116results about "Force measurement using counterbalancing forces" patented technology

An apparatus for measuring tension in guy wire systems wherein the lower end of the guy wire has a thimble adjoined by a connection pin to a yoke or clevis of a turnbuckle shackle bolt connected to an earth anchor. A block assembly is removably received beneath the clevis and a thimble-engaging jaw assembly is removably received on the guy wire above the clevis. The block assembly and jaw assembly are connected at one end by a threaded rod assembly that includes a strain sensor connected with an indicator device, and by a threaded rod at their opposed end. The jaw assembly is drawn downward by adjusting nuts on the threaded rods beneath the block assembly to engage the thimble and move it downward transferring the tension to the threaded rod and threaded rod assembly which is sensed by the strain sensor and indicated by the indicator device.

The invention is a microtype bearing friction moment measurer, belonging to the field of measuring and control technique. And the invention comprises: mechanical part, electrical part and embedded system, where the mechanical part is connected with the input end of the electrical part through lead wires and USB interface, and the input and output ends of the electrical part are connected the input and output ends of the embedded system, respectively. And the invention adopts digital image processing technique, embedding technique and auto control technique to be able to accurately measure friction moment of a microtype bearing. And the measurer has simple structure, operating convenience and high measuring accuracy.

An active micro-force sensor is provided for use on a micromanipulation device. The active micro-force sensor includes a cantilever structure having an actuator layer of piezoelectric material and a sensing layer of piezoelectric material bonded together. When an external force is exerted on the sensor, the sensor deforms and an applied force signal is recorded by the sensing layer. The applied force signal is then fed back to the actuating layer of the sensor via a servoed transfer function or servo controller, so that a counteracting deformation can be generated by the bending moment from the servoed actuating layer to quickly balance the deformation caused by the external micro-force. Once balanced, the sensor beam comes back to straight status and the tip will remain in its equilibrium position, thus the sensor stiffness seems to be virtually improved so that the accurate motion control of the sensor tip can be reached, especially, at the same time, the micro-force can also be obtained by solving the counteracting balance voltage applied to the actuating layer.

Embodiments of the invention relate to a thrust stand and a method of measuring thrust. Embodiments of the invention pertain to a method of calibrating a thrust stand. Embodiments of the subject thrust stand can incorporate a passive eddy current based damper. Specific embodiments of the passive eddy current based damper can function without contact with the balance arm. Further specific embodiments of the passive eddy current based damper can be used in a vacuum. Embodiments can utilize signal analysis techniques to identify and reduce noise. A logarithmic decrement method can be used to calibrate the thrust stand. Force measurements can be made with embodiments of the subject thrust stand for a standard macroscale dielectric barrier discharge (DBD) plasma actuator and / or other thrust producing devices.

Apparatus is used in sensing a measured input. The apparatus includes a capacitor with a capacitance that varies non-linearly in response to the measured input, and a circuitry that derives, from the capacitance, a signal that varies substantially linearly with the measured input. The capacitor includes a first electrode, a second electrode, and a gap defined by a space between the electrode. The circuitry includes an amplifier with a first input terminal in electrical communication with the first electrode, a second input terminal, and an output terminal in electrical communication with the second electrode. The capacitance of the capacitor varies as an inverse of the gap of the capacitor, the gap of the capacitor varies in response to changes in the measured input, and the signal is derived from an output of the amplifier.

The invention provides a micro force measuring device, belongs to the technical field of micro force value calibration and measurement testing, and aims to solve the problems that the structure is complex, the action line of the force cannot be fixed easily, and the cost is high in the prior art. The micro force measuring device comprises an unequal arm balance, a force value replication device, a micro-displacement measuring device and a computer control system, wherein a tray is arranged at a long arm end part of the unequal arm balance; an edge cutter structure is arranged at a short arm end part; the edge cutter structure is connected with the micro-displacement measuring device through the force value replication device; the output end of the micro-displacement measuring device is connected with an insulating rod through a connecting sleeve; and the insulating rod is connected with a threaded hole in an upper end cover of an inner electrode of the force value replication device. According to the micro force measuring device, the force value replication device is used for replicating a micro force value, relative micro displacement of the inner electrode is measured through an improved digital display micrometer, the force value change is changed into the precision capacitance gradient change of an electricity quantity relative to the displacement, balance is formed through a lever structure and a standard weight dead weight force, the structure is simple, and the cost is lower.

A hydraulic lifting and weighing system particularly for refuse collection vehicles and the like and includes means for dynamically weighing garbage. The system includes a hydraulic actuator operable to move a lifting arm and takes two measurements of the pressure of the hydraulic fluid in the system as the arm raises a waste bin whose weight is to be measured. The weight of the bin is calculated by multiplying the pressure by a factor determined by calibration with known weights. Weights are calculated based on the measurements of pressure and the result averaged. The system compensates for variations in hydraulic flow characteristics. The system includes means for compensating for variations in the inclination of the vehicle.

An active micro-force sensor is provided for use on a micromanipulation device. The active micro-force sensor includes a cantilever structure having an actuator layer of piezoelectric material and a sensing layer of piezoelectric material bonded together. When an external force is exerted on the sensor, the sensor deforms and an applied force signal is recorded by the sensing layer. The applied force signal is then fed back to the actuating layer of the sensor via a servoed transfer function or servo controller, so that a counteracting deformation can be generated by the bending moment from the servoed actuating layer to quickly balance the deformation caused by the external micro-force. Once balanced, the sensor beam comes back to straight status and the tip will remain in its equilibrium position, thus the sensor stiffness seems to be virtually improved so that the accurate motion control of the sensor tip can be reached, especially, at the same time, the micro-force can also be obtained by solving the counteracting balance voltage applied to the actuating layer.

An end effector base and a finger unit are formed as separate members, and are disposed with a space therebetween. A force sensor is fixed to a finger base of the finger unit, and is disposed with a space between it and the end effector base. Three supporting members are supported by the end effector base, and are configured to be able to be moved by the driving of a driving unit to a position where they support the force sensor and a position where they are separated from the force sensor and support the finger unit.

The invention discloses an on-line monitoring method for large-scale wind power tower drum structure stress and belongs to the field of structure health monitoring. Since wind power tower drums are large in size and are located in harsh environment, traditional methods for measuring structure stress with strain gages require more strain gages, and the strain gages are not suitable for use in wind power tower drum structure stress monitoring methods due to the fact that the strain gages cannot be located in harsh environment for a long time. According to the on-line monitoring method for large-scale wind power tower drum structure stress, on the basis of the shaking characteristic of a wind power tower drum, shaking is divided into a shaking balance position and shaking amplitude around the balance position, the shaking balance position and the shaking amplitude correspond to mean stress and stress amplitude in alternating stress respectively, and a relationship between shaking and stress is established, so that structure stress of the wind power tower drum can be reflected by monitoring shaking of the wind power tower drum, and the problem that methods for measuring stress with strain gages are limited by structure sizes and work environment of wind power tower drums is solved. Besides, the on-line monitoring method is convenient, practical, and applicable to on-line stress monitoring of large-scale wind power tower drum structures.

The invention provides an axial force testing system of a high-temperature rotor system. The system comprises a rotating shaft (1), a base (2), an electromagnetic device (3), a displacement disc (4),a sensor mounting base (5), a radial bearing (6), a displacement sensor (7), a temperature sensor (8), a current sensor (9), a power amplifier (10), a control system (11) and a PC (12). The high-temperature rotor system axial force test system provided by the invention adopts a non-contact measurement mode, bidirectional axial force can be measured after one-time installation, meanwhile, the testdevice does not introduce extra interference to the rotor system, and the service life is relatively long.

The invention relates to an integrated pressure and temperature sensor. A combined pressure and temperature sensing device includes a sensor port geometry that provides improved contact between a fluid media being measured and a thermistor cavity of the sensor port. The increased contact area provides improved response time and accuracy compared to previously known integrated pressure-temperaturesensors. A temperature sensor element is offset from a pressure sensor element relative to a central axis of the temperature-pressure sensor body / package to facilitate substantially increasing a pressures sensor cavity volume without increasing the overall sensor port diameter. A wire-bondable thermistor support portion facilitates high volume automated production line. The temperature sensing element may be resistance welded to the thermistor support portion in a parallel manufacturing process.

The invention discloses a temperature and pressure integrated sensor based on a friction nano-generator and a sensing method. The measured temperature and pressure are reflected according to the volume change of a liquid friction medium after thermal expansion / contraction and the density of a gas buffer medium after expansion / contraction caused by the pressure difference effect of the liquid friction medium. Based on the coupling effect of the triboelectrification effect and electrostatic induction, the liquid friction medium and a solid friction medium move relatively and generate a frictionelectric signal, and the volume change of the liquid friction medium or the density of the gas buffer medium is determined according to the potential difference or the transferred charge quantity ofa first electrode layer and a second electrode layer so as to obtain the temperature or the pressure of an object to be measured. According to the invention, the temperature and pressure integrated sensing is realized, the temperature and pressure integrated sensor has the advantages of low cost, simple structure, safety, environmental protection, no need of an external power supply for energy supply and the like, a measurement signal is not affected by the ambient air pressure, the resolution is high, and remote real-time transmission can be realized.

The invention provides a lever type pressure sensor. The lever type pressure sensor comprises a lever (3), a pressure receiving component (1) and displacement sensing assemblies (5 and 6), wherein the pressure receiving component is connected to a first end of the lever and drives the first end of the lever to move when being pressed, and the displacement sensing assemblies are connected to a second end, opposite to the first end, of the level and can detect the displacement of the second end of the lever.

The invention relates to a drill hole vector stress sensor for a mine, which is strong, durable, convenient to install and capable of achieving omni-directional vector measurement. The drill hole vector stress sensor for the mine comprises a casing. A core body is arranged in the casing and provided with an integrated circuit module connected with the core body. The core body comprises a balance beam fixing support, and balance beam sensors are fixed on the balance beam fixing support and provided with force measurement nuts. Three balance beam sensors are fixed in a mode with 120-degree included angles formed between the balance beam sensors, and the integrated circuit module comprises two (analog to digital) A / D conversion modules and an electronic compass module which are respectively connected with the balance beam sensors. The casing is made of stainless steel materials. The core body and the integrated circuit module are arranged in the casing, and two ends of the casing are sealed by means of glue injection.

The invention belongs to the fields of machinery and test, and in particular relates to a small force measuring device. The small force measuring device comprises a workbench, a vertical ruler, a silk yarn, a horizontal ruler, a horizontal bracket, a dial needle, a positioning nut and weights, wherein the workbench consists of a horizontal platform, a vertical rod and a suspension arm; one end of the silk yarn is tied to the suspension arm, and the other end of the silk yarn is hung with the weight; the vertical ruler is fixed on the vertical rod of the workbench, and the horizontal ruler is fixedly connected with the horizontal platform of the workbench; one end of the horizontal bracket is used for fixing the fixing part of a measured object, and the other end of the horizontal bracket is provided with a positioning mechanism; and the movable part of the measured object is fixed with the dial needle. The device can measure small force through utilizing a simple principle, is reasonable and reliable in scheme and low in part dependence, does not use precise parts and is low in design and manufacturing cost; the temperature and humidity have small influence on a measurement result, and the device is low in environmental requirements; the device is simple in structure and high in measurement precision; the device is convenient to operate, does not need special training, and does not have special skill requirements, and data are convenient to read; and the device can also be a calibration device of a high-precision force transmission device.

The invention provides a device for measuring a shearing force of a metal part. The device comprises a large bottom plate, wherein a side support plate is connected above the large bottom plate and equipped with a forcemeter; a shaft end of the forcemeter is connected with one end of a working block and the other end of the working block is equipped with a bevel shearing surface and faces to one end of a module to be measured; the working block is fixedly connected with a clamping block and a working support block on a sliding plate which is arranged on a sliding chute on the large bottom plate; the other end of the module to be measured faces to a screw end of a revolving axle; a pushing block, a flange, a revolving support block, a locating block and a rocker arm are sleeved on the revolving axle in sequence from the screw end to a threaded end; the pushing block is fixed by the flange and the bottom of the pushing block is mounted on the sliding plate; and the bottom of the revolving support block is mounted on the sliding plate. The device of the invention has the advantages that the rigidity is good, the bearing is large, the processing is convenient, the cost is saved, the operation is simple, the measuring response speed and accuracy is high, the measurement is accurate, the running is stable and reliable, the direct reading can be achieved, the measuring efficiency is high, and the gap of measuring the shearing force in the weld assembly quality inspection of high-low voltage electrical equipment is filled.

The invention discloses a gravity compound pendulum-based micro force measuring device and a measuring method. In the device, a rotating shaft passes through the gravity compound pendulum and is put on a support, the compound pendulum swings an angle under effects of micro-thrust, low friction exists between the shaft and the pendulum, and thus, the micro-thrust can be sensed; the horizontal microdisplacement of the compound pendulum is measured through micro-distance sensors which are arranged in a vertical differential mode, the swinging angle is indirectly measured, and further through a moment balance relationship, the size of the micro-thrust is inversely deduced. The measuring principle and the method are simple and feasible and can reach the precision of a micro newton level; a clump weight arranged at the top end of the gravity compound pendulum can move vertically, the gravity center and the inertia of the compound pendulum are adjusted, the micro-thrust sensitivity is increased, and the influences of external vibration are reduced; the horizontal displacement of the compound pendulum is measured in a differential mode, and errors brought by environment vibration, toolingand measuring devices can be eliminated; electromagnetic damping can reduce oscillation of the compound pendulum, and influences of a disturbance torque are reduced; and besides, calibration on the micro-thrust can be directly completed through a weight calibration mode, and the operation is simple and convenient.

The invention discloses a device and a method for measuring an unbalanced moment of the bottom surface of a round valve element. The device comprises a divergent type special-shaped pipe, a water tank, a transparent tube, a spring dynamometer, laser sources, the round valve element, a valve element bottom surface additional layer, a high-speed camera and a photographing support. Inner hook rings and the laser sources are uniformly distributed on the outer side of the circular valve element of the device; the spring dynamometer is connected with the inner hook rings and outer hook rings uniformly distributed on the inner wall of the transparent tube; and positioning scales are arranged on the outer wall of the transparent tube. According to the measuring method, the high-speed camera is erected on the photographing support to record an unbalanced state formed by the circular valve element under the impact of water flow in different directions; the scales, corresponding to the laser sources, on the outer wall and a pulling force of the spring dynamometer are read out; and a torque, corresponding to a certain specific symmetry axis, of the circular valve element is calculated. The device is simple in structure and easy to manufacture, and can be widely popularized and applied.

A combined pressure and temperature sensing device includes a sensor port geometry that provides improved contact between a fluid media being measured and a thermistor cavity of the sensor port. The increased contact area provides improved response time and accuracy compared to previously known integrated pressure-temperature sensors. A temperature sensor element is offset from a pressure sensor element relative to a central axis of the temperature-pressure sensor body / package to facilitate substantially increasing a pressures sensor cavity volume without increasing the overall sensor port diameter. A wire-bondable thermistor support portion facilitates high volume automated production line. The temperature sensing element may be resistance welded to the thermistor support portion in a parallel manufacturing process.

Apparatus for use in controlling snoring, including: a sensor system for sensing snoring by a person while sleeping, and a stimulus device effective, when actuated by the sensor system, to apply a stimulus to the person for producing a response tending to interrupt the person's snoring. The stimulus device includes a vibrator and a band for enclosing a body part of the person and for applying a vibration to the body part. Also described is a force or displacement sensor, which includes a housing filled with a liquid having high transmissivity and low attenuation properties with respect to acoustical waves, and an acoustical transmitter and an acoustical receiver carried by opposed walls of the housing spaced from each other to define between them an acoustical transmission channel of the liquid. The housing is deformable by a force such as to change the length of the acoustical transmission channel in accordance with the applied force. A measuring system measures the transit time of an acoustical wave through the acoustical transmission channel to provide a measurement of the applied force.

The invention discloses a traceable pN-scale force value calibration device and method, which is used for calibrating an optical trap binding force of an optical tweezer system. The optical tweezer system applies the optical trap binding force on a microsphere in a sample pool. The device comprises a force value sensing element, a displacement control system, and a free end displacement measurement system, wherein a free end of the force value sensing element is located in the sample pool and applies an action force on the microsphere in the sample pool; the force value sensing element is fixed on the displacement control system; the displacement control system achieves a nanoscale positioning precision for the force value sensing element, controls the force value sensing element to gradually approach the microsphere from a far end, and achieves mutual action between the force value sensing element and the microsphere; and the free end displacement measurement system measures relativedisplacements of the free end of the force value sensing element. The device and method disclosed by the invention has the advantages that the optical trap rigidity need not be obtained through approximate calibration; and errors caused by image distortions during measurement of relative displacements of the microsphere by optical imaging equipment can be avoided.

An apparatus for measuring a deformation stiffness of an article includes a force measuring means configured to measure a force generated in a thickness direction of the article; a thickness measuring means configured to measure a thickness of the article; and a data processor configured to differentiate force with respect to thickness to calculate the deformation stiffness of the article, wherein each of the force and the thickness are a result of a volume change of the article.

The invention belongs to the field of measuring instruments, in particular to a large mechanical force measuring machine. The novel mechanical force measuring machine mainly consists of a machine body, a frame, a weighing sensor set, a power mechanism, a pressurizing mechanism, a compression displacement multiplication mechanism and an operating instrument, wherein the power mechanism is composed of a stepper motor and a cycloidal-pin wheel decelerator and fixed above a base of the machine body; the pressurizing mechanism is composed of a pressurizing screw rod and a screw nut, and a forced direction of the pressurizing mechanism is changed by a force transmission lever; for bringing convenience to calibration work of the force measuring machine, an integrated package-type frame is composed of a frame with four upright posts and the compression displacement multiplication mechanism on a surface of a bearing table; and the displacement of the frame is increased by ten times in comparison with the deformation of a sensor per se by compressing a disc spring in the compression displacement multiplication mechanism to shrink under pressure. In an embodiment of the invention, a measurement precision value can easily reach 1 / 640,000.

The invention discloses a striking-force test fixture for keyboard lines, which is characterized in that an original electromagnetic valve tester is additionally provided with a baffle, and a power supply and an electromagnetic valve are replaced; when the striking-force test fixture for keyboard lines is used, through setting weights, a key point of a keyboard line is subjected to a striking-force lower limit test, then through energizing the electromagnetic valve, an electromagnetic force is produced for carrying out a striking-force upper limit test on the key point of the keyboard line, so that the weights of different weights and the energized voltage can be set and the length of a thick stem part of a spool stem in the electromagnetic valve can be adjusted according to different upper / lower limit requirements of a test point to be tested, thereby meeting the striking-force upper / lower limit test requirements of different test points; the declining height of a test fixture board is controlled through setting the baffle, so that the thin stem part of the spool stem on the electromagnetic valve is accurately positioned to a key point of a keyboard line to be tested; through enlarging the diameter of the thin stem part of the spool stem on the electromagnetic valve and directly pressing the spool stem against a product to be tested so as to directly carry out a striking-force test on the key point of the keyboard line, the bending or deformation of the thin stem part is avoided, and the abrasion caused by the application of a tapered test rubber head and the position change of a measuring center are avoided, thereby improving the measuring precision.

Load-measuring transducers utilizing induced-voltage measurement techniques are described. The wiring patterns of such transducers can be configured with a plurality of moveable gauge portions to reduce errors encountered with eccentricities between the transducer gauges, and are preferably configured to reduce interference errors due to wiring patterns thereof.