effects of this application are as follows: This application provides a vibration isolation system and method for ship machinery based on active adjustment of installation state. By actively adjusting the rigid and elastic installation states, non-operating equipment is rigidly connected to the floating raft and converted into part of the middle raft body of the floating raft. This can multiply the effective mass of the vibration isolation system and further improve the vibration isolation effect of the system. By utilizing the vibration energy of the mechanical equipment itself and achieving "acoustic short circuit" through active adjustment of rigid and elastic installation states, the vibration energy of the operating equipment is directly transferred to the hull structure, which greatly increases the level and spectral characteristics of the ship's radiated noise. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the installation of the vibration isolation system for marine machinery and equipment according to an embodiment of this application; Figure 2a This is a schematic diagram of the actuator support state according to an embodiment of this application; Figure 2b This is a schematic diagram of the actuator in a separated state according to an embodiment of this application; Figure 3 This is a schematic diagram of a hydraulic actuator according to an embodiment of this application. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] The features and performance of this application will be further described in detail below with reference to the embodiments.

[0022] like Figure 1As shown, the present invention provides a vibration isolation system for ship machinery based on active adjustment of installation status, including an intermediate raft 1, an upper vibration isolator 2, a lower vibration isolator 3, and an actuator 4. The equipment is installed on the top of the intermediate raft through the upper vibration isolator, and the intermediate raft is installed on the hull base through the lower vibration isolator. The actuator is divided into an equipment actuator 41 and a floating raft actuator 42. The equipment actuator is installed on the top of the intermediate raft corresponding to the bottom of the equipment, and the floating raft actuator is installed on the hull base corresponding to the bottom of the intermediate raft.

[0023] Traditional floating rafts utilize the mass effect to achieve vibration attenuation through the interaction of the equipment, upper-level vibration isolators, intermediate raft body, and lower-level vibration isolators. This method, based on the traditional floating raft, further incorporates an actuator. This actuator, by adjusting the position of its actuating end face, achieves the transformation between separation and support states (see...). Figure 2a , Figure 2b The actuator does not transmit vibration in the isolated state, and the equipment is flexibly installed. In the supported state, the actuator transmits vibration, and the equipment is rigidly installed. In the supported state, the actuator height should not be too large to avoid damaging the vibration isolator; it is recommended that the vibration isolator height in the supported state be approximately the same as its free-state height. Based on usage requirements, the installation state can be actively controlled via the actuator, allowing the raft to switch between vibration isolation and acoustic camouflage states.

[0024] Furthermore, the upper and lower vibration isolators are made of rubber, polyurethane, or airbags. The actuators are electromagnetic, hydraulic, or pneumatic actuators.

[0025] For each piece of vibration-isolated equipment, it is recommended to install at least four actuators, preferably at the four corners of the equipment, to prevent instability in the equipment support. Where space permits, it is advisable to have as many actuators as possible, as this not only increases the stiffness of the support system and improves the effective mass of the vibration isolation system, but also enhances the transmission of vibration energy and improves the acoustic camouflage effect.

[0026] It is recommended that each raft be equipped with at least four actuators, preferably located at the four corners of the raft to prevent instability. The number of actuators can be increased as much as space allows to enhance vibration energy transfer and improve acoustic camouflage.

[0027] Example 1 Taking a hydraulic actuator as an example, such as Figure 3As shown, the hydraulic actuator includes a cylinder 43, a piston rod 44, and a piston 45. The cylinder sidewalls are symmetrically equipped with hydraulic oil ports 46. The internal cavity of the cylinder is divided into a rod-type cavity 47 and a rodless cavity 48 by the piston. A seal 49 is provided along the piston edge. The top of the piston rod has an actuating end face 50, which contacts the equipment or intermediate raft. Due to the different hydraulic oil volumes in the two cavities, the piston slides up and down along the inner wall of the cylinder, driving the actuating end face to move up and down, thus achieving the switching between the support and disengagement states of the actuator.

[0028] The above-mentioned vibration isolation system for marine machinery and equipment based on active adjustment of installation status includes the following aspects when in use: When further enhancement of vibration isolation is needed, the floating raft actuators are in a disengaged state, not transmitting vibration. For equipment operating on the floating raft, the equipment actuators are in a disengaged state, not transmitting vibration; for equipment not operating on the floating raft, the equipment actuators are in a supporting state, and the non-operating equipment forms an effective intermediate mass for the floating raft, further improving the vibration isolation effect based on the existing vibration isolation effect. When large main equipment such as diesel engines, propulsion motors, and gas turbines are arranged on the floating raft, the effective mass of the vibration isolation system can be increased several times, and the improvement in vibration isolation effect is even more significant.

[0029] When acoustic camouflage is required, the floating raft actuators around the raft isolator are in a supported state, transmitting vibration. The actuators of operating equipment are also in a supported state, transmitting vibration. The actuators of non-operating equipment are in a disengaged state, transmitting no vibration and not increasing the effective intermediate mass of the floating raft. At this time, the ship's radiated noise is at its maximum, achieving acoustic camouflage and preventing sonar and other systems from obtaining accurate acoustic information about the ship.

[0030] When multiple pump sets are arranged on the floating raft, the actuators of the operating pump sets can be randomly selected to be in a supported state, so that the ship exhibits different acoustic characteristics.

Claims

1. A vibration isolation system for marine machinery and equipment based on active adjustment of installation status, characterized in that, The system includes an intermediate raft, an upper vibration isolator, a lower vibration isolator, and an actuator. The equipment is mounted on top of the intermediate raft via the upper vibration isolator, and the intermediate raft is mounted on the hull base via the lower vibration isolator. The actuator is divided into an equipment actuator and a floating raft actuator. The equipment actuator is mounted on top of the intermediate raft corresponding to the bottom of the equipment, and the floating raft actuator is mounted on the hull base corresponding to the bottom of the intermediate raft.

2. The vibration isolation system for marine machinery and equipment based on active adjustment of installation status as described in claim 1, characterized in that, The actuator is an electromagnetic actuator, a hydraulic actuator, or a pneumatic actuator.

3. The vibration isolation system for marine machinery and equipment based on active adjustment of installation status as described in claim 1 or 2, characterized in that, The upper and lower vibration isolators are made of rubber, polyurethane, or airbags.

4. The vibration isolation system for marine machinery and equipment based on active adjustment of installation status as described in claim 1, characterized in that, Each of the aforementioned devices shall be equipped with at least four of the aforementioned device actuators, located at the four corners of the device.

5. The vibration isolation system for marine machinery and equipment based on active adjustment of installation status as described in claim 1, characterized in that, Each of the aforementioned rafts shall be equipped with at least four of the aforementioned raft actuators, located at the four corners of the raft.

6. A method of using the vibration isolation system for marine machinery based on active adjustment of installation status as described in any one of the preceding claims, characterized in that, Includes the following: When further vibration isolation is required, the floating raft actuator is in a disengaged state and does not transmit vibration. The equipment actuator adjusts its support or disengagement state according to whether the equipment is running. When acoustic camouflage is required, the floating raft actuator is in a supported state and transmits vibration. The equipment actuator adjusts its support or disengagement state according to whether the equipment is running.

7. The method of using the marine mechanical equipment vibration isolation system based on active adjustment of installation status as described in claim 6, characterized in that, When it is necessary to further improve the vibration isolation effect, the adjustment principle of the equipment actuator is as follows: The equipment actuator is in a separated state for the equipment that is running on the floating raft and does not transmit vibration; for the equipment that is not running on the floating raft, the equipment actuator is in a supporting state, and the equipment that is not running forms an effective intermediate mass of the floating raft, which further improves the vibration isolation effect of the floating raft on the basis of the existing vibration isolation effect.

8. The method of using the marine mechanical equipment vibration isolation system based on active adjustment of installation status as described in claim 6, characterized in that, When acoustic camouflage functionality is required, the adjustment principles for the device's actuators are as follows: For operating equipment, the actuators are in a supported state, transmitting vibration; for non-operating equipment, the actuators are in a disengaged state, not transmitting vibration, nor increasing the effective intermediate mass of the raft. At this time, the ship's radiated noise is at its maximum, achieving acoustic camouflage and preventing the ship's accurate acoustic information from being obtained.

9. The method of using the marine mechanical equipment vibration isolation system based on active adjustment of installation status as described in claim 6, characterized in that, When multiple pump sets are arranged on the floating raft, the actuators of the randomly selected operating pump sets are in a supported state, causing the ship to exhibit different acoustic characteristics.

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