575 results about "Stress change" patented technology

The invention discloses a distributed optical fiber oil channel leakage monitoring method and device based on interference theory. The monitoring system needs to lay an optical cable along the channel, and forms a fiber micro oscillation sensor with the fiber in the cable. When the channel has leakage, it will generate leakage noise, thus the fiber micro oscillator sensor can measures the micro oscillation and stress change around the channel, and it can fix on the leakage position quickly and accurately. The device is made up of distributed fiber micro oscillation sensor, guiding fiber and micro oscillation detector. The technology not only can detect the leakage, but also can detect the event which can cause the leakage, and it can send out alarm and accurate localization. The device has high sensitivity and localization precise, and the disturbance ability is strong, and it is reliable.

A computer-based system generates digital and audio responses to changes in fluid and rock properties of a producing hydrocarbon reservoir for surveillance analysis. The system calibrates observed changes against directly-measured field data in order to optimize the reservoir model. The changes may include, for example, stress changes in rock, impedance changes in rock, and fluid density changes.

Certain example embodiments relate to systems and/or methods for preferentially and selectively heat treating conductive coatings such as ITO using specifically tuned near infrared-short wave infrared (NIR-SWIR) radiation. In certain example embodiments, the coating is preferentially heated, thereby improving its properties while at the underlying substrate is kept at low temperatures. Such techniques are advantageous for applications on glass and/or other substrates, e.g., where elevated substrate temperatures can lead to stress changes that adversely effect downstream processing (such as, for example, cutting, grinding, etc.) and may sometimes even result in substrate breakage or deformation. Selective heating of the coating may in certain example embodiments be obtained by using IR emitters with peak outputs over spectral wavelengths where the conductive coating (or the conductive layer(s) in the conductive coating) is significantly absorbing but where the substrate has reduced or minimal absorption.

The present invention provides a secondary battery module which is excellent in vibration resistance. A battery module 20 has assembled battery blocks 11 each constituted by screw-fixing the assembled batteries 2 to the block bases 3, 4 supporting a lower portion thereof and the two block reinforcing plates 5 supporting an upper portion thereof, the six assembled batteries 2 are sandwiched by and fixed firmly to the block bases 3, 4 and the block reinforcing plates 5. The assembled batteries 2 do not move freely even if vibration is added to the battery module 20. Because the elastic sheet 9 is laid between the block bases 3, 4 and the assembled batteries 2, since a space derived due to variance in size accuracy of frames 12 which hold and fix the unit cells 11 and derived due to variance in size accuracy of the block bases 3, 4 can be removed, and vibration resistance can be enhanced. To thermal stress change caused due to combination of different materials, influence thereof can be reduced by laying the elastic sheet 9.

The present disclosure relates to a pump mechanism driven by differential pressure conditions and method for delivery of materials. In one embodiment, the pump mechanism may be used to deliver treatment chemical to a plunger apparatus or directly to a wellbore by exploiting pressure conditions found at a well. In certain embodiments, the pump mechanism is able to balance high pressure conditions available within a petroleum formation against low pressure conditions present in a common flow line serving the well. In so balancing these pressures, the pump mechanism is able to automatically tune itself to the needs of the well, ensuring continued operation over a wider range of operating conditions. The pump mechanism has the further advantages of lower operation costs and less environmental impact as compared with existing pumps. The pump mechanism can be used in connection with a chemical applicator which can be used to apply chemical into, onto, or below, a plunger or plunger/dispenser apparatus used in plunger lift operations, or to apply chemical directly down the well. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. 37 CFR 1.72(b)

The invention relates to a distributed optical fiber Brillouin sensing device for detecting temperature and strain synchronously and a method for detecting the temperature and the strain synchronously by use of the device. The method is based on the linear relation among the frequency shift change of the spontaneous Brillouin scattering in the optical fiber, external temperature change and external strain change, a compound sensing optical fiber is formed by two different types of sensing optical fibers, and the variation of the temperature and the strain can be distinguished at the same time through different responses of the two optical fibers to the external temperature change and the external stress change. According to the device and the method, the temperature change and the strain change in a sensing area can be detected at the same time, and the detection precision of an optical fiber distributed sensor based on spontaneous Brillouin scattering can be improved.

The invention discloses a monitoring method for an influence on adjacent existing structures from tunnel excavation, comprising the following steps: (1), making a monitoring plan according to a geologic report, adjacent existing structure conditions and a construction plan for a tunnel; (2), organizing construction works by the construction party according to the construction progress; (3), performing field monitoring according to the monitoring plan; (4), organizing the monitored data and performing a simulation analysis on the monitored data, and judging whether the data is in the range of the pre-warning value; (5), pre-warning the construction party; (6), assessing the rationality and scientificity of the construction technology, and adjusting the construction plan. The invention establishes a monitoring method with a set of perfect system, and sets monitoring index values, and selects and arranges monitoring points, and monitors vertical deformations of the baseboards of the adjacent existing structures, stress changes of surrounding rocks in disturbed areas, shock vibrations of tunnel blasting, cracks of existing structures and walls, leveling for the baseboard and so on, and establishes communication between the construction and monitored information to form a positive cycling for quality controls on engineering constructions.

The invention relates to a method for measuring welding residual stress-a partial layer-by-layer blind hole removing method for measuring the residual stress on the basis of a blind hole method, which proposes to measure the residual stress in a component by using the partial layer-by-layer blind hole removing method. After materials of certain depth on both the front side and the opposite side of a component to be measured are partially removed, the blind hole method is used for measuring the residual stress. The method is a semi-destructive residual stress measuring method, can be used for carrying out multi-point measurement and measuring the residual stress in the component with severe stress change and has convenient operation and high measuring efficiency. Proved by a thick plate carbon steel welding residual stress measuring test, the method has more accurate measuring results.

The invention discloses a reliability acceleration test method of electronic products, and belongs to the field of reliability designing and testing. The method comprises steps of firstly presetting an acceleration test temperature change curve boundary according to working stress limit obtained via a routine test for reliability of an electronic product, carrying out simulating calculation of temperature acceleration factors, and modifying and determining initial acceleration test temperature stress change curves; and secondly, calculating vibration acceleration factors according to the initial acceleration test temperature stress change curves and a test profile of the routine test for the reliability of the original electronic product, calculating acceleration test vibration stress change curves according to the vibration acceleration factors, and according to the acceleration test vibration stress change curves, determining the final temperature stress change curves and determining acceleration test time. According to the invention, by following the thought of testing and examining working stress of a product and properly increasing test stress level, test time is shortened; a reliability test of the electronic product can be accelerated; and diversity and controllability of the acceleration factors are achieved.

An ultrasound transducer is constructed to be under damped at higher overtone frequencies by reducing losses through one or more of the following: even pressure shaped surfaces on masses, reversed drive to at least one piezoelectric ceramic, an ultrasonically formed metallic bond between the transducer's front mass and the radiating surface, high current carrying strain relieved electrodes, fine grain structure masses, low internal friction masses and radiating materials, and zero bias stress change due to temperature variations. Improved methods and construction details for bonding the higher overtone frequency transducer to quartz are disclosed and include: front masses with cross-hatched or concentric circle patterns and invar front masses or an invar transition mass that is bonded to the quartz.

A method including analyzing seismic data relating to a producing hydrocarbon reservoir is disclosed. The seismic data includes first and second sets of seismic data obtained at different times. An interval composed substantially of hard rock is identified in the hydrocarbon reservoir. 4D seismic attributes for the region are calculated. Rock physics relationships are applied to seismic data related to the interval according to the permeability associated therewith. A fluid saturation change or a pressure change of the interval is inferred based on outputs of the first or second sets of rock physics relationships and the calculated 4D attributes for the interval. The inferred fluid saturation change or pressure change of the interval is outputted.

The invention relates to a method for finite element optimization of bolt pretightening force and bolt structural design. A two-dimensional FEA (finite element analysis) modified model and the method are applicable to structural modeling of different bolts. By considering various types of nonlinear factors such as complex contact, friction, pretightening in threaded connection, three-dimensional spiral thread structures are simplified effectively by the planar FEA modified model while calculation precision is guaranteed. The pretightening force and an external force are loaded step by step by inputting component parameters and material attributes and integrating nonlinear factor relationships. A curve of maximum stress changing along with the external force and a curve of changing of maximum stress inside the thread along with the pretightening force are defined according to stress status in the thread area. The optimal pretightening force of threaded connection is determined by judging whether contact faces are separated or not. Optimal bolt structural design and optimal parameters are calculated according to maximum external force borne by the bolt structure and the required pretightening force of the bolt structure. The method is also applicable to rectangular or other nonstandard threaded bolt structures.

The invention relates to an on-line safety evaluation method for water-cooled walls. The method comprises the following steps: arranging a small amount of test points in the pipeline section with typical flow heat transfer in each radiation zone, combining with the existing test points at the entrance and exit outside the furnace, calculating and checking the characteristic parameters of the inner wall of the water-cooled wall of the station boiler, inputting to a computer for calculation, performing the on-line real-time calculation of the Parameters such as pipeline flow, entrance and exit pressures, enthalpy value, lengthwise furnace inner wall temperature of each pipeline section and stress change value, to judge whether the dangerous factors exist, such as hydrodynamic instability, over-temperature and creep fatigue, displaying the calculation results in real time, recording the data as judgment basis of safe operation of the water-cooled wall. The invention realizes the optimal operation of equipment, manages the repair and maintenance based on the operational state, and ensures the state maintenance and repair of equipment.

The invention discloses a testing device and a testing method for monitoring steel wire rope-friction pad dynamic micro-friction state. The testing device comprises a base frame, a loading system, a micro-slip system and a state monitoring system, wherein the loading system comprises a weight loading system, a hydraulic loading system and a steel wire rope; the micro-slip system comprises a support system, a drive system and a friction transmission system; the state monitoring system comprises a dynamic tension monitoring system, a pad stress measuring system, a friction force measuring system and a micro-slip monitoring system. By utilizing the testing device and the testing method, dynamic alternating tension can be applied to the steel wire rope and dynamic micro-friction can be applied between the steel wire rope and a friction pad simultaneously, and dynamic tension evolution of the steel wire ropes at both sides of the friction pad, micro-slip amplitudes of different sections of a contact arc of the steel wire rope and the friction pad, stress change of the friction pad near the contact zone of the steel wire rope and the friction pad and dynamic friction force between the steep wire rope and the friction pad can be measured in real time.

The invention relates to the technical field of micro mechanical electronics, in particular to a resonance micro accelerometer with high sensitivity, which solves the problem that the measuring sensitivity of traditional resonance accelerometers based on stress change is easy to be affected by interior residual stress and other factors. The accelerometer comprises a glass substrate, a mass block, two DETF resonators and a sensitive capacitor. The resonators are arranged in parallel/row and opposite to the side of the sensitive capacitor. The sensitive capacitor comprises a plurality of plate capacitors, polar plates at one side of which are fixed to the tuning forks by an articulated beam and polar plates at the other side of which are fixed by a supporting and connecting beam; the mass block is arranged between the two resonators, and a pair of symmetrical micro levers are arranged between the mass block and the two resonators respectively; the micro levers at the two sides of the mass block are symmetrical corresponding to the mass block, and one end of the micro level is fixed on the mass block and the other end on the supporting and connecting beam of the plate capacitor. The accelerometer of the invention has the advantages of reasonable structure, low volume, high sensitivity, good detecting effect and good development prospect.

The invention relates to a measurement method for stress change of rocks during TBM tunneling. The technical problems to be solved in the invention are as follows: providing the measurement method for stress change of rocks during TBM tunneling, measuring the three-dimensional stress change of some point in rock of a TBM evacuation hole section, judging the damaged range of the rock, and optimizing supporting design to ensure the overall stability of a grotto and the safety of stuff. The technical scheme for solving the problem is as follows: the measurement method for stress change of rocks during TBM tunneling comprises the following steps: a, determining the embedding position and the quantity of measure points of a hollow inclusion stressometer; b, digging an auxiliary hole or using an existing grotto to drill a TBM hole section to be evacuated and embedding the hollow inclusion stressometer; c, performing TBM tunneling, monitoring and recording the stress change of the hollow inclusion stressometer; d, determining the elastic modulus and Poisson ratio of rock of a section to be measured; and e, working out an equation, i.e. E epsilon k=Ak1sigmax+ Ak2sigmay + Ak3sigmaz + Ak4tauxy + Ak5tauyz + Ak6tauzx, solving the six components, namely sigmax, sigmay, sigmaz, tauxy, tauyz and tauxz of ground stress. The measurement method is mainly used for the supporting optimization design of construction time of tunnels and the like and the estimation of overall stability of grottos.

The invention provides a monitoring device and a monitoring method for a mining FBG roof separation layer. The device comprises a vertical measurement barrel and a packaging casing, wherein fixed pulleys, tape pulleys and constant-strength cantilever beams are symmetrically arranged in the packaging casing; a steel wire rope penetrates through the tape pulleys and the fixed pulleys and penetrates out from a steel wire rope guide hole in the top part of the vertical measurement barrel; one end of the steel wire rope is connected with an anchor head; a shallow part measurement point and a deep part measurement point are distributed inside a drill hole; the anchor head is pushed to the measurement points in the drill hole; when the stress of the steel wire rope changes, the stress change is displayed through wavelength values of an FBG A and an FBG B; a wavelength demodulation device is used for demodulating the wavelength values into digital signals, the digital signals are sent to a computer for real-time processing, and a separation layer numerical value is combined for drawing a separation layer quantity changing curve and a set separation layer boundary value; whether the separation layer exists is judged; and the data change of the roof separation layer is monitored in real time. Temperature compensation is performed with a differential form, on-line measurement of the roof separation layer is realized, the reliability and the accuracy are high, an early warning signal can be issued, and roof fall accidents can be avoided.

The invention relates to a integrated circuit comprising an electronic circuit integrated on a substrate (5), and further comprising protections means for protection of the electronic circuit (25). The protection means comprise: i) a first strained encapsulation layer (10) being provided on a first side of the substrate (5), wherein the first strained encapsulation layer (10) has a strain (S1) in a direction parallel to the substrate (5), and ii) disabling means (20) arranged for at least partially disabling the electronic circuit (25) under control of a strain change in the substrate (5). The invention further relates to a method of manufacturing such integrated circuit, and to a system comprising such integrated circuit. Such system is selected from a group comprising: a bank-card, a smart-card, a contact-less card and an RFID. All embodiments of the integrated circuit in accordance with the invention provide essentially an alternative tamper protection to the data stored or present in the electronic circuit therein. A first main group of embodiments concerns an integrated circuit wherein tamper protection is obtained by detecting a strain change during tampering and subsequently disabling the electronic circuit. A second main group of embodiments concerns an integrated circuit wherein tamper protection is obtained by designing a stack of strained encapsulation layers, such that tampering causes releasing of strain and thereby mechanical disintegrate (break, delaminate, etc) of the integrated circuit, and thus disabling the electronic circuit.

The invention relates to a method for testing residual stress of a steel rail. The method is characterized by comprising the following steps of using a steel rail with the length of 1m, taking one point (namely a center position) 500mm away from the end of the steel rail, drawing a line which is arranged at the point in the circumferential direction vertical to the axis of the steel rail, sequentially and alternatively taking 14 points from the center point of the rail bottom to the center of the rail head in the linear direction, attaching each point with a strain sheet, measuring the initial value of the residual stress of each point by a static stress-strain gage, using the line drawn on the steel rail as a center line, cutting steel rail into 20mm thin sheets at each 10mm part of the two ends of the center line in the direction vertical to the axis of the steel rail, and then measuring the final value of the residual stress of each point by the static stress-strain gage. The method has the advantages that by adopting the multi-point testing, the stress distribution conditions of the rail bottom, the rail waist, the rail head and other parts are acknowledged, the stress change of each point is analyzed, then the pressing amount of a rolling machine is corrected, and the distribution of the residual stress is adjusted, so the steel rail is qualified.

The invention discloses an active pressure-bearing type positioning borehole stress meter and a use method thereof. The active pressure-bearing type positioning borehole stress meter comprises a columnar shell, wherein the columnar shell is full of grease oil; a piston is arranged at one end of the columnar shell; an elastic inductor is arranged at the other end of the columnar shell; a foil gauge is arranged on the elastic inductor; a rigid bearing piece is arranged on one side of the columnar shell; the rigid bearing piece is inserted into the columnar shell; the contact parts of the rigid bearing piece and the columnar shell are in sealing contact; and an angle sensor is fixed on the columnar shell. The active pressure-bearing type positioning borehole stress meter has an active pressure-bearing function, can timely judge a change rule of the stress, can dynamically quantitative monitor a stress change condition of a danger area during the whole process and can supply a reliable data to the forecasting and preventing for the impact danger. The stress change along a certain direction can be continuously observed according to a mounting position of the stress meter, so as to further confirm the direction of the force and conveniently and specifically prevent the rock burst.

The invention belongs to the technical field of a human body mechanics design, and specifically relates to a force measuring and supporting structure, for measuring stress change conditions of a front sole and a rear sole at the bottom of a human foot and supporting a matched device. Compared to the prior art, plantar stress is converted into change of air pressure in an air pipe, a force measuring effect is achieved through acquisition of gas pressure, the structure is simple and reliable, supporting of the matched device above an ankle joint and buffering of a load impact are taken into full consideration, and the practicality is high. When a person moves, plantar pressure forces the pressure measuring air pipe to be compressed and deformed, the internal air pressure is changed, a gas pressure sensor converts pressure signals into electric signals, and a monitoring system can determine the change condition of the plantar pressure according to the signals; and the structure of the ankle joint guarantees a higher carrying capacity, and takes full consideration of a buffering effect caused by motion to a force.

The invention discloses a dense roadway group rock burst hazard prediction method. The method includes the following steps: first acquiring the dynamic sensitive area of a coal bed in a dense roadway group area; then mounting roof dynamics monitors along a direction leading to a dense roadway group to carry out roof dynamics observation; before a dynamic area stress range related to coal mining gets close to the dense roadway group, mounting highly sensitive stressmeters in the sensitive area to observe stress change, and when the stress increment is abruptly changed, carrying out rock burst hazard monitoring. By means of an artificial blasting technique in the dense roadway group, the method acquires the coal-rock stratum disturbance-sensitive area, finding a vulnerable area; the roof dynamics method is adopted to acquire the tendency characteristics and range of dynamic stress and quantitatively describe the distribution rule of the dynamic stress; delicate physical quantity observation timely judges the early disturbance response of the dense roadway group, rock burst hazard process monitoring is carried out before high energy is released, and the hazard level is judged by means of indexes.