141results about "Force measurement by permanent gauge deformation" patented technology

A method of constructing a sensor includes depositing a first material in a predetermined arrangement to form a structure. The depositing results in at least one void occurring within the structure. The method further includes depositing a second material within the voids. The second material may have electrical properties that vary according to deformation of the second material. The method also includes providing electrical access to the second material to enable observation of the one or more electrical properties. A sensor includes a structure that has one or more voids distributed within the structure. The sensor also includes a material deposited within the one or more voids. The material may be characterized by one or more electrical properties such as piezoresistivity. The sensor includes a first contact electrically coupled to a first location on the material, and a second contact electrically coupled to a second location on the material.

Apparatus are provided for sensor assemblies and related medical devices. An embodiment of a sensor assembly includes a beam and a sensing element disposed on the beam. The sensor assembly also includes a structure to prevent deflection of the beam when a force applied to the sensor assembly is greater than a threshold value.

A sensor device for measuring frequency and amplitude of a varying force signal is provided. The sensor device comprises a sensing element defined by a plurality of even numbered planar segments symmetrically disposed about a central axis, a protective housing for housing, an interface element comprising a pick up member, a planar mechanical actuator, a transfer member adapted to receive varying signals from the pick up, amplify the signals picked up and transfer the amplified signals to the said mechanical actuator; and leads for transmitting said output signals outside the sensing device for processing.

A force sensor for measuring force and/or torque about a single axis or multiple axes is rugged, inexpensive and can be fabricated over a wide range of sizes. The force sensor includes first and second members that are coupled to each other by an elastomeric flexure that allows at least one member to be movable with respect to the other member when a force is applied. The force sensor includes a transmitting coil or printed circuit trace and a receiving coil or printed circuit trace. In one embodiment, the transmitting and receiving coils are formed on different ones of the first and second members. In another embodiment, the transmitting and receiving coils are formed on the same member and the other member is formed as a shading plate. A signal applied to the transmitting coil induces a signal in the receiving coil that represents the force applied.

A mechanical load bearing indicator producing signals to a user when the user applies more than selected amounts of load between an extremity of the use and a surface. The indicator has a base plate adapted to establish a frame of reference with the surface, a load plate mounted for movement toward and away from the base plate and adapted to receive loads from the user's extremity, and at least two snap domes mechanically engaged between the base plate and the load plate for generating two signals when more than two different respective loads are applied to the load plate by the extremity. The domes are either in series between the plates or are together in a dual dome containing both, or are one or more stacks of domes which individually collapse under incremental loads which are added together to form the selected lower and higher loads.

A spin-pull blind insert tool utilizes a control system that generates a stop signal based on the relationship between the force values and the motion values derived from the action of the tool mandrel. The improved control system utilizes the shape of the force-deformation curve and not just a given pre-set force value or pull distance. Hence, the control system of the present invention does not require any set-up for changes in panel thickness unless the mandrel is also changed to install a different thread size. This control system develops a force-deformation curve as the fastener is being installed. The stop signal is generated when a pre-set deformation point has been exceeded and the shape of the force curve can be characterized by either of two types. For either type, an algorithm is followed which establishes an optimum stopping point for the installation tool regardless of the panel thickness into which the blind rivet is being installed.

To provide a bearing device for a wheel, in which a preload control is easy and a uniform amount of preload can be applied with a bearing seal being mounted, the bearing device for the wheel includes an outer member, an inner member and double rows of rolling elements interposed between the outer member and the inner member. The outer member has a flange on an outer periphery thereof and also has an inner periphery formed with two rolling surfaces. The inner member is formed with rolling surfaces opposed to the rolling surfaces of the outer member. The double rows of the rolling elements are interposed between the rolling surfaces of the outer member and the inner member. A sensor for detecting the amount of preload of the bearing is provided in one of the outer and inner members.

The invention discloses a passive sensor device for measuring shock wave energy based on a combined aluminum honeycomb, which consists of a packaging shell, a driving slide block, a combined aluminumhoneycomb energy absorbing element, a fixed wall stop plate, a moving bolt and a sealing baffle ring. And the driving slide block moves in the packaging shell under the action of the shock wave to compress the combined aluminum honeycomb energy absorbing element, and the combined aluminum honeycomb energy absorbing element generates plastic unrecoverable deformation. The shock wave energy acting on the driving slide block can be obtained by measuring the plastic deformation displacement on the combined aluminum honeycomb energy absorbing element caused by the driving slide block and utilizingthe relationship between the plastic deformation displacement and the absorbed energy. The combined aluminum honeycomb energy absorbing element has the advantages of simple structure, no need of powersupply, convenient arrangement and use, low cost and reusability, and the response sensitivity of the combined aluminum honeycomb energy absorbing element to lower shock waves is high, so that the technical problem that the shock wave energy is difficult to quantitatively test under partial severe environments can be solved.

The present invention is directed to an impact absorption and detection system, including: one or more deflectable arch springs, having at least one leg with proximal and distal ends; and one or more bases, each of the proximal and distal ends attached to a base. Some embodiments may include: a plurality of arch spring assemblies, including: a deflectable arch spring having at least one leg with proximal and distal ends; one or more bases, each of the proximal and distal ends attached to a base; at least one sensor attached to the arch spring assembly; wherein the plurality of arch spring assemblies is configured in a chainmail arrangement and a base of one arch spring assembly is connected with a base of another arch spring assembly; a processor electrically connected to the sensors attached to the plurality of arch spring assemblies; and a data store in communication with the processor.

A method of leveling a polymer pen array includes contacting a pen array with a surface and measuring a total force exerted on the surface by the pen array, the pen array being disposed at a first angle with respect to a first axis of the surface and a second angle with respect to a second axis of the surface; tilting one or both of the pen array and the surface to vary the first and second angles of the pen array with respect to the surface; measuring the total force exerted by the tilted pen array on the surface; and repeating the tilting and measuring steps until a global maximum of the total force exerted on the surface by the pen array is measured, thereby determining first and second angles which correspond to a leveled position of the pen array with respect to the surface.

A force transducer comprises a handle operably connected to a probe having an elongate tip. The force transducer includes a biasing element arranged with respect to the handle, in force transmitting communication with the probe, and a detector operable to detect a degree of force applied between the probe and the handle. The force transducer further includes an actuator operable to exert a force on the biasing element in dependence upon the degree of force detected by the detector so as to cause a predetermined force to be transmitted from the handle to the probe.

The invention provides an internal stress measuring method of an opening plate, belonging to the technical field of measurement. An opening plate is evenly cut into strips via marking benchmark straight lines on the opening plate for releasing the internal stress; the bending deformation of the benchmark straight line, corresponding to each measuring strip, is measured; the internal stress before releasing the stress is calculated according to the bending deformation of each measuring strip, so that the internal stress distribution of the whole opening plate is obtained. Advantageously, under the precondition of satisfying the internal stress measurement precision of the opening plate, sample preparation and measurement can be performed by common workers with conventional cutting tools, ordinary rulers and tapered rulers; and the internal stress of the opening plate is obtained fast by a mathematical model built by the invention. The method of the invention is used in the works of the process optimization of hot-rolling ship plates and opening process optimization of chip plates, and respectively used for measuring the internal stresses of D36 and D32 levels of ship plate opening plates which are 2000 mm in length and 2000 mm in width, so that the internal stress distribution of the ship plate opening plate is obtained accurately, and reliable reference data is provided for the optimization of production process.