38results about How to "Constrained degrees of freedom" patented technology

The invention discloses an active-passive combined vibration isolator based on positive-stiffness and negative-stiffness parallel connection. The active-passive combined vibration isolator based on positive-stiffness and negative-stiffness parallel connection comprises a basic platform (10), a load-bearing platform (30), a passive vibration isolation unit and an active vibration isolation unit, wherein the passive vibration isolation unit is provided with a positive-stiffness air spring (20) and a magnetic negative-stiffness mechanism (28) with adjustable negative stiffness in the first direction, so that the inherent frequency in the first direction is decreased, and the passive vibration isolation unit is provided with a stiffness-adjustable positive-stiffness leaf spring and a negative-stiffness inverted pendulum in the second direction, so that the inherent frequency in the second direction is decreased; the active vibration isolation unit is arranged at the outer side of the passive vibration isolation unit, the upper end of the active vibration isolation unit is linked with the load-bearing platform (30), and the lower end of the active vibration isolation unit is linked with the basic platform (10); and the active vibration isolation unit comprises displacement sensors, speed sensors, a proportional pressure valve and a voice coil motor, and the voice coil motor is used for fine adjustment of the load-bearing platform, so that vibration is further isolated. The active-passive combined vibration isolator based on positive-stiffness and negative-stiffness parallel connection has high bearing capacity, and active and passive vibration isolation of two degrees of freedom is achieved at the same time.

The invention discloses a method for reconfiguring a protocol stack based on an assembly. The method comprises the following steps: simultaneously comparing a protocol assembly of the current protocol stack with the whole of a protocol assembly of the reconfigured protocol stack; confirming that different protocol assemblies exist, and then stopping running the current protocol stack; replacing the protocol assembly of the current protocol stack in the different protocol assemblies with the protocol assembly of the reconfigured protocol stack with same or similar function, and then starting up the running of the protocol assembly of the current protocol stack. The invention also discloses equipment and a system for reconfiguring a protocol stack based on an assembly. The invention can improve the success ratio of reconfiguration and effectively lower the time delay of the reconfiguration.

The invention relates to a box culvert carrying auxiliary support. The auxiliary support comprises a frame, wherein the frame comprises a first supporting plate and a second supporting plate, and thelength of the first supporting plate is greater than the length of the second supporting plate; the second supporting plate is rotationally connected to one end of the first supporting plate in the length direction through a hinge shaft, and the second supporting plate can rotate from a folded position to an unfolded position around the hinge shaft; a plurality of first baffles are arranged on theside wall, perpendicular to the hinge shaft, of the first supporting plate, and a plurality of second baffles are arranged on the side wall, away from the first supporting plate, of the second supporting plate; and when the second supporting plate is in the unfolded position, the first supporting plate and the second supporting plate are perpendicular to each other to form a containing area, andthe first baffles and the second baffles are arranged in a protruding mode towards the containing area. According to the box culvert carrying auxiliary support, a box culvert can be turned over 90 degrees before loading, and corners of the box culvert can be prevented from being damaged in the turning over process.

The invention discloses a sea transfer trestle with wave compensation function and a working method thereof. The sea transfer trestle includes a heave mechanism, a trestle system and an active wave compensation control system. The invention can compensate the disturbance of the transfer trestle due to the swaying motion of the two ships, even if there is a difference in freeboard between the host ship and the target ship, it can still ensure that the safe angle between the trestle bridge body and the horizontal plane remains unchanged during the personnel transfer process of the transfer trestle bridge. Improve the safety and comfort of personnel transfer between two ships at sea. After the transfer trestle bridge of the present invention is lapped, the front end of the trestle bridge body is fixedly connected to the transfer point, and the personnel transfer process only needs to control the heave mechanism to ensure that the trestle bridge body and the horizontal plane maintain a safe angle. The front end of the trestle bridge body of the present invention and the transfer point are fixedly connected by electromagnetic landing cones, without additional mechanical devices for fixing, so that the trestle bridge body can be quickly separated from the transfer point in an emergency, and can be lifted urgently to improve safety sex.

The invention discloses an aircraft skin no-allowance milling flexible tool. Multiple double-rod support units, multiple four-rod support units and multiple reference support units are arranged on a tool frame; bulb locking mechanisms are mounted on the double-rod support units and the four-rod support units; suckers or edge clampers are mounted on the bulb locking mechanisms; machining zero adaptors and assembly hole adaptors are arranged on the reference support units; the tool frame has a base; a connecting bracket is arranged on the base; a random support plate is arranged on the connecting bracket; multiple mounting holes are formed in the random support plate; expansion sleeves are mounted in the mounting holes; connecting rods are inserted in the coaxial mounting holes, and are locked through the expansion sleeves, so that the connecting rods and the random support plate are fastened; and the double-rod support units, the four-rod support units or the reference support units are mounted on the connecting rods. The aircraft skin no-allowance milling flexible tool has the advantages of simple structure, low cost, extensibility of modular structure, high clamping rigidity of thin-wall skin and convenience for application and promotion.

The invention provides a constrained helix-based foldable catch-and-change mechanism, which includes a plurality of identical change-and-change units. The two scissor rods are connected to each other through the rotating pair R1 to form a scissor mechanism; the bottom ends of the two connecting rods are respectively connected to the top ends of the two scissor rods through the rotating pair R2 and R3; The first rotating rod, the second rotating rod, the third rotating rod, the fourth rotating rod, and the fifth rotating rod; the fifth rotating rod is connected to the top of the connecting rod through the rotating pair R4, and the first rotating rod is connected to the connecting rod through the rotating pair R5 The bottom end of the scissor bar; the two rotating branches are connected to each other through a hinge mechanism. The present invention realizes reducing the number and types of degrees of freedom by controlling the redundant degrees of freedom and retaining the two degrees of freedom of folding and catching. Realize the simplification of the structure.

The invention discloses a drying wheel of a cigarette hard packet packer. The drying wheel comprises an upper rotating frame and a lower rotating frame which are coaxially arranged. An upper fixing rod and a lower fixing rod are arranged at corresponding positions of the edge of the upper rotating frame and the edge of the lower rotating frame respectively. A nylon module is fixed between the upper fixing rod and the lower fixing rod. The drying wheel is characterized in that the nylon module is an isosceles trapezoid column; the middles of the upper bottom face and the lower bottom face, parallel to each other, of the nylon module are each provided with two through grooves; every two corresponding through grooves are communicated through a through hole; a connecting block is placed in each through groove at the smaller end; the position, corresponding to the corresponding through hole, of each connecting block is provided with a threaded hole; locking screws penetrate the through holes and are connected with the threaded holes in the connecting blocks; and the connecting blocks are fixed between the upper fixing rod and the lower fixing rod. The drying wheel has the beneficial effect that the nylon module can be fast replaced.