125 results about "Dynamic Tension" patented technology

The invention discloses an active heave compensation control system comprising a lifting reel, a ship attitude motion sensor, an absolute value encoder, a tension sensor and a compensation unit. The lifting reel is arranged on an offshore crane, a load is suspended by a wire rope which stretches from the lifting reel and goes across a suspension fulcrum at the front end of a support arm, and the load in immersed in water. Real-time detection of heave movement of the ship is performed by the ship attitude motion sensor. Real-time detection of movement of the lifting reel is performed by the absolute value encoder. Real-time detection of dynamic tension of the wire rope is performed by the tension sensor. The compensation unit is connected to the ship attitude motion sensor, the absolute value encoder and the tension sensor. Predictive parameters are calculated by the compensation unit based on historical data and real-time data of the heave moment of the ship, the movement of the lifting reel and the dynamic tension of the wire rope; and compensation voltage is provided for the lifting reel based on the predictive parameters. The invention also discloses an active heave compensation control method.

A bone screw including a head portion, an intermediate portion, and a threaded portion. The intermediate portion further includes a wave-type spring formed therein. In one exemplary embodiment, the wave-type spring is formed to have a lattice structure. In one exemplary embodiment, the wave-type spring of the intermediate portion is formed by laser cutting. By providing a wave-type spring in the intermediate portion of the bone screw of the present invention, the bone screw provides dynamic tension to maintain a bone plate or other orthopedic device in its desired position substantially adjacent a bone.

The invention discloses a testing device and a testing method for monitoring steel wire rope-friction pad dynamic micro-friction state. The testing device comprises a base frame, a loading system, a micro-slip system and a state monitoring system, wherein the loading system comprises a weight loading system, a hydraulic loading system and a steel wire rope; the micro-slip system comprises a support system, a drive system and a friction transmission system; the state monitoring system comprises a dynamic tension monitoring system, a pad stress measuring system, a friction force measuring system and a micro-slip monitoring system. By utilizing the testing device and the testing method, dynamic alternating tension can be applied to the steel wire rope and dynamic micro-friction can be applied between the steel wire rope and a friction pad simultaneously, and dynamic tension evolution of the steel wire ropes at both sides of the friction pad, micro-slip amplitudes of different sections of a contact arc of the steel wire rope and the friction pad, stress change of the friction pad near the contact zone of the steel wire rope and the friction pad and dynamic friction force between the steep wire rope and the friction pad can be measured in real time.

The invention provides a propeller dynamic tension and torque duplex measuring device and belongs to the technical field of force measurement. The propeller dynamic tension and torque duplex measuring device comprises a drive motor, a propeller, a bottom plate and a bearing seat. The propeller is provided with a spindle. The end, far from the propeller, of the spindle penetrates through the bearing seat and is in coaxial transmission connection with an output shaft of the drive motor through a dynamic torque sensor. The dynamic torque sensor is fixedly connected with the bottom plate. The bearing seat is provided with a tension and pressure senor. The tension and pressure sensor is connected with the bottom plate through a connecting part. The bearing seat is connected with the bottom plate in a sliding mode. The propeller dynamic tension and torque duplex measuring device can simultaneously measure dynamic tension and torque generated during rotation of the propeller, and is simple in structure, low in cost, high in measurement accuracy and convenient to install and maintain.

Provided is a floss dispenser comprises a housing defining at least a receiving chamber with a floss bobbin rotationally received therein. A floss fork is arranged at an end of the housing for bracing a section of floss thereon. A first tension-controlling device is arranged on the housing controlling a tension of the floss after the floss fork. And a tensioner is arranged adjacent to the feeding device controlling the tension between the floss bobbin and the floss fork. By the provision of the tensioner, the tension of the floss can be properly controlled during the flossing process, and the tension of the floss can be released after the flossing process.

The invention discloses a bending fatigue damage monitoring system for a steel wire under action of corrosion-alternating load coupling. The bending fatigue damage monitoring system comprises a driving system, an alternating force loading system, a reversing control system, a surrounding angle adjusting system, a corrosion liquid addition system, a steel wire and a steel wire status monitoring system. According to the bending fatigue damage monitoring system, the bending fatigue test for the steel wire under the action of corrosion-alternating load coupling can be realized, and the quantitative monitoring on the internal damage of the steel wire and the disclosure on the bending fatigue damage failure mechanism can be achieved. The bending fatigue damage monitoring system can be used for exploring the dynamic contact between the steel wire rope and a friction liner of a friction wheel under the working condition of simulating mine hoisting, local microslip amplitude and the dynamic tension evolution of the steel wire rope. The bending fatigue damage monitoring system can provide effective experimental equipment for the quantitative analysis of the bending fatigue failure characteristic of the steel wire under action of corrosion-alternating load coupling; and the bending fatigue damage monitoring system is simple and convenient to operate, complete in functions, good in effect, and has wide practicability in the technical field.

The invention discloses an ultra-deep vertical shaft winding type hoisting steel cable multi-axial friction fatigue damage monitoring device .The monitoring device comprises a tension-torsional fatigue system and a dynamic loading monitoring system which are arranged on a supporting system; the tension-torsional fatigue system comprises a low-speed large-torque motor and a servo electric cylinder A, the low-speed large-torque motor is connected with one end of a fatigue steel cable through a coupling A, a torque sensor, a coupling B, a shaft and a steel cable fixture A, and a threaded rod of the servo electric cylinder A is connected with the other end of the fatigue steel cable through a tension sensor and a steel cable fixture B; the dynamic loading monitoring system comprises a servo electric cylinder B, a threaded rod of the servo electric cylinder B is connected with a loading steel cable fixture through a two-dimension force sensor, a fixture block is arranged on a fixture rotary table of the loading steel cable fixture, and the loading steel cable is fixed on the fixture block .According to the ultra-deep vertical shaft winding type hoisting steel cable multi-axial friction fatigue damage monitoring device, cable multi-axial friction fatigue properties among steel cables under the dynamic tension-torsional combined fatigue loading action and dynamic contact and creep properties between the steel cables and a friction liner can be researched.

The invention relates to a dynamic tension fracture experiment method of a material, which is a manner of striking a target plate (2) with a flying sheet (1) to make the target plate (2) generate lamination crack or damage and is characterized in that the target plate (2) is a double-layer target comprising a first-layer target plate (10) and a second-layer target plate (11) which are clung together and prepared from an identical material; after the flying sheet (1) strikes the first-layer target plate (10), impact waves (3) are respectively generated to the flying sheet (1) and the first-layer target plate (10), when the impact waves arrive at the free surface of the flying sheet (1) and the free surface of the second-layer target plate (11), the impact waves are reflected to form rarefaction waves (4), and two bundles of rarefaction waves (4) move oppositely and encounter in the second-layer target plate (11) or the first-layer target plate (10) so as to generate enough strong tensile stress; and after a certain incubation time, a stress tensile region (5) generates lamination crack or damage to form a lamination crack surface or a maximal damage surface (8).

The invention belongs to the technical field of offshore oil and natural gas exploitation equipment safety monitoring and risk control, and relates to a method for monitoring anchoring line of deep-sea terrace. The method comprises the following steps: (1) installing a displacement transducer on the position of height of gravitational center of the terrace to monitor the motion displacement U0 of the terrace main body in real time, arranging a strain transducer on the anchoring line to monitor the strain of the anchoring line in real time and transmitting the monitoring data to a central computer; (2) calculating and analyzing whether the anchoring line appears relaxed-tensioned state; (3) calculating and analyzing dynamic tension; (4) comparing the calculated dynamic tension with the fracture tension of the anchoring line, judging whether the tension of the anchoring line is within the safe range, if not, implementing adjustment; (5) if needing adjustment, commanding the adjustment value of the anchoring line to each anchor gear, starting and controlling each anchor gear, adjusting the length of the anchoring line, and calculating whether the adjusted length of the anchoring line meets the requirement, if not, repeating the step. The invention can realize control on state and tension of the terrace anchoring line, can enhance the safety level of the terrace system and can reduce occurrence of grave accidents.

The invention provides a combined tension-torsion multi-axis fracture experimental system. The experimental system comprises a dynamic tension-torsion testing machine and a control device connected with the dynamic tension-torsion testing machine. The dynamic tension-torsion testing machine has an upper chuck, a lower chuck and a force sensor, and is clamped with a sample through the upper chuck and the lower chuck. The sample is a thin-walled tube with a notch, and is provided with a speckle. A deformation measurement system comprises a non-contact three-dimensional strain optical measurementsystem connected with the control device through a synchronous trigger device which comprises two cameras connected with the synchronous trigger device and an image acquisition and data processing device connected with the two cameras respectively. The invention also provides a combined tension-torsion multi-axis fracture experimental method. The invention adopts a sample of a thin-walled tube with a notch, which can obtain a low-stress triaxial level and different Rhodes parameter levels by changing different combined tension-torsion loading ratios. In addition, since the experimental systemcomprises a non-contact three-dimensional strain optical measurement system, measurement of full field strain can be achieved.

The invention discloses a tension adjusting device for a self-adaptive engine front end accessory gear train. The tension adjusting device comprises the engine front end accessory gear train and a belt tension control system. The belt tension control system comprises a piezoelectric sensor, an angle encoder, a comparator, a controller and an actuator. When the rotation speed of a crankshaft of an engine is zero, a tensioning wheel is in the preset position where the belt tension is smaller all the time; when the engine is started, the rotation speed of the crankshaft is gradually increased from zero, and the controller immediately controls the actuator to act, so that the tensioning wheel moves to the preset position where the belt tension is larger; and after the rotation speed of the crankshaft is stable, a tension value obtained by the piezoelectric sensor is compared with a preset tension value through the comparator, then the controller controls the actuator to act to adjust the position of the tensioning wheel so that the tension can be kept in a constant state. According to the tension adjusting device, the rotation speed of the crankshaft of the engine and the dynamic tension applied to the ribbed belt can be measured in real time, and the position of the tensioning wheel can be adjusted actively, so that the purpose that the tension of the belt is adjusted according to the running state of the self-adaptive engine is achieved.

The invention relates to a synchronizing system of a multi-transmission rubber belt conveyor and belongs to the technical field of metallurgical mines. The synchronizing system has the advantages that the computer synchronizing control technology is improved, four motors at the head drive a rubber belt conveyor in a balanced manner while the current and frequency of the drive motor at the tail are synchronously calculated and adjusted in real time to allow the output power and the operation speed of all the motors at the head and at the tail to be balanced so as to guarantee stable operation of the rubber belt conveyor, impact on machinery and an electric system during fast starting/fast shutdown is lowered, belt overlapping is avoided, possible harm, caused by rubber belt conveyor dynamic tension waves, to a rubber belt and mechanical equipment is restrained effectively, the service life of the rubber belt conveyor is prolonged, and safety and reliability of a conveying system are increased.

The invention relates to a dynamic tension sensor applicable to linear, rope-shaped, beam-shaped, strip and sheet materials, comprising a flexure strip with uniform section, with the two ends fixed on a slab, and a torsion shaft which passes through the centers of the slab and the flexure strip; one end of the torsion shaft is a detecting end and is fixed with two groups of magnetic bodies, one side or two sides of the detecting end is/are provided conductive component of a tested object, and the other end of the torsion shaft is provided with two magneto-dependent sensors of the same class in the magnetic field of the two groups of the magnetic bodies; the influence of temperature shift can be eliminated by utilizing the dual sensors, and the gravity influence of the other side can be eliminated by the adjustment of one side of the flexure strip; the dynamic tension sensor has the advantages that the function of the flexure strip and the torsion shaft is combined and utilized to convert the tension change of the tested material into the corresponding displacement of the torsion shaft, and the displacement is corresponding to the magnetic-field strength change of the tail end of the torsion shaft and has linear relationship with the output voltage of a magneto sensor, therefore, automatic online detection can be carried out to the tension change of the tested material.

The invention is a back brace including a back panel, a front panel, and at least one dynamic tension strap for connecting the front panel to the back panel.

The invention relates to an impact dynamic tension test method and a device thereof of a ring laser, relating to the technical field of dynamic tension mechanics performance test of materials. In the invention, a high power ring pulse laser is adopted to contain a test-piece in a hollow part of a laser beam; and a ring pulse laser gets through the test-piece via the hollow part and impacts a target, so that the test-piece arranged between a bracket and the target acquires instant tension so as to complete the impact dynamic tension test of the test-piece. The method and the device of the invention are used for for measuring dynamic stress strain relation of the materials under ultrahigh strain state, the device has simple structure, simple and convenient test process, and can perform direct dynamic tension test; and the method and the device can perform the dynamic tension test of the materials under the conditions of different high strain rates and ultrahigh strain rates, thereby having low cost and good application prospect.

The invention discloses an automatic variable-pitch propeller device, a control method thereof and an aircraft. A variable-pitch driving device is connected with a propeller through a variable-pitch structure, and the pitch of the propeller is adjusted by operating the variable-pitch structure; a tension measuring module is connected with a propulsion system and is used for measuring the dynamic tension of the propulsion system; a variable pitch controller determines real-time propeller efficacy value information according to the dynamic tension and input power, determines a target pitch rangeaccording to the propeller rotating speed and airspeed information, and provides a pitch value in the target pitch range by using an automatic optimization method according to the propeller efficacydata, and the propeller performs variable pitch operation. The device can calculate the propeller efficacy value of the propulsion system in real time, automatically optimizes and matches the optimalpitch based on propeller efficacy, and improves the efficiency of the propulsion system of the aircraft.

A process for manufacturing continuous non-woven cloth and cross cloth with more than two layers relates to the technique of manufacture process of the non-woven cloth. The process for manufacturing the non-woven cloth comprises installing a fiber tube; enabling dynamic tension of fiber bundles to be consistent; forming fibers parallelly arranged at equal intervals and accurately positioned; drawing the fibers into a main machine; enabling fibers entering the main machine and accurately positioned to enter a first silk spreading mechanism through a tension evening mechanism and enabling the whole fibers to be drawn to form even seamless fiber pieces; forming even seamless fibers with tension adjustable; forming fiber pieces evenly coated by binding agents; forming non-woven cloth without being dried and sized; forming even seamless dried and sized non-woven cloth or orthogonal cloth; forming coiled non-woven cloth or multilayer orthogonal cloth; and breaking the cloth and uncoiling the cloth to successfully finish the manufacture. The invention further provides the process for manufacturing the cross cloth with more than two layers. The process for manufacturing the continuous non-woven cloth and the cross cloth with more than two layers solves the problems that existing efficiency is low, quality is not up to requirements, fiber trace is visible, and strength of the cross cloth is reduced because of additionally coating one layer of the binding agents.

The invention discloses a dynamic tension experiment fixture. The dynamic tension experiment fixture comprises a main fixture, clamping pieces and a thread fixing fixture, wherein a hole is formed in one end of the main fixture; an internal thread and an internal conical surface are sequentially formed on the inner wall of the hole from outside to inside; an external thread matched with the internal thread of the main fixture is formed on the periphery of one end of the thread fixing fixture; a center hole allowing a lath-shaped test piece to pass through is formed along an axis of the thread fixing fixture, a taper hole coaxial with the center hole is formed in one end, extending into the main fixture, of the thread fixing fixture, and the minimum aperture of the taper hole is larger than the center hole; the two symmetric clamping pieces are configured and used for clamping the lath-shaped test piece, and shapes of two ends of each clamping piece are matched with the shape of the internal conical surface of the main fixture and the shape of taper hole of the thread fixing fixture respectively. The test piece is simple to process, the clamping operation is convenient, the experiment efficiency is high, and the dynamic tension experiment fixture can be applicable to test pieces with different thicknesses.

A method for dynamically controlling a loop angle of a hot continuous rolling mill adopts a strip steel rolling force detector, a strip steel speed detector, a loop angle detector, a strip steel tension detector, a basic automatic level control machine and a process control machine to conduct dynamic control on angles of six loops among seven continuous rolling mills according to the set process requirements, accordingly the stability of the loops during strip steel throwing is improved, specifically variable-angle control before strip steel throwing and a unary function loop angle compensation method are adopted to achieve continuous dynamic control in the control process according to change of angle and tension control, meanwhile synchronous and dynamic tension control is achieved in the tension control process according to angle change, and the stability of the loops in the strip steel throwing process is improved greatly.

The invention relates to a synthetical fatigue testing system and a synthetical fatigue testing method for extensional vibration and torsion of a composite insulator. The system comprises a linkage mechanism, a tension sensor, a static and dynamic load linkage loading mechanism, a cooling system and a torsion loading mechanism which are connected end to end, wherein the tension sensor, the static and dynamic load linkage loading mechanism, the cooling system and the torsion loading mechanism are respectively connected with a measurement control system; the static and dynamic load linkage loading mechanism and the torsion loading mechanism are respectively connected with a base. According to the system, one end of the composite insulator is applied with static tension along the axial direction and the dynamic tension with adjustable frequency, and the other end of the composite insulator is applied with the torsion tension with adjustable frequency by the measurement control system; a testing condition is provided for the fatigue property research of the composite insulation under the comprehensive effects of static load, dynamic extensional vibration load and the torsion load.

The invention discloses an anchor solid dynamic tensile testing device and method. A heavy hammer-lever device is applied, impact loads generated when a heavy hammer freely falls are converted and amplified into impact loads acting on an anchor rod, the quantity values of tensile loads borne by the anchor rod are changed by adjusting the position of a lever fulcrum, and a response rule on an anchor solid interface under different loads and different tensile speeds is researched. By the adoption of a guide device and a lever amplification device, dynamic tension of the anchor rod is achieved, and a first researched interface debonding failure rule and a second researched interface debonding failure rule have certain engineering significance in a rock burst anchoring roadway anchor solid failure mechanism.

The invention discloses a dynamic radial deformation and dynamic tension monitoring device of a deep-well double-broken-line-type multi-layer winding elevator steel wire rope. The device comprises a pedestal, a driving system, a tension-compression detection system and a dynamic deformation monitoring system. The driving system comprises an electromotor. The electromotor is connected to a roller through a shaft coupling A, a speed reducer and a shaft coupling B. An outer side of a roller baffle plate is tightly contacted with a brake disc. The tension-compression detection system comprises a servo electric cylinder. A S-type tension sensor is connected to the servo electric cylinder and a steel wire rope clamp respectively. A roller surface is provided with a friction liner. A steel wire rope winds a double-broken-line rope groove of a friction liner surface. One end of the steel wire rope clamp is locked through the steel wire rope clamp. A back side of the friction liner is axially provided with a plurality of sensor installation grooves along the roller. A weighing-type pressure sensor is arranged in one sensor installation groove. The dynamic deformation monitoring system comprises a two-dimensional laser sensor. In the invention, tension characteristics of a steel wire rope under various kinds of work conditions can be simulated and a deformation quantity and a tension force of each layer of the steel wire rope can be accurately detected.

The invention discloses a clamping device of a Hopkinson pull bar test-piece and an experimental method and belongs to the field of shock dynamics experiment. The experimental device is used in pairs. One end of an adapter is in threaded connection with an incident bar or transmission bar, and the threaded clearance is filled with thread seal tape so as to avoid the damage of shock wave to connecting thread; and the other end of the adapter is provided with a square groove to be connected to a flat test-piece. The square groove which matches the test-piece undergoes plane machining into tiny serrated teeth so as to increase frictional force during clamping. The outer rim of the adapter is processed into taper thread which matches a nut. When the clamping device is in use, clamping force perpendicular to the groove surface is provided by screwing-in the nut. According to the invention, the problem that screw thread is not easy to process in a composite material and high-strength glue is nonuniform during gluing process can be greatly avoided, connection type of a fibrous composite material under dynamic tension is studied, and a forceful foundation is laid for the constitutive relation of the fibrous composite material under dynamic tension.