31results about How to "Prevent lateral vibration" patented technology

The present invention provides a elevator device. In the elevator device, an actuator for generating a vibration-damping force against the lateral vibration of a car is installed in parallel to an elastic body for preventing the lateral vibration. The actuator is controlled by a vibration-damping control unit. The control unit estimates the inherent frequency of the lateral vibration of the car, and finds a gain value based on the estimated inherent frequency and the rigidity value of the elastic body. Then, the damping control part drives the actuator according to an instruction signal with multiplication of the found gain value.

An experimental setup for bridge deck large-amplitude vertical-torsional coupled free vibration in wind tunnel test, which belongs to the technical field of wind tunnel test apparatus. The experimental setup includes the rigid model, the rigid circular rods, the lightweight rigid circular sprockets, the chains, the linear tensile vertical springs, the bearings, the sliders, and the guides. For the new setup, large-amplitude vertical-torsional coupled free vibration of a rigid deck model that failed in conventional testing device can be adapted by the vertical deformation of the springs without any lateral tilt. As a result, the possible nonlinear mechanical stiffness due to the springs tilt in conventional testing device is excluded. In addition, owing to the low rolling friction and damping between the sprockets and the chains, the mechanical damping ratio of the system are quite low and stable for very large-amplitude vibrations.

A heddle frame (1) is driven via drive rods (15), which pass through its lateral sampsons (13). To that end, the lateral sampsons (13) each have a corresponding channel (19). The play between the circumferential face (22) of the drive rods (15) and the channel wall face (21) of the respective channel (19) has an intermediate layer (24), which extends over the full length, or portions, of the drive rod (15). The intermediate layer (24) preferably comprises an impact-proof, permanent-elastic, damping material. A slight residual play allows the introduction of the drive rods (15) and the intermediate layer (24) into the channel (19) without force.

The invention relates to an axial thrust roller type centralizer bit, and belongs to the technical field of bits. The axial thrust roller type centralizer bit comprises a bit main body. One end of thebit main body is provided with a plurality of blades in the circumferential direction. Each blade is connected with a diameter retaining block. The axial thrust roller type centralizer bit is characterized in that each diameter retaining block is provided with a groove with an opening facing outwards, and each groove is internally and fixedly provided with a roller rotating shaft; each roller rotating shaft is rotationally provided with a thrust roller provided with a protruding diameter retaining block, and the thrust rollers are arranged in the circumferential direction of the bit main bodyin an inclined and deflected mode; and the deflection direction is the left rotating direction of the axial direction, and a bus of each thrust roller is curved. The axial thrust roller type centralizer bit has the beneficial effects that during drilling, the thrust rollers can produce axial splitting force, the drilling pressure can be improved, pressure taking off can be effectively reduced, the bit is pushed to drill forwards, and the drilling efficiency is improved; and the contact widths between the thrust rollers and the wellbore are increased, the circumferential stability of the bit is increased, and transverse vibration produced by the bit is reduced effectively.

The invention provides a mechanical stirring device for buildings, relating to the field of a stirring device. The mechanical stirring device comprises a box body, and the four corners of the bottom of the box body are fixedly connected with the top end of a press rod. The bottom end of the press rod penertates through a shock absorber and extends to the inner part of the shock absorber to be fixedly connected with the top of a press block, hydraulic oil is arranged in the shock absorber and is positioned at the bottom of the press block, and the bottom of the shock absorber is fixedly connected with the top of the press block. A discharge hopper is arranged in the box body, the bottom of the discharge hopper penertates through the box body and extends to the lower part of the box body, and a discharge valve is arranged on the surface of the discharge hopper and is positioned at the bottom of the box body. When a motor drives a rotation shaft to rotate, a fixing sleeve is fixed througha stabilizer in a stable box, and the rotation shaft slides along a concave ring groove through a roller. Therefore, the rotation shaft is effectively protected and is not easy to deform, and the impact on the stirring quality is effectively reduced.

The invention discloses a bolt connection interface micro-motion friction wear test device, which comprises an excitation system, a measurement system and a sample and support system, wherein the sample and support system comprises a bolt connection sample, a flexible guide plate, an outer support frame and a base; the excitation system comprises a piezoelectric actuator, a signal generator, a power amplifier, a knob and a force transferring ball; and the measurement system comprises a support block, a dynamic force sensor, a ring dynamic force sensor, a laser vibrometer, an optical lens, anda data collector. By using the piezoelectric actuator-driven closed-loop controlled high-precision bolt interface friction wear test device, broadband excitation, closed-loop control and precision optical displacement measurement are considered at the same time, friction wear test under various working conditions can be realized, and expansion to other connection forms and samples is easy. Besides, the device also has multiple protective measures to avoid equipment damage.

The polishing apparatus (10) is capable of precisely controlling polishing pressure, correctly positioning a press plate (47) and uniformly polishing a workpiece (W). In the polishing apparatus (10), a holding head comprises: first pressing means for introducing a pressurized fluid into a first fluid chamber (39) and pressing a main head section (24) downward; second pressing means for introducing a pressurized fluid into a second fluid chamber (50) and pressing a press plate (47) downward; and third pressing means for introducing a pressurized fluid into a third fluid chamber (64) and pressing the workpiece (W) downward. With this structure, the workpiece (W) is held on the lower side of an elastic sheet member (63), and the lower face of the workpiece (W) can be polished by a polishing plate (14).

The invention relates to the technical field of marine diesel engines, discloses an intelligent marine diesel engine attitude adjusting device, and aims to solve the problems that when a propulsion shafting of a ship runs, vibration is inevitably generated due to the influence of dynamic factors such as propeller hydrodynamic force, hull deformation and a lubricating film, and meanwhile, the operation of a diesel engine connected with the propulsion shafting also generates vibration; according to specifications, the marine diesel engine and the propulsion shafting must be subjected to vibration checking calculation, so that vibration sources are controlled, vibration is reduced, vibration sources are isolated, and equipment and personnel are protected; the intelligent marine diesel engine attitude adjusting device comprises a diesel engine upper-layer base, a diesel engine lower-layer base, a lateral clamping mechanism, swing jacking mechanisms, a ship body attitude sensor and a controller, and the controller controls the multiple swing jacking mechanisms to independently operate according to ship body attitude information obtained by the ship body attitude sensor. Posture adjustment of the lower-layer base of the diesel engine is achieved so as to reduce/eliminate swing amplitude of the marine diesel engine caused by stormy waves.

The invention provides a vehicle steering wheel control method and device, computer equipment, a vehicle and a storage medium, and belongs to the technical field of vehicles. The method comprises thefollowing steps that current running parameters of the vehicle are determined, wherein the running parameters comprise the running speed and a running path; the steering angle of a steering wheel in the vehicle is determined according to the running speed and the running path of the vehicle; a rotating speed value of the steering wheel in the vehicle is determined according to the running speed ofthe vehicle; and the steering wheel is controlled to rotate according to the steering angle and the rotating speed value of the steering wheel. Therefore, through the vehicle steering wheel control method, smooth control over the intelligent driving vehicle is realized, the driving and taking comfort degree of the vehicle is improved, and the user experience is improved.

The invention discloses external power dredging equipment for a small-pipe-diameter drainage blind pipe of a tunnel and a working method. The external power dredging equipment comprises a rotary driving device; a power output end of the rotary driving device is connected with a vibration cutting mechanism through a power transmission mechanism; the power transmission mechanism is sleeved with a sliding pipe and a fixed pipe; one end of the sliding pipe is connected with the rotary driving device, the other end of the sliding pipe extends into the fixed pipe and is in sliding connection with the fixed pipe, and the vibration cutting mechanism extends out of the fixed pipe; the power transmission mechanism comprises a plurality of universal joints which are sequentially connected through connecting shafts, the universal joint at one end of the power transmission mechanism is connected with the rotary driving device, and the universal joint at the other end of the power transmission mechanism is connected with a cutting drill bit seat mounting column; and the multiple connecting shafts are rotatably sleeved with supporting pieces, and the multiple supporting pieces make contact with the inner walls of the corresponding sliding pipe and the corresponding fixed pipe. The blockage problem of the small-pipe-diameter drainage blind pipe can be quickly and conveniently dredged in a mechanical cutting and vibrating mode.

According to the method for confirming the optimal suspension force of the offshore test tubular column, the optimal suspension force of the offshore test tubular column can be confirmed by testing the tubular column under the conditions of certain transverse acting force distribution coefficient, water depth, tubular column wall thickness and test working condition parameters; the influence of different suspension forces on the maximum transverse vibration displacement and the amplitude of each order of the test tubular column is calculated, so that the optimal suspension force of the test tubular column can be selected, and a basis is provided for adjusting the suspension force during construction of the test tubular column. The offshore test tubular column is determined; the whole tubular column is pulled to avoid complex transverse vibration of the tubular column, the maximum displacement of the transverse vibration of the tubular column is reduced along with the increase of the hanging force at the upper end, the conclusion of the transverse vibration of the test tubular column can be effectively reduced by properly increasing the hanging force of the test tubular column, andtherefore guidance can be provided for mechanical behavior control and safe operation of the test tubular column.

The present invention provides a plastic movable guide having excellent noiselessness and assembling ability and capable of reducing production cost. On the pivoting front end side of the guide body 101, a plunger accommodating portion 101B, which a plunger of the tensioner can contact and press, is provided, and a reinforcing plate 108 is provided in a slightly recessed manner. The plunger receiving portion 108 is such that the reinforcing plate 108 does not protrude from the edge of the opening in the slit.