489 results about "Safety coefficient" patented technology

The invention relates to the technical field of automatic driving trajectory planning control, in particular to an optimal inter-vehicle time interval control method for cooperative cruise of a truck under a communication delay condition. According to the method, a layered control framework of truck cooperative cruise control is designed, and a vehicle safety inter-vehicle time interval model, a communication delay model and a queue collision safety model are constructed; the inter-vehicle time interval, the communication delay coefficient and the safety coefficient are quantified into space particles, optimization is carried out based on a particle swarm algorithm, and the optimal inter-vehicle time interval on the basis of guaranteeing the queue safety and the fuel economy is obtained; designing a longitudinal model predictive control (MPC) expected acceleration decision controller of truck cooperative cruise by considering multi-target constraints of safety and fuel economy in a vehicle following process to obtain an expected acceleration; and a load change-considered feedforward and active-disturbance-rejection control brake driving error compensation model is established, so that the anti-jamming capability of the model is enhanced, and the actual acceleration of the queue truck accurately follows the expected acceleration under the load change condition.

The invention relates to the technical field of power equipment detection and evaluation, in particular to a transformer anti-short-circuit capability evaluation method based on finite element micro-damage accumulation, which comprises the steps of constructing a transformer full-fault finite element model, simulating and calculating the mechanical strength and safety coefficient of a winding, establishing a micro-damage accumulation model and evaluating the mechanical life. Bidirectional coupling analysis is realized through iterative simulation, and the anti-short-circuit capability of the transformer is dynamically evaluated in real time. According to the method, transformer design parameters, short-circuit impact influences and micro-damage cumulative effects can be comprehensively considered, accurate evaluation and dynamic monitoring of the anti-short-circuit capability in the whole life cycle are achieved, and a scientific basis is provided for operation and maintenance decisions.

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 invention provides a pile foundation construction monitoring control method and system, and relates to the field of pile foundation construction.The method comprises the steps that operation parameters of construction equipment are obtained at multiple moments of a monitoring period; determining a safe operation coefficient of the construction equipment according to the operation parameters of the construction equipment; acquiring construction environment monitoring data of the construction area at a plurality of moments of the monitoring period; processing the construction environment monitoring data according to a trained construction environment risk prediction model, and determining a construction environment risk coefficient; acquiring pile foundation performance monitoring data at a plurality of moments of the monitoring period; according to the pile foundation performance monitoring data, the pile foundation safety coefficient is determined; and generating a monitoring control report according to the construction equipment safety operation coefficient, the construction environment risk coefficient and the pile foundation safety coefficient. According to the invention, the comprehensiveness of pile foundation construction monitoring control can be improved.

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 an under-mine environment accurate positioning system based on a UWB technology, and relates to the technical field of data processing and positioning, an underground area is divided into a safe area and a dangerous area by obtaining the structure risk value of each sub-area and combining the structure risk value and the position information of the corresponding sub-area, and the safe area and the dangerous area are accurately positioned. A plurality of rescue robots are arranged in the underground area; acquiring position information of the mobile tag, displaying the position information on an electronic map, generating an air quality coefficient, and dividing the plurality of sub-regions into risk regions and safety regions according to the air quality coefficient; and sending inquiry information to the miner, acquiring a corresponding safety coefficient, and if the acquired safety coefficient is lower than a safety threshold value, planning a support path to the miner for the rescue robot, so that the rescue robot rescues the miner along the support path. After the miner is found according to the position information of the miner, the miner is rescued through guidance of the rescue robot, and the miner is prevented from getting lost and being lost.

The present invention relates to the technical field of boiler manufacturing, and provides a weld seam structure suitable for a narrow gap water-cooled wall tube panel and a welding process. The weld seam structure comprises groove gaps formed between adjacent water-cooled wall tubes; joints are provided on the sides of the adjacent water-cooled wall tubes close to each other; the joints are distributed on the upper sides of the groove gaps, and the joints are communicated with the groove gaps; and the groove gaps comprise V-shaped grooves or U-shaped grooves. In addition to the original joints, adjacent water-cooled wall tubes are considered as a whole, and gaps formed between the water-cooled wall tubes are machined into groove gaps and welded with the joints, thereby increasing the thickness of a welding seam at a tangent point and the safety coefficient, facilitating ray radiographic inspection, and solving the technical problem of great hazards to the safe operation of units due to the fact that when the gaps between the adjacent water-cooled wall tubes are small, the welding quality at the tangent point position of the adjacent water-cooled wall tubes cannot be effectively guaranteed due to inconvenient observation, welding, and radiographic inspection.

The invention discloses a waterproof safety evaluation method and system for waterproof engineering, and belongs to the technical field of waterproofing of constructional engineering. According to the method, the waterproof safety level is comprehensively evaluated by determining an engineering structure defect quantitative index, setting a reference crack width Ws, measuring a waterproof material or engineering re-waterproof performance index Wm and calculating a waterproof safety coefficient K = Wm / Ws. The system evaluates grades based on the method, and selects corresponding waterproof materials and construction methods according to engineering importance, expected deformation and service life. According to the invention, concepts of'waterproof performance 'and'waterproof safety coefficient' are put forward for the first time, a quantitative evaluation system oriented to waterproof performance is established, the defects of heavy form and light actual effect of current specifications are effectively overcome, the transformation from'form compliance 'to'performance standard' is realized, the reliability, durability and economy of waterproof engineering are remarkably improved, and the method is suitable for popularization and application. And a scientific basis is provided for engineering design, material selection and acceptance.

The invention provides a sleeve testing device and a strength checking and correcting method, and relates to the technical field of offshore high temperature and high pressure, and the device comprises a temperature control system which is used for providing a steady-state high-temperature simulation environment and a transient high-temperature simulation environment for a sleeve sample; the loading system is used for applying axial, radial and internal loads to the casing sample; the monitoring system is used for monitoring a surface temperature field, inner wall strain and leakage of the casing sample; and the data processing and control unit is respectively connected with the temperature control system, the loading system and the monitoring system. The method adopts the device and comprises the following steps: selecting a casing sample, fixing a sensor and completing initial calibration; heating the whole casing pipe and keeping the temperature constant, and applying instantaneous thermal shock to a specific area; synchronously applying axial, radial and internal loads; cooperatively monitoring the temperature field, the strain and the leakage rate to form an associated database; and correcting the safety coefficient. The invention solves the problems of single test temperature and insufficient load coupling of the traditional casing, and is suitable for casing performance evaluation.

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 relates to the technical field of slope reinforcement, and provides a micro pile combination reinforcement method for a highway expansive soil slope, which comprises the following steps: when the current stability safety coefficient, the current uplift bearing capacity, the current shear strength and the current flexural bearing capacity all meet the corresponding preset conditions, taking the current design size parameter as the final design size parameter; and according to the final design size parameters, the grouting amount of each hole in a first pile of the steel pipe pile assembly and the grouting amount of each hole in a second pile of the cast-in-place pile assembly are determined, and the steel pipe pile assembly is constructed on the slope bottom face of the expansive soil slope according to the grouting amount of each hole in the first pile. And then a cast-in-place pile assembly is constructed on the slope face of the expansive soil slope according to the grouting amount of each hole in the second pile. According to the method, the influence of the expansive soil property on design and construction of the micro piles is fully considered, interaction and combined arrangement of the micro cast-in-place piles and the micro grouting steel pipe piles are integrated, the safety and reliability of slope reinforcement are guaranteed, material waste caused by excessive conservative is avoided, and operability is high.

The invention relates to the technical field of protective devices, in particular to a protective device self-adaptive to crane loads. According to the technical scheme, the device comprises a main body, an installation plate is fixedly installed at the bottom of the main body, an operation table is installed on the main body in a sliding mode, a mooring rope is rotatably installed in the operation table, a hook is rotatably installed at one end of the mooring rope, and the device further comprises a stabilizing mechanism which is arranged at the bottom of the main body and used for fixing the hook in horizontal sliding. The hook is fixed in the hoisting process, uneven stress of the cable caused by shaking is avoided, meanwhile, the cable is buffered in the transportation process, the cable is prevented from being broken, objects are transported stably, and the safety coefficient is high.

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 provides a high-voltage electricity approaching safety early warning method, system and device for an automobile crane, and belongs to the technical field of engineering machinery safety protection. Comprising the steps of collecting an electric field signal radiated by a high-voltage line, reversely deducing a distance based on an electric field intensity attenuation model, and calculating an azimuth angle of a charged body through a MUSIC algorithm; controlling a laser radar to perform high-density scanning within a set angle according to the azimuth angle to obtain three-dimensional point cloud data of the high-voltage line; time synchronization and coordinate registration are carried out on the electromagnetic sensing array and laser radar data, a three-dimensional space model of the high-voltage line is established after fusion, and the shortest distance between the three-dimensional space model and a suspension arm is calculated; identifying a voltage level, calculating a basic safety distance, correcting by combining an environment factor, and multiplying by a safety coefficient to obtain a dynamic safety threshold value; and according to the real-time distance between the suspension arm and the electrified body, triggering graded early warning and control actions. According to the invention, the problem of measurement deviation of a single sensor under complex electromagnetic environment, changeable illumination and meteorological working conditions is solved.

The invention discloses a double-rocker-arm derrick hoisting working condition intelligent analysis and stability improvement method, and relates to the technical field of power grid assemblage construction equipment. Working condition data of a derrick are collected in real time, and stability analysis is carried out based on the working condition data to obtain a safety coefficient representing the stability of the current working condition; the risk assessment of the hoisting operation process is realized; furthermore, a corresponding stability improvement strategy is executed based on the safety coefficient and / or the real-time working condition data, so that the system has the capabilities of intelligent decision making and active intervention, the limitation that judgment depends on artificial experience in the prior art is broken through, the stability guarantee of the derrick is converted into active regulation and control from passive protection, and the reliability of the derrick is improved. And the operation safety and decision-making scientificity under the extreme height and complex environment are obviously 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 Z-shaped propeller underwater turnover installation method based on dynamic mechanical analysis, and relates to the technical field of ship propulsion system installation. Comprising the steps that S1, a comprehensive stress safety coefficient is obtained through sensor data and a mechanical model, and the water flow resultant force is corrected; s2, a hoisting mode is determined according to the allowable turning-over angle of the propeller, and meanwhile real-time hoisting is conducted according to the actual turning-over angle of the propeller; and S3, the propeller and the propeller base are attached through the guide rail and the hydraulic buffer system. According to the invention, the tension of the sling is automatically adjusted through the preset threshold value and the comprehensive stress safety coefficient, so that the stress of the sling in the hoisting process can be ensured to be always within a safety range, and the risk of sling breakage or propeller overturning is avoided; and the influence of water flow change on the propeller is dynamically corrected, so that the hoisting stability under complex sea conditions is improved.

The utility model provides a spring bearing device. Comprising a transmission table, a transmission assembly is arranged on the inner side of the transmission table, a lifting assembly is arranged at the top of the transmission table, and protection assemblies are arranged on the inner side, close to the left side and the right side, of the lifting assembly. According to the spring bearing device, all parts of the device are arranged in a matched mode, the double-end motor drives the two second bevel gears to rotate, the double-end motor is meshed with the first bevel gear to drive the rotating rod to rotate, and the rotating rod drives the transmission gears on the two sides to rotate; a transmission gear rotates on a rack to complete displacement, so that the stability and the balance of the device are improved, two second protection plates are adjusted to a proper distance under the action of a protection assembly, and after being separated from the winding device, a wound spring stably falls into a bearing frame, so that the safety coefficient of the device is increased, and the device is convenient to use. And accidents caused by rolling of the high-temperature winding spring are avoided.

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.

A method for determining the optimal pull-out strength of anchor bolts in reinforced slopes, belonging to the field of slope reinforcement technology, includes: establishing a mathematical model of the anchor bolt-reinforced slope; obtaining curves showing the relationship between the slope safety factor and the pull-out strength of anchor bolts under different numbers and bond lengths; obtaining curves showing the variation of slope failure probability and anchor bolt pull-out strength under different numbers and bond lengths; and obtaining the optimal design value of the pull-out strength of anchor bolts in the reinforced slope. This method introduces the failure probability into anchor bolt support engineering, reflecting the reliability of the slope anchor bolt support engineering through the failure probability; and effectively obtains the relationship between pull-out strength and the number of anchor bolts, bond strength and slope stability coefficient. In slope reinforcement engineering, the pull-out characteristics of anchor bolts are fully utilized. The optimal pull-out strength corresponds to the number of anchor bolts and the bond strength, avoiding waste of engineering materials and improving the economy of the support engineering while ensuring slope safety.

The utility model relates to an adjustable embracing type seat which comprises a seat body, a seat back is arranged on the rear portion of the seat body, armrests are arranged on the two sides of the seat body respectively, and the armrests are matched with the seat body through an adjustable embracing assembly. According to the utility model, the motor is adopted to control the rotation angle of the adjustable encircling assembly, so that the encircling width of the armrests on the two sides of the seat can be adjusted, and further, more automatic safety protection with higher crowd adaptability can be realized; after being adjusted in place, the device can be further tightened based on requirements, so that the device is suitable for people with different protection preferences, the requirements of body protection are met, and the protection requirements of part of users on the psychological level can also be met; the safety protection device is particularly suitable for safety protection of VR game or VR experience equipment, so that the safety coefficient of the seat in the game or experience process is improved while a more comfortable sitting posture is provided for a user.

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 shockproof fixing devices, and discloses a hydrogen conveying pipeline shockproof fixing device for a hydrogen energy automobile, which comprises a hydrogen pipe and a hydraulic damping rod, the outer side of the hydrogen pipe is fixedly sleeved with an I-shaped sleeve, and the left end and the right end of the hydraulic damping rod are fixedly sleeved with bearings. The hydraulic damping rods are rotationally installed in the I-shaped sleeve through bearings, a fixing piece is fixedly connected between the left end and the right end of the hydraulic damping rod on the lower side, a shock absorber is fixedly installed at the lower end of the fixing piece, and supporting arms are fixedly connected to the left ends and the right ends of the hydraulic damping rods on the front side and the rear side correspondingly. And connecting shafts are fixedly connected between the lower ends of the supporting arms. Shockproof protection is provided for the hydrogen pipe in all directions, the risks of pipeline deformation and fatigue cracks caused by vibration are greatly reduced, the service life of the pipeline is effectively prolonged, the running safety coefficient of a hydrogen energy automobile is improved, meanwhile, installation is convenient, and tedious operation of traditional bolt connection is abandoned.

The utility model discloses an intelligent security protection device with high maintenance safety factor, comprising a first mounting column and a second mounting column, the top of the first mounting column is provided with a movable groove, the top of the first mounting column is rotatably connected with a movable shaft, and the bottom of the second mounting column is fixedly connected to the outer side of the movable shaft. The side, close to the top, of the second mounting column is fixedly connected with a mounting plate. The top of the mounting plate is fixedly connected with a camera. A connecting rod is arranged on one side of the first mounting column, bevel gears are fixedly connected to the top end of the connecting rod and the end, close to the connecting rod, of the movable shaft and are in meshed connection, and a control assembly is arranged on the side, close to the bottom end, of the connecting rod and used for driving the connecting rod to rotate. Through the structure, the first mounting column and the second mounting column are movably and rotatably connected, so that the camera can be conveniently moved to a lower position for maintenance work, maintenance personnel can be ensured to operate at a safer and more comfortable position, and the efficiency and the safety of the maintenance work are greatly improved.

The utility model relates to a material receiving module after circular saw web stamping, which comprises a disc, storage rods and a driving motor, the storage rods are distributed at preset positions of the disc, and the storage rods are fixedly connected with the disc; the driving motor drives the disc to rotate, so that the storage rods rotate along with the disc; and the storage rod is used for receiving products stamped by the stamping equipment. According to the material receiving module for the stamped circular saw blade, the structure is simple, the automation degree is high, and the working efficiency of material receiving is improved; and secondly, due to the existence of a brake mechanism and a detection sensor, the operation safety coefficient of the material receiving module is improved.

The collision buffering protection mechanism for the constructional engineering comprises a box body, a movable cover is arranged at the top end of the box body, an auxiliary rod is fixedly connected to one side of the movable cover, a long lever is arranged on one side of the auxiliary rod, a short lever is fixedly connected to one side of the long lever, and a base is fixedly connected to one side of the short lever. A connecting block is fixedly connected to the bottom end of the base, a spur rack is arranged in the connecting block, a threaded rail is arranged on one side of the spur rack, a rotating disc is fixedly connected to one side of the threaded rail, a connecting rod is fixedly connected to one side of the rotating disc, and a fixing iron sheet is arranged on the periphery of the spur rack. Through the structure, when the lifting table ascends out, the movable cover is automatically opened, a certain buffering capacity is achieved when the device is impacted, the device is flexible to use and high in safety coefficient, the rotating disc can drive the movable cover to be opened and closed, some precise instruments are stored in the device, it can be guaranteed that the precise instruments are not collided, and opening and closing are convenient.

A kind of truck wheel structure of rolling steel, including hub (1), spoke (2) and rim (3), it is characterized in that, wheel diameter is 840mm, the thickness of rim (3) is 60mm, the inner diameter of rim (3) is 720mm, the aperture of hub (1) is 210mm, overall weight is 314kg.The application increases the thickness of rim from 50mm of HESA wheel to 60mm under the premise of ensuring that the mass of wheel does not increase, which will not increase the unsprung mass, suitable for both 70t level truck, also can be used for 60t level truck.The relative HESA wheel of existing 70t level truck has the technical characteristics of high safety factor, light wheel weight, wide application range, and good application prospect.

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 invention discloses an NVH strategy construction method for a control strategy of a motor controller, and relates to the field of vibration noise prediction, and the method comprises the steps: obtaining the electromagnetic noise order of a motor body, and generating the electromagnetic noise order O1 of a motor; acquiring a switching frequency noise order of the controller, and generating a switching frequency noise order O2 of the motor; according to the electromagnetic noise order O1 of the motor and the switching frequency noise order O2 of the motor, generating an actual operation safety coefficient sigma 1; obtaining a preset target threshold value, and judging whether the safety coefficient sigma 1 is greater than the preset target threshold value or not; if yes, it is judged that the risk of coupling amplification of the switching frequency noise and the electromagnetic noise of the motor body does not exist; if the safety coefficient sigma 1 is smaller than the preset target threshold value, it is judged that the risk that the switching frequency noise and the motor body electromagnetic noise are coupled and amplified exists, and the smaller the safety coefficient sigma 1 is, the higher the risk is; and according to a judgment result, optimizing the noise when the switching frequency noise order coincides with the electromagnetic noise order of the motor body.