A diesel generator set floating raft vibration isolation monitoring method
By designing a vibration isolation monitoring device for diesel generator set floating rafts, and using sensors and data processing systems to monitor the displacement and vibration of the floating rafts in real time, the problem of floating raft position deviation affecting the vibration isolation effect is solved, and the reliability of diesel generator sets is improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HENAN DIESEL ENGINE IND
- Filing Date
- 2024-08-26
- Publication Date
- 2026-08-04
AI Technical Summary
The location of existing diesel generator set floating rafts is difficult to monitor manually, which affects the vibration isolation effect and reliability.
Design a vibration isolation monitoring device for a diesel generator set floating raft. The device uses displacement sensors and vibration sensors to monitor the axial, lateral, and vertical displacements and vibrations of the floating raft in real time. Data is processed and analyzed by a data acquisition instrument and a host computer to detect anomalies and issue early warnings in a timely manner.
It enables accurate monitoring of the displacement and vibration of the floating raft, improving the operational reliability and vibration isolation effect of the diesel generator set.
Smart Images
Figure CN118934250B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of marine diesel engine technology, specifically designing a vibration isolation monitoring device and monitoring method for a diesel generator set floating raft. Background Technology
[0002] Diesel engines are widely used in various fields due to their excellent thermal efficiency and power performance. Diesel generator sets are the main source of power on ships for emergency power generation. When installing diesel generator sets on boats, a vibration isolation device is usually installed to effectively isolate the vibration of the diesel generator set from the transmission to the hull, so as to play a supporting and auxiliary vibration reduction role. In the double-layer vibration isolation system, there is also a floating raft device between the upper and lower vibration isolation levels. The position of the floating valve is constantly changing during operation and is usually difficult to monitor manually. If the floating raft position is too far off, it will affect the vibration isolation effect and the reliability of the entire generator set. Summary of the Invention
[0003] The technical problem to be solved by this invention is to overcome the existing defects and solve the engine vibration isolation problem. It provides a vibration isolation monitoring device and method for a diesel generator set floating raft, designs a double-layer vibration isolation floating raft device, and monitors its displacement and vibration during operation. It can detect the axial, lateral, and vertical spatial displacement of the floating raft and the resonance of the floating raft in a timely manner so as to take timely measures to improve the reliability of the diesel generator set.
[0004] To achieve the above objectives, the present invention provides the following technical solution: a diesel generator set floating raft vibration isolation monitoring device, comprising a diesel generator set consisting of a diesel engine and a generator transmission connection, and a base; the base is fixed on the foundation, and a plurality of evenly distributed lower vibration isolators are fixed on the upper surface of the base, the upper ends of the lower vibration isolators being fixedly connected to the floating raft; a plurality of upper vibration isolators are fixedly connected to the upper end of the floating raft, the plurality of upper vibration isolators being divided into two groups, respectively connected to the left and right sides of the lower end of the diesel generator set; each of the upper vibration isolators tilts to support the diesel generator set; it also includes a displacement sensor, a vibration sensor, a data acquisition instrument, and a host computer; the displacement sensor and the vibration sensor are respectively used to detect the displacement and vibration of the floating raft, and are both electrically connected to the data acquisition instrument, which is electrically connected to the host computer, for monitoring the displacement and vibration of the floating raft when the diesel generator set is working.
[0005] As a further optimization, there are multiple displacement sensors, all of which are fixed to the foundation by a fixing frame, so that the displacement sensors are not connected to the diesel generator set, the raft, and the base.
[0006] As a further optimization, the plurality of displacement sensors include displacement sensor I, displacement sensor II, displacement sensor III, and displacement sensor IV; the measuring ends of displacement sensor I, displacement sensor II, displacement sensor III, and displacement sensor IV are all facing upward and are vertically close to the lower surface of the raft, with a certain gap, for detecting the vertical displacement of the raft.
[0007] As a further optimization, the plurality of displacement sensors also include displacement sensor V, displacement sensor VI, displacement sensor VII, and displacement sensor VIII; displacement sensor V and displacement sensor VI are located at one end of the raft, and displacement sensor VII and displacement sensor VIII are located at the other end of the raft, and each of them has a gap with the end face of the raft, for detecting the axial displacement of the raft.
[0008] As a further optimization, the plurality of displacement sensors also include displacement sensor IX, displacement sensor X, displacement sensor XI, and displacement sensor XII; displacement sensor IX and displacement sensor X are located on one side of the raft, and displacement sensor XI and displacement sensor XII are located on the other side of the raft; and all are horizontally installed with their measuring ends close to the raft but with gaps, for detecting the lateral displacement of the raft.
[0009] As a further optimization, there are four vibration sensors, which are evenly distributed on the upper surface of the raft and are all fixedly connected to the raft.
[0010] The present invention also provides a monitoring method for a diesel generator set floating raft vibration isolation monitoring device, which, using the above-described diesel generator set floating raft vibration isolation monitoring device, includes the following steps:
[0011] S1: The speed of the diesel generator set is slowly increased from the lowest speed to the highest speed, and three sets of data are recorded every 20 r / min. The data acquisition instrument simultaneously collects the displacement data of the displacement sensor at each speed state.
[0012] S2: The data acquisition instrument transmits the raft displacement data to the host computer; the host computer further processes and analyzes the displacement data, compares the actual displacement value of the float valve under each rotation speed state with the preset safe displacement value, and if the actual displacement value exceeds the safe displacement value, it determines that the float valve is malfunctioning and issues an early warning through the host computer.
[0013] As a further optimization, in step S1, the data acquisition instrument also simultaneously acquires vibration data from vibration sensors at various rotational speeds; in step S2, the data acquisition instrument transmits the raft vibration data to the host computer; the host computer further processes and analyzes the vibration data, comparing the actual vibration value of the float valve at each rotational speed with the preset safe vibration value. If the actual vibration value exceeds the safe vibration value, the float valve is determined to be malfunctioning, and an early warning is issued through the host computer; wherein, the safe vibration value is above the float valve vibration value at the resonant rotational speed; the method for obtaining the resonant rotational speed is that as the rotational speed increases, the vibration values at each measuring point of the raft slowly increase with the rotational speed, and at a certain rotational speed, the vibration values reach their maximum. When the rotational speed is further increased, the vibration values at each measuring point slowly decrease with the rotational speed. The rotational speed at which the vibration values reach their maximum can be determined as the resonant rotational speed of the raft.
[0014] As a further optimization, when the diesel generator set rotates at the resonant speed, an early warning is issued via the host computer.
[0015] Compared with the prior art, the beneficial effects of the present invention are:
[0016] This invention can accurately and synchronously measure the axial, lateral, and vertical spatial displacement of the floating raft in the double-layer vibration isolation operation of a diesel generator set, as well as perform floating raft vibration testing. It can accurately analyze the spatial displacement changes of the floating raft of the diesel generator set, so that measures can be taken as early as possible when the floating valve displacement exceeds the standard, thereby improving the reliability of the diesel generator set. Attached Figure Description
[0017] Figure 1 This is a structural schematic diagram from one perspective of Embodiment 1 of the present invention;
[0018] Figure 2 This is a structural schematic diagram from another perspective of Embodiment 1 of the present invention.
[0019] In the diagram: 1. Diesel engine, 2. Generator, 3. Upper vibration isolator, 4. Floating raft, 5. Lower vibration isolator, 6. Base, 7. Displacement sensor VI, 8. Displacement sensor V, 9. Displacement sensor I, 10. Displacement sensor II, 11. Displacement sensor X, 12. Displacement sensor IX, 13. Vibration sensor I, 14. Vibration sensor II, 15. Displacement sensor VII, 16. Displacement sensor III, 17. Displacement sensor IV, 18. Displacement sensor XI, 19. Displacement sensor XII, 20. Vibration sensor III, 21. Vibration sensor IV, 22. Displacement sensor VIII, 23. Data acquisition instrument, 24. Host computer. Detailed Implementation
[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.
[0021] Please see Figure 1-2 This invention provides a technical solution: a vibration isolation monitoring device for a diesel generator set floating raft. Displacement sensors I9, II10, III16, and IV17 are vertically and synchronously installed on the lower surface of the floating raft 4 to measure the vertical displacement of the floating raft 4. All displacement sensors I9, II10, III16, and IV17 are installed facing upwards, with their measuring surfaces perpendicular to the lower surface of the floating raft 4 and leaving a certain gap. They are fixed to the ground by relevant fixing devices and are not connected to any component of the diesel generator set. Displacement sensor I9 measures the vertical displacement change of the floating raft 4 below the A-row diesel engine 1; displacement sensor II10 measures the vertical displacement change of the floating raft 4 below the A-row generator 2; displacement sensor III16 measures the vertical displacement change of the floating raft 4 below the B-row diesel engine 1; and displacement sensor IV17 measures the vertical displacement change of the floating raft 4 below the B-row generator 2.
[0022] The data acquisition instrument 23 synchronously acquires the vertical displacement data of the float valve 4 measured by displacement sensor I9, displacement sensor II10, displacement sensor III16, and displacement sensor IV17; the data acquisition instrument 23 processes the vertical displacement data and transmits it to the host computer 24; the host computer 24 further processes and analyzes the data to obtain the spatial displacement change of the float valve 4 in the vertical direction.
[0023] Displacement sensors V8, VI7, VII15, and VIII22 are synchronously installed at the front and rear horizontal positions under the floating raft 4. All displacement sensors V8, VI7, VII15, and VIII22 are installed horizontally, with their measuring surfaces perpendicular to the front and rear planes of the floating raft 4, leaving a certain gap. They are fixed to the ground by relevant fixing devices and are not connected to any components of the diesel generator set. Displacement sensor V8 measures the axial displacement change of the front end of column A of the floating raft 4; displacement sensor VI7 measures the vertical displacement change of the front end of column B of the floating raft 4; displacement sensor VII15 measures the axial displacement change of the rear end of column B of the floating raft 4; and displacement sensor VII22 measures the axial displacement change of the rear end of column B of the floating raft 4.
[0024] The data acquisition instrument 23 synchronously acquires the horizontal axial displacement data of the front and rear ends of the float valve 4 measured by displacement sensors V8, VI7, VII15, and VIII22; the data acquisition instrument 23 processes the axial displacement data and transmits it to the host computer 24; the host computer 24 further processes and analyzes the data to obtain the spatial displacement change of the horizontal axis of the float valve 4.
[0025] Displacement sensors IX12, X11, XI18, and XII19 are horizontally installed on both sides of the raft. These sensors are all horizontally installed with their measuring surfaces perpendicular to the planes on either side of the raft 4, and are fixed to the ground by relevant fixing devices, without being connected to any component of the diesel generator set. Displacement sensor IX is used to measure the lateral displacement of the raft 4 below the diesel engine 1 in row 4A; displacement sensor X is used to measure the lateral displacement of the raft 4 below the generator 2 in row 4A; displacement sensor XI is used to measure the lateral displacement of the raft 4 below the diesel engine 1 in row 4B; and displacement sensor XII is used to measure the lateral displacement of the raft 4 below the generator 2 in row 4B.
[0026] The data acquisition instrument 23 synchronously acquires the horizontal displacement data of both sides of the float valve 4 measured by displacement sensor IX12, displacement sensor X11, displacement sensor XI18, and displacement sensor XII19; the data acquisition instrument 23 processes the horizontal displacement data information and transmits it to the host computer 24; the host computer 24 further processes and analyzes the data to obtain the change of the horizontal spatial displacement of the float valve 4.
[0027] Vibration sensors I13, II14, III20, and IV21 are installed on the upper surface of the floating raft 4. These sensors are firmly attached to the upper surface of the floating raft 4 using adhesive. All sensors are triaxial vibration sensors, capable of measuring lateral, axial, and vertical vibrations. Vibration sensor I13 measures the vibration data of the floating raft 4 below the diesel engine 1 in row 4A. Vibration sensor II14 measures the vibration changes of the floating raft 4 below the generator 2 in row 4A. Vibration sensor III20 measures the vibration changes of the floating raft 4 below the diesel engine 1 in row 4B. Vibration sensor IV21 measures the vibration changes of the floating raft 4 below the generator 2 in row 4B.
[0028] The data acquisition instrument 23 synchronously acquires the vibration data of the float valve 4 measured by vibration sensor I13, vibration sensor II14, vibration sensor III20, and vibration sensor IV21. The data acquisition instrument 23 processes the vibration data and transmits it to the host computer 24. The host computer 24 further processes and analyzes the data to accurately obtain the lateral, axial, and vertical vibration changes of the float under various working conditions.
[0029] During the test, an unloaded test was first conducted. Generator 2 was unloaded, and the diesel generator set speed was slowly increased from the lowest speed to the highest speed. Three sets of data were recorded every 20 r / min. The data acquisition instrument simultaneously collected displacement data from displacement sensors I9, II10, III16, IV17, V8, VI7, VII15, VIII22, IX12, X11, XI18, and XII19 regarding the vertical, axial, and lateral displacements of the floating raft 4 under unloaded conditions at each speed. The data acquisition instrument 23 transmitted the vertical, axial, and lateral displacement data of the floating raft 4 to the host computer 24. The host computer 24 then processed and analyzed the data, transmitting the vertical, axial, and lateral displacement data of the floating raft 4 under unloaded conditions at each speed. By comparing the lateral displacement results with the vertical displacement results, the maximum, minimum, and average values of the vertical, axial, and lateral displacements of float 4 under no-load conditions at various speeds are analyzed. The changes in the vertical, axial, and lateral displacements of float 4 under no-load conditions, as well as the changes in the maximum, minimum, and average values, are analyzed as the speed increases. The vertical, axial, and lateral displacement results of float 4 under no-load conditions at various speeds are then input into a three-dimensional coordinate system to obtain the spatial displacement changes of float 4 in three-dimensional form under no-load conditions at various speeds, and the changes in the spatial displacement of float 4 in three-dimensional form as the speed increases. By analyzing the changes in the vertical, axial, and lateral displacements of float 4 under no-load conditions, as well as the changes in the maximum, minimum, and average values, as the speed increases, it is possible to determine to some extent whether the working state of float 4 is abnormal, providing a basis for fault diagnosis. A safe displacement value is obtained through the displacement change pattern, and then the safe displacement value is compared with the actual displacement value to determine whether the float valve is malfunctioning.
[0030] During the no-load test, the data acquisition instrument 23 synchronously collects vibration data of the floating raft 4 from vibration sensors I13, II14, III20, and IV21 at various speeds under no-load conditions, in the vertical, axial, and lateral directions. The data acquisition instrument 23 transmits the vertical, axial, and lateral vibration data of each measuring point of the floating raft 4 to the host computer 24. The host computer 24 further processes and analyzes the data: it analyzes the vibration results of the floating raft 4 at the measuring points of vibration sensors I13, II14, III20, and IV21 at various speeds under no-load conditions, and obtains the vertical vibration data of the floating raft 4 at each measuring point under various speeds under no-load conditions. The maximum, minimum, and average values of vertical, axial, and lateral vibrations were obtained, showing the changes in vertical, axial, and lateral displacements of the floating raft 4 as the rotational speed increased, as well as the changes in the maximum, minimum, and average values. By analyzing the changes in the vertical, axial, and lateral vibration values of each measuring point of the floating raft 4 under no-load conditions as the rotational speed increased, it can be determined whether the floating raft 4 resonates within its operating speed range. The method is as follows: as the rotational speed increases, the vibration values of each measuring point of the floating raft 4 under no-load conditions gradually increase with the rotational speed. At a certain rotational speed, the vibration values reach their maximum. Further increasing the rotational speed causes the vibration values of each measuring point to gradually decrease. This rotational speed can be identified as the resonance rotational speed of the floating raft 4. The actual vibration values of the float valve at each rotational speed are compared with the preset safe vibration values. If the actual vibration value exceeds the safe vibration value, the float valve is determined to be malfunctioning, and an early warning is issued through the host computer. Among them, the vibration value at the safe position is above the vibration value at the resonance speed, but if the floating raft 4 is at the resonance speed for a long time, an early warning will also be issued, or when the speed of the diesel generator set is the resonance speed, an early warning will be issued through the host computer. When the speed exceeds or falls below the resonance speed, no early warning will be issued, and the diesel generator set will continue to work.
[0031] After the no-load test, a load test was conducted. During the load test, the speed was increased from the lowest to the highest, and the data was collected in groups of 20 r / min. Data acquisition instrument 23 was used to simultaneously collect data on the diesel generator set from the lowest load to the maximum load at each speed. Displacement sensors I9, II10, III16, IV17, V8, VI7, VII15, VIII22, IX12, X11, XI18, and XII19 were used to measure the vertical and axial direction of the floating raft 4. The data acquisition instrument 23 transmits the displacement and vibration test data of the floating raft 4 in the vertical, axial, and lateral directions to the host computer 24, along with the vertical and lateral displacement data and vibration data of vibration sensors I13, II14, III20, and IV21. The host computer 24 analyzes the test data collected by each displacement and vibration sensor at different speeds and loads according to the analysis method described above, and analyzes the law of change of the floating raft 4 with the load at different speeds. It obtains the safe displacement value and then compares the safe displacement value with the actual displacement value to determine whether the floating valve is malfunctioning.
[0032] The advantages of this embodiment are as follows.
[0033] This invention can accurately and synchronously measure the axial, lateral, and vertical spatial displacement of the floating raft in the double-layer vibration isolation operation of a diesel generator set, as well as perform floating raft vibration testing. It can accurately analyze the spatial displacement changes of the floating raft of the diesel generator set, so that measures can be taken as early as possible when the floating valve displacement exceeds the standard, thereby improving the reliability of the diesel generator set.
[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A method for monitoring vibration isolation on a floating raft of a diesel generator set, characterized in that: A monitoring device is used, the monitoring device includes a diesel generator set consisting of a diesel engine (1) and a generator (2) connected by transmission and a base (6); the base (6) is fixed on the foundation, and a plurality of evenly distributed lower vibration isolators (5) are fixed on the upper surface of the base (6), and the upper end of the lower vibration isolators (5) is fixedly connected to a floating raft (4); the upper end of the floating raft (4) is fixedly connected to a plurality of upper vibration isolators (3), the plurality of upper vibration isolators (3) are divided into two groups, respectively connected to the left and right sides of the lower end of the diesel generator set; each of the upper vibration isolators (3) supports the diesel generator set at an incline; It also includes a displacement sensor, a vibration sensor, a data acquisition instrument (23), and a host computer (24); the displacement sensor and the vibration sensor are used to detect the displacement and vibration of the raft (4) respectively, and are both electrically connected to the data acquisition instrument (23). The data acquisition instrument (23) is electrically connected to the host computer (24) and is used to monitor the displacement and vibration of the raft (4) when the diesel generator set is working. There are four vibration sensors, which are evenly distributed on the upper surface of the raft (4) and are all fixedly connected to the raft (4); When using it, the following steps are included: S1: The speed of the diesel generator set is slowly increased from the lowest speed to the highest speed. Three sets of data are recorded every 20 r / min. The data acquisition instrument (23) synchronously collects the displacement data of the displacement sensor under each speed state. S2: The data acquisition instrument (23) transmits the displacement data of the raft (4) to the host computer (24); the host computer (24) further processes and analyzes the displacement data, and analyzes the changes in vertical, axial and lateral displacements of the raft (4) under no-load conditions as the rotation speed increases, as well as the changes in the maximum value, minimum value and average value. The actual displacement value of the float valve under each speed state is compared with the preset safe displacement value. If the actual displacement value exceeds the safe displacement value, it is determined that the float valve is malfunctioning and an early warning is issued through the host computer (24). In step S1, the data acquisition instrument (23) also synchronously acquires vibration data from the vibration sensor at each rotation speed. In step S2, the data acquisition instrument (23) transmits the vibration data of the floating raft (4) to the host computer (24); the host computer (24) further processes and analyzes the vibration data, compares the actual vibration value of the floating valve under each rotation speed state with the preset safe vibration value, and if the actual vibration value exceeds the safe vibration value, it determines that the floating valve is malfunctioning and issues an early warning through the host computer (24); Among them, the safe vibration value is above the float valve vibration value at the resonant speed; The method for obtaining the resonant rotation speed is as follows: as the rotation speed increases, the vibration values of each measuring point of the raft (4) increase slowly with the rotation speed. At a certain rotation speed, the vibration value reaches the maximum. When the rotation speed is increased further, the vibration values of each measuring point decrease slowly with the rotation speed. The rotation speed at which the vibration value reaches the maximum can be judged as the resonant rotation speed of the raft (4). When the diesel generator set rotates at the resonant speed, an early warning is issued through the host computer (24).
2. The method for monitoring vibration isolation of a diesel generator set floating raft according to claim 1, characterized in that: There are multiple displacement sensors, all of which are fixed to the foundation by a fixing frame, so that the displacement sensors are not connected to the diesel generator set, the raft (4) and the base (6).
3. The method for monitoring vibration isolation of a diesel generator set floating raft according to claim 2, characterized in that: The plurality of displacement sensors include displacement sensor I (9), displacement sensor II (10), displacement sensor III (16), and displacement sensor IV (17). The measuring ends of displacement sensors I (9), II (10), III (16) and IV (17) are all facing upwards and are vertically close to the lower surface of the raft (4), with a certain gap, for detecting the vertical displacement of the raft (4).
4. The method for monitoring vibration isolation of a diesel generator set floating raft according to claim 3, characterized in that: The plurality of displacement sensors also include displacement sensor V (8), displacement sensor VI (7), displacement sensor VII (15), and displacement sensor VIII (22); The displacement sensor V (8) and displacement sensor VI (7) are located at one end of the raft (4), and the displacement sensor VII (15) and displacement sensor VIII (22) are located at the other end of the raft (4). Both of them have gaps between them and the end face of the raft (4) for detecting the axial displacement of the raft (4).
5. The method for monitoring vibration isolation of a diesel generator set floating raft according to claim 4, characterized in that: The plurality of displacement sensors also include displacement sensor IX (12), displacement sensor X (11), displacement sensor XI (18), and displacement sensor XII (19). The displacement sensor IX (12) and displacement sensor X (11) are located on one side of the raft (4), and displacement sensor XI (18) and displacement sensor XII (19) are located on the other side of the raft (4). They are all horizontally installed, with their measuring ends close to the raft (4) but with gaps, for detecting the lateral displacement of the raft (4).