CN206818431U - Two-freedom cyclic load analogue means under a kind of Elevated Gravity - Google Patents

Abstract

The utility model discloses a device for simulating two-degree-of-freedom cyclic loads in a supergravity environment. It includes two horizontal adjustment supports with the same structure, a device base, an X-direction transmission mechanism, a Y-direction transmission mechanism, a support member of the Y-direction transmission mechanism, a loading member and a wire dragging slide bar assembly. The utility model can realize the test assembly under complex conditions by adjusting the left and right and up and down positions of the horizontal support during installation; through feedback control of the X-direction and Y-direction servo motors, it can perform force or displacement cyclic loading simulation, and can be simulated by a computer It is convenient to adjust the amplitude and frequency of the cycle; the structure of the wire slider can keep the wire free to pull in the supergravity environment; the X-direction limit switch can flexibly adjust the limit protection range; the structural characteristics of the loading head can effectively solve the problem of loading The problem of two-way mutual interference. In summary, the device has complete functions, convenient installation, safety and reliability, and can meet the simulation needs of complex loads in a supergravity environment.

Description

A two-degree-of-freedom cyclic load simulation device in a hypergravity environment

technical field

The utility model relates to a supergravity centrifugal simulation device, in particular to a two-degree-of-freedom cyclic load simulation device in a supergravity environment.

Background technique

The geotechnical centrifuge uses the centrifugal acceleration generated by high-speed rotation to simulate the acceleration of gravity. In the geotechnical centrifuge, the centrifugal acceleration of n times the acceleration of gravity can be generated, thereby forming a supergravity environment. Using this hypergravity environment, the prototype soil stress field can be reproduced in the model foundation. This simulation method is a very important test method in the geotechnical field.

The service environment of offshore structural foundations is very harsh. The long-term action of complex marine wind and wave cyclic loads causes cyclic cumulative deformation of the foundation and changes in bearing capacity. In extreme cases, the structural foundation may be damaged. Therefore, there is an urgent need to study the failure mechanism of marine structural foundations and key technologies for disaster control in complex marine environments. Multi-directional coupling loading devices such as vertical force, horizontal force and overturning moment are necessary instruments for studying foundation deformation, bearing capacity and long-term cycle effects of marine structures. The two-degree-of-freedom load simulation device under supergravity conditions is the basis for simulating the force, deformation, failure, failure and control of marine structure foundations under complex marine loads. Therefore, the development of a two-degree-of-freedom load simulation device in a hypergravity environment is of great significance for solving the problem of marine structure foundation catastrophe control.

At present, single-degree-of-freedom loading devices or simple-structured dual-degree-of-freedom loading devices are mostly used in high-gravity environments. In order to simulate complex marine loading conditions in high-gravity environments, it is necessary to design a set of X- and Y-direction simultaneous loading and cyclic Experimental mock-up for loading features.

Utility model content

The purpose of this utility model is to provide a two-degree-of-freedom cyclic load simulation device in a supergravity environment. According to different test requirements, it can automatically control the force or displacement in the X and Y directions, so that it can be loaded statically or cyclically to meet different complex requirements. Loading, especially the test simulation requirements for complex loading of marine structural foundations.

The technical scheme that the utility model adopts is:

The utility model includes two horizontal adjustment supports with the same structure, a device base, an X-direction transmission mechanism, a Y-direction transmission mechanism, a Y-direction transmission mechanism support member, a loading member and a wire dragging slide bar assembly; The beams are respectively installed on the respective horizontal adjustment supports, and the X-direction transmission mechanism is installed on the inner side of a long side beam of the device base. Located in the two long side beams of the base of the device, through the right-angled supports on both sides of the Y-direction transmission mechanism support member, they respectively form a moving pair with their respective X-direction linear guide rails, and the loading member is installed on the Y-direction ball wire of the Y-direction transmission mechanism. On the rod nut, the loading member can move along the ball screw in the Y direction, and the wire dragging slide bar assembly is installed on the outer side of the other long side beam of the device base, and is parallel to the other long side beam; the Y on the loading member The wires of the force sensor and the X-direction force sensor, the wires of the Y-direction servo motor on the Y-direction transmission mechanism are all fixed on the ring of the wire slide bar of the wire dragging slider assembly, and the pxi controller is connected with the X-direction transmission mechanism respectively. The X-direction servo motor, the Y-direction servo motor on the Y-direction transmission mechanism and the Y-direction force sensor on the loading member are connected with the X-direction force sensor.

The two horizontal adjustment supports with the same structure both include two pads and a crossbeam; the pads are respectively installed at the two ends below the crossbeam, and the outside of the crossbeam along the length direction is provided with a long chute.

The base of the device includes two long side beams, two short side beams and an X-direction motor support base; short side beams are respectively installed between the inner sides of the two ends of the two long side beams, and an X side beam is installed outside a short side beam toward the motor support.

The X-direction transmission mechanism includes an X-direction servo motor, an X-direction reducer, an X-direction ball screw, two X-direction bearing assemblies and two X-direction linear guide rails; the X-direction reducer is installed on the X-direction motor support base , the X-direction servo motor is connected with the X-direction reducer 4, and one end of the X-direction ball screw passes through an X-direction bearing assembly on a short side beam of the device base, and is connected with the X-direction reducer through a coupling, and the X-direction After the other end of the ball screw is matched with the nut on the supporting member of the Y-direction transmission mechanism, it is installed in another X-direction bearing assembly on the other short side beam of the device base.

The Y-direction transmission mechanism includes a Y-direction transmission mechanism support member, a Y-direction servo motor, a Y-direction reducer, a Y-direction bearing assembly and a Y-direction ball screw; the Y-direction reducer is installed on the top surface of the Y-direction transmission mechanism support member , the Y-direction servo motor is connected with the Y-direction reducer, one end of the Y-direction ball screw passes through a Y-direction bearing assembly and is connected with the Y-direction reducer, and the other end of the Y-direction ball screw is matched with the nut installed on the loading member , and installed in another Y bearing assembly.

The supporting member of the Y-direction transmission mechanism includes an upper top board, a lower bottom board, a back board, two side boards and two right-angle supports; the upper and lower ends between the two side boards are respectively connected with the upper top board and the lower bottom board, and the two There is a back plate behind each side plate, and the right-angle supports are respectively installed outside the respective side plates, respectively forming a moving pair with the respective X-direction linear guide rails.

The loading member includes a loading mechanism connector, an X-direction force sensor, a Y-direction force sensor, an X-direction loading head and a Y-direction loading head; the upper end of the loading mechanism connector is connected to the nut on the loading member, and the loading mechanism connector There is a Y-direction loading head chute at the lower end, one end of the X-direction force sensor is connected to the Y-direction loading head chute, the other end of the X-direction force sensor is connected to the X-direction loading head, and the X-direction loading head faces the side of the X-direction servo motor , the outward vertical end of the middle part of the loading mechanism connector has an X-direction loading head chute, one end of the Y-direction force sensor is connected to the Y-direction loading head chute, the other end of the Y-direction force sensor is connected to the Y-direction loading head, and the Y-direction force sensor is connected to the Y-direction loading head. Towards the loading head towards the bottom side of the two horizontal adjustment supports.

The wire dragging slider assembly includes two wire slider connecting blocks, an X-direction limit switch installation fixture and a wire slider; a wire slider is installed between the two wire slider connecting blocks, and a wire slider is installed on the wire slider. The X-direction limit switch installation fixture, the X-direction limit switch installation fixture has a long hole along the length direction, the wire slide rod is covered with multiple rings, the wires are fixed on the rings, and the rings are on the guide rod when the device moves Sliding freely on the top, so as to realize the movement traction of the wire.

The beneficial effect that the utility model has is:

The utility model can realize the test assembly under complex conditions by adjusting the left and right and up and down positions of the horizontal support during installation; through feedback control of the X-direction and Y-direction servo motors, it can perform force or displacement cyclic loading simulation, and can be simulated by a computer It is convenient to adjust the amplitude and frequency of the cycle; the structure of the wire slider can keep the wire free to pull in the supergravity environment; the X-direction limit switch can flexibly adjust the limit protection range; the structural characteristics of the loading head can effectively solve the problem of loading The problem of two-way mutual interference. In summary, the device has complete functions, convenient installation, safety and reliability, and can meet the simulation needs of complex loads in a hypergravity environment.

Description of drawings

Fig. 1 is the assembly diagram of the utility model.

Fig. 2 is a structural diagram of the horizontal adjustment support of the present invention.

Fig. 3 is a structural diagram of the device base of the present invention.

Fig. 4 is a diagram of the supporting member of the Y-direction transmission mechanism of the present invention.

Fig. 5 is a diagram of the loading member of the present invention.

Fig. 6 is a structural diagram of the wire dragging slider assembly of the present invention.

Fig. 7 is a working principle diagram of the utility model.

In the figure: 1. Horizontal adjustment support, 2. Device base, 3. X-direction servo motor, 4. X-direction reducer, 5. X-direction bearing assembly, 6. X-direction ball screw, 7. X-direction linear guide , 8, Y-direction transmission mechanism support member, 9, Y-direction servo motor, 10, Y-direction reducer, 11, Y-direction bearing assembly, 12, Y-direction ball screw, 13, wire drag slider assembly, 14, Loading member, 15, pad, 16, beam, 17, hoisting hole, 18, long side beam, 19, short side beam, 20, X-direction motor support seat, 21, lightening hole, 22, upper roof plate, 23, Lower bottom plate, 24, back plate, 25, side plate, 26, right-angle support, 27, loading mechanism connector, 28, X-direction loading head chute, 29, Y-direction force sensor, 30, Y-direction loading head, 31 , Y direction loading head chute, 32, X direction force sensor, 33, X direction loading head, 34, wire slide bar connection block, 35, X direction limit switch installation fixture, 36, wire slide bar.

detailed description

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

As shown in Fig. 1, Fig. 2 and Fig. 3, the utility model includes two horizontal adjustment supports 1 with the same structure, a device base 2, an X-direction transmission mechanism, a Y-direction transmission mechanism, a Y-direction transmission mechanism support member 8, a loading The component 14 and the wire drag the slide bar assembly 13; the short side beams 19 at both ends of the device base 2 are respectively installed on the respective horizontal adjustment supports 1, and the X-direction transmission mechanism is installed on the inner surface of a long side beam 18 of the device base 2 , the two long side beams 18 are respectively equipped with X-direction linear guide rails 7 along the length direction, and the Y-direction transmission mechanism is located in the two long side beams 18 of the device base 2, and is supported by right angles on both sides of the Y-direction transmission mechanism support member 8 Parts 26 constitute a moving pair with the respective X-direction linear guide rails 7, and the loading member 14 is installed on the Y-direction ball screw nut of the Y-direction transmission mechanism. The loading member 14 can move along the Y-direction ball screw 12, and the wire drags Slide bar assembly 13 is installed on the outer surface of another long side beam 18 of device base 2, and is parallel with another long side beam 18, and device base 2 side has a plurality of lightening holes 21 (have 5 in Fig. 1 weight-reducing hole); the wires of the Y-direction force sensor and the X-direction force sensor on the loading member 14, the wires of the Y-direction servo motor on the Y-direction transmission mechanism are all fixed on the wire slide bar of the wire dragging slide bar assembly 13. On the ring, the PXI controller is respectively connected to the X-direction servo motor of the X-direction transmission mechanism, the Y-direction servo motor on the Y-direction transmission mechanism, and the Y-direction force sensor and the X-direction force sensor on the loading member 14 .

As shown in Figure 1 and Figure 2, the two horizontal adjustment supports 1 with the same structure both include two pads 15 and a beam 16; The outside of direction has long chute, has two hoisting holes 17 on crossbeam 16 sides.

As shown in Figures 1 and 3, the device base 2 includes two long side beams 18, two short side beams 19 and an X-direction motor support seat 20; The short side beams 19 are equipped with an X-direction motor support seat 20 on the outside of a short side beam 19 .

As shown in Figure 1, the X-direction transmission mechanism includes an X-direction servo motor 3, an X-direction reducer 4, an X-direction ball screw 6, two X-direction bearing assemblies 5 and two X-direction linear guide rails 7; The reducer 4 is installed on the X-direction motor support base 20, the X-direction servo motor 3 is connected to the X-direction reducer 4, and one end of the X-direction ball screw 6 passes through an X-direction on the short side beam 19 of the device base 2. After the bearing assembly 5 is connected with the X-direction reducer 4 through a coupling, the other end of the X-direction ball screw 6 is matched with the nut on the support member 8 of the Y-direction transmission mechanism, and installed on the other short side of the device base 2 Another X direction bearing assembly 5 on the beam 19.

This series of structures is the main part of the X-direction cyclic load simulation. The X-direction servo motor 3 decelerates through the X-direction reducer 4 to increase the torque and then drives the X-direction ball screw 6 to move. The X-direction ball screw 6 converts the rotational motion into a straight line Movement, the real-time feedback control of X-direction force and displacement is realized through computer programs. In order to prevent the X-direction ball screw 6 from bearing the huge load generated by the vertical supergravity, the X-direction linear guide 7 is used to bear the vertical load. The X-direction bearing assembly 5 is used to support and position the X-direction ball screw 6 .

As shown in Figure 1, the Y-direction transmission mechanism includes a Y-direction transmission mechanism supporting member 8, a Y-direction servo motor 9, a Y-direction reducer 10, a Y-direction bearing assembly 11 and a Y-direction ball screw 12; The device 10 is installed on the top surface of the supporting member 8 of the Y-direction transmission mechanism, the Y-direction servo motor 9 is connected with the Y-direction reducer 10, and one end of the Y-direction ball screw 12 passes through a Y-direction bearing assembly 11 to connect with the Y-direction reducer 10 , the other end of the Y-direction ball screw 12 cooperates with the nut installed on the loading member 14 and is installed in another Y-direction bearing assembly 11 .

As shown in Figures 1 and 4, the Y-direction transmission mechanism supporting member 8 includes an upper top plate 22, a lower bottom plate 23, a back plate 24, two side plates 25 and two right-angle supports 26; two side plates 25 The upper and lower ends between them are respectively connected with the upper top plate 22 and the lower bottom plate 23, and the back plate 24 is installed behind the two side plates 25, and the right-angle supports 26 are respectively installed outside the respective side plates 25, and are respectively connected with the respective X-direction linear guide rails. 7 constitute the mobile pair.

The Y-direction transmission mechanism supporting member 8 is composed of the upper top plate 22 of the Y-direction transmission mechanism support member, the lower bottom plate 23 of the Y-direction transmission mechanism support member, the back plate 24 of the Y-direction transmission mechanism support member, and the side plate of the Y-direction transmission mechanism support member. 25 The four parts are connected by high-strength bolts. The right-angle support 26 is the key component connecting the Y-direction transmission mechanism and the X-direction transmission mechanism. accuracy.

As shown in Figures 1 and 5, the loading member 14 includes a loading mechanism connector 27, an X-direction force sensor 32, a Y-direction force sensor 29, an X-direction loading head 33 and a Y-direction loading head 30; the loading mechanism connector The upper end of 27 is connected with the nut on the loading member 14, the lower end of the loading mechanism connector 27 has a Y-direction loading head chute 31, one end of the X-direction force sensor 32 is connected with the Y-direction loading head chute 31, and the X-direction force sensor The other end of 32 is connected to the X-direction loading head 33, and the X-direction loading head 33 faces the X-direction servo motor 3 side, and the outward vertical end of the middle part of the loading mechanism connector 27 has an X-direction loading head chute 28, and the Y-direction force One end of the sensor 29 is connected to the Y-direction loading head chute 31 , the other end of the Y-direction force sensor 29 is connected to the Y-direction loading head 30 , and the Y-direction loading head 30 faces one side of the bottom surface of the two horizontal adjustment supports 1 .

The loading mechanism connector 27 is provided with an X-direction loading head movable chute 28 and a Y-direction loading head movable chute 31, respectively realizing the flexible adjustment of the positions of the Y-direction loading head 30 and the X-direction loading head 33, and loading the X-direction loading head 33 The end is in the shape of a knife edge, and it is in line or point contact with the object to be loaded. The loading end of the Y-direction loading head 30 is a hemispherical structure, which is in point contact with the object to be loaded. This structure effectively decouples mutual interference during two-way simultaneous loading. question.

As shown in Figure 1 and Figure 6, the wire dragging slider assembly 13 includes two wire slider connecting blocks 34, X-direction limit switch installation fixture 35 and wire slider 36; two wire slider connecting blocks The 34 rooms are equipped with wire slide bars 36, X-direction limit switch mounting fixtures 35 are housed above the wire slide bar 36, and the X-direction limit switch installation fixtures 35 have long holes along the length direction, and the wire slide bar 36 is covered with multiple Circular ring (circular ring is not drawn among Fig. 6), and wire is fixed on the circular ring, and when device moves, circular ring freely slides on guide rod, thereby the movement traction of the wire that realizes.

When the device moves, the circular ring slides freely on the guide rod, thereby realizing the motion traction of the wire. The X-direction limit switch installation fixture 35 is provided with a long hole, and a limit switch is housed in the long hole (the limit switch is not drawn in Fig. 6 ). position switch), so that the position of the limit switch can be adjusted and fixed, realizing the flexible adjustment function of the X-direction protection range.

Working principle of the utility model:

The working principle of the utility model is shown in Figure 7. All the simulation actions of the device are controlled by software, and the communication between the computer in the remote operation room and the PXI controller in the supergravity environment studio is established by optical fiber slip rings. The main function of the software in the computer is to display and store the real-time information of force and displacement of the two-degree-of-freedom cyclic load simulation device; while the main function of the software in the PXI controller is to receive and transmit information to the remote computer, and at the same time directly control the operation of the device . The core control method of this device is the PID feedback control algorithm. The core program to control this device is mainly located in the PXI control. The PXI controller is a real-time controller running under the Labview RT system. It feeds back the X, The Y-direction force and displacement signals are compared with the target movement of the given force and displacement in real time, and then output to the servo driver after a certain calculation, thus realizing the simulation of the bidirectional load of the device.

The device can simulate a variety of complex loads. For example, in static control, the program sends the control signals of X and Y direction forces or displacements input by the remote computer to the PXI controller. PXI control compares the given and measured forces or displacements in real time. Then perform PID calculation on their difference signals, and finally convert them into pulse signals of a certain frequency and quantity and output them to the X and Y direction servo drivers. The servo driver controls the servo motor to make rotational movement, and after passing through the reducer, it is converted into a straight line by the ball screw. Movement, the ball screw drives the loading member to move in the X and Y directions; during dynamic control, the X and Y directions input a sine wave signal with a certain amplitude and frequency to compare with the measured force or displacement signal, and then compare the difference signal Input to the PID operation function for calculation, and convert the calculation result into the pulse frequency and quantity required by the servo drive, and finally drive the device to perform X and Y circular reciprocating motions.

Claims (8)

1. A two-degree-of-freedom cyclic load simulation device under a supergravity environment is characterized in that: it includes two horizontal adjustment supports (1) with the same structure, a device base (2), an X-direction transmission mechanism, a Y-direction transmission mechanism, Y-direction transmission mechanism supporting member (8), loading member (14) and wire dragging slide bar assembly (13); the short side beams (19) at both ends of the device base (2) are respectively installed on the respective horizontal adjustment supports (1) On the upper side, the X-direction transmission mechanism is installed on the inner surface of a long side beam (18) of the device base (2). The transmission mechanism is located in the two long side beams (18) of the device base (2), through the right-angle supports (26) on both sides of the support member (8) of the Y-direction transmission mechanism, respectively connected with the respective X-direction linear guide rails (7 ) constitutes a moving pair, the loading member (14) is installed on the Y-direction ball screw nut of the Y-direction transmission mechanism, the loading member (14) can move along the Y-direction ball screw (12), and the wire drags the slide bar assembly (13 ) is installed on the outer surface of another long side beam (18) of the device base (2), and is parallel to another long side beam (18); the Y-direction force sensor and the X-direction force sensor on the loading member (14) The wires of the Y direction servo motor on the Y direction transmission mechanism are all fixed on the ring of the wire slide bar of the wire dragging slide bar assembly (13), and the pxi controller is connected with the X direction servo motor of the X direction transmission mechanism respectively. 1. The Y-direction servo motor on the Y-direction transmission mechanism is connected with the Y-direction force sensor and the X-direction force sensor on the loading member (14). 2. The two-degree-of-freedom cyclic load simulation device under a kind of supergravity environment according to claim 1, characterized in that: the two horizontal adjustment supports (1) with the same structure both include two spacers (15 ) and crossbeam (16); spacer (15) is installed in the two ends below crossbeam (16) respectively, and crossbeam (16) has long chute along the outside of length direction. 3. The two-degree-of-freedom cyclic load simulation device in a supergravity environment according to claim 1, characterized in that: the device base (2) includes two long side beams (18), two short side beams (19) and X direction motor support seat (20); Short side beams (19) are respectively housed between the inner sides of two long side beams (18) two ends, X direction motor is housed at a short side beam (19) outside Support seat (20). 4. A two-degree-of-freedom cyclic load simulation device in a supergravity environment according to claim 1, characterized in that: the X-direction transmission mechanism includes an X-direction servo motor (3), an X-direction reducer (4) , X-direction ball screw (6), two X-direction bearing assemblies (5) and two X-direction linear guide rails (7); the X-direction reducer (4) is installed on the X-direction motor The servo motor (3) is connected to the X-direction reducer (4), and one end of the X-direction ball screw (6) passes through an X-direction bearing assembly (5) on a short side beam (19) of the device base (2) Finally, it is connected with the X-direction reducer (4) through the coupling, and the other end of the X-direction ball screw (6) is matched with the nut on the support member (8) of the Y-direction transmission mechanism, and installed on the device base (2 ) in another X-direction bearing assembly (5) on another short side beam (19). 5. The two-degree-of-freedom cyclic load simulation device under a kind of supergravity environment according to claim 1, characterized in that: the Y-direction transmission mechanism includes a Y-direction transmission mechanism support member (8), a Y-direction servo motor ( 9), the Y-direction reducer (10), the Y-direction bearing assembly (11) and the Y-direction ball screw (12); the Y-direction reducer (10) is installed on the top surface of the Y-direction transmission mechanism support member (8), and the Y-direction The servo motor (9) is connected to the Y-direction reducer (10), and one end of the Y-direction ball screw (12) passes through a Y-direction bearing assembly (11) to connect with the Y-direction reducer (10). The other end of the rod (12) cooperates with the nut mounted on the loading member (14) and is mounted in another Y-direction bearing assembly (11). 6. A two-degree-of-freedom cyclic load simulation device under a supergravity environment according to claim 1, characterized in that: said Y-direction transmission mechanism support member (8) includes an upper top plate (22), a lower bottom plate (23 ), backboard (24), two sideboards (25) and two right-angle supports (26); ) connection, the two side plates (25) are equipped with a back plate (24), and the right-angle supports (26) are respectively installed outside the respective side plates (25), and respectively form a moving pair with the respective X-direction linear guide rails (7). . 7. A two-degree-of-freedom cyclic load simulation device under a supergravity environment according to claim 1, characterized in that: the loading member (14) includes a loading mechanism connector (27), an X-direction force sensor (32 ), Y-direction force sensor (29), X-direction loading head (33) and Y-direction loading head (30); The lower end of (27) is provided with Y direction load head chute (31), and one end of X direction force sensor (32) is connected with Y direction load head chute (31), and the other end of X direction force sensor (32) is connected with X direction force sensor (32). Connect to the loading head (33), the X-direction loading head (33) faces the X-direction servo motor (3) side, and the outward vertical end of the middle part of the loading mechanism connector (27) has an X-direction loading head chute (28) , one end of the Y-direction force sensor (29) is connected to the Y-direction loading head chute (31), the other end of the Y-direction force sensor (29) is connected to the Y-direction loading head (30), and the Y-direction loading head (30) faces One side of the bottom surface of two horizontal adjustment supports (1). 8. A two-degree-of-freedom cyclic load simulation device under a supergravity environment according to claim 1, characterized in that: the wire dragging slider assembly (13) includes two wire slider connecting blocks (34) , X direction limit switch installation fixture (35) and wire slide bar (36); Wire slide bar (36) is housed between two pieces of wire slide bar connecting blocks (34), and X direction is housed above the wire slide bar (36). Limit switch installation fixture (35), X has slotted hole along the length direction to limit switch installation fixture (35), is covered with a plurality of rings on the lead slide bar (36), and lead wire is fixed on the ring, when device During the movement, the ring slides freely on the guide rod, so as to realize the movement traction of the wire.