225 results about "Force displacement" patented technology

A low travel switch assembly and systems and methods for using the same are disclosed. The low travel dome may include a domed surface having upper and lower portions, and a set of tuning members integrated within the domed surface between the upper and lower portions. The tuning members may be operative to control a force-displacement curve characteristic of the low travel dome.

The invention discloses a whisker sensor for perceiving three-dimensional force displacement and a three-dimensional force of a contact point. The whisker sensor is installed on a robot body, the whisker sensor comprises a cross elastic beam (1), strain gauges (8), a flexible whisker (3), a contact ball (4), a spring (7) and a sleeve (5), wherein the cross elastic beam (1) is of a hollow structure and comprises four elastic beams (2) arranged inside, a wheel rim and four wheel rim screw holes (6), the four elastic beams (2) are intersected in pairs to form an angle of 90 degrees and thus form a cross shape, and the upper surface, the lower surface, the left side surface and the right side surface are each provided with a strain gauge (8) in an adhesive mode; the four wheel rim screw holes (6) are symmetrically distributed at the upper surface of the cross elastic beam (1) for fixing the position of the sensor; and the flexible whisker (3) is installed at the center of the cross elastic beam (1). According to the invention, accurate positioning of a target object can be realized.

The invention provides a finite element analysis method for formula racing car frames, belongs to the technical field of computer aided engineering, and aims at solving the problem that existing racing car frame optimization and analysis are bad in correctness and long in design period. The finite element analysis method comprises the following steps of: A, constructing a three-dimensional model and carrying out meshing to convert the three-dimensional model into a finite element model; B, applying boundary conditions according to each working condition, carrying out finite element analysis and calculation on frame bending rigidity under each working condition, and comparing the analysis result with material bending strength to carry out structure optimization; C, respectively applying forced displacement in opposite directions on two sides of the car frame, carrying out finite element analysis and calculation to obtain torsional rigidity of the car frame, and carrying out structure optimization according to the analysis result; and D, analyzing and comparing whether a fixed frequency of each order modal of the car frame is different from an external main excitation frequency or not, and carrying out structure optimization according to the result. According to the method, the correctness of optimization and analysis is improved, the expenditure is decreased and the design period is shortened.

The invention discloses a force-displacement hybrid control motorcycle frame fatigue test method which comprises the following steps that 1), finite element analysis is performed on a motorcycle frame, and a road load spectrum during actual running is acquired in a durability test road; 2), the road load spectrum is subjected to analysis processing and validity check, and a concentrated load spectrum is obtained; 3), a motorcycle frame assembly is mounted on a test system, and a frequency response function and a coherence function are calculated; 4), a frequency response function for calculating an excitation driving signal is constructed; and 5), a corresponding strain signal and an acceleration signal are extracted from the concentrated load spectrum, and driving signals of two vibration exciters are calculated. According to the test method, a force-displacement hybrid control mode is adopted, so that an actual stress situation of the motorcycle frame is completely matched; decoupling of a multi-axial and multi-excitation test is achieved; very high simulation precision can be obtained; and simulation points are found out by coherence analysis, and the load spectrum is concentrated, so that a test period is shortened greatly.

A new type of exercise machine for full body and cardiovascular fitness enthusiasts. It incorporates the properties of tension physics with applied tension force displacement wherein the users' torso is attached to a moving part that tilts and is centralized along a path of lease resistance (B) and the users' hands and feet are fixed at point A and point C of that path. Having the users' hands at point (A) attached to a cable that passes through the same central point (B) by why of a pulley and proceeding to the opposite foot; point (C). The user will then, in a simulated swim stroke assert force on both ends of the cable thus moving the entire body to the right or to the left. During this movement the user has at his/her discretion the amount of resistance applied between the hands and the feet.

An electromagnetic actuator is provided that comprises a housing, a solenoid coil, and an armature. The armature can move between a first position proximate a portion of the housing and a second position distal of the portion of the housing. The armature and the portion of the housing define a first gap and an extension member extends in an axial direction into the first gap, thereby defining a second gap. The width of the second gap is less than the width of the first gap. The length and shape of the extension member may be varied to produce increased initial magnetic force from the solenoid coil on the armature. The length and shape of the extension member may also be varied to produce a desired armature force-displacement curve over the stroke of the actuator.

The invention relates to a test sample and method for testing performance parameters of a pipe under the complex stress state. A common uniaxial tension arc-shaped test sample is processed into an arc-shaped test sample with an elliptical hole. The center line of a long shaft of the elliptical hole is in superposition with a center line in the length direction of the uniaxial tension arc-shaped test sample; and the center of the circle of the elliptical hole is in superposition with the center of the shape of the arc-shaped tension test sample with the elliptical hole. Two sections of pipe compressed test samples are cut out along the axial direction of the pipe to be tested. The verticality of the cross section of each pipe compressed test sample to the axial line of the pipe is 0.08-0.1, and the degree of roughness of the cross section of each pipe compressed test sample is 0.8-0.2. The tension testing is performed on the arc-shaped tension test sample with the elliptical hole, the axial compression testing is performed on the pipe compressed test samples, the lateral compression testing is performed on the pipe compressed test samples and reverse engineering is further performed on obtained force-displacement data, thereby testing the performance parameters of the pipe under the complex stress state.By adopting the whole set of test sample for testing the performance parameters of the pipe under the complex stress state and the testing method, the testing precision and the efficiency of the performance parameters of the pipe are improved.

A displaceable valved stopper is disclosed which partitions a conventional syringe into proximal and distal chambers to provide a multi-chamber, mixing syringe assembly. Also the valved stopper and a valve assembly are disclosed for use in a single conventional syringe to provide dual chamber mixing plus a disparate and sequentially dispensed flush. Incorporated in the valve assembly is another valved stopper and a separator which filters out gas from liquid being dispensed through the valve assembly. Each valved stopper is made as a single molded part which may be made from basic syringe plunger material. Also, each valved stopper may have a bi-state valve (e.g. a domed, slit valve). The separator is a single molded part which may be molded from basic syringe material. Each valve is actuated to a different state by differential pressure of a force greater than the associated valved stopper displacement force. A syringe plunger communicates through fluid in a more proximal chamber to force displacement of the valved stopper and valve assembly for both mixing and dispensing.

The invention relates to a pendulum bob type shearing-resistant impact testing machine and a testing method thereof, belonging to the technical field of concrete material testing. The pendulum bob type shearing-resistant impact testing machine can achieve accurate shearing-resistant impact testing result and wide application range, is convenient to carry, and can avoid danger to operators. The pendulum bob type shearing-resistant impact testing machine comprises a working shaft, a base, a support, a connecting frame, a pendulum bob, a pendulum rod, a graduated dial and a pointer; the testing method comprises the following steps: measuring the compressive strength of a test piece; horizontally placing the test piece on the support and recording the initial scale value of the pointer on the graduated dial; carrying out pendulum bob shearing-resistant impact on the front surface of the test piece; recording the ending scale value of the pointer on the graduated dial to obtain the difference of the initial scale value and the ending scale value; measuring a shearing-resistant impact force-displacement curve to obtain the shearing-resistant impact energy of the test piece; corresponding the shearing-resistant impact energy of the test piece to the difference of the initial value and the ending value.

The invention belongs to the technical field of strength tests, and relates to a three-slideway wing flap test method of the strength test under the condition that the wings deform. By utilizing the relative displacement theory, the three-slideway wing flap test method largely reduces the design scale of the experiment, reduces test risks, largely improves the accuracy of the experiment design through the method that forced displacement and pneumatic loads are simultaneously loaded stage by stage, and fully tests the structures like wing flaps.

A passive/reactive device protects a Payload from injury or damage due to the shock caused by impact or explosion. When the vehicle or structure mounting the Payload receives a shock pulse, the invention limits the acceleration transmitted from the vehicle or structure to the Payload to an acceptably low, user-adjustable level which is substantially constant or is some other user-adjustable force-displacement function. The invention is capable of doing so even when the peak magnitude of the imposed shock is on the order of thousands of G's, with a rise time to peak on the order of microseconds. The invention can be embodied to operate passively, without any external source of power, sensor system, or CPU, although they can be added to improve certain usability features. The invention also absorbs or dissipates the shock energy in substantially the minimum distance possible without exceeding the user-defined acceleration limit on the Payload. The invention can also react when a shock-producing impact is imminent by repositioning the Payload away from the impact site. The Payload can be a person or persons, or shock-vulnerable equipment. The shock can be created in a number of ways, including an explosion, an impact or collision, the slamming on high-performance boats and some off-road vehicles, earthquake, or even intentional shocks on an amusement thrill ride. The ability of the invention to protect against shock is limited only by its ability to absorb or dissipate the energy of the shock pulse on the Payload. The device can be implemented to protect against shock from any arbitrary direction. The name Shock-Limiting Interface, Compact (SLIC) is coined for this invention.

A device for testing door close force of automobile is controlled by computer, it applies S-shape strain type of force test transducer and capacity type of displacement transducer to measure force and displacement as well as applies serial interface to input force displacement signal to portable computer for realizing real time data collection and communication . The device not only can realize test of door close force but also can realize test of door close displacement.

A snowmobile suspension system connected between a skid frame positioned below a chassis of a snowmobile. A limiter strap adjustment mechanism is connected between the chassis and the at least one limiter strap and selectively adjusts the length of the at least one limiter strap. A coupling arm adjustment mechanism is connected between the chassis and at least one coupling arm and selectively adjusts the length of the at least one coupling arm. A linear force device adjustment mechanism is connected between the chassis and the linear force device for adjusting the length and angle of the linear force device relative to the at least one rear arm resulting in control of the force displacement characteristics of the at least one rear arm.

The invention discloses a method for testing the buffer performance of a two-dimensional porous material under the high-speed impact condition. The method comprises the steps of carrying out buffer performance testing on the two-dimensional porous material to obtain a corresponding impact force displacement curve, standardizing the impact force displacement curve to obtain a corresponding standardized stress strain curve, and establishing and calculating buffer performance evaluation indexes such as optimal unit volume energy absorption, optimal specific energy absorption, impact force efficiency and a minimal dynamic buffer coefficient, so as to realize the testing of the dynamic buffer performance of the two-dimensional porous material under the high-speed impact load condition. According to the method, the problem that the buffer performance of the two-dimensional porous material under the high-speed impact load condition cannot be researched by virtue of an existing method is solved, samples of different thickness do not need to be tested, an evaluation method is simple, the load condition is similar to an actual impact load and does not influenced by the fluctuation of a curve amplitude value, and the method can be used for researching the influences of factors such as impact speed, structure parameters and unit forms to the buffer performance of the two-dimensional porous material.

The invention discloses a device for automatically calibrating clamp rigidity and an application method thereof, and belongs to the field of machinery. The device for automatically calibrating clamp rigidity is used for fast and highly precise clamp rigidity calibration. In the process of calibrating the clamp rigidity, firstly an equilibrium position is adjusted, and a force sensor and a displacement sensor return to a home position; an industrial control computer sends out a command to control a stepping motor to drive a retarder to rotate, and to drive the entire screw nut slide table to move along a straight line through a screw nut pair; the displacement of the screw nut slide table is stably transmitted to a loading head through the action of a spring, and then the clamp is deformed;a collecting device synchronously collects signals from the force sensor and the displacement sensor and outputs the signals to the industrial control computer; the industrial control computer controls the stepping motor to stop rotating after the signal from the force sensor reaches a set value; and the stepping motor reverses again to a zero point when the stepping motor is reversed to a set reversed value. The device for automatically calibrating clamp rigidity and an application method thereof can obtain a force-displacement curve of the entire process through one-time clamping only, andobtain the rigidity of the clamp under a tension and compression state. The rigidity test process is smooth and continuous, and the rigidity measurement is accurate.

The invention discloses a method of load shedding of a floating wind turbine generator system based on semi-active structure control of a magneto rheological damper. The method includes the following steps: (1) analyzing the structure of the magneto rheological damper, obtaining a force-displacement relationship of the magneto rheological damper; (2) establishing an equation of motion of a multi-degree of freedom system of an offshore floating wind turbine generator system which is configured with the magneto rheological damper, and establishing equations of motion of the wind turbine generator system and the magneto rheological damper; (3) controlling the magneto rheological damper through a LQR controller and a Fuzzy controller so as to reduce the pitch angle of the floating wind turbine generator system and the longitudinal displacement of a nacelle. According to the invention, the method overcomes the defects of passive control and active control in structural control of a damper, requires less extra energy, requires simple apparatus and is not less susceptible to stability loss, can effectively reduce total load of the floating wind turbine generator system, guarantees stability of a platform, and further increases service life and energy quality of output electricity of a wind turbine generator.

The invention discloses a device and a method for measuring the rigidity of a magnetic suspension bearing. The device mainly comprises three precise electronic control displacement tables, a turn table, three laser displacement sensors, a six-degree of freedom force/moment sensor, a tool converter, a mounting converter, a right angle fixing frame, a reference measuring plane and the magnetic suspension bearing, wherein the three precise electronic control displacement tables are controlled through a personal computer (PC); a stator of the magnetic suspension bearing is enabled to move in a certain direction in the horizontal plane, and a rotor of the magnetic suspension bearing is enabled to move in a vertical direction; force-displacement data is obtained through measuring the force borne by the rotor at a certain steeping point and the displacement of the stator/rotor relative to an equilibrium point for the time being; and the data is relatively processed through a selected fitting model, and then the rigidity in different positions in the direction is obtained. The device has the advantages of high precision, flexible measurement, high automation degree, good maneuverability and the like.

Retention of position and clamping of components is ideally performed with an engagement arrangement which is reconfigurabie. Magnetorheological (MR) fluids have been utilised for reconfigurabie engagement arrangements but typically require powerful electromagnets to activate the MR fluid. By providing enclosed chambers with a constriction in the form of a passage (30) between a reservoir portion (31) of the chamber and an engagement portion (32) of the chamber it is possible to utilise smaller permanent magnets (7) acting upon a smaller volume of MR fluid in the passage. In such circumstances initial positioning of engagement elements (9) is provided through forced displacement in the form of a plunger or pin (11) and then retention of the engagement element position achieved through positioning a magnetic field across and about a passage (30) to create an effective block retaining MR fluid volume and therefore presentation of the engagement element (9). In order to achieve such performance MR fluids which have an appropriate performance and durability are necessary. In such circumstances in accordance with other aspects of the present invention particular magnetorheological fluids are also described.

The invention provides a vertical force measuring type bridge support and a force measuring method. The vertical force measuring type bridge support comprises an upper support, a seat board, a bottombasin, a displacement amplification device and a displacement sensor; and the upper part of the support bears force-displacement conversion. After the support bears a vertical force, the center of a lower seat board generates a downward displacement; through the displacement amplification device, the displacement is amplified and led out of the support; through a load test, a relation between thevertical load force of the support and the reading of a displacement sensor is calibrated to realize purposes of force-displacement conversion and an easily detached and changed displacement measuringelement.

A low friction hanger system for reducing the lateral force required to move a hanger on a rod. The system includes a friction reducing element located between a hanger hook of the hanger and a supporting rod. The friction reducing element can include a roller or low friction material either integral with the hanger hook or retrofitted thereto. The friction reducing element can also include low friction material on the rod which is either integral therewith or retrofitted thereto. Optionally, lateral force displacement magnets or laterally extending arms will aid in the lateral displacement the hanger relative to other hangers.