6 results about "Transverse strain" patented technology

The utility model discloses a novel three-dimensional force sensor, which comprises an elastic sensor main body with a cylindrical structure, the upper part of the elastic sensor main body is provided with a first annular groove, the lower part of the elastic sensor main body is provided with a second annular groove, and four mounting positions are arranged in the second annular groove; an axial strain gauge is attached to the first annular groove, and three of the four installation positions are each provided with a transverse strain gauge. Thus, axial pressure information is received through the axial strain gauge in the first annular groove, transverse pressure information is received through the three transverse strain gauges, and the application scene of the sensor is improved.

The invention provides a system and a method for calibrating a resistance strain gauge in an extreme low-temperature environment. The system for calibrating the resistance strain gauge in the extreme low-temperature environment comprises a flat-plate-shaped approximately-rectangular test tensile standard part, a low-temperature strain calibration module, a strain measurement module, a strain acquisition module and an extensometer acquisition module. Through the combination of the vertical strain gauges and the transverse strain gauges and the step-by-step verification of room temperature, extreme low temperature and multi-gradient low temperature environments, the deformation measurement precision is greatly improved.

The application discloses a light cable net film airship main gas bag and a manufacturing method. The steps for simulating and analyzing set two-dimensional generatrix and determining the arrangement position of the circumferential reinforcing rib include: starting from the quality point of the fixed maximum cross section circumferential position, obtaining the shape after deformation, and then obtaining the quality point with the maximum transverse strain, which is the obtained arc length position of the circumferential reinforcing rib; the quality point is fixed in the next calculation to continue segmentation until the positions of the set number of circumferential reinforcing ribs are completed. The steps for determining the bulge shape after being jointly constrained by the meridian reinforcing rib and the circumferential reinforcing rib include: according to the reinforcing rib position, the reinforcing rib elastic modulus and the spherical membrane elastic modulus, simulating and calculating the spherical membrane surface, and under the condition that the airship internal and external pressure difference is a set value, the three-dimensional shape of each small bulge. The application solves the problem that it is difficult to design a polyethylene film airship main gas bag.

The present disclosure relates to a bridge sensor optimization layout and response reconstruction method, system and medium, relating to the field of bridges. The method comprises: establishing a finite element model of the bridge; deleting measurement points in the initial sensor layout scheme; calculating load transverse influence lines using the bridge finite element model, reconstructing strain response data of the deleted transverse strain measurement points; reconstructing displacement data of the deleted displacement measurement points and / or acceleration data of the acceleration measurement points based on the relationship between displacement and acceleration; reconstructing strain response data of the deleted longitudinal strain measurement points based on the relationship between strain and displacement, using sensor data of the retained longitudinal strain measurement points and using data of the longitudinal displacement measurement points; constructing the architecture of the BiLSTM neural network model; all sensor data and all reconstructed data are input into the network model, and the network model is used to predict the data of the deleted measurement points. The present disclosure realizes the optimization of the sensor layout while improving the reconstruction accuracy.

The invention provides a multi-dimensional strain field distribution reconstruction method based on a fiber bragg grating, and the method comprises the steps: obtaining original reflection spectrum data generated by the fiber bragg grating under the action of a complex load, and obtaining a smoothed first reflection spectrum through Gaussian filtering and baseline correction processing; extracting a main peak center wavelength drift distance, a secondary peak occurrence number and a spectral width broadening degree from the peak value parameter set to form a spectral shape feature vector reflecting a distortion degree; inputting the spectral shape feature vector into a pre-trained neural network model, and obtaining an axial strain estimation value and a transverse strain estimation value after preliminary separation through model output; matching the principal component score vector with a pre-established strain-space mapping relation, and determining a spatial distribution weight coefficient corresponding to each principal component; and performing linear combination reconstruction on the strain components at all positions according to the spatial distribution weight coefficient to obtain a multi-dimensional strain field distribution result along the length direction of the optical fiber.

The present application relates to the technical field of internal deformation and failure monitoring of slope, and discloses a simulation device for monitoring internal deformation and failure characteristics of an arched slope under excavation conditions, which integrates a digital camera, a high-speed camera, an FBG optical fiber grating strain sensor, an optical fiber grating demodulator and other sensors and monitoring technologies, analyzes deformation characteristics in the excavation process by using a particle image velocimetry (PIV) method, can clearly observe an arched large deformation zone, an upper small deformation zone and two non-yielding zones, and considers the characteristics related to the deformation of the arched slope and the arch effect; in the arched failure, the optical fiber grating demodulator is used to obtain internal transverse strain of the slope and calculate internal shear stress of the slope. The device can not only monitor internal deformation and failure characteristics of the arched slope under the excavation conditions, but also provide important data support for slope stability analysis and disaster prevention.