Abstract: A compact assembly for accurately measuring the air flow in an air intake duct of an internal combustion engine that is easy to manufacture and maintain. The assembly includes a housing with an inlet opening, an outlet opening, a channel with an inner wall defining a predetermined cross-sectional area and a closure member that is movably mounted in the channel between a closed and opened position. A first annular chamber is situated upstream from the closure member and a second annular chamber is placed downstream of the closure member. Each chamber has an inner chamber wall with a number of apertures that are in fluid communication with the channel. A first pressure sensor is connected to the first chamber for measuring a pressure, and a second pressure sensor is connected to the first chamber and the second chamber for measuring a difference in pressure.

Abstract: A capacitive sensor for characterizing force or torque includes a first plurality of non-patterned conductive regions and a first plurality of patterned conductive regions, and a second plurality of non-patterned conductive regions and a second plurality of patterned conductive regions. The first and second pluralities of non-patterned conductive regions are facing and the first and second pluralities of patterned conductive regions are facing.

Abstract: Provided is a construction machine including a hydraulic system having a hydraulic pump, and a first hydraulic actuator and a second hydraulic actuator which are driven by hydraulic oil supplied from the hydraulic pump. The construction machine includes a first flow rate detector that detects a flow rate of drain hydraulic oil discharged from the first hydraulic actuator, a second flow rate detector that detects a flow rate of drain hydraulic oil discharged from the second hydraulic actuator, and an abnormality determination unit that determines abnormality of the first hydraulic actuator, based on a detection signal from the first flow rate detector, and determines abnormality of the second hydraulic actuator, based on a detection signal from the second flow rate detector. The first flow rate detector and the second flow rate detector each have a moving body.

Abstract: The present invention relates to alternating stress fatigue testing equipment. The alternating stress fatigue testing equipment includes a pedestal on which linear guide rails are arranged; a deflection loading device which is arranged on the pedestal and configured to, in response to a clamped to-be-measured object being driven to slide to a first position, enable the to-be-measured object to be bent to a target degree and keep the to-be-measured object after the to-be-measured object is bent to the target degree, wherein the deflection loading device is rotatably connected to the to-be-measured object; two hinged shaft supports which are arranged on the linear guide rails, wherein the hinged shaft supports are symmetrically arranged about a longitudinal center line of the deflection loading device, connected to both ends of the to-be-measured object respectively, and configured to be adjusted obliquely to adapt to the bending of the to-be-measured object to the target degree.

Abstract: A rock true triaxial dynamic compression-shear test equipment, and method under deep complex structure conditions, includes a counterforce framework, a pressure chamber, a base platform and four actuators. A pressure chamber transfer track is arranged on the base platform, and a pressure chamber transfer slipway is arranged on the tracks. The pressure chamber is a split structure. A pressure chamber base is located on the pressure chamber transfer slipway, and a pressure chamber barrel is provided with a pressure chamber barrel lift type bearing table and a pressure chamber barrel hoisting mechanism. The pressure chamber is provided with pressure chamber barrel and base packaging fixtures.

Abstract: A fiber optic temperature sensor, a sensing head structure, and a manufacturing method are provided. The fiber optic temperature sensor includes a broad spectrum light source, a first fiber optic coupler, a spectrometer, a first sensing interferometer, and a second sensing interferometer. The first sensing interferometer and the second sensing interferometer have opposite temperature responses. A first free spectral range corresponding to the first sensing interferometer is close to but not equal to a second free spectral range corresponding to the second sensing interferometer. In the fiber optic temperature sensor, two sensing interferometers both sensitive to temperature are used, and the two sensing interferometers have opposite temperature responses, thereby achieving an enhanced vernier effect, and improving the sensitivity of temperature measurement.

Abstract: A model selection method for a hydraulic support includes: determining a surrounding rock-support mutual feedback equilibrium curve under a first equivalent in-situ stress and a surrounding rock-support mutual feedback equilibrium curve under a second equivalent in-situ stress, according to the first equivalent in-situ stress, the second equivalent in-situ stress, a stress of a fracture zone on a softening zone under the first equivalent in-situ stress, and a stress of the fracture zone on the softening zone under the second equivalent in-situ stress; determining a support strength of a to-be-selected hydraulic support on the surrounding rock and a minimum expansion and contraction quantity required by a movable column according to the equilibrium curves; determining the residual burst energy that needs to be absorbed by the hydraulic support; and determining the hydraulic support matched with roadway.

Abstract: An example hinged device flexible substrate testing system includes: a first plate comprising a first surface configured to hold stationary a first side of a hinged device under test; a second plate comprising a second surface configured to hold a second side of the hinged device under test; a first cam follower coupled to the second plate; a first drive arm configured to move the first cam follower to cause the second plate to rotate about a hinge pivot axis of the hinged device under test; an actuator configured to rotate the drive arm; and a load cell configured to measure loads on the first plate while the actuator moves the second plate.

Abstract: A strain sensor comprising a conductive member having a plurality of elements arranged adjacent to one another, and a non-conductive and elastically deformable material encapsulating the conductive member, wherein, in an equilibrium state, compressive forces cause at least one of the plurality of elements to contact at least a portion of an adjacent element, and wherein, when a strain is applied, a resulting elastic deformation causes at least one of the plurality of elements to space apart from an adjacent element such that the contacted portion decreases or is eliminated. A multi-axis force sensor comprising a sensing array comprising at least two planar sensors arranged radially on a planar substrate in antagonistic pairs, and a compressible member positioned between the substrate and a central portion of the sensing array, the compressible member acting to displace the central portion of the sensing array away from the substrate.

Abstract: A hybrid experimental-numerical approach is disclosed to determine the Mixed Mode (I/III) dynamic fracture initiation toughness of engineering materials. Cylindrical Aluminum alloy specimens with a V-notch spiral crack on the surface at spiral angles of 0°, 11.25°, 22.5°, 33.75°, and 45° are subjected to dynamic torsion load using torsional Hopkinson bar apparatus. The torque applied to the specimen at the onset of fracture is measured through strain gages attached to the incident and transmitter bars. A stereo digital image correlation is performed to measure the full-field deformation, and the crack mouth opening displacement as a function of loading time and is used to estimate the time at which the crack initiation is started. The dynamic stress intensity factors are extracted numerically based on the dynamic interaction integral method using Abaqus. The Mode-I (KId), Mode-III (KIIId), and Mixed Mode (K(I/III)d) dynamic initiation toughness is presented as a function of spiral angles and loading rate.

Abstract: A tower monitoring system for monitoring a remote tower for structural evaluation and analysis. The tower monitoring system includes a sensor unit that takes tower data readings that include displacement readings. The sensor unit provides the tower data readings to a ground control unit near the tower. A remote server is in communication with the ground control unit and includes a secondary source of data, such as historical data of the tower, current data or historic data from nearby towers, and nearby weather and geological data. The monitoring system implements a modal analysis to determine contributions to the displacement readings and alarms an operator if the modal readings indicate structural stress beyond a predetermined threshold. Data is saved and can be used in a trend analysis to review any changes in the tower displacement readings over a period of time.

Abstract: A load control method and a load control system of an indenter based on fuzzy predictive control, are provided. The method includes acquiring an actual measured force value of a sensor and an expected force value of the nth cycle in the loading stage; calculating a first error and a change rate; establishing and optimizing a fuzzy predictive controller; determining movement steps of a motor in the loading stage; acquiring the actual measured value of the sensor and an expected force value of the nth cycle in the full load stage; controlling the movement of the motor; acquiring the actual measured force value of the sensor and an expected force value of the nth cycle in the unloading stage; calculating a third error and a change rate; and determining the movement steps of the motor in the unloading stage.

Abstract: Disclosed herein are systems and methods for characterizing poroelastic materials. Indentation of a poroelastic solid by a spherical-tip tool is analyzed within the framework of Biot's theory. The present disclosure provides the response of the indentation force as well as the field variables as functions of time when the rigid indenter is loaded instantaneously to a fixed depth. Some embodiments of the present disclosure consider the particular case when the surface of the semi-infinite domain is permeable and under a drained condition. Compressibility of both the fluid and solid phases is taken into account. The solution procedure based on the McNamee-Gibson displacement function method is adopted.

Abstract: A strain gauge includes a flexible substrate, and a resistor formed of material containing at least one from among chromium and nickel, on or above the substrate. The resistor includes a first layer that is a lowermost layer; and a second layer that is a surface layer laminated on or above the first layer. The second layer is a layer having a higher density than the first layer. The first layer has a first surface provided on a side where the flexible resin substrate is situated, the functional layer being laminated on the first surface. The first layer has a second surface on which the second layer is laminated.

Abstract: Spatially-distributed resonant MEMS sensors are coordinated to generate frequency-modulated signals indicative of regional contact forces, ambient conditions and/or environmental composition.

Abstract: A bending test apparatus includes a jig including first to third supporting members arranged in a first direction; a shaft member including a first shaft, a second shaft, and a third shaft extending in a second direction intersecting the first direction and respectively connected to the first to third supporting members; a driving member connected to the first shaft and providing a rotation force to the first shaft; a sliding member including a first slider and a second slider respectively connected to the second shaft and the third shaft; and a rail member extending in the first direction and guiding movements of the first slider and the second slider. When the first shaft rotates the first supporting member in a first rotation direction, the second and third supporting members rotate in a second rotation direction opposite to the first rotation direction.

Abstract: A monitoring system is disclosed herein that is configured to utilize a distributed sensing system to monitor both a cable and cable accessories included within a cable circuit. In various embodiments, the monitoring system may include a distributed sensing system and one or more cable accessory wrap assemblies. The distributed sensing system may include a distributed sensing fiber following (or integrated into) the cable and connected to a cable accessory wrap assembly for each of the one or more cable accessories in-line with cable. In various embodiments, each cable accessory wrap assembly may comprise a cable wrap embedded with a distributed sensing fiber. The distributing sensing fiber of a cable accessory wrap assembly may be configured to provide measurements to distributed sensing system indicating that an anomaly event occurred at a given cable accessory.

Abstract: A handheld quality inspection tool for projection welded components and method for utilizing the same is disclosed. The handheld quality inspection tool includes an elongated hollow tube, a spring support, a spring member, a plunger, and a handle. The elongated hollow tube defines a slot. The spring support is connected to an end portion of the elongated tube. The spring member is disposed within the elongated hollow tube and connected to the spring support. The plunger is disposed in the elongated hollow tube and connected to the spring member opposite the spring support. The handle is connected to the plunger and protrudes from the elongated hollow tube through the slot and is translatable along the slot to move the plunger and compress the spring member. Upon release of the handle, the compressed spring member propels the plunger to apply an impact force to a projection welded component.

Abstract: In a device for controlling the temperature of a test sample in a measuring device for measuring material properties of the test sample, comprising a measuring cell for receiving the test sample, at least one temperature controlling element, and a thermal storage element coupled to the temperature controlling element to transfer heat, wherein means are provided for changing the thermal resistance between the thermal storage element and the measuring cell in order to selectively couple or decouple the thermal storage element and the measuring cell in terms of heat transfer, the ratio of the thermal capacity of the thermal storage element to the thermal capacity of the measuring cell is greater than 1:1, preferably at least 2:1, preferably at least 5:1.

Abstract: The disclosure is related to methods for testing and/or validating drill pipe and threaded and coupled connectors for use in subsea intervention system riser applications (open-water and through-riser). The methods are novel applications for testing and/or validating drill pipe and threaded and coupled connections that conform to Annex E of API 17G.