487 results about "Tangential force" patented technology

A protective helmet is described comprising: an outer layer (1); an inner layer (5) for contact with a head of a wearer; and an intermediate layer (3, 4) comprising an anisotropic cellular material comprising cells having cell walls, the anisotropic cellular material having a relatively low resistance against deformation resulting from tangential forces on the helmet. The anisotropic material can be a foam or honeycomb material. The foam is preferably a closed cell foam. The helmet allows tangential impacts to the helmet which cause less rotational acceleration or deceleration of the head of the wearer compared to helmets using isotropic foams while still absorbing a significant amount of rotational energy.

The invention according to the present invention relates to an intermediate layer (1) of friction decreasing material placed between two layers (2, 3). The intermediate layer (1) is adapted to create a sliding movement between the layers (2, 3) when a force (K) is applied and a tangential force component (K_T) shears the layers. The friction decreasing material comprises fibers (F).

The invention discloses a rotating-type grain distributor and a granary provided with the grain distributor, and belongs to the technical field of granaries. The rotating-type grain distributor comprises a grain collecting barrel. The grain collecting barrel comprises a barrel wall and a barrel bottom. The outer side of the barrel wall of the grain collecting barrel is provided with two downward-inclined grain sliding pipes. The bottom face and one side face of each grain sliding pipe are curved surfaces which are of an integral structure. When the rotating-type grain distributor is used, the rotating-type grain distributor is arranged at a grain inlet of the granary, after grain enters the grain collecting barrel, the grain flows into the grain sliding pipes, and when the rotating-type grain distributor rotates, the grain sliding pipes rotate along with the rotating-type grain distributor. Due to the fact that the bottom face and one side face of each grain sliding pipe are curved surfaces which are of the integral structure, when the rotating-type grain distributor rotates, under the effect of centrifugal force and tangential force generated by the curved surfaces, the grain is scattered and flows out of the grain sliding pipes, and the grain falls onto a circular cross section of the granary. According to the rotating-type grain distributor, the impurity accumulation caused by automatic grading formed by concentrated falling of the grain is alleviated, and the safe storage of the grain is guaranteed.

Various techniques are provided for reducing the impact of tangential forces on touch location in a touch location device. For example, in one aspect, shunt connections are provided that impede lateral motion of the touch surface structure at the level of the touch plane, thereby reducing to insignificant magnitude reactions to tangential force passing through the sensing connections. In another aspect, sensing connections incorporate elastic means so adjusted as to turn that connection's reaction to tangential touch force perpendicular to its axis of sensitivity. In another aspect, sensing connections incorporate sensing means so adjusted as to turn that connection's axis of sensitivity perpendicular to its reaction to tangential force.

A system and related method for improving tire uniformity includes providing a number (n) of test tires manufactured in a known order and identifying at least one candidate cyclic process effect with a corresponding frequency of introduction (f). A given uniformity parameter, such as radial or lateral run-out, balance, mass variation, radial lateral or tangential force variation, is measured for each tire in the test set, and measured data points are combined into a concatenated composite waveform. At least one process harmonic associated with each identified cyclic process effect is separated from the tire harmonics, for example, by Fourier transformation with identification of the process harmonics as positive integer multiples of the mth harmonic of the measured uniformity parameter where m=n/f. Once the process harmonics are extracted, filtered uniformity measurements can be provided or new tires can be built with the process effect minimized.

A system and related method for improving tire uniformity includes identifying at least one candidate process effect and a corresponding process harmonic number for each process effect. A given uniformity parameter, such as radial or lateral run-out, balance, mass variation, radial lateral or tangential force variation, is measured for each tire in a test set, such that the measurements contain tire harmonics as well as a process harmonics corresponding to each candidate process effect. Rectangular coordinate coefficients are electronically constructed for each said process harmonic, after which point the rectangular coordinates corresponding to each process harmonic are solved for (e.g., by using regression-based analysis). The magnitude of each said process harmonic is estimated, and a final magnitude estimate for each process harmonic can be determined by summarizing (e.g., by taking the average or median value) the respectively estimated magnitudes for each process harmonic across all test tires.

Methodology for characterizing non-uniformity forces at a tire spindle, such as low and high speed radial force variations and high speed tangential force variations include the steps of measuring radial run out and radial or tangential force variations at high and/or low speeds. From such measurements, the contribution of a predetermined type of stiffness variation (e.g. radial, tangential, extensional, bending) to respective radial and/or tangential force variations can be determined. Signature analysis statistical methods may also be utilized to characterize such tire non-uniform forces for different steps and reference physical angles of a tire construction process. Based on the characterization of such tire non-uniform forces, additional process steps may further correspond to tire grading and/or sorting processes, physical tire modification processes and tire manufacturing processes. Tire correction mechanisms and/or feedback control in a tire manufacturing process preferably yield tires having radial run out and stiffness variation parameters that are out of phase for one or more harmonics, thus yielding a reduction in the non-uniformity forces such as radial and tangential force variations at a tire spindle.

The invention discloses a method for stripping off green husks of nuts through a mechanized dry process and relates to a fruit processing technique, in particular to a processing technique for stripping off the green husks of the nuts. Crossed reticular knife marks are cut on the surfaces of fermented mature green nuts through two spiral knife rolls which have opposite spiral directions and rotate in the same direction at different speeds, and then the spiral knife rolls rotate to apply tangential force and axial force on the nuts to rotate and turn over the nuts so as to enable the green husks to be split and separated from the surfaces of the nuts. Since the spiral knife rolls have sharp edges, when the spiral knife rolls cut into the green husks, sap in the green husks is not squeezed out and is prevented from contaminating the exterior surfaces of the nuts during processing. Though the entire green husk stripping motions are equivalent to simulated manual stripping actions, the mechanized high-efficiency application of the green husk stripping action is realized. Therefore, the invention provides the effective method for stripping the green husks of the nuts through the dry process.

The invention relates to a cutter abrasion online monitoring method based on wavelet packet analysis and a radial basis function (RBF) neural network. The method comprises the steps that shear force coefficients and cutting edge force coefficients of tangential force and radial force in different cutter abrasion states are calibrated by means of an instantaneous cutting force coefficient recognition method; and by analyzing the correlation between cutting force coefficients and cutter abrasion, the coefficients are taken as cutter abrasion characteristic parameters and input into a RBF neutralnetwork model after being subjected to normalization processing. An input layer of a RBF neutral network monitoring model training process comprises cutting force characteristics, cutting vibration characteristics, the shear force coefficients and the cutting edge force coefficients after being subjected to normalization processing; and an output layer comprises the cutter rear cutter surface abrasion capacity after being subjected to normalization processing; a hidden layer comprises neurons obtained through radial basis function iterative optimization; and it is verified that the RBF neuralnetwork monitoring model has the advantages of high response speed and high recognition precision through cutter abrasion monitoring experiments.

The invention provides a simple, accurate and field airbag-loading potable soft and weak interlayer direct shear apparatus. In the direct shear apparatus, airbag loading is adopted to apply a normal force, and a piston system arranged on the upper part of a reaction frame can guarantee the verticality and application uniformity of the normal force when a sample produces shearing displacement; and a ball screw system applies a tangential force and linear guides under a sample seat can guarantee the horizontality of the application direction of the shearing force and the continuity and smoothness of the tangential force. A normal force applying system avoids bearing load, and airbag pressurization is accomplished by a potable pressurizing device and is high in precision, simple and easy to implement. A tangential force applying system uses a screw handle to apply force and the force application is steady and highly operable. Both the normal force applying system and the tangential force applying system are fixed, small in volume, high in reliability and convenient in on-site test. The test device can perform the quick shearing of field soft and weak interlayer and consolidated drained quick and slow shear tests and is simple, precise and high in operability.

The invention relates to an in-situ micro-nano indentation/scratch test platform and a test method, and belongs to the field of electromechanical integrated precision scientific instruments. An X axis precision scratch unit and a Y axis large-stroke stick-slip drive scratch assembly are assembled at the tail of a base, a Z axis macro-movement adjusting mechanism is assembled at the middle of the base, a motor driving unit is assembled at the head of the base, a precision pressing driving and displacement signal detecting unit is installed on the Z axis macro-movement adjusting mechanism, and a precision three-axis force sensor used for detecting an indentation pressing force and a normal force and a tangential force of a scratch is installed on the X axis precision scratch unit. The in-situ micro-nano indentation/scratch test platform has the advantages of compact structure, miniaturization, integration, and capability of better ensuring the assembly precision, effectively improving the overall rigidity and dynamic properties and improving the overall test precision while overcoming the defect that an existing test platform cannot be used for quantitatively detecting the normal force and the tangential force in a scratch process.

The present invention discloses a bending forming processing equipment for pipe material. Said equipment includes the following several portions: bending die clamping die, pressing die, pressurizing plate, circumferential pressure-applying hydraulic cylinder, axial propulsion hydraulic cylinder and bending machine working table. The circumferential pressure-applying hydraulic cylinder pushing rod is rigidly connected with the pressurizing plate, the axial propulsion hydraulic cylinder pushing rod is flexibly connected with the pressing die end portion. The circumferential pressure-applying hydrautic cylinder can be used for driving said pressurizing plate to circumferentially apply pressure to the pipe material, and the axial propulsion hydraulic cylinder can be used for driving pressing die to apply tangential force to the pipe material, the bending die is fixed on the bending machine working table by means of bending centre, and bending die, pressing die and clamping die respectively have the groove fit with the outer diameter of said pipe material, the pressurizing plate is connected with the pressing die by means of dovelail groove, and the pressurizing plate also is connected with the bending machine working table by means of dovetail groove.

A segmented gripper is provided, having two arms (2;3) which are operated for closing and opening movement in an operational plane. The arms are flexible in the way of a finger; i.e. the geometry is variable to adapt to the external shape of the article to be gripped. This is accomplished by providing a structure for the arms, wherein an outer row of pivotally connected links (6) is interconnected with an inner row of pivotally connected links (7), the interconnecting elements (8) being pivotally attached to the link connecting points of each row of links. The lengths of the interconnecting elements are successively decreasing towards the free end of each arm, so that the arm displays a claw-like configuration. The arms are pivotally attached on a support, so that when an actuating force is applied tangentially to the outer row of links, the arms are operated for a closing motion. When the exterior of an article is engaged by any of the inner links, continued tangential force causes the inner row of links to bend about the corresponding link connection point, the outer links peripherally overrunning the inner links by rotation of the interconnecting elements about the attachment points (9,10,11).

The invention discloses a tile laying device and a tile laying robot. The tile laying device comprises a knocking mechanism, wherein the knocking mechanism comprises a flexible knocking part, a knocking driving part and an elastic element, the knocking driving part is arranged to be capable of driving the flexible striking part to stretch out and draw back to vertically knocking tiles laid on a to-be-operated surface, and the elastic element is arranged between the knocking driving part and the flexible knocking part and is used for providing elastic restoring force for the flexible knocking part when the soft striking part is used for knocking the ceramic tiles. When the striking driving piece of the tile laying device drives the flexible striking piece to knock the tiles, elastic restoring force is provided for buffering through the elastic element, so that the tiles can be prevented from being knocked and damaged, and the phenomenon of hollowing of the tiles is reduced; and in addition, due to the fact that the flexible striking piece vertically knocks the tiles, the phenomenon that tangential force is applied to the tiles, so that plane displacement of the tiles is caused is avoided, the height difference among the tiles can be effectively guaranteed particularly when the tiles are laid on the wall surface, and the tile laying quality is improved.

The cardioid cycle engine utilizes a centrally located output shaft which carries an orbiting crankshaft for each cylinder. The journals of the orbiting crankshafts trace a heart shaped pattern, hence the term "cardioid" cycle. The crankshafts are geared to rotate within the revolving output shaft in the same direction and at the same angular velocity as the output shaft. In the preferred embodiments the offsets of the two shafts are adjusted so that they are additive in the second quadrant of output shaft rotation. This configuration produces four strokes, variable in length and duration, in each 360° of output shaft rotation. The expansion stroke can exceed twice the intake stroke in length, and TDC can occur when the output shaft is well past the normal TDC position, allowing tangential force on the shaft when cylinder pressure is highest. Compression ratios can be varied over the full useable range while the engine is operating. When used as an engine, fuel efficiency and torque are increased, and when used as a compressor the peak torque loads are reduced.

The invention discloses a test method and a test device for torsional composite fretting friction wear. The method comprises the following steps that: a, an upper test piece is clamped on an upper fixture connected with a six-axis force/moment sensor, and a lower test piece is clamped by a lower fixture, wherein the lower fixture is fixed on an inclined rotary motor (13) shaft; b, a data acquisition control system controls the upper fixture and the upper test piece to move up and down and move left and right to make the upper fixture and the upper test piece contact and keep a set normal load Fn, and the data acquisition control system controls a rotary motor and the lower test piece to rotate in set parameters; and c, the six-axis force/moment sensor measures a tangential force, namely a frictional force Ft, the frictional force Ft is sent to the data acquisition control system, and the curve of the frictional force Ft and a rotary angle displacement amplitude theta is obtained through analysis to represent dynamic characteristics of torsional composite fretting. By the method, composite fretting damage of a component in complex stress is more really simulated; the precision of control and test is high; the repeatability of experimental data is good; and the automation degree is high.

The invention relates to a small-displacement reciprocating rolling friction abrasion test device. A plane sample clamp is fixedly connected below a cross beam of a hydraulic friction test machine by a tangential force sensor; a rolling sample clamp is positioned at the right side of the plane sample clamp and is fixed on a vertical column of a support frame; a bottom plate of the clamp support frame is connected on a hydraulic piston of the hydraulic friction test machine; the right side of the clamp support frame is provided with a normal force; a screw at the right side of the normal force sensor is connected on a support nut by threads, and the end part of the screw is connected with a rotating disc; the support nut is fixed on a work platform surface of the hydraulic friction test machine by a support seat; and a U-shaped connecting piece at the left side of the normal force sensor is sheathed on the vertical column of the clamp support frame. The small-displacement reciprocating rolling friction abrasion test device can simulate the friction abrasion between a plane sample and a rolling body more really and reliably, is convenient to microscopically analyze the test result, and has high degree of automation, simple and convenient operation, high accuracy of control and test and good repeatability of test data.