122 results about "Mechanical load" patented technology

The invention discloses an operation control method for a wind power generation system, and relates to the technical field of operation control, and the method comprises the steps: obtaining the historical operation data of a wind power generation system in a target sea area, taking an offshore environment factor as an interference factor, and coupling the time-space parameters of ocean turbulence intensity, wave load and salt spray corrosion rate; establishing a fan-marine environment digital twinborn body; operation data is acquired in real time, synchronous mapping and dynamic updating of the digital twin are realized, and a state prediction model is established in combination with historical operation characteristics; taking the maximum power generation efficiency and the minimum mechanical load as a multi-objective optimization function, and introducing a model prediction controller to obtain an optimal control sequence of the wind power generation system in a future time domain of each control period; and selecting a first control instruction in the optimal control sequence, issuing the first control instruction to a physical fan torque controller and a variable pitch system in real time, realizing rolling optimization of the wind power generation system, and obtaining a self-adaptive operation control scheme of the wind power generation system. The power generation benefit of the whole life cycle is improved.

The invention provides a wind power blade fatigue damage early warning method and system based on modal energy excursion, and relates to the technical field of wind driven generators. According to the method, a multi-dimensional health baseline library is established under the healthy state of a wind power blade, and a current total strain signal and temperature distribution are synchronously collected in the operation process of a fan; performing temperature-strain decoupling on the total strain by using a healthy baseline library, and accurately extracting a real mechanical strain signal caused by the mechanical load; on the basis, a working condition modal recognition method is adopted to steadily obtain a current inherent frequency and a strain modal shape from real mechanical strain; calculating a current modal energy proportion and comparing the current modal energy proportion with the health baseline to generate an offset index reflecting a modal energy localization degree; and finally, in combination with the amplitude, the duration and the dynamic evolution trend of the offset index, and in combination with a fatigue accumulated damage assessment result, performing graded early warning judgment, and realizing early perception, accurate positioning and risk graded output of the fatigue damage of the blade.

The invention relates to the technical field of electromagnetic shielding rooms, and discloses a load-bearing framework and shielding panel integrated electromagnetic shielding room, which comprises a first structural shielding unit and a second structural shielding unit, the first structural shielding unit and the second structural shielding unit are alternately arranged, the first structural shielding unit comprises a first load-bearing framework, and the second structural shielding unit comprises a second load-bearing framework. The first structural shielding unit comprises a first load-bearing frame, the second structural shielding unit comprises a second load-bearing frame, the edges of the adjacent first load-bearing frame and second load-bearing frame are spliced through a multi-dimensional interlocking structure, so that an electromagnetic shielding room load-bearing framework is defined, and the splicing seam of the first load-bearing frame and the second load-bearing frame is provided with at least one zigzag electromagnetic wave attenuation path. The load-bearing frames and the electromagnetic shielding function are deeply integrated, the first load-bearing frame and the second load-bearing frame are mechanical load-bearing components, electromagnetic shielding is achieved through zigzag electromagnetic wave attenuation paths of the splicing seams and the magnetic conductive filling materials, an independent shielding framework does not need to be additionally arranged, and the overall structure is simplified.

The invention discloses a building material mechanical testing system based on multi-algorithm fusion, and belongs to the technical field of building material testing, and the system comprises an initial damage quantification module which is used for obtaining detection information of a tested material test piece before mechanical loading and generating a quantitative evaluation result; the loading and information acquisition module is used for applying a mechanical load to the tested material test piece with the generated quantitative evaluation result and acquiring a mechanical response signal and a microscopic state signal of the tested material test piece; the damage analysis module is used for calling a preset second data processing algorithm and analyzing and generating a dominant damage path; and the diagnosis and prediction module is used for integrating the associated data atlas and the dominant damage path information, generating a material performance diagnosis report and constructing a prediction model through a preset third data processing algorithm. According to the method, the initial damage of the tested material test piece is quantified, so that systematic deviation of a test result caused by neglecting the initial damage is corrected.

The invention relates to the technical field of fatigue load reduction, in particular to a wind power plant torque and variable pitch cooperative control method with fatigue load reduction as the target. The method comprises the following steps: acquiring real-time and historical operation data of each fan in a wind power plant, and preprocessing the operation data; based on the preprocessed operation data, load characteristic indexes reflecting structural fatigue are extracted, and a load state vector reflecting the current fatigue accumulation trend of the draught fan is constructed; and based on the load state vector, establishing a coupling model of the influence of the generator torque and the variable pitch angle on the rotating speed response and the fatigue load, wherein the coupling model is used for reflecting the influence mechanism of torque adjustment on the low-frequency load and the inhibition effect of variable pitch adjustment on the high-frequency load. According to the method, the load state vector fusing the low-frequency mechanical load and the high-frequency pneumatic excitation is constructed, and the rain flow counting and equivalent damage theory is combined, so that the load component which has the greatest influence on the fatigue life of key parts such as a main shaft, a transmission chain, a tower and a blade root is accurately identified.

The invention provides an aero-engine turbine interstage casing thermal-mechanical coupling loading test device, which comprises a mechanical loading test tool clamp, a temperature field control system and a test assembly, and is characterized in that the test assembly is used for simulating a turbine interstage casing assembly and is installed on the mechanical loading test tool clamp; the mechanical loading test tool clamp is used for composite loading of radial force and axial force of the test assembly. The temperature field control system comprises a cooling system and a heating system, and the cooling system and the heating system enable the test assembly to reach an expected target temperature field by controlling the temperature to adjust the current of the heater and the flow of cold air. The device has the advantages of being simple in structure, flexible to install, high in control precision, easy to operate and the like, and can be used for controlling the deformation discordance of the turbine interstage casing supporting plate and applying the mechanical load of the casing, so that an interstage casing outer ring stress-strain assessment point reaches the working state of an engine, and the working efficiency of the engine is improved. And checking whether the strength design of the inter-stage casing meets the expectation or not.

The invention relates to the technical field of electric cylinders, and provides a heavy-load electric cylinder actuating mechanism with bidirectional overload clutch protection, the heavy-load electric cylinder actuating mechanism with bidirectional overload clutch protection comprises an electric cylinder main body, and a motor is fixedly mounted on the surface of the electric cylinder main body. A threaded shaft rotatably penetrates through the inner wall of the electric cylinder body, and a material pushing shaft is slidably mounted on the inner wall of the electric cylinder body. According to the heavy-load electric cylinder executing mechanism with the bidirectional overload clutch protection, the clutch chuck II moves downwards to be disengaged from the clutch chuck I, at the moment, power transmission to the threaded shaft is cut off, and the material pushing shaft is slidably mounted on the inner wall of the electric cylinder body; clutch protection of the electric cylinder is achieved, breakage or deformation caused by over-torque and over-current is avoided, the service life of key components of equipment is prolonged, and the technical problem that in the prior art, in the operation process of the electric cylinder, due to the fact that the electric cylinder cannot bear high mechanical loads, negative influences on internal components of the electric cylinder to a certain degree are easily caused is solved.

This utility model belongs to the field of bathroom technology, specifically relating to an explosion-proof overhead shower. The invention employs a double-ring gradient connection structure consisting of a main connecting ring and an auxiliary connecting ring. The main connecting ring comprises 2-8 spaced main connecting seats, providing high pre-tightening positioning. The auxiliary connecting ring, located outside the main connecting ring and composed of 12-30 spaced auxiliary connecting seats, is used to equalize circumferential stress. A positioning ring with an annular groove is provided on the inner side of the housing, cooperating with a positioning ring on the water outlet panel to achieve pre-positioning constraint during assembly. A pressure plate is sandwiched between the housing and the water outlet panel, with an integrally formed protrusion at the bottom of its pressure hole inserted into the positioning hole of the housing. The protrusion contains a water outlet hole with a diameter smaller than the pressure hole, forming an integrated throttling and pressure-stabilizing positioning unit. The main and auxiliary connecting parts are locked to their corresponding connecting holes by fasteners, achieving a rigid connection. This structure synergistically improves mechanical load-bearing capacity, assembly accuracy, and hydraulic buffering capacity, significantly enhancing explosion-proof reliability.

The application discloses a dangerous rock mass deterioration multifunctional test device and method, and through the setting of a self-weight stress loading frame and a detachable rock deterioration experiment cabin, deep coupling of mechanical load and environmental erosion is realized, technical defects of mutual disconnection of a stress field and an environmental field in traditional tests are solved from the root, the whole process of rock samples from deterioration evolution to final mechanical failure does not need to experience secondary transportation and repeated installation, a crack initiation and evolution mechanism under the guidance of a stress field is effectively restored, and therefore, the accuracy of experimental data in characterization of real damage laws of dangerous rock mass is remarkably improved.

The invention discloses a high-integration driving unit with an active variable geometric positioning parameter function. The high-integration driving unit is mainly composed of a wheel assembly, a suspension system, a first actuator and a second actuator. The actuator is arranged on the upper control arm, so that the mechanical load borne by the actuating mechanism during working is effectively reduced. The interior of the actuator is driven by a self-locking mechanism, continuous energy consumption is not needed when positioning parameters are maintained, and the steady-state power consumption of the system is remarkably reduced. In the aspect of mechanism connection, through combined arrangement of kinematic pairs, accurate matching of the degree of freedom of movement of the mechanism is achieved, the problems of interference and movement uncertainty in the adjusting process are effectively solved, and the accuracy of action execution is ensured. The unit integrates the functions of steering, active variable camber, active variable kingpin caster angle and fault tolerance. Dynamic real-time adjustment of geometric parameters is achieved through the compact structural layout, the vehicle control limit and stability are improved, and meanwhile the space utilization rate and work reliability are extremely high.

The utility model discloses a walking beam potential energy recovery energy-saving hydraulic system, and belongs to the technical field of hydraulic pressure. The system comprises a control system, a hydraulic pump, an oil cylinder, an energy accumulator set and a reversing valve set composed of seven reversing valves and proportional valves. The four working modes are switched through the control valve set. Small-flow driving is achieved through a differential loop during no-load rising. When the load rises, the energy accumulator releases pressure oil and supplies the pressure oil to the rodless cavity; when the load descends, oil in the rodless cavity is recycled to the energy accumulator to store potential energy; and oil flows back to the oil tank for circulating cooling during no-load descending. The gravitational potential energy recycling device can recycle gravitational potential energy in the descending process of a mechanical load, when load equipment needs to ascend again, hydraulic pressure of the energy accumulator is released and used for supporting ascending of the load, and the hydraulic energy is converted into the gravitational potential energy again. In the process of switching the system from no-load rising to load rising, pressure impact caused by switching of the reversing valve is limited on the valve group and is not transmitted to an oil cylinder and equipment.

The invention relates to the technical field of numerically-controlled machine tools, and particularly discloses an external mechanical skeleton production monitoring system based on a numerically-controlled machine tool, and the system comprises a data collection module which is used for collecting electrical parameters and mechanical parameters of the numerically-controlled machine tool in a one-time external mechanical skeleton production process according to a fixed time interval; a data calculation module is combined with electrical parameters of a numerical control machine tool in the one-time external mechanical skeleton production process, and main shaft rotating speed data in the mechanical parameters are cleaned and corrected based on the data, so that comprehensive analysis of electrical data of the machine tool can be introduced, and the influence of electrical data changes on a main shaft is eliminated; reliable and accurate data are provided for follow-up evaluation of the mechanical load risk, the reliability of the mechanical load risk evaluation result of the numerical control machine tool can be guaranteed, reliable data support can be provided for follow-up prediction of the future load risk of the numerical control machine tool, and therefore the accuracy of external mechanical skeleton production monitoring is guaranteed.

A test specimen (10), in particular for pressing into an object (12) to be tested, which is, for example, a covering system for buried steel pipes (14), has the shape of a truncated pyramid, truncated cone or a hemispherical layer with a base area (10g) and a top surface (10d), wherein - the projection of the top surface onto the base surface lies within the base surface; - the top surface is parallel to the base surface. A method for determining the mechanical strength of a casing system for buried steel pipes includes the following: - the test specimen is pressed from the outside against the encapsulation system with the top surface facing forward, according to a predetermined path and / or force profile; - the penetration depth of the test specimen into the encapsulation system is recorded; - the load-bearing capacity is determined depending on the measured penetration depth. A test rig (16) for determining the mechanical strength of a casing system for buried steel pipes comprises - a holding system (18); - a material testing machine (20) that can press the test specimen with the top surface forward against the encapsulation system; - a measuring device (22) that can detect the penetration depth of the test specimen into the encapsulation system; - a control device (24) which, according to the procedure, can control the material testing machine and the measuring device and determine the load-bearing capacity. The test specimen is used to determine the mechanical load-bearing capacity according to the procedure.

This application belongs to the field of wearable robot technology, specifically providing a mechanical load-bearing exoskeleton system based on ground reaction force self-triggering. The exoskeleton system includes an upper body mechanism, a thigh mechanism, a knee joint mechanism, a lower leg mechanism, and a foot mechanism. The knee joint mechanism includes a knee joint support, a locking component, and a transmission assembly. When the foot mechanism touches the ground and the sole of the foot is compressed and deformed by the ground reaction force, the thigh mechanism slides downward relative to the knee joint support. The transmission assembly drives the locking component to slide towards the thigh mechanism and connect with it, thereby locking the knee joint mechanism. The compression deformation of the sole of the foot caused by the ground reaction force is used as a trigger signal to automatically trigger the locking of the knee joint mechanism. The knee joint mechanism can lock at any reasonable angle, so that when the wearer is going up or down slopes, climbing stairs, or bending their knees for cover, the exoskeleton system can still effectively assist the human body in bearing the load by locking the knee joint mechanism.

The utility model discloses a mechanical load test device for a charging interface, which comprises a case with an inner cavity and a machine table connected to the side wall of the lower part of the case, a jig is rotatably arranged on the side wall of the upper part of the case, and a charging gun with a cable is mounted on the jig. A driving mechanism connected with the jig is arranged on the inner wall of the machine box, a lifting table is arranged on the top face of the machine table in a lifting mode, and a force application assembly and a clamping assembly connected to the upper portion of the force application assembly are placed on the lifting table. According to the utility model, the charging gun is installed through the clamp, a charging interface load test is carried out on the charging gun through the force application assembly after the cable of the charging gun is clamped by the clamping assembly, and the cable can be stably fixed by the clamping assembly, so that the cable is not easy to fall off, safety accidents are avoided, and the test efficiency is improved.

The invention discloses a compressor reverse rotation detection method and device, and the method comprises the steps: carrying out the torque compensation control of a compressor in the operation process of the compressor; a mechanical compensation angle theta calculated in the torque compensation control process is obtained; a normal mechanical compensation angle theta'determined in advance according to the compressor is obtained; and when | theta-theta '| exceeds a set angle threshold value, determining that the compressor is in a reverse rotation state, otherwise, determining that the compressor is in a forward rotation state. In combination with the mechanical load fluctuation characteristics of the compressor, whether the compressor rotates reversely or not is judged according to the relation between the mechanical compensation angle calculated during torque compensation control in the operation process of the compressor and the normal mechanical compensation angle, the detection precision is high, hardware design of an existing variable frequency air conditioner and a controller does not need to be changed, cost is not increased, and the reliability is high. And the overall safety of the variable-frequency air conditioner is improved.

An apparatus (1) for connecting an implement to a work machine has a pivoting device (2) by means of which an implement connecting device (4) can be pivoted relative to a work machine connecting device (3) about a pivot axis, wherein the pivoting device (2) has a hollow cylinder, a piston shaft which is mounted pivotably about the pivot axis in the hollow cylinder, and an annular piston sleeve which is mounted displaceably in an axial direction along the pivot axis between the hollow cylinder and the piston shaft. The piston shaft has, successively in the axial direction between the two radial bearings, an annular piston sleeve sliding section with a sliding section diameter and the piston shaft engagement section with an engagement section diameter (DE) which is greater than the sliding section diameter (DG). A torque measuring device is arranged on or in the piston shaft in the piston shaft engagement section, by means of which torque measuring device a torque characteristic variable for a torque acting on the piston shaft can be detected.

A system (100) for detecting leaks in a sealed container comprises a conveyor belt (10) positioned to transport a container along a forward direction (F), a pressurizing system (20) configured to apply a compressive mechanical load to a container by pressing it against the conveyor belt (10), a suction and measuring system (40) comprising suction units (41, 42, 43) configured to draw gas from an area adjacent to the container under compression, and one or more sensors for measuring the concentration of one or more gases in the drawn gas, and a processing unit configured to compare the gas concentration measured by the suction and measuring system (40) with a reference gas concentration to determine whether the container under test is leaking. The pressurizing system (20) comprises a plurality of rollers (21, 22, 23, 24) connected to a moving member (25) controlled by a control unit.

The invention relates to the technical field of zirconia production, and discloses an intelligent manufacturing control system and method based on cubic zirconia crystal industrial production. The system comprises a multi-source data synchronization and signal purification module, a condensation shell thickness real-time calculation module, a mechanical load resistance feedback module, a bridging fault intelligent diagnosis module and a growth rate cooperative control module. Heat conduction characteristic time delay is extracted through cross-correlation operation to invert the physical thickness of the condensation shell; meanwhile, equivalent side wall friction resistance is calculated through torque current of the servo motor, and physical consistency verification of the mechanical dimension is carried out on the thermal model. The system integrates thermal, electromagnetic and mechanical multi-dimensional parameters to calculate a bridging risk index, and accordingly judges a fault and automatically executes remelting repair or closed-loop rate control based on thickness feedback. The problems that in the prior art, the growth state cannot be quantified in real time, and single-dimension monitoring is prone to interference are solved.

This invention relates to the field of gas pressure regulating device testing and discloses a comprehensive experimental system for the evolution of quality defects in urban gas pressure regulating devices. Compared to current technologies that only study the evolution of quality defects in gas pressure regulating devices from a single perspective, resulting in incomplete research, this application uses vibration and fatigue simulation devices to transmit vibration and mechanical loads to the gas pressure regulating device. A gas source drives solid particles injected by an erosion simulation device and corrosive media injected by a corrosion simulation device. The gas pressure regulating device is repeatedly eroded through a loop pipeline, replicating the process where vibration during production accelerates the shedding of corrosion products and surface hardened layers, exposing fresh metal surfaces and intensifying corrosion. Simultaneously, the detached particles become new abrasive materials, further exacerbating material loss—a vicious cycle. By collecting relevant data during the experiment, a comprehensive experimental study of the evolution of quality defects in gas pressure regulating devices is achieved.

This invention discloses a 420KN round-head sandblasted suspension insulator, relating to the field of suspension insulator technology. To improve the stability, pollution resistance, mechanical load-bearing reliability, ease of installation and maintenance, and impact resistance of the sandblasted layer of the round-head sandblasted suspension insulator, it specifically includes a porcelain body, a round-head connecting assembly, a skirt assembly, and an anti-detachment sandblasting structure. The porcelain body is a columnar structure with a round head integrally formed at the top. The round-head connecting assembly is fixedly installed on the top of the round head for connection with transmission towers or adjacent insulators. The skirt assemblies are spaced apart along the axial direction of the porcelain body. The anti-detachment sandblasting structure covers the outer surface of the round head and the outer surface of the skirt assembly. This invention effectively solves the problems of easy detachment and cracking of existing sandblasted layers. Simultaneously, the protective surface layer improves the weather resistance and corrosion resistance of the sandblasted layer, extends its service life, and thus ensures the long-term stable pollution resistance and insulation performance of the insulator, making it suitable for use in particularly harsh environments.

The invention discloses a circuit breaker operating mechanism load simulation device and a test method. The load simulation device comprises an eccentric wheel, a motor, an output sliding block, a force sensor, a displacement sensor and a bottom plate. An adjusting sliding block is arranged on the surface of the eccentric wheel in the radius direction of the eccentric wheel and can move in the radius direction of the eccentric wheel. The output shaft is connected with an eccentric shaft of the eccentric wheel and drives the eccentric wheel to rotate; a connecting rod is rotationally connected between the output sliding block and the adjusting sliding block, and the eccentric wheel rotates to drive the output sliding block to reciprocate; the force sensor is connected with the output sliding block and transmits force to a load part; the displacement sensor is used for detecting the displacement of the output sliding block; the eccentric wheel, the motor and the displacement sensor are arranged on the top of the bottom plate. The load simulation device is high in flexibility and can simulate a real mechanical load.

The embodiment of the invention relates to the field of fan testing, and discloses a doubly-fed motor testing method and system and a rotor testing method and system. In the invention, a stator winding of the doubly-fed motor is configured to be in an open circuit state, a rotor shaft of the doubly-fed motor is mechanically connected with a dragging device, and a rotor slip ring of the doubly-fed motor is electrically connected with a variable-frequency power supply device; the method comprises the following steps: controlling the dragging device to drive a rotor of the doubly-fed motor to rotate so as to apply a mechanical load, and controlling the variable-frequency power supply device to inject alternating current into the rotor so as to apply an electric heating load; wherein the mechanical load and the electric heating load of the rotor are mutually decoupled based on the open circuit state of the stator winding; and monitoring state parameters of the doubly-fed motor. Therefore, the problems that the test cost is high, the energy consumption is large, the test working condition simulation of a single part is not real, and the fatigue failure risk of the rotor system cannot be fully identified in the prior art are solved.

The utility model discloses a kind of multi-grade adjustment rotary switches, including base, shell cover, rotating handle and contact assembly, rotating handle rotationally arranged between base and shell cover, and drive rod extending along its radial direction is provided;Contact assembly includes the multiple elastic structure's moving contact bridge of the shaft center of rotating handle as center annularly arranged in installation cavity, and multiple static contact pieces are arranged in base and respectively opposite multiple moving contact bridges, multiple moving contact bridges are connected and respectively located on the movement path of drive rod, drive rod respectively drives multiple moving contact bridges and multiple static contact pieces contact in rotating handle rotating process, by the mechanism of the wheel contact formed by drive rod and multiple moving contact bridges, operation pressure is significantly dispersed, avoid single moving contact bridge sustained stress, greatly reduce the mechanical load and fatigue degree of moving contact bridge, reduce the probability of heating, reduce wear and risk of fusion welding, extend mechanical service life.

A physical model test device and method for accelerated corrosion of an anchored bedding slope comprises a shell, a simulated rock mass, an electrolyte system, a mechanical loading system and an observation system, a plurality of anchor rods are arranged on the front side of the simulated rock mass, a slope structure is simulated through the simulated rock mass, the simulated rock mass and the anchor rods on the simulated rock mass jointly form a simulated anchoring system, and the simulated anchoring system is connected with the electrolyte system. The electrolyte system is used for enabling electrolyte to circularly flow inside or around the simulated rock mass, and the mechanical loading system is arranged at the top of the simulated rock mass and is used for applying pressure in the vertical direction to the simulated rock mass, so that the stratified slope geologic structure, the electrochemical accelerated corrosion environment and the multi-mode mechanical load are integrally and synchronously simulated. According to the design, key elements in slope engineering can be simulated, the fidelity of a corrosion mechanism is effectively improved, the corrosion rate and an accelerated degradation mechanism of an anchor rod stress concentration area can be simulated, and the dynamic coupling process is effectively revealed.

The application discloses a kind of environmental simulation test device of FRP reinforced concrete beam considering multi-factor coupling, belong to civil engineering structure durability test equipment technical field, the device includes integrated environmental box system, multi-mode loading system, multi-field coupling measurement and control system and auxiliary support system;Integrated environmental box system includes double-layer insulation stainless steel structure, and multi-mode loading system is integrated with environmental box;Multi-field coupling measurement and control system is with PLC as core, realizes multi-parameter centralized control, data acquisition and multiple safety protection.The application adopts the above-mentioned environmental simulation test device of FRP reinforced concrete beam considering multi-factor coupling, realizes the independent regulation and control of mechanical load, temperature and humidity field, corrosion medium, freeze-thaw cycle multiple factors and collaborative coupling, meets the durability test demand of FRP reinforced concrete in complex environment such as cold region, coastal area, industrial corrosion, improves test authenticity, stability and automation level.

The application discloses a carbon dioxide sand carrying device for oil field well injection fracturing, and relates to the technical field of oil field fracturing equipment, comprising a driving motor, a resistance feedback mechanical adjusting assembly, a self-adaptive wear compensation wall scraping assembly and a spiral gas supply linkage assembly. The resistance feedback mechanical adjusting assembly comprises a flow sensing sheet, a lever and a push rod. The flow sensing sheet is used for sensing the change of material conveying flow in real time. The top of the lever is connected with the bottom of the flow sensing sheet. The left side of the lever is a long side, and the right side is a short side. The systematized cooperation of the resistance feedback mechanical adjusting assembly, the self-adaptive wear compensation wall scraping assembly and the spiral gas supply linkage assembly is realized. The resistance feedback mechanical adjusting assembly is composed of a pure mechanical closed loop formed by a flow sensing sheet sensor, a lever amplification, a first bevel gear and a second bevel gear meshing damping adjustment. The core lies in that the resistance change signal of downstream conveying is converted into adjustable mechanical load of the main driving shaft, instead of changing the rotating speed through a variable speed gear box.

The invention discloses a load spectrum construction and test method for an accelerated degradation test of a cantilever porcelain insulator of a contact network, and the method comprises the construction of a composite load spectrum and the accelerated degradation test based on the composite load spectrum, and can simulate the coupling effect of dynamic temperature circulation and static mechanical bending load in an actual working condition through the construction of the composite load spectrum. Performing an accelerated degradation test based on the composite load spectrum to obtain performance degradation data of the overhead line system cantilever porcelain insulator under the coupling action of the temperature and the mechanical load, and realizing life prediction and reliability evaluation of the overhead line system cantilever porcelain insulator; the load spectrum obtained by the method can truly simulate the service life of the overhead line system cantilever porcelain insulator in various load environments, thereby helping a railway operator to determine the optimal insulator maintenance and replacement period, and improving the safety and reliability. Performance degradation data of the overhead line system cantilever porcelain insulator under the superposition effect of the temperature and the mechanical load are obtained through an accelerated degradation test, and reference is provided for porcelain insulator structure optimization and material selection.

The invention relates to an apparatus (1) for measuring a mechanical load in a body (6) by means of a magnetic field sensor (2) and a magnetic field generating device, which can be used to generate a magnetic field in the body (6), wherein the magnetic field sensor (2) is designed to detect a change in the magnetic field in the body (6) owing to a mechanical force acting on the body (6). In order to enable a measurement of the mechanical load with particularly high accuracy and without special requirements regarding a material for the body (6), the invention provides for a magnetic field to be detectable by means of the magnetic field sensor (2) in a magnetic measuring direction (4), with this measuring direction (4) being oriented at a measuring angle (a) with respect to a field direction (5) of the magnetic field which can be generated by the magnetic field generating device. The invention further relates to a method for determining a mechanical load on a body (6) by means of an apparatus (1), wherein a magnetic field is applied to the body (6) by means of a magnetic field generating device, and a change in a magnetic field in a magnetic measuring direction (4) caused by the mechanical load on the body (6) is measured by means of a magnetic field sensor (2).