30results about How to "High force measurement accuracy" patented technology

The invention discloses a method and system for determining the position of a strain gauge of a dynamometric wheel set. The method comprises the following steps: determining the strain gradient changeof a wheel spoke plate; according to a periodic change of a wheel spoke plate strain gradient response in a circumferential rotation direction of the wheel, determining harmonic components of different strain responses through FFT; according to the strain gradient and constraint conditions corresponding to different subharmonics, determining the position of a strain gauges on the same circumference of the wheel spoke plate by adopting a mean square error method; calculating a sensitivity transfer coefficient matrix and a measurement error value by adopting a least square pseudo-inverse methodaccording to the initial position of the strain gauge on the dynamometric wheel set in combination with a wheel set calibration test bed; and adjusting the initial position of the strain gauge on thedynamometric wheel set according to the strain gradient change and the control measurement error value to obtain an adjusted position, and determining the adjusted position as the position of the strain gauge on the dynamometric wheel set. According to the invention, the force measurement precision and the higher reliability of the force measurement wheel set can be improved.

The invention provides a structural timber bend strength tester, which comprises an engine base, a force-applying mechanism and a data acquisition device; slide ways are arranged on the engine base, two movable supports are arranged on the slide ways, and bent brackets are arranged on the movable supports; a hydraulic cylinder unit of the force-applying mechanism is arranged on the engine base, the force-applying mechanism also comprises a force-applying crossbeam and one or more force-applying holders, an upright is arranged on the engine base, the force-applying crossbeam is arranged on the upright and can vertically or horizontally move, the force-applying holders are arranged on the force-applying crossbeam and can move along the force-applying crossbeam, and the force-applying crossbeam is arranged on a moving part of the hydraulic cylinder unit; the data acquisition device comprises a force sensor and a displacement sensor, and the force sensor is arranged on the moving part of the hydraulic cylinder unit. The invention also provides a test method using the tester. According to the method and the tester, the bent strength of structural timbers can be conveniently and accurately measured.

The invention discloses a guide wire controller for an interventional operation robot and a control method of the interventional operation robot, and belongs to the technical field of minimally invasive vascular interventional operations. The controller comprises a basal part as well as a guide wire clamping mechanism and a clamping switching mechanism which are arranged on the basal part, whereinthe guide wire clamping mechanism is used for clamping a guide wire; the clamping switching mechanism is used for driving the guide wire clamping mechanism to loosen clamping on the guide wire; the guide wire clamping mechanism comprises a guide wire locking sleeve, a guide wire locking rod and a guide wire locker; one end of the guide wire locking rod is provided with the guide wire locker and is arranged into the guide wire locking sleeve; and the guide wire locker, which is squeezed by virtue of the guide wire locking rod, can clamp the guide wire. The guide wire controller provided by theinvention is simple in overall structure, and the guide wire controller, which adopts modular structure design, is simple and convenient in dismounting and mounting combination, compact in structure,light in overall weight and relatively low in manufacturing cost.

The invention provides a method for measuring three-dimensional contact force of the tail end of a mechanical hand of a teleoperation robot. The teleoperation mechanical hand comprises a connection totality of a mechanical arm and a mechanical paw, and is characterized in that two three-dimensional sensors are arranged; a first three-dimensional sensor is arranged between the forearm of the mechanical arm and the mechanical paw; a second three-dimensional sensor is arranged between the rear arm of the mechanical arm and the forearm of the mechanical arm; the mass of the mechanism paw is defined into m; the total mass of the first mechanical paw, the forearm of the mechanical arm and the first three-dimensional sensor are defined into M; m and M are brought into a computation formula; and the three-dimensional contact force of the teleoperation mechanical hand and the surrounding environment can be directly calculated. In the invention, the interference of the inertia force can be effectively eliminated without loading an accelerometer and the resolution of acceleration, thus the measurement accuracy of a three-dimensional force sensor for measuring the contact force of the mechanical hand can be improved; and the method has the characteristics of simplicity, convenience and accuracy and the like.

The invention discloses a test device of a built-in solar-protection hollow glass product. The test device comprises a main frame composed of a longitudinal frame and two horizontal rods fixed to the bottom of the longitudinal frame. Two inner sides of the longitudinal frame are provided respectively with two movable guide pillar guide sleeves. An upper clamping backer is movably arranged between the two movable guide pillar guide sleeves. The upper clamping backer realizes positioning compression of a glass product to be detected by a positioning compression device. Any side of the longitudinal frame is provided with a manipulator guide sleeve. A manipulator is removably connected to the manipulator guide sleeve. The manipulator is provided with a force sensor. The force sensor pushes the glass product to be detected to move upward and downward along the two movable guide pillar guide sleeves. A weight display, an operation display screen and an electrical control tank are installed on the horizontal rods and are connected respectively with the force sensor so that a force simulative test on the glass product to be detected is realized. The test device can effectively and conveniently realize a simulative test on a built-in solar-protection hollow glass product by a user.

The invention discloses a blocking mechanism simulation force measuring apparatus which includes a pedestal which includes three channel steels; right ends of the three channel steels are provided with a case body assembly which is provided with a force measuring support therein; the force measuring support is provided with a force measuring pin on the left side of an upper end thereof, and the case body assembly is provided with a fixing seat on the right side of an upper plane, and the force measuring pin and the fixing seat are intended for fixing a to-be-tested product during tests; left ends of the three channel steels are provided with a support assembly which is provided with two guide rods thereon which are parallel to each other, and one ends of the guide rods are provided with a top plate and the other ends of the guide rods are provided with an installing plate; two semi-arc pulling force shafts are oppositely arranged with one arranged on the force measuring support and the other arranged on the support assembly; a digital display force measuring device with two ends are in respective connection to the two semi-arc pulling force shafts; and a hydraulic jack is installed in the support assembly. According to the invention, the apparatus can meet demands for testing the opening and closing force of the blocking mechanism. The apparatus is characterized by reliable positioning, high structural strength, small deformation, easy mounting and dismounting, easy carrying, and repeatable usage.

The invention discloses a novel internal card jack and a method for using the same. The novel internal card jack comprises a positioning nut, a through sleeve, a piston, an oil cylinder, a top pressure plate and a tool anchor plate, the through sleeve is located in the oil cylinder, and the piston is mounted on Between the oil cylinder and the bushing, the sealing plate and the compression ring are installed in the middle of the oil cylinder and the piston as a sealing assembly from the inside to the outside. The tool anchor plate is installed at the left end of the inner test of the bushing, and a single steel strand is opened on the tool anchor plate. The hole through which the line passes; the load cell is installed on the inner side of the bushing, and the load cell is embedded in the inner side of the bushing and integrated with the bushing; the new internal card jack also includes a component for measuring the retraction value of the tool clip, and the tool clip is measured The miniature self-restoring sensor of the retraction value component can be disassembled and replaced with each other at any time. The installation and disassembly are simple and convenient, which can meet the multi-point displacement detection and the use of tension anchors in different hole positions, reducing the difficulty of engineering construction.