191 results about "Safety coefficient" patented technology

According to the large-span steel structure refined construction method based on the simulation model, through whole-process refined simulation and optimization, the construction level of a large-span steel structure is remarkably improved, the construction scheme is determined based on a multi-objective optimization algorithm, accurate design of parameters such as hoisting, supporting and monitoring is achieved, a temperature field model is combined with actual measurement correction, and the construction efficiency is improved. The integration of optimization closure temperature, node semi-rigidity and initial defects enables simulation errors, support stability evaluation and optimization guarantee of safety coefficients, most construction risks can be predicted in advance on the whole, the field adjustment time is shortened, the formal construction period is shortened, the construction efficiency and safety are greatly improved, the obvious engineering value and economic benefits are achieved, and the method is suitable for popularization and application. The problem that an existing large-span steel structure construction method lacks a calculation model for predicting the risk in advance and shortening the construction period by combining multi-aspect data is solved.

The application relates to a vehicle type traveling equipment. The vehicle type traveling equipment comprises a cutting assembly, a chassis, a cutting motor, a detection device and a control device. The cutting assembly comprises a mowing element for mowing. The chassis supports the cutting assembly. The cutting motor is arranged to drive the cutting assembly. The detection device detects a first operating parameter and a second operating parameter of the cutting motor. The control device controls the cutting motor to stop or slow down when the first operating parameter is in a first threshold range and the second operating parameter is in a second threshold range for a first preset time. The second operating parameter is different from the first operating parameter, and the second operating parameter at least comprises a rotating speed of the cutting motor. The application improves the accuracy of judging whether the cutting assembly works normally, and further improves the safety factor of the vehicle type traveling equipment.

The invention discloses a gear pair life prediction method based on dynamic stress, belongs to the technical field of reliability design of mechanical transmission systems, and aims to solve the problem of inaccurate life prediction caused by neglecting a dynamic effect and a real surface topography in an existing gear design method. The method comprises the following steps: firstly, acquiring gear pair interface mechanical property parameters considering shafting vibration, dynamic load and surface roughness, wherein the parameters comprise transient oil film pressure, friction coefficient, oil film thickness and shear stress; solving a three-dimensional subsurface stress field by adopting an algorithm and calculating von Mises equivalent stress distribution; stress volume integration is conducted on different rough surfaces, the honed surface is used as the reference, the relative fatigue life of other surfaces is calculated based on the Zaretsky life prediction theory, and accurate prediction and process optimization of the contact fatigue life are achieved; meanwhile, the dynamic bending stress of the tooth root is calculated based on the dynamic normal load, and the bending fatigue safety coefficient is checked.

The invention is suitable for the technical field of engineering machinery safety control, and provides a forklift anti-rollover self-adaptive balance control system and method, and the system comprises a sensor group, a controller and an execution mechanism group. The sensor group detects vehicle body postures, cargo weight and road conditions; the controller automatically identifies working conditions such as flat ground, ramp and high-position stacking according to the data and calculates a safety coefficient; and the executing mechanism group comprises a vehicle body leveling mechanism capable of adjusting left and right suspensions and a door frame posture adjusting mechanism capable of actively adjusting postures. The controller can command the two mechanisms to work in different cooperation modes according to different recognition results, for example, the two mechanisms mainly adjust a vehicle body on a ramp, stabilize the vehicle body and goods when the goods are stacked at high positions, and preferentially stabilize the goods and then switch the vehicle under the most dangerous composite working condition. According to the method, passive alarm is changed into active cooperative adjustment, and the working efficiency is effectively guaranteed while the operation safety of the forklift under the complex working condition is improved.

The invention discloses a lifting type hanging frame and a construction operation platform with the lifting type hanging frame. The lifting type hanger comprises a hanger body and two sets of vertical lifting devices, multiple layers of functional areas are arranged in the hanger body, and the two sets of vertical lifting devices are connected with the two ends of the top of the hanger body respectively and used for driving the hanger body to ascend and descend. The construction operation platform comprises an annular main body truss and lifting type hanging frames, a plurality of extension trusses are arranged on the upper portion of the inner side of the main body truss in the circumferential direction of the main body truss at intervals, and the multiple lifting type hanging frames are distributed below the positions between every two adjacent extension trusses correspondingly. The two vertical lifting devices at the two ends of the hanger body are fixed to the lower ends of the two adjacent extension trusses correspondingly. According to the lifting type hanging frame, the height of the hanging frame can be flexibly adjusted, it is guaranteed that each functional area can be lifted to the corresponding construction layer during operation, the construction progress is effectively guaranteed, the overall height of the hanging frame is effectively reduced through the lifting type design, the weight is reduced, and the safety coefficient is improved.

The invention discloses a high-balance self-calibration type hydraulic pile driver, and relates to the technical field of building construction equipment. The pile driver comprises a supporting base, a guide rail frame is installed on the top of the supporting base, and a pile driver head is arranged on one side of the guide rail frame; a correction assembly is arranged on the top of the supporting base and comprises a balance box installed on the top of the supporting base. By arranging the correcting assembly and the balancing assembly, when a balancing instrument detects that the supporting base deviates, a hydraulic rod acts immediately to push a moving block and a toothed plate to move, then a gear is driven to drive a fixed shaft and a rotating plate to rotate, a balance weight disc swings in the opposite direction, and the gravity center position of the whole machine is actively changed in the process; the reverse balance moment is generated, and the upsetting moment generated by piling can be automatically counteracted in real time, so that the skew trend of the guide rail frame is inhibited from the source, the stability and the safety coefficient of equipment in continuous high-strength operation are remarkably improved, and the vertical accuracy of piling is ensured.

The application discloses a full-automatic feeding and discharging machine for a hot press, which comprises a rack, a material taking and arranging mechanism for sucking blank materials to a positioning mechanism to arrange the blank materials in a blank plate on a first material moving mechanism, the positioning mechanism, the first material moving mechanism, a robot feeding and discharging mechanism for carrying the blank plate into the hot press and carrying finished products in the hot press out to the second material moving mechanism, a second material moving mechanism for moving the finished products into a second cooling mechanism to cool the finished products and then moving the finished products into a finished product discharging mechanism, a first cooling mechanism, a second cooling mechanism, the finished product discharging mechanism, a blank material conveying belt and a finished product conveying belt. The application can complete a series of automatic work such as automatic feeding, sucking and arranging of the blank materials into the blank plate, automatic feeding of the blank plate, automatic discharging, cooling and feeding of the finished products, and the like, has high automation degree and production efficiency, needs less manual intervention, has high safety coefficient and is suitable for large-scale production.

The utility model relates to the technical field of roof anti-falling, and provides an anti-falling system for roof construction, which comprises an anti-falling mechanism and a rope mechanism, the anti-falling mechanism comprises locking pliers and a telescopic fixing frame, and the telescopic fixing frame comprises a first mounting column, a second mounting column and a shear fork type assembly. The first mounting column and the second mounting column are both provided with locking pliers, the shear fork type assembly comprises multiple sets of shear forks connected with one another, each set of shear fork comprises a first shear fork arm and a second shear fork arm which are connected in a crossed mode, the first shear fork arm of the shear fork located at the head end is hinged to the first mounting column in a sliding mode, and the second shear fork arm of the shear fork located at the head end is hinged to the first mounting column; the first shear fork arm of the shear fork located at the tail end is hinged to the second mounting column, and the second shear fork arm is slidably hinged to the second mounting column; the rope mechanism is mounted on at least one of the first mounting column and the second mounting column. Therefore, the safety coefficient and the working efficiency of roof operation can be remarkably improved, the risk of high-altitude falling accidents is effectively reduced, and reliable guarantee is provided for high-altitude operation.

The invention discloses a high-safety-coefficient dual-system air blower and relates to the technical field of air blowers, the high-safety-coefficient dual-system air blower comprises a main body, air blowers are fixedly connected to the two sides of the main body, an air inlet channel and an air outlet channel are fixedly connected to the side face of the main body and the side faces of the air blowers, and an air inlet is formed in the side face of the main body; a main conveying pipeline fixedly penetrates through the side face, away from the air inlet, of the main body, a control box is arranged on the side face of the main body, and an independent cavity opening and closing mechanism is arranged in the main body. Through mutual cooperation of the driving motor, the threaded sleeve, the displacement plate and other assemblies of the independent cavity opening and closing mechanism, rapid isolation and recovery of fault units are achieved through the independent cavity opening and closing mechanism, single-side or double-side fault processing is supported, it is ensured that the air blower supplies air continuously in the maintenance period, the system reliability and the production efficiency are greatly improved, and the production cost is reduced. The maintenance port is independently designed, so that targeted maintenance is facilitated, the maintenance difficulty and downtime are reduced, and the whole machine does not need to be shut down for maintenance.

The utility model discloses an integrated shaft type right-angle planetary reducer which comprises a machine shell, a first-stage speed reducing mechanism and a second-stage speed reducing mechanism, the first-stage speed reducing mechanism and the second-stage speed reducing mechanism are used for speed reduction, and the first-stage speed reducing mechanism and the second-stage speed reducing mechanism are both arranged in the machine shell. According to the integrated shaft type right-angle planetary reducer, the first-stage speed reducer achieves speed reduction through tooth number difference matching of a main transmission gear shaft and a driven spiral bevel gear, the interior of the driven spiral bevel gear is kept stable through a center shaft, and the second-stage speed reducer achieves speed reduction through matching of a planet shaft, a planet gear, a sun gear and a planet carrier; the speed reducer has the advantages of being high in speed reduction transmission stability, high in rotating speed, low in torque input, low in rotating speed and large in torque output, free of over-positioning in overall installation, high in safety coefficient, high in working efficiency, high in bearing capacity and suitable for large-capacity stirrers.

The invention discloses a braking force self-adaptive compensation method and system for an EBS of a commercial vehicle, and belongs to the technical field of braking of the EBS of the commercial vehicle. The method comprises the steps that signals are collected and processed, and target braking torque is output; the target air pressure value of each axle is calculated by combining vehicle load distribution, and a brake chamber is driven to execute braking; establishing a historical database; the same kind of working condition data is compared during next braking, and if the braking deceleration is abnormal, a compensation mechanism is triggered; the method comprises the steps of firstly calculating a difference value of braking deceleration and determining basic compensation air pressure amount; then whether the abrasion state of the brake is consistent or not is diagnosed, comprehensive compensation air pressure is calculated in combination with the difference value of braking deceleration, the braking air pressure is adjusted, and braking force self-adaptive compensation is achieved; the historical database is established through a three-level data verification mechanism. The braking force can be better distributed, the stability and flexibility of the braking force are guaranteed, a driver can effectively control the braking force, and the safety coefficient and the comfort performance of braking are guaranteed.

The invention relates to the technical field of safety monitoring and early warning, and particularly provides a safety monitoring system and method for a coal mine underground reservoir coal pillar dam body. The system comprises a data acquisition device configured to be used for acquiring real-time monitoring data of a coal mine underground reservoir coal pillar dam body and sending the real-time monitoring data to a data analysis device; wherein the real-time monitoring data comprises deformation monitoring data, stress monitoring data, water body monitoring data and meteorological monitoring data; the data analysis device is configured to be used for receiving the real-time monitoring data; substituting the real-time monitoring data into a pre-constructed safety coefficient calculation model to obtain a current safety coefficient of the coal pillar dam body; if the current safety coefficient meets a preset early warning condition, starting an early warning device, and sending an early warning result corresponding to the current safety coefficient to the early warning device; and the early warning device is configured to receive the early warning result and perform early warning based on the early warning result. The safety monitoring accuracy of the coal mine underground reservoir coal pillar dam body can be improved.

The invention relates to a life prediction method for an automobile differential system, which comprises the following steps of: 1) dividing working conditions according to a motion relation between a planetary gear and a half axle gear of the automobile differential system, and constructing a differential system finite element model; 2) performing stress analysis on the plurality of working conditions to obtain a stress matrix table of each torque and stress parameter under different working conditions; 3) acquiring a durability load spectrum in a whole vehicle durability test and stress cycle times under different torques; and 4) combining the S-N curve of each part of the differential system to obtain the safety coefficient of each part, and predicting the service life. According to the method, a differential system finite element model is established by distinguishing two types of working conditions, a stress matrix table is generated through targeted stress analysis, the number of stress cycles is obtained in combination with a load spectrum, the safety coefficient is calculated by means of a part S-N curve and a Miner rule, the stress rule of the real working condition can be accurately captured, and the service life prediction precision is improved. The high reliability requirement of a new energy automobile differential system is met, and key technical support is provided for research and development and reliability guarantee of the new energy automobile differential system.

The utility model relates to the technical field of lifting hooks, in particular to an anti-falling lifting hook which comprises a hook head, an anti-falling device, a baffle hook head and a locking assembly, the baffle hook head comprises a head end and a sharp tail end, the baffle anti-falling device is connected with the head end of the baffle hook head in a sliding mode, and the baffle locking assembly is installed at the head end of the baffle hook head and abuts against the baffle anti-falling device. When one end of the baffle anti-falling device slides to the sharp tail end of the baffle hook head, the baffle locking assembly can lock the baffle anti-falling device. According to the utility model, the anti-falling safety coefficient can be effectively improved.

The application discloses an electrical control method of a UAV gas detector and relates to the electrical control field. The actual pressure difference is calculated by acquiring the pressure of the sample gas side and the zero gas side. The target pressure difference is set according to the safety threshold and the switching direction of the two-position three-way electromagnetic valve. The actual pressure difference is regulated by the zero branch micro valve filling and discharging zero gas. The zero gas flow and the regulation duration are calculated. The external safety belt Boolean quantity is defined according to the preset pressure difference. The valve coil current of the two-position three-way electromagnetic valve is controlled according to the external safety belt Boolean quantity. The transition zone state Boolean quantity is defined according to the valve coil current. Then, the transition zone duration is calculated. The transition zone equivalent orifice area is acquired. The worst backflow volume and the worst backflow volume are calculated. The micro spray volume is calculated. The safety coefficient is preset, and the hedging micro spray flow is started. If the micro spray volume is insufficient, the minimum cleaning volume is calculated. The zero branch micro valve is used for quantitative cleaning, so that the zero gas branch is pure, and the detection accuracy and stability of the UAV gas detector are improved.

The invention provides a method for calculating the safety coefficient of a core pile-cement soil interface of a stiff composite pile. The method comprises the steps that statistical characteristic parameters of interface peak strength and residual strength are obtained according to an indoor shear test; geometric parameters of the pile foundation are obtained, and an interface is dispersed into micro units; a random field is constructed based on the coordinates of the micro-units, and correlation between the micro-units is calculated; setting a target failure probability, a safety coefficient initial interval and calculation precision; performing secondary Monte Carlo sampling to generate an intensity random variable, and assigning each micro-unit after correlation correction; judging the strength state of the micro-unit through a strength triggering threshold value, calculating the overall total resistance of an interface and a design external load, and performing statistics to obtain a failure probability; and adjusting the safety coefficient interval through reverse iteration and linear interpolation based on the target failure probability until the precision requirement is met, and outputting a final safety coefficient. The calculation result is accurate and reliable, and a scientific basis is provided for design and safety evaluation of the stiff composite pile.

The invention relates to the technical field of coal mine fully mechanized mining, in particular to a hydraulic support peak value checking and staged type selection parameter determining method under the dynamic load effect, which comprises the following steps: S1, acquiring and preprocessing support, wall caving and micro-seismic monitoring data before pressure relief or treatment; s2, the support resistance and the valve opening rate are counted according to a fixed time window, and the rib spalling depth and the microseismic strength are fused to form a statistical table; s3, calculating a dynamic load coefficient and constructing a dynamic load strength index, identifying a weighting dynamic load event and extracting a peak value; s4, staged according to the propulsion distance and statistics of resistance peak values and dynamic load coefficient peak values of all stages are carried out; s5, calculating stage rated working resistance according to the stage resistance peak value and the safety coefficient; and S6, screening the candidate stent which meets the condition and has the minimum rated resistance as a recommended model. According to the method, the dynamic load peak value checking of the hydraulic support and the quantitative determination of the staged model selection parameters are realized, and the safety and the economy of the model selection of the support are improved.

The invention discloses a high-strength anti-theft lock device of a bullet cabinet, and particularly relates to the technical field of bullet cabinets, the high-strength anti-theft lock device comprises a fine steel door, a fine steel door covering edge is welded to the outer side of the fine steel door, a high-definition wide-angle camera is fixedly mounted on one side of the fine steel door, and a fingerprint collector is arranged at the bottom of the high-definition wide-angle camera; an electronic lock is arranged on the rear side of the fingerprint collector, the electronic lock is fixedly installed in the stainless steel door, the fingerprint collector is fixedly installed on the front side of the stainless steel door, and lock rod frames are arranged on the top of the rear side of the stainless steel door, the bottom of the rear side of the stainless steel door and the side, close to the electronic lock, of the rear side of the stainless steel door. By arranging the safety controller, the fingerprint recognition module, the lock rod, the vibration detector and other structures, the bullet cabinet is high in safety coefficient, the situation of violent door dismounting can be effectively prevented, the safety of the bullet cabinet is remarkably improved, effective storage of guns and ammunition can be achieved, and the actual use effect of the bullet cabinet is good.

The utility model relates to the technical field of safety emergency protection ropes, and discloses an emergency protection rope for road and bridge engineering construction safety, which comprises a rope core, an outer braided rope arranged on the outer side of the rope core, and an anti-skid component arranged on the outer side of the rope core. The anti-skid assembly comprises a connecting sleeve, a spiral isolation strip, a mounting cavity, a convex ball, a lantern ring, an annular groove and a conical head, the rope core is sleeved with the connecting sleeve, and the spiral isolation strip is fixedly connected to the arc-shaped outer wall of the connecting sleeve. In the locking and connecting process of the emergency protection rope, the cavities reserved between the spiral isolation strips can achieve locking and skid resistance only by means of deformation of the cavities in the outer surfaces of the spiral isolation strips when the spiral isolation strips are wound or fastened. The problem that the safety coefficient is reduced after the emergency protection rope is abraded due to dragging or use time increase in the use process is solved, and the safe use effect of the emergency protection rope is guaranteed.

The invention provides a new energy automobile motor controller grid driving resistance adjusting method and system, and relates to the technical field of power electronics, and the method comprises the steps: obtaining the related parameters of a motor controller, the relevant parameters of the motor controller comprise a motor rotating speed, a motor output torque, a grid driving resistance, a direct current side power supply voltage and a current amplitude; calculating a real-time safety coefficient according to the rotating speed of the motor and the output torque of the motor; judging whether the motor controller is in a conventional enabling output state or not based on the working state and the fault information; judging whether the motor controller is in a power reduction output state or not; judging whether the parameter group is a second parameter group continuously and repeatedly; calculating the junction temperature of a power module of the motor controller, and judging whether the junction temperature is higher than a switching threshold value or not; and inputting a control instruction to the intelligent driving chip according to a judgment result of the parameter group, and starting a gate driving resistor parameter combination corresponding to the judgment result.

The invention belongs to the technical field of aircraft rudder design, and discloses an electrically-driven rudder floating zero calibration method, which comprises the following steps: setting the maximum mechanical length of an actuator of a rudder, arranging a current detection device on the actuator, implementing a ground marking test, increasing the output length of the actuator, and simultaneously measuring the stress of a rudder surface and the current of the actuator in real time. And according to the material strength and the safety coefficient of the control surface, selecting the value of the current of the actuator corresponding to the control surface stress under the corresponding safety coefficient as the floating zero mark of the rudder. By applying the designed floating zero position calibration and control method, the rudder can be completely closed in the zero position state, the stealth performance of the rudder surface can be improved, the flutter boundary is improved due to the increase of the overall thickness, in addition, the floating zero position of the rudder surface is actively pressed, a certain pre-tightening force is generated, and the stability of the rudder surface is improved. Free flapping of the upper and lower rudder surfaces of the rudder during air bumping and ground sliding can be effectively prevented, and the stealth performance of flight is improved.

The utility model relates to the technical field of electric vehicles, in particular to a power transmission system and an electric engineering vehicle, the power transmission system comprises a first box body, a first transmission mechanism and a driving mechanism, and the first box body is provided with a first mounting cavity; the first transmission mechanism is arranged in the first mounting cavity and comprises at least two first driving gears, a first input gear and a first output gear set, the at least two first driving gears are engaged with the first input gear, and the first input gear is in transmission connection with the first output gear set; the driving mechanism comprises at least two first drivers, and the at least two first drivers are in transmission connection with the at least two first driving gears in a one-to-one correspondence mode. The motion state of the electric engineering vehicle is adjusted by controlling the working number of the first drivers, the output torque of the first drivers and the rotating direction of the corresponding first driving gear. The problems of gear shifting impact, power interruption, high safety coefficient of required gears and space waste of a gearbox of a power transmission system are solved.

The application provides a kind of automatic motorcycle crank gear shaft sleeve interference fit installation device and its installation method, it mainly includes first automatic feeding mechanical arm, second automatic feeding mechanical arm, base fixture and hydraulic punch, the application realizes the automatic installation of motorcycle crank gear shaft sleeve interference fit.The application adopts first automatic feeding mechanical arm, second automatic feeding mechanical arm and base fixture, the first, second automatic feeding mechanical arm of the application realizes accurate capture, the structure of base fixture can realize accurate positioning, so as to improve the positioning accuracy of interference fit between motorcycle crank and gear shaft sleeve.The end of the first automatic feeding mechanical arm and the second automatic feeding mechanical arm of the application is equipped with a grabbing structure, two grabbing holes are respectively arranged in the two grabbing structures, so that fast automatic feeding and discharging can be realized and the material changing time is reduced, at the same time, the safety hazards caused by manual operation can be avoided, and the application has the characteristics of high safety factor.

The present application relates to the technical field of automobile stamping die, and particularly provides a method, system and device for determining the highest movement speed of a filling wedge, aiming to solve the problem that the movement speed of a cylinder itself obviously decreases to cause the reduction of punching frequency when a large cylinder diameter cylinder is selected to increase the thrust in the prior art. For this purpose, the method for determining the highest movement speed of the filling wedge comprises: obtaining filling wedge parameter information, which at least includes filling block parameters, shuttle block parameters and equipment parameters; determining the production rhythm and safety coefficient of the filling wedge based on the filling wedge parameter information; determining whether the safety coefficient meets the preset condition; and determining the highest movement speed of the filling wedge based on the production rhythm of the filling wedge when the safety coefficient meets the preset condition.

The utility model provides an integral synchronous unloading device for a support, and relates to the technical field of constructional engineering. The device comprises a joist assembly and a suspension assembly, and the joist assembly is arranged between the bailey beam and the steel pipe stand column and detachably connected with the steel pipe stand column; the suspension assembly comprises a suspension piece and a lifting device, the bottom end of the suspension piece is connected with the joist assembly, the top end of the suspension piece is connected with the lifting device, and the lifting device is arranged at the top of the bridge and can drive the suspension piece, the joist assembly and the bailey beam to ascend and descend. The method has the effect of being high in safety coefficient.

The invention provides a flywheel diaphragm weight reduction method and device, a medium, a processor and a flywheel diaphragm. The method comprises the steps that a bending moment distribution curve of a crankshaft system in an engine work period is obtained; calculating stress distribution and a fatigue safety coefficient of the flywheel diaphragm under the action of the bending moment of the bending moment distribution curve so as to determine a strength sensitive area of the flywheel diaphragm; the geometric boundary of a fan-shaped lightening hole of the flywheel diaphragm is determined, the two side edges of the fan-shaped lightening hole are aligned with the boundary of the strength sensitive area, and two concentric arcs are determined according to bolt assembly constraint; and checking the strength and torsional vibration characteristics of the flywheel diaphragm adopting the fan-shaped lightening hole structure under the dynamic load, and iteratively optimizing the side angle and the arc radius of the fan-shaped lightening hole until the flywheel diaphragm meets the strength allowance requirement and the torsional vibration response is within the allowable range. The problem that in the prior art, the weight reduction effect of a traditional elastic flywheel diaphragm structure is poor is solved.

This invention relates to the field of intelligent connected low-speed training vehicles, and discloses a method for generating obstacle avoidance paths for such vehicles. The method includes: acquiring vehicle positioning information, a predetermined driving path, and preset obstacle avoidance decision parameters, including obstacle avoidance distance, safety factor, obstacle avoidance path threshold, detour distance threshold, and filtering coefficient; when a static obstacle is detected on the predetermined driving path, acquiring its position and size information, and converting the position information to the vehicle coordinate system; determining the distance information between the vehicle and the static obstacle, determining the obstacle avoidance starting position based on the obstacle avoidance distance and distance information, and calculating the deflection angle based on the size information, distance information, and safety factor; generating an obstacle avoidance path based on the obstacle avoidance starting position, deflection angle, obstacle avoidance path threshold, detour distance threshold, and filtering coefficient, and generating a return path after the vehicle bypasses the static obstacle. This achieves automatic obstacle avoidance of static obstacles for intelligent connected low-speed training vehicles.

The invention discloses a built-in ultrasonic detection safety assessment method for a U-shaped tube bundle of a high-pressure heater of a power plant. The method comprises the following steps: S1, sampling a core detection area determined based on a flow field and a structure in the U-shaped tube bundle of the high-pressure heater; s2, cleaning the inner wall of the sampling tube bundle and calibrating an ultrasonic detection system; s3, performing spiral scanning on the sampling tube bundle by adopting a built-in rotary ultrasonic detection system to obtain wall thickness distribution data; s4, identifying a defect type based on the scanned image, determining the minimum residual wall thickness, and calculating a safety coefficient in combination with a bursting pressure formula; and S5, making a hierarchical maintenance decision based on the safety coefficient. Compared with the prior art, the built-in ultrasonic detection safety assessment method for the U-shaped tube bundle of the high-pressure heater of the power plant has the advantages of integrating area positioning, accurate detection, defect diagnosis and safety assessment.

The invention discloses a vehicle gear shifting control method and device, a mine car, a storage medium and a product, and the method comprises the steps: in the driving process of a target vehicle, when the load capacity of the target vehicle is detected to be greater than or equal to a preset load capacity through an Internet of Vehicles platform, and the driving position of the target vehicle is located in an electronic fence; the target gear switching information is sent to the vehicle-mounted terminal; the electronic fence is a preset geographic area in front of an uphill position and a downhill position in a preset driving route of the target vehicle; and the target gear switching information is transmitted to the instrument through the vehicle-mounted terminal, and voice broadcasting is conducted on the target gear switching information through the instrument so that a driver can switch the manual gear to the target gear. According to the technical scheme, the safety coefficient of the tramcar in the running process can be improved, and the operation efficiency of the tramcar is guaranteed.

The invention provides a rigidity and strength fatigue wear simulation analysis method and equipment for a clutch separation device and a medium, and belongs to the technical field of vehicle clutches. Three-dimensional models of a separation shifting fork shaft, a rocker arm and a gearbox front shell are obtained, and a finite element model is established based on the three-dimensional models; defining a constraint set point, a surface grid set, a contact relation, a material attribute and a grid type; and applying a first load to the surface grid set to establish pre-contact, and then applying a second load to perform static simulation. Extracting stress data to determine a dangerous position, and extracting displacement data to calculate torsional rigidity. And based on the dangerous position and second load cyclic loading, fatigue safety coefficient distribution is obtained, and bushing wear data are extracted to evaluate the wear condition. The rigidity, the fatigue life and the lining abrasion performance of the separation device are evaluated synchronously through simulation, a stress danger area and an abrasion overrun area are positioned, data support is provided for structural optimization and maintenance period formulation, the reliability of the clutch is improved, and the service life of the clutch is prolonged.