65 results about "Maximum displacement" patented technology

The invention discloses a power turbine rotor structure design method, which belongs to the technical field of aero-engines, and comprises the following steps: arranging an oil film damper according to strain energy distribution and vibration mode; performing structure optimization on the power turbine rotor according to the radial deformation condition of the connection interface; designing the sectional wall thickness of the power turbine shaft; a balance boss is arranged on the outer wall of the maximum displacement position in each order of vibration mode power turbine shaft; and the gap between the central pull rod of the power turbine rotor and the power turbine disc is designed according to the maximum vibration displacement of the power turbine disc. According to the invention, the oil film dampers are arranged at reasonable positions, so that the rotor has good vibration reduction; connection interface deformation coordination calculation is carried out, a connection structure is optimized, and the connection interface is not damaged under long-term work; and designing and optimizing the segmented shaft wall thickness, optimizing and designing the critical rotating speed margin, considering the influence of the limit unbalance on the gap, and realizing a good dynamic balance characteristic.

The application relates to the technical field of magnetic sensors, and specifically provides a magnet for a sensor and a magnetization method thereof, the magnet comprising: the magnet is in a circular-arc tile structure, and the length of the magnet is equal to or greater than the maximum displacement stroke capable of being detected by the sensor; the magnetization direction of the magnet adopts one of the length, thickness or circular-arc radial direction of the magnet. The magnetization method comprises the following steps: selecting the material of the magnet and determining the size of the magnet according to the maximum displacement stroke capable of being detected by the sensor, and manufacturing a magnet block in a circular-arc tile structure; determining the magnetization direction of the magnet according to the relationship between the magnetic induction intensity of the sensor and the rotary displacement position and the rotary angle based on the Hall effect; the magnetization direction adopts one of the length, thickness or circular-arc radial direction of the magnet; calculating the magnetization data of the magnet; and magnetizing the magnet block according to the magnetization direction and the magnetization data to obtain the magnet for the sensor. The application can improve the rotary displacement measurement precision of the sensor.

The application provides an oil fume machine vibration testing device and a design method thereof, and relates to the technical field of oil fume machine vibration testing equipment. The design method mainly comprises the following steps: constructing a finite element model of the target oil fume machine vibration testing device; determining whether all the natural frequencies of the finite element model are located outside a preset motor excitation frequency range; if not, modifying the current finite element model to pass the modal checking stage; for the finite element model that passes the modal checking stage, applying a preset virtual load at the motor installation position to perform vibration simulation, and determining whether the maximum displacement is greater than or equal to a predetermined threshold; if not, modifying the current finite element model to pass the stiffness checking stage, and repeating the modal checking stage; iteratively performing the modal checking stage and the stiffness checking stage. Through the embodiments provided in the application, the oil fume machine vibration testing device designed can simulate the vibration of the oil fume machine during operation, and reduce the influence of resonance and forced vibration.

The invention relates to the technical field of structure testing, in particular to an overhead rigid suspension expansion joint fatigue test device and method, and the device comprises a fatigue host module which provides reciprocating vertical vibration power for an expansion joint; the comprehensive platform module is used for providing reciprocating horizontal vibration power for the fatigue host module; the control system module comprises a strain data processing unit which is used for constructing a three-dimensional strain field model and calculating stress distribution based on the strain data; the phase compensation generation unit dynamically generates lag compensation time of the horizontal vibration relative to the vertical vibration; and the driving control unit is used for adjusting the phase of the horizontal vibration in real time based on the lag compensation time, so that the horizontal vibration reaches the maximum displacement value at the vertical vibration peak moment. According to the invention, the authenticity, accuracy and reliability of the fatigue test of the expansion joint can be effectively improved, the phase and displacement synchronization of horizontal vibration and vertical vibration can be dynamically adjusted through a linkage control mechanism, and the spatial multidirectional composite fatigue load in actual operation can be reproduced.

A building structure comprising a plurality of elements extending from a ground surface with at least a first element connected to a second element by a coupling member, the coupling member including a damping element for damping vibrations in the building structure and a means for limiting the deformation of the damping element when the relative movement exceeds a maximum displacement at which damage occurs to the damping element.

The invention provides a technology capable of detecting abnormality of a hydrogen tank even if the hydrogen tank is not damaged. A method for inspecting a hydrogen tank having a cylindrical portion and two dome portions provided at both ends of the cylindrical portion includes: a step of filling the hydrogen tank with a fluid and applying a predetermined pressure; a step for acquiring a determined displacement amount, which is determined to be the maximum maximum value of the maximum displacement amount in the radial direction of the hydrogen tank at the dome portion or the maximum value of the displacement amount changing from increasing to decreasing; and a step for outputting the presence of an abnormality in the hydrogen tank when it is determined that the displacement amount is equal to or greater than the predetermined threshold value.

A rubber-metal shock absorber with pre-adjustment for transferring directional loads and torsional displacement forces, especially for passenger car bogies, comprising a package consisting of at least two and not more than five elastic rubber elements (1) and a separator plate (2) separating the closest surfaces of the elastic rubber elements (1) from each other, and furthermore a first plate (3) and a second plate (4) which adhere to the outer, outer surfaces of the elastic rubber elements (1) respectively, and an upper guide pin (5) and a lower guide pin (7).The elastic rubber element (1) is a disc formed from rubber with fire resistance of at least category R9 for level HL2 and hardness in the range from 42 to 78 Sh°A, wherein for the set composed of elastic rubber elements (1) and the separator plate their design relation of maximum displacements, its design relation with the extended range of individual displacements, where in the design relation of the maximum lateral displacement in relation to the width A of the second plate (4) and the length E of the second plate (4) if these values ​​are equal or only to the width A of the second plate (4) if the length E of the second plate (4) is greater than the width A of the base of the second plate (4) and for displacements in the X direction it has an increase AX of at least 29%, and in the Y direction it has an increase AY of at least 12%.

To provide a torsion response prediction method and a torsion response prediction device capable of easily evaluating torsion response caused by foundation input motion of a building located on irregular ground.SOLUTION: Calculating respective impedance ratios α γ = (γ 1 * Vs1) / (γ 2 * Vs2) of the stratum structures 1 and 2, where Vs1 and Vs2 are respective shear wave velocities of the stratum structures 1 and 2, and γ 1 and γ 2 are respective wet densities of the stratum structures 1 and 2, and calculating an area ratio β = A1 / (A2 + 2A1) from respective basic cross-sectional areas A1 and A2 of the stratum structures 1 and 2; A response analysis of a one dimensional soil column model is performed with respect to each of the layer structures 1 and 2, maximum displacements D1 and D2 of the grounds of the layer structures 1 and 2 are calculated, a difference in ground displacement Δ D = D1 - D2 is obtained, and a rotation angle θ max of the building caused by a base input motion is calculated using the following equation θ max = = p * (Δ D·L) q·α γ / β using preset coefficients p and q with a base length L of the building.SELECTED DRAWING: Figure 2

The invention discloses a post-earthquake damage state identification method, device and system, and a storage medium. The method comprises the following steps: step 1, obtaining a nonlinear effective energy dissipation factor of a pier; 2, replacing the maximum displacement with residual displacement to serve as a deformation damage item, and redefining an energy damage item by introducing a nonlinear effective energy dissipation factor to obtain a post-earthquake damage evaluation model; 3, fitting key parameters of the post-earthquake damage evaluation model; and 4, verifying the post-earthquake damage evaluation model after parameter fitting by adopting quasi-static test data. By adopting the technical scheme of the invention, the damage state of the pier can be quickly, quantitatively and accurately identified.

This invention relates to the field of machining technology, and discloses a method, system, and equipment for controlling the machining accuracy of component structures based on digital twins. It comprehensively considers constraints such as the maximum displacement, stiffness, and dimensional tolerances of the components to ensure key performance indicators such as component quality, stress, and fundamental frequency, constructing a multi-objective optimization analysis model to obtain the optimal machining tolerances for each machining part of the component. Then, by analyzing the normalized sensitivity characteristics of the dimensional tolerances of each machining part to the objective function, the machining sequence is optimized. During the actual machining process of the components according to the machining sequence, the absolute deviation between the actual tolerance and the optimal machining tolerance of the machining part is collected in real time. If the absolute deviation exceeds a preset deviation threshold, the optimal machining tolerance for subsequent machining parts is iteratively updated. This invention achieves precise control and optimization of machining tolerances during the component machining process, ensuring assembly deviations and improving the safety of the component structure.

The application provides a length simulation calculation method for metal hoses for engines based on a finite element method, comprising the following steps: S1, importing a metal hose model into finite element software; S2, establishing a connection relationship between components; S3, calculating the maximum displacement of a servo actuator in the X direction under a follow-up coordinate system according to the maximum swing angle requirement of the engine; S4, setting the displacement-time load of the lower support point of the first servo actuator in the X direction under the first follow-up coordinate system, setting the displacement-time load of the lower support point of the second servo actuator in the X direction under the second follow-up coordinate system, and setting the total analysis step time; S5, performing transient dynamics analysis to simulate the maximum angle circle swing of the engine under the double servo actuators; and S6, observing the swing animation diagram according to the calculation result to analyze whether the length deformation of the metal hose is coordinated.

The invention discloses a method for predicting the maximum displacement of a dredging ship gauge pile. The method comprises the following steps: constructing a trolley-gauge pile-soil body coupling numerical model based on ABAQUS software; establishing a cubic polynomial regression model of the maximum displacement of the gauge pile with respect to the three influence factors by applying a response surface method; data samples are stochastic in a regression model parameter range, and a training set, a verification set and a prediction set are divided; constructing a BP neural network model, and training and testing the BP neural network model by using the training set and the verification set to obtain an optimized prediction model; and inputting influence factors of the prediction set into the trained BP neural network for prediction, performing dual verification on a prediction result by using a relative error and a determination coefficient, and outputting the prediction result when the prediction result meets a verification standard. According to the method, high-precision real-time prediction of the displacement of the gauge pile is realized, and an important decision basis is provided for safe construction of a dredging ship.

The invention discloses a well cementation injection displacement determination method and device. The method comprises the steps that the structural size of a shaft, well cementation fluid performance and well cementation fluid injection information are obtained; according to the structural size of the shaft, the performance of the well cementation fluid and the injection information of the well cementation fluid, the position distribution of the well cementation fluid in the shaft is determined; according to the position distribution of the well cementation fluids in the shaft, hydrostatic column pressure of each position is calculated, and according to the hydrostatic column pressure of each position, a friction resistance pressure drop window of each stratum of the shaft is determined; according to the friction resistance pressure drop window of each stratum of the shaft, a displacement window of each stratum is obtained through bisection iteration solution; the displacement window comprises a maximum displacement curve and a minimum displacement curve; and according to the displacement window, in combination with the well cementation fluid injection information, the well cementation injection displacement is determined, and therefore the problem that in the prior art, the well cementation injection displacement cannot be determined is solved.

The invention discloses a thermal bearing stable structure topological optimization method for a high-precision coordinate boring machine, and relates to the field of machine tool structure topological optimizing.The method comprises the steps that a design domain and a non-design domain are defined according to the appearance requirement of the coordinate boring machine structure, and a thermal coupling finite element model is established; performing density filtering and projection on the design variable field to obtain a physical variable field, and parameterizing to represent a machine tool complete machine and component integrated model; establishing a design response of a mean value and a variance of the maximum displacement amplitudes of multiple working conditions; constructing a heat bearing stable structure topological optimization model for the high-precision coordinate boring machine; solving a finite element model under various thermal coupling working conditions, calculating each design response, and carrying out sensitivity analysis; and solving the topological optimization model by adopting a moving asymptote algorithm to obtain a topological optimization result. According to the method, the integral expression of the whole machine tool and the bearing part structure is applied to the structure topology optimization model, the multi-gear mechanical performance of a moving part is comprehensively considered, and the thermal bearing stability of an optimization result is improved.

A kind of whole ship finite element batch calculation and post-processing method, comprising the following steps: S1: according to FPSO working sea area environmental condition and the large number of combined working conditions of assembly load, establish FPSO ship wet surface model;S2: the FPSO ship wet surface model is passed through wave load to ship surface batch generation load file;S3: according to ship data and the latest thickness data of ship, establish FPSO whole ship finite element model, S4: the whole ship finite element model is grouped and named according to ship structure and ship steel material properties;S5: obtain the whole ship stress value and maximum displacement batch file under each group working condition;S6: using ANSYS post1 post-processing module exports the stress value and maximum displacement batch txt file of whole ship area of interest;S7: the stress value and maximum displacement batch data of whole ship area of interest are analyzed and output result, the present application provides strong support for the safety and reliability of FPSO and the establishment of proxy model.

The application discloses a large-angle spherical hinge support for a column double eccentric compression test, which comprises a bottom plate, a spherical hinge assembly is arranged on the bottom plate, the upper end of the spherical hinge assembly is connected with a spherical hinge plate, an upper sliding rail group is arranged at the spherical hinge plate, a lower sliding rail group is arranged at the bottom plate, a connecting rod assembly is arranged between the upper sliding rail group and the lower sliding rail group, and the connecting rod assembly ensures large-angle rotation of the spherical hinge assembly. The large-angle rotation is realized by adjusting the matching relationship between the hemispherical body in the spherical hinge plate and the groove body in the bottom basin, and the upper sliding rail group and the lower sliding rail group provide a sliding and rotating adjustment support base for the connecting rod assembly. The large-angle bidirectional rotation can be realized by the sliding steel bars and the connecting rod assembly, the spherical hinge plate and the bottom basin are in surface-to-surface contact, the contact stress area is larger than that of the traditional line contact, the peak stress on the contact surface is reduced, meanwhile, the connecting rod assembly on the outer side can limit the maximum displacement of the bidirectional hinge of the support, and the test piece is prevented from being separated from the support.

The invention relates to the technical field of machining, and discloses a part structure machining precision control method, system and equipment based on digital twinning, which comprehensively considers constraint conditions such as maximum displacement, rigidity and dimensional tolerance of parts so as to ensure key performance indexes such as quality, stress and fundamental frequency of the parts to construct a multi-objective optimization analysis model. Obtaining the optimal machining tolerance of each machining part of the part; analyzing the normalized sensitivity characteristic value of the dimensional tolerance of each processing part to the target function so as to optimize the processing sequence; and in the actual part machining process according to the machining sequence, the absolute deviation between the actual tolerance and the optimal machining tolerance of the machined part is collected in real time, and if the absolute deviation exceeds a preset deviation threshold value, the optimal machining tolerance of the subsequent machined part is iteratively updated. The machining tolerance of the part machining process is accurately controlled and optimized, the assembly deviation of the part is ensured, and the safety of the part structure is also improved.

The invention discloses a control system and a control method for screwing and unscrewing drill rod threads of a power head type drilling machine, and particularly relates to the technical field of geological drilling equipment.When a buckle is not screwed and unscrewed, a pilot control reversing valve and a first three-position four-way reversing valve control a power head motor to rotate forwards and backwards, and a second three-position four-way reversing valve controls a feeding oil cylinder to move; the second power head motor controls the pressure reducing valve to autonomously adjust the motor displacement; when the shackle is screwed, the fourth three-position four-way reversing valve controls the oil cylinder of the clamp holder to clamp the drill rod; the first power head motor controls the pressure reducing valve to adjust the motor to the maximum displacement, the pilot control reversing valve and the first three-position four-way valve control the motor to rotate forwards and backwards, the pilot control reversing valve controls the first two-position two-way valve or the second two-position two-way valve to change positions, and the first power head motor controls the pressure reducing valve to control the third three-position four-way valve to change positions. The third three-position four-way valve controls the feeding oil cylinder to move, the axial movement of the power head is controlled through inching, the drill rod is matched with thread screwing-in or screwing-out, displacement is compensated, the self weight is balanced, and the drill rod screwing and unscrewing efficiency is improved.

The application discloses a vertical cyclic loading test system applied to a geotechnical centrifuge and a control method, which comprises a model box, a counterforce mechanism, a vertical loading mechanism and an electrical control mechanism, the counterforce mechanism is fixed on the top of the model box, the vertical loading mechanism is vertically installed on the counterforce mechanism, and the vertical and horizontal position of the vertical loading mechanism on the counterforce mechanism is adjustable, the application can stably work under a high centrifugal acceleration of 160g, the maximum loading force reaches 400kN, the control precision is 0.2kN, the maximum displacement stroke is 160mm, the displacement precision is 0.1mm, the cyclic loading frequency is 1Hz, and the cyclic amplitude is ±30mm, so that the simulation requirement of most high bearing capacity working conditions of marine engineering, pile foundation engineering and the like can be met.

The invention discloses a nonlinear coupling control method and device for piezoelectric dispensing and a medium, and relates to the technical field of precise dispensing and motion control. The method comprises the following steps: acquiring structural parameters of the dispensing system, and establishing a nonlinear kinetic model of the dispensing system; performing parameter scanning and sensitivity index calculation on the structure parameters through a nonlinear kinetic model to obtain key parameters of which the response to the dispensing system is greater than a preset threshold value; constructing a multi-objective optimization function taking the maximum displacement, the maximum speed and the vibration amplitude of the firing pin as performance objectives; building a joint simulation platform, and importing the key parameters into the joint simulation platform to obtain real-time response energy of the firing pin; adjusting a weight coefficient of the multi-objective optimization function; and performing iterative simulation and iterative adjustment through an optimization algorithm to obtain an optimal parameter combination of the key parameters. According to the method, the platform is optimized by fusing nonlinear dynamic modeling and joint simulation, and the movement performance of the firing pin and the overall stability of the dispensing system are improved.

The invention relates to a method for operating a tamping machine (1), which travels along a track (2) and comprises a tamping unit (9) which can be adjusted relative to a machine frame (23) and which has tamping tines (10) that can be displaced relative to one another, wherein position data of track sleepers (3) are captured before a tamping operation. Prior to each tamping operation, a permissible maximum displacement path (smax) is specified for each tamping tine (10) by means of a computing unit (44) depending on a current position of the tamping unit (9) relative to the track sleeper (3) to be currently tamped. This specification of a permissible maximum displacement path (smax) for each tamping tine (10) ensures that the displacement operation achieves the greatest possible effectiveness, and damage to the sleeper and / or the respective tamping tine (10) and to the ballast is reliably avoided.

The invention provides a dynamic blade tip clearance control method for an axial flow fan. The dynamic blade tip clearance control method comprises the following steps that S1, a multi-physical field coupling analysis model of an impeller-frame system is constructed; s2, on the basis of the multi-physics field coupling analysis model, simulating calculation is conducted on the maximum radial displacement delta Rrootor of the impeller and the minimum radial displacement delta Rhousing of the inner circle of the frame, and the dynamic envelope range of the outer edge of the impeller and the dynamic envelope range of the inner edge of the frame under the design working condition are obtained; s3, calculating a minimum safety gap required between the impeller and the frame; and S4, according to the minimum safety clearance delta min obtained through calculation, fan mechanical design is guided, and it is ensured that the actual assembly blade tip clearance is larger than or equal to delta min. According to the method, the minimum safety clearance is accurately calculated, fan design and manufacturing are guided, and minimization and optimization of the blade tip clearance are achieved on the premise that operation interference is avoided.

The present application relates to the technical field of earthquake engineering, and provides a method for determining the seismic response of an engineering site under the action of a seismogenic fault, comprising the following steps: S1, determining the bedrock surface of the engineering site; S2, establishing the scale range of the engineering site; S3, selecting near-fault ground motion records and site categories for inputting seismic waves; S4, outputting the site response under the input of ground motion; and S5, outputting the site response under the input of dislocation. 地表 The dislocation input of the finite element software site earthquake is used to obtain the surface displacement deformation characteristics and select the maximum displacement value D 位移 The present application provides a method for selecting near-fault ground motion records considering dislocation in a consistent manner for the site classification of the input mode of the calculation and analysis of the seismogenic fault engineering site, respectively strips the seismic input of the acceleration time history and the bedrock dislocation amount input, and is closer to the actual earthquake disaster, so as to provide reasonable design parameters for the seismic design of the engineering structure and the design of the anti-fracture capacity.

Provided is an adjustable roll sizer apparatus (10) for ammunition cases, said apparatus (10) comprising a main body (12) defining a cradle (14) and an adjustment channel (16) to the cradle (14), a shim receptacle (18) defined at a confluence of the cradle (14) and channel (26), as well as a circular cam disc (20) rotatably mounted within the cradle (14) and defining a camming circumference (22). Apparatus (10) further includes an idler roller (24) rotatably mounted within the cradle (14) proximate the shim receptacle (18), an urging assembly (26) arranged within the adjustment channel (16) and comprising a mounting plate (28) fast with the main body (12) and a roller block (30) slidably arranged in the adjustment channel (16) and mounted to the mounting plate (28) with the roller block (30) having a pinch roller (32). Apparatus (10) further includes an adjustment mechanism (34) mounting the roller block (30) to the mounting plate (28), the adjustment mechanism (34) comprising an urger (36) configured to urge the pinch roller (32) into the cradle (14) and an adjustor (38) configured to set a limit of maximum displacement of the pinch roller (32) from the cradle (14), and a rotational actuator (40) configured to rotate the cam disc (20), wherein the cam disc (20), idler roller (24) and pinch roller (32) complementarily form a rolling point (42) between them and over the shim receptacle (18) in which a shim (44) is receivable to determine a length of a case (8) that is roll-sizable within the rolling point (42).

This invention relates to a multi-parameter optimization method for suspended tunnel structures under wave conditions, belonging to the field of tunnel structures. Based on existing methods for calculating the dynamic response of suspended tunnels under wave loads, this method uses the maximum horizontal and vertical displacements at key control positions of the suspended tunnel under wave loads as optimization targets to optimize parameters such as the buoyancy ratio, anchor cable inclination angle, anchor cable installation angle, submersion depth, and cross-sectional parameters. Previous methods for optimizing suspended tunnel structures typically use the magnitude of the stress on the structure as the optimization target, neglecting the dynamic response of the structure under wave loads. The proposed method uses the maximum displacement at key control positions as the optimization target. Furthermore, the proposed method comprehensively considers multiple structural parameters, allowing for flexible selection of parameters at key structural positions based on actual design requirements. Therefore, the proposed method has good applicability to different structural design requirements.

The invention discloses a fracturing method for reducing fracture disturbance fault influence, which comprises the following steps of: determining the maximum displacement and the maximum injection liquid amount of first-section fracturing construction according to fault type, fault extension condition, distance between fault and fracturing section and micro-fracture development degree, performing first-section fracturing construction by taking supercritical carbon dioxide as preposed liquid, and performing second-section fracturing construction by taking supercritical carbon dioxide as preposed liquid; determining the minimum time interval of the adjacent construction sections according to the distance between the fault and the fracturing sections, the spatial distribution of the microseism events monitored in the fracturing construction of the first section and the development degree of the microfractures between the two fracturing sections and the fault; re-checking the micro-fracture development degree between the fracturing section and the fault, and determining the maximum displacement and the maximum liquid injection amount of the fracturing construction of the second section; and second-section fracturing construction is conducted based on the minimum time interval, and the steps are repeated till fracturing construction of all sections is completed. The method can be directly applied to an oil and gas development site, the disturbance influence of fracturing on a fault is greatly reduced, and the purpose of safe fracturing is achieved.

The invention relates to the technical field of oil and gas field development yield increase operation fracturing construction, and discloses a multi-pump displacement compensation control method based on precomputation, which comprises the following steps of: configuring the load grade, the rated displacement and the maximum displacement of each pump skid; calculating an online standby margin; when a pump skid breaks down, displacement compensation is calculated; and calculating to obtain the calculated displacement of all the on-line pump skid, and executing compensation. The invention further discloses a multi-pump displacement compensation control system based on pre-calculation. According to the multi-pump displacement compensation control method and system based on pre-calculation, the problem of displacement fluctuation caused by pump skid shutdown in fracturing construction is solved, and the construction stability, the equipment utilization rate and the automation level are improved.

The invention relates to the technical field of steel structure installation, in particular to an accurate butt joint positioning method based on large-span bidirectional fish-bellied steel truss installation, which comprises the following steps: acquiring a plurality of measuring points on each truss, and obtaining structural form data of each measuring point according to the elevation and plane position of each measuring point; in any installation execution step, constructing an overall displacement vector of the truss structure according to the truss structure corresponding to each measuring point, and extracting relative displacement corresponding to each measuring point based on the variation trend of the overall displacement vector; according to the attitude of the truss structure where the measuring points are located, the distance change rate of the adjacent measuring points is calculated according to the relative displacement, and the deformation type corresponding to each measuring point is defined; combining the overall displacement and the relative displacement under different deformation types into displacement, circularly judging the displacement under each installation step, and determining a key node corresponding to each installation step; and feeding back the mounting precision of each measuring point according to the maximum displacement of the key node. And the positioning precision and efficiency during installation of the truss are improved.

The invention discloses a method for calibrating the flow pressure difference value of an exploration drilling machine, and relates to the technical field of exploration drilling machines. The calibration method comprises the steps that liquid flow is output through a load-sensitive pump, and the flow direction of the liquid flow is controlled through a load-sensitive valve; then the power head motor is controlled to rotate forwards and backwards, and after the rotating speed of the drill rod driven by the power head motor to rotate is detected through a rotating speed sensor, a detected output rotating speed signal is processed through an electrical program, and the rotating speed of the drill rod is displayed on a display screen; when the power head motor works, an adjusting screw on the flow differential pressure adjusting valve is adjusted, so that the calculated maximum rotating speed when the load-sensitive pump reaches the maximum displacement is displayed on the display screen, the maximum rotating speed is just the flow differential pressure value required to be set by the exploration drilling machine, the adjusting screw on the flow differential pressure adjusting valve is locked, and calibration is completed. The calibration of the flow pressure difference value can be completed without disassembling and assembling a pipeline and adding extra equipment, and the method is high in efficiency, low in cost, simple and reliable.