A dynamic disturbance force calibration mechanism and system for a vibration source

Abstract

The application provides a kind of dynamic disturbance force calibration mechanism and system of vibration source, the system includes calibration mechanism and adjusting mechanism, the calibration mechanism includes linear slide rail, first slider, counterweight, fixed frame, force sensor and impact head.In use, first by adjusting mechanism makes the impact head of calibration mechanism perpendicular to the face where calibration point is located, and ensures that the contact body of impact head is aligned with calibration point, so that impact head provides single pulse to measurement platform or vibration source.The calibration system designed by the present application can effectively reduce the error caused by inaccurate human knocking calibration point, and improve the accuracy when measuring dynamic disturbance force.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sensor dynamic calibration, in particular to a dynamic disturbance force calibration mechanism and system of a vibration source. BACKGROUND

[0002] With the continuous advancement of deep space exploration, the performance requirements of resolution, stability and pointing of large space telescopes and the like are also increasingly high, and even a slight vibration will greatly interfere with the accuracy of these precision equipment, so it is necessary to evaluate the influence of the force generated by the vibration source on the large telescope on the ground. In addition, the moving parts on the spacecraft become larger, for example, the mass of the control moment gyro (CMG) in the Chinese large telescope is 90 kg, and 6 CMGs are usually used as a group. After adding the installation equipment, the ground force measuring device generally needs to support a load of more than 1 ton for micro-vibration ground test, and the diameter of each functional module is close to 2 meters, which also requires a larger installation plane for fixing and measuring.

[0003] Based on the above considerations, a high-stiffness, large-size, high-precision measuring platform is needed to measure the disturbance force of the vibration source on the ground. However, the measuring platform of the prior art does not install the vibration source during dynamic calibration, and the force is input by hand-held force hammer knocking. Since the mass, center of mass, installation method and environmental interference of the measured vibration source are unknown, the transfer function of the platform is not fixed during each measurement. Dynamic calibration without installing the vibration source causes a certain error between the calibration matrix and the actual value. In addition, the force error input by hand-held force hammer knocking is large, on the one hand, the knocking force cannot be exactly on the calibration point, and on the other hand, the knocking force cannot be guaranteed to be perpendicular to the face where the calibration point is located, so that unwanted forces or torques are introduced in other directions. These factors will reduce the measurement accuracy of the measuring platform.

[0004] Therefore, it is necessary to design a dynamic disturbance force calibration mechanism of a vibration source, so that the input force can be accurately applied to the calibration point perpendicular to the face where the calibration point is located during calibration, and the phenomenon of repeated knocking can be avoided. It is necessary to improve the measurement accuracy of the calibration process of the measuring platform. SUMMARY

[0005] In order to overcome the defects in the prior art, the present application provides a dynamic disturbance force calibration mechanism and system of a vibration source, which can accurately input force to the calibration point perpendicular to the face where the calibration point is located, and can realize single pulse knocking, thereby greatly reducing the error generated by the measuring platform during calibration, improving the measurement accuracy of the platform, and can be applied to dynamic calibration of high-precision disturbance force measuring platform.

[0006] To achieve the above purpose, the present application provides the following specific technical solutions:

[0007] The application discloses a dynamic calibration mechanism for a vibration force of a vibration source.

[0008] The first sliding block is arranged on the linear sliding rail and can slide relative to the linear sliding rail.

[0009] The counterweight is fixedly connected to the first sliding block, and two first fixing members are symmetrically arranged on two side surfaces of the counterweight which are perpendicular to the sliding direction of the first sliding block.

[0010] The measuring head is arranged at the front end of the counterweight and comprises a force sensor and a striking head, the force sensor is arranged between the front end of the counterweight and the striking head, and a contact body for hammering a calibration point is arranged on the striking head.

[0011] The fixed frame is sleeved on the linear sliding rail, the bottom surface of the fixed frame is fixed relative to the linear sliding rail, two second fixing members are symmetrically arranged on the two side surfaces of the fixed frame, and an elastic rope is arranged between the second fixing member on one side and the first fixing member.

[0012] Further, a mounting groove is arranged on the counterweight, a soft magnet is arranged in the mounting groove, a top surface of the fixed frame is further provided with an electromagnet, the electromagnet is electrified when the contact body hammers the calibration point, and the soft magnet and the electromagnet are attracted to each other when the counterweight passes the position of the electromagnet.

[0013] Further, the fixed frame is in a polygonal shape, reinforcing ribs are arranged at the corner positions of the polygon, and the reinforcing ribs abut against the inner wall of the fixed frame.

[0014] Further, the force sensor and the striking head are in detachable connection, and the contact body on the striking head is made of metal or PVC.

[0015] Further, the striking head further comprises a stud and a body, the stud is in threaded connection with the force sensor, the contact body and the stud are arranged on the two sides of the body along the axial direction, the cross section of the body is in a regular hexagonal shape, and the contact body is in a hemispherical shape.

[0016] In a second aspect, the present application also provides a dynamic disturbance force calibration system of a vibration source, comprising a calibration mechanism and an adjusting mechanism, wherein the calibration mechanism is the calibration mechanism of the first aspect of the present application; the adjusting mechanism comprises a lifting slide rail, a second slide block, a connecting rod, a rotating rod and a locking mechanism; the second slide block is arranged on the lifting slide rail and can slide up and down relative to the lifting slide rail; the connecting rod is arranged horizontally and is fixedly connected with the second slide block; the rotating rod is hingedly connected with the connecting rod and can be arranged in a horizontal position or a vertical position; the rotating rod is fixedly connected with the straight slide rail of the calibration mechanism;

[0017] The locking mechanism can be placed in a first locking position, a second locking position and an unlocking position; when the locking mechanism is placed in the first locking position, the rotating rod is locked in the horizontal position; when the locking mechanism is placed in the second locking position, the rotating rod is locked in the vertical position; when the locking mechanism is placed in the unlocking position, the rotating rod can be rotated to another position different from the horizontal position and the vertical position.

[0018] Further, the connecting rod is provided with a first limiting hole and a second limiting hole, the rotating rod is provided with a third limiting hole, and the locking mechanism comprises a first locking structure;

[0019] The first locking structure is arranged at the position of the third limiting hole and has a limiting part;

[0020] When the locking mechanism is placed in the first locking position, the limiting part protrudes out of the third limiting hole and enters the first limiting hole, so that the rotating rod is relatively fixed with the connecting rod;

[0021] When the locking mechanism is placed in the second locking position, the limiting part protrudes out of the third limiting hole and enters the second limiting hole, so that the rotating rod is relatively fixed with the connecting rod;

[0022] When the locking mechanism is placed in the unlocking position, the limiting part is placed in the third limiting hole, so that the rotating rod can rotate relative to the connecting rod.

[0023] Further, the connecting rod is provided with a first through hole, the rotating rod is provided with a second through hole and a third through hole, the first through hole and the second through hole are rotatably connected through a hinge, and the locking mechanism comprises a sliding groove and a spring latch; the sliding groove is provided with a first positioning hole and a second positioning hole at two ends thereof; the spring latch is arranged at the position of the third limiting hole; when the rotating rod is in the horizontal position, the spring latch is inserted into the first positioning hole; when the rotating rod is in the vertical position, the spring latch is inserted into the second positioning hole.

[0024] Further, the system further comprises a base and a vibration isolation platform; the lifting slide rail is arranged on the base; the base is detachably locked on the vibration isolation platform.

[0025] Further, the system further comprises a measurement platform for placing a vibration source, the measurement platform being provided with at least one calibration point; the calibration point is located on a table surface of the measurement platform or the vibration source.

[0026] The present application can achieve the following technical effects:

[0027] The present application provides a calibration mechanism and system for dynamic disturbance force of a vibration source, the system comprising a calibration mechanism and an adjusting mechanism, the calibration mechanism comprising a linear slide rail, a first sliding block, a counterweight, a fixed frame, a force sensor and a hammer head. In use, the adjusting mechanism is used to make the hammer head of the calibration mechanism perpendicular to the surface where the calibration point is located, and to ensure that the contact body of the hammer head is aligned with the calibration point, so that the hammer head provides a single pulse to the measurement platform or the vibration source. The calibration system designed in the present application can effectively reduce the error caused by inaccurate human knocking on the calibration point, and improve the accuracy of measuring dynamic disturbance force. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is an exploded structural schematic view of the calibration system involved in an embodiment of the present application;

[0029] Figure 2 is a schematic view of hammering a calibration point in a vertical surface of the calibration system involved in an embodiment of the present application;

[0030] Figure 3 is a schematic view of hammering a calibration point in a horizontal surface of the calibration system involved in an embodiment of the present application;

[0031] Figure 4 is a schematic view of a calibration process of the calibration system involved in an embodiment of the present application;

[0032] Figure 5 is a schematic view of a calibration process of the calibration system involved in an embodiment of the present application;

[0033] Figure 6 is a schematic view of a calibration process of the calibration system involved in an embodiment of the present application;

[0034] Figure 7 is a structural schematic view of a connecting rod involved in an embodiment of the present application;

[0035] Figure 8 is a structural schematic view of a rotating rod involved in an embodiment of the present application;

[0036] Figure 9a is a structural schematic view of a counterweight involved in an embodiment of the present application;

[0037] Figure 9b is a sectional view of a counterweight structure according to an embodiment of the present application;

[0038] Figure 10 is a structural schematic view of an impact head according to an embodiment of the present application;

[0039] Figure 11 is a structural schematic view of a fixed frame according to an embodiment of the present application;

[0040] Figure 12 is a flowchart of a calibration method according to an embodiment of the present application;

[0041] Figure 13 is a flowchart of a calibration method according to another embodiment of the present application.

[0042] Reference Signs:

[0043] 1. adjustment mechanism

[0044] 11. base

[0045] 12. lifting slide rail

[0046] 13. second sliding block

[0047] 14. locking hand wheel

[0048] 15. lifting adjustment hand wheel

[0049] 16. connecting rod

[0050] 161. connecting groove

[0051] 162. first counterbore

[0052] 163. first through hole

[0053] 164. first limiting surface

[0054] 165. second limiting surface

[0055] 166. sliding slot

[0056] 167. positioning hole

[0057] 17. spring latch

[0058] 18. rotating rod

[0059] 181. second through hole

[0060] 182. third through hole

[0061] 183. upper plane

[0062] 184、lower plane;

[0063] 185、first threaded hole;

[0064] 2、calibration mechanism;

[0065] 21、linear slide rail;

[0066] 22、first slider;

[0067] 23、counterweight;

[0068] 231、mounting groove;

[0069] 232、second counterbore;

[0070] 233、second threaded hole;

[0071] 234、third counterbore;

[0072] 24、force sensor;

[0073] 25、impact head;

[0074] 251、stud;

[0075] 252、body;

[0076] 253、contact body;

[0077] 26、fixed frame;

[0078] 261、third threaded hole;

[0079] 262、fourth threaded hole;

[0080] 263、fourth through hole;

[0081] 264、reinforcing rib;

[0082] 27、electromagnet;

[0083] 28、second fixing member;

[0084] 29、elastic cord;

[0085] 210、soft magnet;

[0086] 3、measurement platform;

[0087] 4、vibration source. DETAILED DESCRIPTION

[0088] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and do not constitute limitation to the present application.

[0089] As shown in the first aspect, the present application provides a dynamic disturbance force calibration mechanism 2 of a vibration source, comprising a linear slide rail 21, a first slide block 22, a counterweight 23, a measuring head and a fixed frame 26. Figures 1 to 11 The first slide block 22 is arranged on the linear slide rail 21 and can slide relative to the linear slide rail 21.

[0090] The counterweight 23 is fixedly connected to the first slide block 22, and two first fixing members are symmetrically arranged on two sides of the counterweight 23 which are perpendicular to the sliding direction of the first slide block 22.

[0091] The measuring head is arranged at the front end of the counterweight 23 and comprises a force sensor 24 and an impact head 25, the force sensor 24 is arranged between the front end of the counterweight 23 and the impact head 25, and a contact body 253 for hammering a calibration point is arranged on the impact head 25.

[0092] The fixed frame 26 is sleeved on the linear slide rail 21, the bottom surface of the fixed frame 26 is fixed relative to the linear slide rail 21, two second fixing members 28 are symmetrically arranged on the two side surfaces of the fixed frame 26, and an elastic rope 29 is arranged between the second fixing member 28 on the same side and the first fixing member.

[0093] In the embodiment, the linear slide rail and the first slide block are configured to have as small friction therebetween as possible, so as to reduce the energy consumption when the calibration mechanism works.

[0094] The counterweight 23 mainly plays a role of storing energy, and enough energy can be transmitted to the measuring platform when the calibration mechanism hammers the calibration point.

[0095] Figure 9a As shown in the first aspect, the present application provides a dynamic disturbance force calibration mechanism 2 of a vibration source, comprising a linear slide rail 21, a first slide block 22, a counterweight 23, a measuring head and a fixed frame 26. Figure 9b The second counterbore 232 of the counterweight 23 is matched with the threaded hole of the first slide block 22 and is fixedly connected through a bolt, the third counterbore 234 is matched with the threaded hole on the force sensor 24 and is fixedly connected through a bolt, and the first fixing member (not shown in the figure) is fixed on the counterweight 23 through cooperation with the second threaded hole 233. The first fixing member and the second fixing member are preferably lifting ring screws. When the first slide block moves on the linear slide rail and the two lifting ring screws on the same side are closest, there is no tensile stress on the elastic rope.

[0096] In the embodiment, the counterweight 23 is provided with a mounting groove 231, and a soft magnet 210 is arranged in the mounting groove 231; the top surface of the fixed frame 26 is further provided with an electromagnet 27; the electromagnet 27 is energized when the contact body 253 hammers the calibration point; and the soft magnet 210 and the electromagnet 27 are attracted to each other when the counterweight 23 passes the position of the electromagnet 27.​

[0097] In the embodiment, the fixing frame 26 is polygonal in shape, and reinforcing ribs 264 are arranged at the corners of each polygon; the reinforcing ribs 264 abut against the inner wall of the fixing frame 26. The reinforcing ribs 264 are used to strengthen the fixing frame and prevent it from being deformed under force.

[0098] The fixing frame 26 is connected to the two counterbores of the linear slide rail 21 through the two third threaded holes 261 and is fixed by bolts, the two fourth threaded holes 262 of the fixing frame 26 are used to install two lifting ring screws (i.e., second fixing members), and the fourth through hole 263 of the top surface of the fixing frame 26 is connected to the threaded hole of the electromagnet 27 through a bolt.

[0099] In some embodiments, the force sensor 24 and the impact head 25 are connected in a detachable manner, and the contact body 253 of the impact head 25 is made of metal or PVC. The impact head 25 further includes a stud 251 and a body 252; the stud 251 is threadedly connected to the force sensor 24; the contact body 253 is arranged on both sides of the body 252 along the axial direction of the stud 251, the cross-sectional shape of the body 252 is a regular hexagon, and the shape of the contact body 253 is hemispherical. The body 252 of the impact head 25 is shaped as a regular hexagon, which conforms to ergonomics and facilitates disassembly and installation.

[0100] The contact body 253 can be made of different materials according to different frequency response ranges. The softer the material of the contact body 253, the narrower the frequency response bandwidth, and the more concentrated the energy in the low-frequency region during hammering, which is suitable for structures with a resonant frequency concentrated in the low-frequency region. The frequency response bandwidth of the metal contact body is the widest, and it is suitable for structures with a resonant frequency in a higher frequency range. In this application, the contact body 253 made of PVC is preferably used for hammering.

[0101] In a second aspect, the present application further provides a dynamic disturbance force calibration system of a vibration source, which comprises a calibration mechanism 2 and an adjustment mechanism 1, the calibration mechanism 2 being the calibration mechanism according to the first aspect of the present application; the adjustment mechanism 1 comprises a lifting slide rail 12, a second sliding block 13, a connecting rod 16, a rotating rod 18, and a locking mechanism; the second sliding block 13 is arranged on the lifting slide rail 12 and can slide up and down relative to the lifting slide rail 12; the connecting rod 16 is horizontally arranged and fixedly connected to the second sliding block 13; the rotating rod 18 is hingedly connected to the connecting rod 16 and can be arranged in a horizontal position or a vertical position; the rotating rod 18 is fixedly connected to the linear slide rail 21 of the calibration mechanism 2;

[0102] The locking mechanism can be placed in a first locking position, a second locking position and an unlocking position. When the locking mechanism is placed in the first locking position, the rotating rod 18 is locked in the horizontal position. When the locking mechanism is placed in the second locking position, the rotating rod 18 is locked in the vertical position. When the locking mechanism is placed in the unlocking position, the rotating rod 18 can be rotated to another position different from the horizontal position and the vertical position.

[0103] Preferably, the connecting rod is provided with a first limiting hole and a second limiting hole, the rotating rod is provided with a third limiting hole, and the locking mechanism comprises a first locking structure. The first locking structure is arranged in the third limiting hole and has a limiting part. When the locking mechanism is placed in the first locking position, the limiting part extends out of the third limiting hole and enters the first limiting hole, so that the rotating rod is relatively fixed with the connecting rod. When the locking mechanism is placed in the second locking position, the limiting part extends out of the third limiting hole and enters the second limiting hole, so that the rotating rod is relatively fixed with the connecting rod. When the locking mechanism is placed in the unlocking position, the limiting part is placed in the third limiting hole, so that the rotating rod can be rotated relative to the connecting rod. In this way, through the design of the limiting part, the fixation of the rotating rod in the horizontal position and the vertical position can be automatically realized, which facilitates the hammering of the calibration point position.

[0104] In some embodiments, the connecting rod 16 is provided with a connecting groove 161 and a first counterbore 162. The connecting groove 161 cooperates with the boss on the second sliding block 13, and the first counterbore 162 is locked with the second sliding block 13 by a bolt, so as to realize the mutual fixation of the connecting rod 16 and the second sliding block 13. The connecting rod 13 is provided with a first through hole 163, the rotating rod is provided with a second through hole 181 and a third through hole 182, the first through hole 163 and the second through hole 181 are rotatably connected by a hinge (such as a bolt and a nut), and the locking mechanism comprises a sliding groove 166 and a spring latch 17. The sliding groove 166 is provided with a first positioning hole (not shown in the figure) and a second positioning hole 167 at both ends. The spring latch 17 is arranged at the position of the third through hole 182. When the rotating rod 18 is in the horizontal position, the spring latch 17 is automatically inserted into the first positioning hole (not shown in the figure) under the action of the elastic force. Then the spring latch 17 can be pulled out and the rotating rod is counterclockwise rotated. At this time, the spring latch slides along the sliding groove until the second positioning hole position, the spring latch 17 is inserted into the second positioning hole 167, and the rotating rod 18 is in the vertical position.

[0105] In some embodiments, the connecting rod 16 further has a first limiting surface 164 and a second limiting surface 165, the included angle of the first limiting surface 164 and the second limiting surface 165 is 90°, the first limiting surface 164 and the second limiting surface 165 can limit the rotation angle of the rotating rod 18, when the upper surface 183 of the rotating rod 18 contacts the first limiting surface 164, the rotating rod 18 is in a horizontal position (i.e. horizontal position); when the lower surface 184 of the rotating rod 18 contacts the second limiting surface 165, the rotating rod 18 is in a vertical position (i.e. vertical position).

[0106] In some embodiments, the rotating rod 18 is further provided with a first threaded hole 185, the first threaded hole 185 is used for installing a calibration mechanism, the counterbore on the linear slide rail 21 in the calibration mechanism 2 cooperates with the first threaded hole 185 and is fixedly connected by a bolt.

[0107] In some embodiments, the adjusting mechanism 1 further comprises a locking hand wheel 14 and a lifting adjusting hand wheel 15, the second sliding block 13 can slide up and down on the lifting slide rail 12 under the rotation of the lifting adjusting hand wheel 15; when the second sliding block 13 is positioned to the required height, the fixation of the second sliding block 13 on the lifting slide rail 12 can be realized by rotating the locking hand wheel 14.

[0108] In some embodiments, the system further comprises a base 11 and a vibration isolation table; the lifting slide rail is arranged on the base 11; the base can be detachably fixed on the vibration isolation table. The base 11 can be fixed on the vibration isolation table by bolt fastening, or can be fixed on the vibration isolation table in any position by magnetic attraction.

[0109] In some embodiments, the system further comprises a measurement platform 3, the measurement platform 3 is used for placing a vibration source 4, the measurement platform 3 has at least one calibration point; the calibration point is located on the table surface of the measurement platform 3 or the vibration source 4.

[0110] As shown in Figure 12 In a third aspect, the present application provides a calibration method of dynamic disturbance force of a vibration source, comprising the following steps:

[0111] S1: installing a to-be-measured vibration source on a measurement platform, taking the center position of the base of the vibration source as the coordinate origin to establish a coordinate system; a plurality of to-be-measured calibration points are arranged on the measurement platform;

[0112] S2: selecting a plurality of to-be-measured calibration points, measuring the spatial coordinates of the selected plurality of to-be-measured calibration points;

[0113] S3: using a calibration system to sequentially input pulse force to the plurality of to-be-measured calibration points, recording the input signal of the force sensor of the calibration system and the output voltage signal of the measurement platform;

[0114] S4: converting the pulse force input by the calibration system for the several to-be-measured calibration points into force relative to the coordinate origin respectively, and calculating a calibration matrix according to the force relative to the coordinate origin after conversion and the output voltage of the measurement platform;

[0115] S5: calculating the dynamic disturbance force of the vibration source according to the calibration matrix and the output voltage of the measurement platform.

[0116] In the embodiment, the vibration source can be a momentum wheel. Since the measurement platform mainly measures the dynamic disturbance force, the calibration and measurement can be analyzed based on the frequency domain. After the vibration source (momentum wheel) to be measured is installed on the disturbance force measurement platform, a coordinate system can be established with the center of the momentum wheel base as the origin O for subsequent calculation.

[0117] In the embodiment, the spatial coordinates of the to-be-measured calibration points can be measured by a portable measurement arm.

[0118] Preferably, the measurement platform has 6 output channels, and the output voltage of the measurement platform is represented by V i The dynamic disturbance force of the vibration source in step S5 is calculated in the following manner:

[0119] F(ω) = D(ω)V(ω);

[0120] wherein F(ω) = [F x (ω) F y (ω) F z (ω) M x (ω) M y (ω) M z (ω)] -1 represent the vibration source disturbance force in 6 directions of the vibration source;

[0121] V(ω) = [V1(ω) V2(ω) V3(ω) V4(ω) V5(ω) V6(ω)] -1 , and D(ω) is a 6x6 calibration matrix.

[0122] Preferably, the conversion of the pulse force input by the calibration system for the several to-be-measured calibration points into force relative to the coordinate origin is calculated according to the following formula:

[0123] F c (ω) = C F c-b (ω);

[0124] wherein F c-b (ω) represents the pulse force input by the to-be-measured calibration point, and F c(ω) represents the converted force relative to the coordinate origin, and C is a transformation matrix of the force. In actual use, a portable measuring arm can be used to measure the spatial coordinates of each to-be-calibrated point, and the transformation matrix C can be obtained.

[0125] “calculating the calibration matrix according to the converted force relative to the coordinate origin and the output voltage of the measuring platform” includes:

[0126] D(ω)=F c (ω)V c (ω) -1 ;

[0127] wherein F c (ω)=[F c-1 (ω) F c-2 (ω) F c-3 (ω) F c-4 (ω) F c-5 (ω) F c-6 (ω)] -1 ;

[0128] F c-i (ω)=[F x-c-i (ω) F y-c-i (ω) F z-c-i (ω) M x-c-i (ω) M y-c-i (ω) M z-c-i (ω)]

[0129] wherein Vc(ω) is a 6*6 output voltage matrix of the measuring platform, wherein Vc-ij(ω) is the output voltage of the jth output channel when the ith calibration input force is input, and M represents the moment, x, y and z respectively represent three mutually perpendicular directions in space, c is the abbreviation of English calibration, indicating calibration, and i=1, 2, 3, 4, 5, 6.

[0130] In actual application, it is necessary to ensure that the input force of the six to-be-calibrated points is converted to the six-dimensional force F c (t) at the origin, which can cover the force and moment F x (ω), F y (ω), F z (ω), M x (ω), M y (ω) and M z (ω) in three directions, and F c-i (ω) contains as few forces in the direction as possible, so that the coupling between the dimensions during calibration is small, and the calibration accuracy is higher.

[0131] In some embodiments, as shown in Figure 13 , step S3 includes:

[0132] S31: rotating the lifting adjusting handle of the adjusting mechanism to adjust the height of the impact head, and rotating the rotating rod to adjust the direction of the impact head, so that the hammering direction of the impact head is perpendicular to the plane where the to-be-measured calibration points are located and is aligned with the to-be-measured calibration point;

[0133] S32: controlling the counterweight to drag in the opposite direction of the calibration point, and releasing the counterweight to accelerate the counterweight to the measurement platform or the vibration source under the elastic force of the elastic rope;

[0134] S33: when the impact head hammers a to-be-measured calibration point, the rising edge of the pulse on the force sensor is acquired, and the electromagnet is energized; when the soft magnet moves below the electromagnet and stops moving under the attraction force, it is considered that the impact head completes a hammering on the measurement platform or the vibration source.

[0135] S34: recording the output voltage signals of the force sensor and the measurement platform corresponding to all to-be-measured calibration points.

[0136] In other embodiments, the energization of the electromagnet in step S33 can also be realized by the following manner: an acceleration or position sensor is installed near the to-be-calibrated point, when the impact head hammers the to-be-calibrated point, the sensor captures the signal, and the electromagnet is energized.

[0137] In the embodiment, after the impact head hammers the to-be-calibrated point, the counterweight moves in the opposite direction corresponding to the hammering direction due to the combined action of the reaction force of the impact and the restoring force of the elastic rope. When the counterweight passes through the electromagnet, the soft magnet (such as an iron block) in the counterweight installation slot and the electromagnet on the top surface of the fixed frame stop moving under the attraction force, and thus the impact head completes a hammering on the measurement platform or the vibration source.

[0138] Further, step S3 further includes:

[0139] S35: hammering each to-be-measured calibration point multiple times (preferably three times), taking the average of the measurement values of the force sensor in the process of hammering the to-be-measured calibration point multiple times as the input signal corresponding to the to-be-calibrated point, and taking the average of the output signals of the to-be-measured calibration point in the process of hammering multiple times as the output signal of the measurement platform corresponding to the to-be-measured calibration point.

[0140] In a fourth aspect, the present application also provides a storage medium which stores a computer program, and the computer program is executed to realize the method in the third aspect of the present application.

[0141] In a fifth aspect, the present application further provides an electronic device comprising a storage medium and a processor; the storage medium is the storage medium according to the fourth aspect of the present application; the processor is electrically connected with the storage medium, and is used for executing a computer program stored in the storage medium to realize the method according to the third aspect of the present application.

[0142] In the embodiment, the electronic device is a computer device, including but not limited to: a personal computer, a server, a general-purpose computer, a special-purpose computer, a network device, an embedded device, a programmable device, a smart mobile terminal, a smart home device, a wearable smart device, a vehicle-mounted smart device, etc. The storage medium includes but is not limited to: a RAM, a ROM, a magnetic disk, a magnetic tape, an optical disk, a flash memory, a U disk, a mobile hard disk, a memory card, a memory stick, a network server storage, a network cloud storage, etc. The processor includes but is not limited to: a CPU (central processing unit), a GPU (graphics processing unit), an MCU (microprocessor), etc.

[0143] The present application provides a calibration mechanism, system and method of dynamic disturbance force of a vibration source. The adjustment mechanism in the calibration system can make the impact head perpendicular to the surface where the calibration point is located, and ensure that the impact head of the calibration mechanism is accurately positioned at the calibration point, ensuring that the impact head provides a single pulse to the measurement platform or the vibration source. The calibration method specifies the dynamic calibration process of the measurement platform. The calibration is performed on the basis of installing the vibration source, and each calibration point is calibrated three times for averaging to reduce the influence of environmental random noise. The calibration mechanism, system and method of the present application can introduce smaller errors during calibration, thereby improving the accuracy of platform measurement of dynamic disturbance force.

[0144] The above embodiments are not limited to the technical solutions of the embodiments themselves, and the embodiments can be combined with each other to form new embodiments. The above embodiments are only used to illustrate the technical solutions of the present application and not to limit them, and any modification or equivalent replacement within the spirit and scope of the present application should be covered in the scope of the technical solutions of the present application.

Claims

1. A mechanism for calibrating dynamic disturbance forces of a vibration source, characterized by, The calibration mechanism comprises: a linear slide rail; a first slider arranged on the linear slide rail and capable of sliding relative to the linear slide rail; a counterweight fixedly connected to the first slider, the counterweight being symmetrically provided with two first fixing members on two side surfaces opposite to the sliding direction of the first slider; a measuring head arranged at the front end of the counterweight, the measuring head comprising a force sensor and a striking head, the force sensor being arranged between the front end of the counterweight and the striking head, and the striking head being provided with a contact body for hammering a calibration point; a fixed frame sleeved on the linear slide rail, the bottom surface of the fixed frame being fixed relative to the linear slide rail, and the two side surfaces of the fixed frame being symmetrically provided with two second fixing members, the second fixing members on the same side being arranged between the first fixing members and the elastic ropes.

2. The calibration mechanism of the dynamic disturbing force of a vibration source according to claim 1, wherein: the counterweight is provided with a mounting groove, and a soft magnet is arranged in the mounting groove; and the top surface of the fixed frame is further provided with an electromagnet; 3. The mechanism for calibrating the dynamic disturbance force of a vibration source according to claim 1, wherein, when the contact body hammers the calibration point, the electromagnet is energized; and 4. The mechanism for calibrating the dynamic disturbance force of a vibration source according to claim 1, wherein, when the counterweight passes the position of the electromagnet, the soft magnet and the electromagnet are attracted to each other.

5. The mechanism for calibrating the dynamic disturbance force of a vibration source according to claim 1, wherein, The fixed frame is in the shape of a polygon, and a reinforcing rib is arranged at each corner of the polygon; and the reinforcing rib abuts against the inner wall of the fixed frame. The connection between the force sensor and the striking head is detachable, and the contact body on the striking head is made of metal or PVC. The striking head further comprises:

6. A calibration system for the dynamic disturbance force of a vibration source, characterized in that, a stud threadedly connected to the force sensor; a body, the contact body and the stud being arranged on two sides of the body along an axial direction, and the cross-sectional shape of the body being a regular hexagon; the contact body is in the shape of a hemisphere. The calibration mechanism comprises: a calibration mechanism according to any one of claims 1 to 5; an adjustment mechanism, the adjustment mechanism comprising: a lifting slide rail; a second slider arranged on the lifting slide rail and capable of sliding up and down relative to the lifting slide rail; 7. The system for calibrating the dynamic disturbance forces of a vibration source of claim 6, wherein, a connecting rod arranged horizontally and fixedly connected to the second slider; a rotating rod hingedly connected to the connecting rod and rotatably arranged in a horizontal position or a vertical position, the rotating rod being fixedly connected to the linear slide rail of the calibration mechanism; a locking mechanism capable of being placed in a first locking position, a second locking position and an unlocking position, the locking mechanism being used for locking the rotating rod in the horizontal position when the locking mechanism is placed in the first locking position, the locking mechanism being used for locking the rotating rod in the vertical position when the locking mechanism is placed in the second locking position, and the rotating rod being rotatable to another position different from the horizontal position and the vertical position when the locking mechanism is placed in the unlocking position. the connecting rod is provided with a first through hole, the rotating rod is provided with a second through hole and a third through hole, the first through hole and the second through hole are rotatably connected through a hinge, and the locking mechanism comprises: a sliding groove, the two ends of the sliding groove being provided with a first positioning hole and a second positioning hole. A spring latch is arranged at the third through hole position; when the rotating rod is in the horizontal position, the spring latch is inserted into the first positioning hole; when the rotating rod is in the vertical position, the spring latch is inserted into the second positioning hole.

8. The system for calibrating the dynamic disturbance force of a vibration source of claim 6, wherein, The system further comprises: A base, and the lifting slide rail is arranged on the base; A vibration isolation table, and the base is detachably locked on the vibration isolation table.

9. The system for calibrating the dynamic disturbance force of a vibration source of claim 6, wherein, The system further comprises: A measurement platform, and the measurement platform is used for placing a vibration source, and the measurement platform has at least one calibration point; the calibration point is located on a table top of the measurement platform or the vibration source.

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