CN110579334B - Mechanical type multipurpose ship model restoring force measuring device and method - Google Patents
Mechanical type multipurpose ship model restoring force measuring device and method Download PDFInfo
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- CN110579334B CN110579334B CN201910903724.XA CN201910903724A CN110579334B CN 110579334 B CN110579334 B CN 110579334B CN 201910903724 A CN201910903724 A CN 201910903724A CN 110579334 B CN110579334 B CN 110579334B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
Abstract
The invention relates to a mechanical type multipurpose ship model restoring force measuring device, which comprises a multipurpose restoring force measuring rod, an auxiliary measuring frame and a measuring counterweight module, wherein the multipurpose restoring force measuring rod is connected with the auxiliary measuring frame and is provided with an angle measuring device and a vertical displacement measuring device and used for measuring restoring force or moment of a ship model in the directions of rolling, pitching and heaving; the auxiliary measuring frame is a set of multipurpose rod frame system and is used for carrying a measuring balancing weight, connecting a multipurpose restoring force measuring rod and fixedly connecting a ship model; and the measuring counterweight module is a counterweight block for measurement and is fixedly arranged on the auxiliary measuring frame. The invention has scientific and reasonable arrangement, simple mechanical structure, convenient manufacture, lower cost, simple use and higher precision, can be used for measuring the linear restoring force or moment of the ship model in the rolling, pitching and heaving directions in still water, and has wide application range.
Description
Technical Field
The invention belongs to the technical field of ship engineering pool tests, and relates to a mechanical multipurpose ship model restoring force measuring device, in particular to a mechanical multipurpose ship model restoring force measuring device and method.
Background
Currently, model testing is a commonly used method for predicting the hydro-dynamic performance of ships and marine structures. However, for the measurement test of some ship hydrodynamic performance parameters, the conditions of imperfect and irregular measurement technology and measurement equipment still exist, and the factors greatly influence the complexity of the test operation and even interfere the accuracy of the measurement result.
The restoring force of the ship is one of basic hydrodynamic performance of the ship and is an important parameter of ship stability, and the size of the restoring force depends on the displacement of the ship, the relative position of the gravity center and the floating center and other factors. At present, the method for acquiring the restoring force of the ship mainly adopts an empirical formula method, has the advantages of simplicity, convenience and the like, but has a larger relation between the precision and parameters such as the ship type, the main scale and the like. In the aspect of a water tank test, a test device which has a simple structure and is convenient to process and can directly measure the restoring force of the ship in the rolling, pitching and heaving directions is lacked, so that the design of a set of simple, easy-to-use, effective and standard restoring force measuring device is particularly important.
Through the search of the published patent documents, a published patent document similar to the patent application is found:
the invention patent CN106289722A discloses a 'ship model transverse force and transverse restoring moment measuring instrument', which is a measuring instrument for measuring a transverse force and a transverse restoring moment generated by model heeling in a ship model heeling test. The main contents are as follows: the device includes main slip unit, inferior slip unit, automatic uninstallation unit, the load unit, the angular adjustment unit, the upper and lower both sides of airworthiness appearance set up mounting panel and lower mounting panel, the upper end of main slip unit is connected with the airworthiness appearance through last mounting panel and lower mounting panel, the upper end of inferior slip unit is connected with the airworthiness appearance through last mounting panel and lower mounting panel, the load unit is connected to the lower extreme of main slip unit, the angular adjustment unit is connected to load unit lower extreme, the unit is uninstalled to the dead weight is connected to inferior slip unit's lower extreme. The device realizes the measurement of the transverse force and the transverse restoring moment of the ship model in complex environmental engineering and test environment, but the device can only measure the transverse force and the transverse restoring moment, and cannot measure the longitudinal restoring moment and the vertical restoring force of the ship; in addition, the main force transducer of the device is a six-component balance, and the balance has higher manufacturing cost, so that the manufacturing cost of the device can be greatly increased.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a mechanical multipurpose ship model restoring force measuring device and method, which have the advantages of simple mechanical structure, convenience in manufacturing, lower cost, simplicity in use, higher precision, wide application range and the like, can be used for measuring linear restoring force or moment of a ship model in the rolling, pitching and heaving directions in still water, and are suitable for measuring the linear restoring force or moment of the ship model in the rolling, pitching and heaving directions.
A mechanical type multipurpose ship model restoring force measuring device comprises a multipurpose restoring force measuring rod, an auxiliary measuring frame and a measuring counterweight module, wherein the multipurpose restoring force measuring rod is connected with the auxiliary measuring frame and is provided with an angle measuring device and a vertical displacement measuring device and used for measuring restoring force or moment of a ship model in the directions of rolling, pitching and heaving; the auxiliary measuring frame is a set of multipurpose rod frame system and is used for carrying a measuring balancing weight, connecting a multipurpose restoring force measuring rod and fixedly connecting a ship model; and the measuring counterweight module is a counterweight block for measurement and is fixedly arranged on the auxiliary measuring frame.
The multi-purpose restoring force measuring rod comprises a fixed measuring rod, a sliding measuring rod, a buffer spring, a self-reducing weight plate, an external guide pulley, an internal pulley, a traction steel cable, a sliding unit sleeve, a vertical measuring pointer, a rotating measuring dial, a measuring rod mounting base, a sliding rod rotating shaft end and a fixed connecting base, wherein the upper end of the fixed measuring rod is welded with the fixed connecting base, and the lower end of the fixed measuring rod is welded with the sliding unit sleeve; the sliding measuring rod is connected with the measuring rod mounting base through a sliding rod rotating shaft end, and the sliding rod rotating shaft end can rotate around a hole position on the mounting base; the rotation measuring pointer is fixedly arranged at the rotating shaft end of the sliding rod and can rotate along with the rotating shaft end of the sliding rod; the rotary measuring dial is fixedly arranged on the measuring rod mounting base; the sliding measuring rod can slide up and down along the pipe wall in the sliding unit sleeve, and a vertical measuring pointer is arranged at the rod end; the sliding unit sleeve is provided with a long-strip hole on the pipe wall and is marked with scales, a buffer spring is arranged inside the bottom end, an internal pulley is arranged at the axis of the top end, an external pulley is arranged at the end of an external boss, and the pulley is used for guiding and limiting a traction steel cable; the traction steel cable is connected with the end of the sliding measuring rod and the self-reducing counterweight plate.
The auxiliary measuring frame comprises a sliding rail, a sliding rod, a mounting base, a sliding rod locking device, an interface base locking device, a sliding rod measuring pointer and a base measuring pointer, wherein the sliding rail is welded with the mounting base and is connected with the sliding rod in a locking mode through the sliding rod locking device, and the interface base is connected with the interface base in a locking mode through the interface base locking device; the sliding rods can slide on the two sliding rails and are symmetrically arranged and locked with respect to the gravity center of the ship model along the ship length direction after being adjusted; the connector base and the connector base locking devices are 4 groups in total and can slide on the sliding rails and the sliding rods, wherein two groups of the connector base and the connector base locking devices are distributed on the sliding rails and symmetrically distributed and locked relative to the center of gravity of the ship model along the ship width direction, and the other two groups of the connector base and the connector base locking devices are distributed on the sliding rods and symmetrically distributed and locked relative to the center of gravity on the middle longitudinal line of the ship model; the sliding rod locking device is provided with a sliding rod measuring pointer, the interface base locking device on the sliding rail is provided with a base measuring pointer, and the sliding rail is provided with sliding rail scales.
The counterweight measuring module comprises a counterweight limiting column, a fastening nut, a counterweight measuring sheet, a counterweight module mounting base and a counterweight base, wherein the counterweight limiting column is used for limiting the displacement of the counterweight measuring sheet, and the fastening nut is used for fixedly mounting the counterweight measuring sheet; the measuring counterweight plate is arranged on the counterweight base; the counterweight module mounting base is mounted on the interface base.
A mechanical type multipurpose ship model restoring force measuring method is characterized in that: the method comprises the following steps:
1) preparation before experiment: moving a support frame body or a beam structure suitable for mounting the device, such as a trailer, a pilot test instrument and the like, to a proper position of a water pool; adjusting 4 interface bases and locking and fixing the interface bases through a base locking device, wherein the interface bases on the sliding rail are positioned on a cross section where the gravity center is positioned, and the interface bases on the sliding rod are positioned on a middle longitudinal section where the gravity center is positioned and are symmetrically distributed relative to the gravity center; connecting the mounting bases of the two multi-purpose restoring force measuring rods with the interface bases on the sliding rails or the sliding rods respectively; the fixed connection bases of the two multi-purpose restoring force measuring rods are respectively locked and fixed with the cross beams of the support frame body or other frame bodies; connecting a counterweight module mounting base of the measurement counterweight module with an interface base on the slide rail or the slide rod, wherein the measurement counterweight module does not load a measurement counterweight sheet;
2) after the connection of the device is finished, continuously loading the weight plate on the self-weight-reducing weight plate in the multi-purpose restoring force measuring rod until the measuring pointer can be stably maintained at the middle position of the scale mark on the sleeve of the sliding unit, and recording the weight WP0 of the LV0 and the self-weight-reducing weight plate; after the ship model is placed in water, the four mounting bases of the auxiliary measuring frame are fixedly mounted on the ship model, wherein the mounting bases of the slide rails need to be symmetrical about the gravity center of the ship model along the width direction of the ship; the scale LV1 recording the measuring pointer;
3) longitudinal restoring force measurement: after the steps 1) and 2), fixedly connecting the mounting base with an interface base on the slide rail, fixedly connecting the measuring counterweight module with the interface base on the slide bar, recording the scale DR0 of the rotating measuring pointer on the rotating measuring dial, and recording the scales of the slide bar measuring pointer and the base measuring pointer as LX0 and LO0 respectively. Meanwhile, a counterweight WX1 with equal mass is added on the single-side measuring counterweight module and the self-reducing counterweight, and the scale DR1 of the rotation measuring pointer on the rotation measuring dial is recorded after the system is stabilized. The longitudinal restoring force coefficient Kyy can be found;
4) measurement of transverse restoring force: after the steps 1) and 2), fixedly connecting the mounting base with the interface base on the sliding rod, fixedly connecting the measuring counterweight module with the interface base on the sliding rail, recording the scale DR2 of the rotating measuring pointer on the rotating measuring dial, recording the distance between the interface bases on the sliding rail as LY, simultaneously adding counterweights WX2 with equal mass on the unilateral measuring counterweight module and the self-counterweight plate, and recording the scale DR3 of the rotating measuring pointer on the rotating measuring dial after the system is stabilized. The longitudinal restoring force coefficient Kxx can be solved;
5) vertical restoring force measurement: after the step 1) and the step 2), the mounting base is fixedly connected with an interface base on the slide rail, the measuring counterweight module is fixedly connected with the interface base on the slide bar, or the mounting base is fixedly connected with the interface base on the slide bar, and the measuring counterweight module is fixedly connected with the interface base on the slide rail; meanwhile, balance weights WX3 with equal mass are added on the balance weight modules on the two sides and the self-reducing balance weight piece, and after the system is stabilized, scales LV2 of a measuring pointer are recorded, so that the longitudinal restoring force coefficient Kz can be obtained.
The invention has the advantages and beneficial effects that:
1. the invention relates to a mechanical type multipurpose ship model restoring force measuring device, which is a multipurpose restoring force measuring device, can be used for measuring restoring forces/moments of ship model in rolling, pitching and yawing directions, can also be used for calculating linear restoring force coefficients in three degrees of freedom, is provided with a self-reducing counterweight module, can also eliminate errors caused by a device system, improves the measuring precision, and has wide application range.
2. The mechanical multipurpose ship model restoring force measuring device disclosed by the invention is used only by fixing the device on the cross beam without other use requirements, can be installed on equipment such as a pilot test instrument, a pool trailer cross beam, a simple frame body and the like, is strong in usability, and the auxiliary measuring frame in the device can adjust the structural size to adapt to various ship models.
3. The mechanical type multipurpose ship model restoring force measuring device provided by the invention adopts a full mechanical structure, is simple in measuring principle, reasonable in structural design, easy to use and capable of repeatedly carrying out tests.
4. The mechanical type multipurpose ship model restoring force measuring device disclosed by the invention has the advantages that the design parts are common components, the structure is simple, the manufacturing and processing cost is lower, and the economy is very good.
5. The mechanical multipurpose ship model restoring force measuring device has the advantages that the auxiliary measuring frame has extremely strong functionality and usability, and can be used as an inertia measuring auxiliary frame, a resistance test guiding device auxiliary mounting frame and the like.
6. The invention has scientific and reasonable arrangement, simple mechanical structure, convenient manufacture, lower cost, simple use and higher precision, can be used for measuring the linear restoring force or moment of the ship model in the rolling, pitching and heaving directions in still water, and has wide application range.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of a multi-purpose restoring force measuring rod according to the present invention;
FIG. 3 is a front view of the multi-purpose restoring force measuring rod of the present invention;
FIG. 4 is a side view of the multi-purpose restoring force measuring rod of the present invention;
FIG. 5 is a front view of an auxiliary measuring stand according to the present invention;
FIG. 6 is a top view of an auxiliary measuring stand according to the present invention;
FIG. 7 is a side view of an auxiliary measuring stand according to the present invention;
FIG. 8 is a front view of a instrumented counterweight module of the present invention;
fig. 9 is a side view of a instrumented weight module of the present invention.
Description of the reference numerals
1-ship model, 2-support frame body, 3-multipurpose restoring force measuring rod, 4-auxiliary measuring frame, 5-measuring counterweight module, 6-fixed measuring rod, 7-sliding measuring rod, 8-buffer spring, 9-self-reducing counterweight sheet, 10-external guide pulley, 11-internal pulley, 12-traction steel cable, 13-sliding unit sleeve, 14-vertical measuring pointer, 15-rotating measuring pointer, 16-rotating measuring dial, 17-measuring rod mounting base, 18-sliding rod rotating shaft end, 19-fixed connecting base, 20-sliding rail, 21-sliding rod, 22-mounting base, 23-sliding rod locking device, 24-interface base, 25-interface base locking device, 26-sliding rod measuring pointer, 27-base measuring pointer, 28-counterweight limiting column, 29-fastening nut, 30-measuring counterweight sheet, 31-counterweight module mounting base and 32-counterweight base.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.
As shown in fig. 1, a mechanical multipurpose ship model restoring force measuring device comprises a multipurpose restoring force measuring rod 3, an auxiliary measuring frame 4 and a measuring counterweight module 5, wherein the top end of the multipurpose restoring force measuring rod is fixedly arranged on a support frame body 2, and the bottom end of the multipurpose restoring force measuring rod is connected with the auxiliary measuring frame; the auxiliary measuring frame is a set of multi-purpose rod frame system and is used for carrying a measuring balancing weight, connecting a multi-purpose restoring force measuring rod and fixedly connecting the ship model 1; the measuring counterweight module is a counterweight block specially designed for measurement and is fixedly arranged on the auxiliary measuring frame.
As shown in fig. 2 to 4, the fixed measuring rod 6 of the multi-purpose restoring force measuring rod may be a square pipe, the upper end of which is welded to the fixed connection base 19 and the lower end of which is welded to the sliding unit casing 13; the sliding measuring rod 7 is made of a square pipe, a sliding rod rotating shaft end 18 is arranged at the bottom end of the pipe, two bearings are arranged at hole positions on the mounting base 17, and the sliding rod rotating shaft end is sleeved in the bearings and can rotate around the mounting base 17; the rotating measuring pointer 15 is welded and fixed with the rotating shaft end of the sliding rod; the rotary measuring dial 16 is provided with angle scales, is fixedly arranged on the measuring rod mounting base and can rotate along with the measuring rod mounting base; during the measurement, measuring stick installation base rotates and will drive and measure the calibrated scale, can measure the contained angle of auxiliary measuring frame and multi-purpose resilience measuring stick through rotating the measurement pointer, the angle of ship model list or trim promptly.
The sliding measuring rod 7 can slide up and down along the pipe wall in the sliding unit sleeve, and a vertical measuring pointer 14 is arranged at the rod end of the sliding measuring rod; the sliding unit sleeve is provided with a long-strip hole in the middle of the outer pipe wall and marked with scales, and a buffer spring 8 is arranged inside the bottom end of the sliding unit sleeve, so that the impact caused by sudden bottoming of the sliding measuring rod can be relieved; the measuring pointer is matched with the strip-shaped hole and the scales on the sleeve of the sliding unit, and the displacement distance of the ship model in the vertical direction can be measured.
Further, an internal pulley 11 is arranged at the axis of the top end of the sliding unit sleeve, a single-side hole is formed in the position of the fixed measuring rod, the sliding unit sleeve is provided with a boss, an external pulley 10 is arranged at the end of the boss, and the two pulleys are used for guiding and limiting a traction steel cable 12; the traction steel cable is connected with the end of the sliding measuring rod and the base of the self-reducing counterweight plate 9; the self-weight-reducing plate can be loaded or unloaded and adjusted according to the overall weight of the sliding measuring rod, the auxiliary measuring frame and the measuring weight module 5 so as to eliminate the error of the self-weight of the measuring system on the measuring result;
as shown in fig. 5 to 7, the auxiliary measuring rack includes a slide rail 20, a slide rod 21, a mounting base 22, a slide rod locking device 23, an interface base 24, an interface base locking device 25, a slide rod measuring pointer 26, and a base measuring pointer 27. Two sliding rails are installed in parallel; the sliding rails are welded with the mounting base, are locked and connected with the sliding rods through the sliding rod locking devices, are locked and connected with the interface base through the interface base locking devices, can slide on the two sliding rails in parallel, and are symmetrically arranged and locked with respect to the center of gravity of the ship model along the ship length direction after being adjusted; the interface base and the interface base locking devices are 4 groups and can slide on the sliding rails and the sliding rods, wherein two groups of the interface base and the interface base locking devices are distributed on the sliding rails and symmetrically distributed and locked relative to the center of gravity of the ship model along the ship width direction, and the other two groups of the interface base and the interface base locking devices are distributed on the sliding rods and symmetrically distributed and locked relative to the center of gravity on the middle longitudinal line of the ship model; the sliding rod locking device is provided with a sliding rod measuring pointer, the interface base locking device on the sliding rail is provided with a base measuring pointer, the sliding rail is provided with sliding rail scales, and the position of the current sliding rod on the sliding rail and the longitudinal distance from the current sliding rod to the center of gravity of the ship model can be measured through the sliding rod measuring pointer, the base measuring pointer and the sliding rail scales.
As shown in fig. 8 and 9, the measurement counterweight module is composed of a counterweight limiting column 28, a fastening nut 29, a measurement counterweight sheet 30, a counterweight module mounting base 31 and a counterweight base 32. The balance weight limiting column is provided with threads on the outer side of the column body, and a measuring balance weight piece can be fixedly installed by matching with a fastening nut; the measuring counterweight plate is arranged on the counterweight base; the counterweight module mounting base is mounted on the interface base.
The locking devices related to the fixed connection base, the sliding rod locking device and the interface base locking device all adopt the form of an upper clamping piece and a lower clamping piece, and after holes are formed in the clamping pieces, 2 screws are used for tightening.
The base that measuring stick installation base, interface base, counter weight module installation base related all opens at the base four corners has the screw hole site, through the screw fastening connection that runs through the base.
A mechanical type multipurpose ship model restoring force measuring method is characterized in that: the method comprises the following steps:
1) preparation before experiment: moving a support frame body or a beam structure suitable for mounting the device, such as a trailer, a pilot test instrument and the like, to a proper position of a water pool; adjusting 4 interface bases and locking and fixing the interface bases through a base locking device, wherein the interface bases on the sliding rail are positioned on a cross section where the gravity center is positioned, and the interface bases on the sliding rod are positioned on a middle longitudinal section where the gravity center is positioned and are symmetrically distributed relative to the gravity center; connecting the mounting bases of the two multi-purpose restoring force measuring rods with the interface bases on the sliding rails or the sliding rods respectively; the fixed connection bases of the two multi-purpose restoring force measuring rods are respectively locked and fixed with the cross beams of the support frame body or other frame bodies; connecting a counterweight module mounting base of the measurement counterweight module with an interface base on the slide rail or the slide rod, wherein the measurement counterweight module does not load a measurement counterweight sheet;
2) after the connection of the device is finished, continuously loading the weight plate on the self-weight-reducing weight plate in the multi-purpose restoring force measuring rod until the measuring pointer can be stably maintained at the middle position of the scale mark on the sleeve of the sliding unit, and recording the weight WP0 of the LV0 and the self-weight-reducing weight plate; after the ship model is placed in water, the four mounting bases of the auxiliary measuring frame are fixedly mounted on the ship model, wherein the mounting bases of the slide rails need to be symmetrical about the gravity center of the ship model along the width direction of the ship; the scale LV1 recording the measuring pointer;
3) longitudinal restoring force measurement: after the steps 1) and 2), fixedly connecting the mounting base with an interface base on the slide rail, fixedly connecting the measuring counterweight module with the interface base on the slide bar, recording the scale DR0 of the rotating measuring pointer on the rotating measuring dial, and recording the scales of the slide bar measuring pointer and the base measuring pointer as LX0 and LO0 respectively. Meanwhile, a counterweight WX1 with equal mass is added on the single-side measuring counterweight module and the self-reducing counterweight, and the scale DR1 of the rotation measuring pointer on the rotation measuring dial is recorded after the system is stabilized. The longitudinal restoring force coefficient Kyy can be found;
4) measurement of transverse restoring force: step 1) and step 2), the mounting base is fixedly connected with the interface base on the sliding rod, the measuring counterweight module is fixedly connected with the interface base on the sliding rail, the scale DR2 of the rotating measuring pointer on the rotating measuring dial is recorded, the distance between the interface bases on the measuring sliding rail is LY, meanwhile, counterweights WX2 with equal mass are added on the unilateral measuring counterweight module and the self-reducing counterweight, and the scale DR3 of the rotating measuring pointer on the rotating measuring dial is recorded after the system is stabilized. The longitudinal restoring force coefficient Kxx can be solved;
5) vertical restoring force measurement: step 1) and step 2), the mounting base is fixedly connected with an interface base on the sliding rail, the measuring counterweight module is fixedly connected with the interface base on the sliding rod, or the mounting base is fixedly connected with the interface base on the sliding rod, and the measuring counterweight module is fixedly connected with the interface base on the sliding rail; meanwhile, balance weights WX3 with equal mass are added on the balance weight modules on the two sides and the self-reducing balance weight piece, and after the system is stabilized, scales LV2 of a measuring pointer are recorded, so that the longitudinal restoring force coefficient Kz can be obtained.
Although the embodiments of the present invention and the accompanying drawings are disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the invention and the appended claims, and therefore the scope of the invention is not limited to the disclosure of the embodiments and the accompanying drawings.
Claims (2)
1. A mechanical type multipurpose ship model restoring force measuring device comprises a multipurpose restoring force measuring rod, an auxiliary measuring frame and a measuring counterweight module, wherein the multipurpose restoring force measuring rod is connected with the auxiliary measuring frame and is provided with an angle measuring device and a vertical displacement measuring device and used for measuring restoring force or moment of a ship model in the directions of rolling, pitching and heaving; the auxiliary measuring frame is a set of multipurpose rod frame system and is used for carrying a measuring counterweight module, connecting a multipurpose restoring force measuring rod and fixedly connecting a ship model; the measuring counterweight module is a counterweight block for measuring and is fixedly arranged on the auxiliary measuring frame;
the multifunctional restoring force measuring rod comprises a fixed measuring rod, a sliding measuring rod, a buffer spring, a self-reducing weight plate, an external guide pulley, an internal pulley, a traction steel cable, a sliding unit sleeve, a vertical measuring pointer, a rotating measuring dial, a measuring rod mounting base, a sliding rod rotating shaft end and a fixed connecting base, wherein the upper end of the fixed measuring rod is welded with the fixed connecting base, and the lower end of the fixed measuring rod is welded with the sliding unit sleeve; the sliding measuring rod is connected with the measuring rod mounting base through a sliding rod rotating shaft end, and the sliding rod rotating shaft end can rotate around a hole position on the measuring rod mounting base; the rotation measuring pointer is fixedly arranged at the rotating shaft end of the sliding rod and can rotate along with the rotating shaft end of the sliding rod; the rotary measuring dial is fixedly arranged on the measuring rod mounting base; the sliding measuring rod can slide up and down along the pipe wall in the sliding unit sleeve, and a vertical measuring pointer is arranged at the rod end; the sliding unit sleeve is provided with a long-strip hole on the pipe wall and is marked with scales, a buffer spring is arranged inside the bottom end, an internal pulley is arranged at the axis of the top end, an external pulley is arranged at the end of an external boss, and the pulley is used for guiding and limiting a traction steel cable; the traction steel cable is connected with the end of the sliding measuring rod and the self-reducing counterweight plate;
the auxiliary measuring frame comprises a sliding rail, a sliding rod, a mounting base, a sliding rod locking device, an interface base locking device, a sliding rod measuring pointer and a base measuring pointer, wherein the sliding rail is welded with the mounting base, is locked and connected with the sliding rod through the sliding rod locking device, and is locked and connected with the interface base through the interface base locking device; the sliding rods can slide on the two sliding rails and are symmetrically arranged and locked with respect to the gravity center of the ship model along the ship length direction after being adjusted; the connector base and the connector base locking devices are 4 groups in total and can slide on the sliding rails and the sliding rods, wherein two groups of the connector base and the connector base locking devices are distributed on the sliding rails and symmetrically distributed and locked relative to the center of gravity of the ship model along the ship width direction, and the other two groups of the connector base and the connector base locking devices are distributed on the sliding rods and symmetrically distributed and locked relative to the center of gravity on the middle longitudinal line of the ship model; the sliding rod locking device is provided with a sliding rod measuring pointer, the interface base locking device on the sliding rail is provided with a base measuring pointer, and the sliding rail is provided with sliding rail scales;
the counterweight measuring module comprises a counterweight limiting column, a fastening nut, a counterweight measuring sheet, a counterweight module mounting base and a counterweight base, wherein the counterweight limiting column is used for limiting the displacement of the counterweight measuring sheet, and the fastening nut is used for fixedly mounting the counterweight measuring sheet; the measuring counterweight plate is arranged on the counterweight base; the counterweight module mounting base is mounted on the interface base.
2. A measuring method using the mechanical multipurpose ship model restoring force measuring device of claim 1, characterized in that: the method comprises the following steps:
1) preparation before experiment: moving a beam structure of a support frame or other frame bodies suitable for mounting the mechanical multipurpose ship model restoring force measuring device to a proper position of a water pool; adjusting 4 interface bases and locking and fixing the interface bases through an interface base locking device, wherein the interface bases on the sliding rail are positioned on a cross section where the gravity center is positioned, and the interface bases on the sliding rod are positioned on a middle longitudinal section where the gravity center is positioned and are symmetrically distributed about the gravity center; connecting the mounting bases of the two multi-purpose restoring force measuring rods with the interface bases on the sliding rails or the sliding rods respectively; the fixed connection bases of the two multi-purpose restoring force measuring rods are respectively locked and fixed with the beam structures of the support frame body or other frame bodies; connecting a counterweight module mounting base of the measurement counterweight module with an interface base on the slide rail or the slide rod, wherein the measurement counterweight module does not load a measurement counterweight sheet;
2) after the connection is finished, continuously loading the weight plate on the self-reducing weight plate in the multi-purpose restoring force measuring rod until the vertical measuring pointer can be stably maintained at the middle position of the scale mark on the sleeve of the sliding unit, and recording the weight WP0 of the scale LV0 and the self-reducing weight plate at the moment; after the ship model is placed in water, the four mounting bases of the auxiliary measuring frame are fixedly mounted on the ship model, wherein the mounting bases of the slide rails need to be symmetrical about the gravity center of the ship model along the width direction of the ship; recording the scale LV1 of the vertical measuring pointer;
3) longitudinal restoring force measurement: after the steps 1) and 2), fixedly connecting a measuring rod mounting base with an interface base on a sliding rail, fixedly connecting a measuring counterweight module with the interface base on the sliding rod, recording the scale DR0 of a rotating measuring pointer on a rotating measuring dial, recording the scales of the sliding rod measuring pointer and a base measuring pointer as LX0 and LO0 respectively, simultaneously adding counterweights WX1 with equal mass on a single-side measuring counterweight module and a self-reducing counterweight plate, recording the scale DR1 of the rotating measuring pointer on the rotating measuring dial after the system is stabilized, and then calculating the longitudinal restoring force coefficient;
4) measurement of transverse restoring force: after the steps 1) and 2), fixedly connecting a measuring rod mounting base with an interface base on a sliding rod, fixedly connecting a measuring counterweight module with the interface base on the sliding rail, recording the scale DR2 of a rotating measuring pointer on a rotating measuring dial, wherein the distance between the interface bases on the measuring sliding rail is LY, simultaneously adding counterweights WX2 with equal mass on a single-side measuring counterweight module and a self-reducing counterweight plate, recording the scale DR3 of the rotating measuring pointer on the rotating measuring dial after a system is stabilized, and then calculating the transverse restoring force coefficient;
5) vertical restoring force measurement: after the steps 1) and 2), the mounting base of the measuring rod is fixedly connected with the interface base on the sliding rail, the measuring counterweight module is fixedly connected with the interface base on the sliding rod, or the mounting base of the measuring rod is fixedly connected with the interface base on the sliding rod, and the measuring counterweight module is fixedly connected with the interface base on the sliding rail; meanwhile, balance weights WX3 with equal mass are added on the balance weight modules on the two sides and the self-reducing balance weight piece, and after the system is stabilized, the scale LV2 of the vertical measuring pointer is recorded, so that the vertical restoring force coefficient can be calculated.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910903724.XA CN110579334B (en) | 2019-09-24 | 2019-09-24 | Mechanical type multipurpose ship model restoring force measuring device and method |
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| CN201910903724.XA CN110579334B (en) | 2019-09-24 | 2019-09-24 | Mechanical type multipurpose ship model restoring force measuring device and method |
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| CN110579334A CN110579334A (en) | 2019-12-17 |
| CN110579334B true CN110579334B (en) | 2021-07-27 |
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