52 results about "Torsional angle" patented technology

The invention belongs to the field of medical instruments, and particularly relates to a fusion cage system which comprises a fusion cage mechanism provided with a first end and a second end, the fusion cage mechanism is bent to be in an annular shape, and the fusion cage mechanism comprises an upper contact piece and a lower contact piece which are oppositely arranged; the first connecting piece is elastically connected between the upper contact piece and the lower contact piece; the implanting mechanism comprises a main body and a second connecting piece, and the second connecting piece penetrates through the main body to be connected with the fusion cage mechanism; the adjusting structure comprises a driver and a third connecting piece which are connected, the third connecting piece is connected with the implanting mechanism, and the relative position of the first end and the second end of the fusion cage mechanism is adjusted by changing the driver so as to adjust the torsion angle of the fusion cage mechanism till the fusion cage mechanism is attached to the surfaces of the upper vertebral body end plate and the lower vertebral body end plate. Through the arrangement, the fusion cage system is adapted to an implantation environment.

The utility model relates to the field of torsional spring detection, in particular to a torsional spring detection positioning tool. The torsion spring detecting and positioning tool comprises a positioning shaft, a first limiting part and a second limiting part. The positioning shaft is used for sleeving and positioning the torsion spring, and the first limiting part is convexly arranged relative to the peripheral surface of the positioning shaft and is used for limiting and fixing a group of torsion arms of the torsion spring sleeving the positioning shaft; the second limiting part is detachably arranged relative to the positioning shaft and used for abutting against the other set of torsion arms of the torsion spring, and the second limiting part is matched with the first limiting part and the positioning shaft to twist the torsion spring and keep the torsion spring at a preset torsion angle. According to the torsion spring detection positioning tool, the convenience of installation and fixation of the torsion spring is improved, the torsion spring can be kept at the torsion angle corresponding to the working state and is immersed in high-temperature oil, and the torsion spring detection efficiency is improved.

According to the upper limb forearm and wrist rehabilitation mechanism based on the double-layer four-rod tensioning structure, the overall tensioning structure is combined with the mechanism design, and the rigid-flexible mixed characteristic of the overall tensioning structure composed of the four-rod flexible stretching unit and the four-rod rigid compression unit is utilized; the problems that a traditional rehabilitation mechanism is too complex, a driving device is huge, and equipment light weight is insufficient are solved. A wrist support seat in the wrist rehabilitation mechanism is connected with an upper fixing ring in the forearm tensioning integral mechanism through a bolt. Compared with the prior art, the invention has the following technical effects: the rigid-flexible mixed characteristic of the tensegrity structure is utilized to meet the requirements of motion of each degree of freedom, meanwhile, the structure of the exoskeleton is simplified, the lightweight design is realized, and the torsion angle can be increased and the flexibility can be improved through the mutual compensation of the internal length in the motion process. And the overall height of the mechanism can be kept unchanged.

The invention relates to the technical field of screw joint test piece testing, and discloses a multi-angle quantitative torsion testing device suitable for a tension-shear screw joint, which comprises two transverse plates arranged in a frame body, round openings formed in the side walls of the two transverse plates, sleeves mounted in the round openings, opening binding parts arranged at the upper ends of the sleeves, and fixing heads arranged at the opening binding parts, a single-nail lap joint test piece is installed on the fixing head, a torsion mechanism is installed in the sleeve, the torsion mechanism is used for adjusting the angle of the fixing head to install the single-nail lap joint test piece and can provide lateral force to test the strength of the single-nail lap joint test piece after screw joint, and rectangular openings are formed in the two opposite sides of the frame body. According to the multi-angle quantitative torsion testing device suitable for the tension-shear screw joint, performance testing of a tension-shear complex force system can be carried out at a constant torsion angle or torque fixation under different-angle loading of the tension-shear screw joint, and researchers can conveniently carry out performance testing and analysis of quantitative tensile force and quantitative torsion angle.

The invention relates to a torsion angle description and analysis method of a sectional material bending and torsion component, and relates to the field of advanced manufacturing of complex sectional material bending components. The method comprises the following steps: respectively extracting NURBS parameters on edges and a center line of a section bending and twisting component, carrying out parameterized point distribution according to an arc length to obtain curvatures and coordinates of all points on a curve, and finally calculating section torsion angles at different positions on the center line by constructing a torsion vector and a projection plane and combining matrix transformation. Under the condition, a torsion angle parameter analysis method is provided for manufacturing the section bending and twisting component through the six-axis free bending and twisting technology, the torsion angle change of the section bending and twisting component along all the sections of the axis can be accurately described, and the manufacturing precision of the six-axis free bending and twisting technology is further improved; in addition, the method is simple, feasible and high in analysis efficiency, and has important engineering application value and obvious economic benefits in the fields of aerospace and new energy automobiles.

The invention relates to an axle motion instantaneous center analysis method and device, computer equipment and a medium. The axle motion instantaneous center analysis method comprises the steps that the incidence relation between the moving horizontal distance of a first center of a single plate spring in a spring assembly after longitudinal torsional deformation and the relative distance of a spring eye and the incidence relation between the effective half length and the longitudinal torsional angle of the single plate spring are obtained; differentiating the longitudinal torsion angle to obtain a proportional relation between the first vertical position and the relative distance of the spring eye; the first vertical position is the position of the first instantaneous center of the single leaf spring in the vertical direction of the first coordinate system; when the number of the plate springs is multiple, a second vertical position is obtained based on the correction coefficient of the correction proportional relation, the number of the plate springs, the effective half length of the non-main-leaf plate springs and the effective half length of the main-leaf plate springs; the second vertical position is the position of the second instantaneous center of the plurality of plate springs in the vertical direction of the second coordinate system; and based on the second vertical position and the horizontal position of the second instantaneous center, the movement instantaneous center position of the axle located at the second center of the multiple leaf springs is determined. According to the method, the accurate position of the axle movement instantaneous center can be obtained.

A stress-strain relationship estimation method according to the present invention comprises: a step (S1) for performing a torsion test on a first round bar test piece (10) to obtain a relationship between a torsion torque and a torsion angle; a step (S3) in which a torsion test is performed on a second round bar test piece (10) having a parallel section (11) having a smaller radius than the first round bar test piece (10), and the relationship between the torsion torque and the torsion angle is obtained; a step (S5) in which the relationship between the shear stress and the surface shear strain is obtained on the basis of the relationship between the torsion torque and the torsion angle obtained by the respective torsion tests of the first round bar test piece (10) and the second round bar test piece (10); and a step (S7) in which the shear stress and the surface shear strain are converted into uniaxial tensile stress and strain, and the relationship between the stress and the strain is estimated.

The present invention discloses a band saw blade and a method for processing the torsion angle thereof. The method comprises defining a three-dimensional coordinate system and a straight line L; controlling a processing tool to move to an initial position, wherein the initial position refers to a position in which the working surface of the processing tool coincides with the straight line L and the lowest point of the working surface is located at point A, which is located on the straight line L and above the origin O; controlling the band saw blade to move along the X-axis so that the tip of the tooth to be ground of the band saw blade is located at the origin O; determining the type of tooth to be ground; and controlling the rotation and movement of a grinding wheel based on the type of tooth to be ground to achieve torsion angle processing. The present invention achieves torsion angle processing control by controlling the deflection angle of the grinding wheel, greatly improving the processing accuracy of the torsion angle, thereby improving the performance and stability of the band saw blade.

The utility model provides a device for testing the torsion angle of a composite hose. The device comprises a dial assembly and a pointer assembly, a base of the dial assembly and a pointer in the pointer assembly can synchronously rotate with one end of the composite hose, and the dial does not rotate under the action of the rotation limiting piece and keeps an initial state; in the process that the pressure of the composite hose reaches a specified value, along with the synchronous rotation of the pointer and the non-rotation of the dial, the torsion degree of one end of the composite hose can be visually observed, and secondary calculation by testers is not needed.

The invention provides a missile wing bending and torsion angle measuring device and method. The method can be used for measuring the deformation angle of the missile wing on the ground under the no-load condition and can also be used for measuring the deformation angle of the missile wing under the loading condition. The device has the advantages of being simple in structure, convenient to install, adjustable in rigidity, high in stability and good in reliability, effectively solves the problem that the relative torsion angle of a missile wing is difficult to measure after the missile wing is assembled on a bomb, can meet the requirement that the device does not shake back and forth in the working process, guarantees the stability of a measurement system in the measurement process, and improves the measurement accuracy. According to the special structural form, structural parts of different sizes can be customized according to different aerial bomb weight grades and missile wing specifications and sizes.

The present application belongs to the field of medical devices, and specifically relates to a fusion device system, comprising: a fusion device mechanism having a first end and a second end, the fusion device mechanism being curved and annular, the fusion device mechanism comprising an upper contact member and a lower contact member arranged opposite to each other, and a first connector elastically connecting the upper contact member and the lower contact member; an implant mechanism comprising a main body and a second connector, the second connector passing through the main body and connected to the fusion device mechanism; an adjustment structure comprising a connected driver and a third connector, the third connector being connected to the implant mechanism, and adjusting the relative position of the first and second ends of the fusion device mechanism by changing the driver to adjust the torsion angle of the fusion device mechanism until it fits with the surfaces of the upper and lower vertebral endplates. The above-mentioned configuration is used to adapt the fusion device system to the implantation environment.

This invention discloses a torsion angle measuring device for torsion testing, comprising a specimen and an encoder. The encoder's rotating shaft is coaxially connected to the specimen via a connecting frame, enabling the rotating shaft to rotate coaxially with the specimen. The encoder is configured to acquire the torsion angle signal of the specimen through the rotation of the rotating shaft. This invention, by directly connecting the encoder's rotating shaft coaxially with the specimen, effectively eliminates errors in traditional indirect measurements, facilitating in-situ high-precision measurement of the torsion angle. This direct connection significantly improves the measurement sensitivity for small torsional deformations, accurately capturing minute angular changes in the specimen as it approaches its fatigue limit. Simultaneously, it simplifies the measurement process, avoids signal attenuation and interference during transmission, and ensures that the obtained torsion angle data more accurately reflects the initiation and development of cracks within the specimen.

The invention discloses a torsion self-resetting damper and a mounting method thereof, the torsion self-resetting damper comprises a shell, the shell is provided with an external connecting plate, the external connecting plate is sequentially provided with a connecting part, a torsion energy dissipation part and a self-resetting part along the length direction, the connecting part is connected with a building structural member, and the self-resetting part is connected with the torsion energy dissipation part. Racks are arranged on the upper face or / and the lower face of the torsion energy dissipation part, and reset curved faces are arranged on the upper face or / and the lower face of the self-reset part. A torsion energy consumption device matched with the torsion energy consumption part and a self-resetting device matched with the resetting curved surface are mounted in the shell; according to the torsion damper, the torsion angle of the bar is amplified through the gear, the torsion energy dissipation device and the self-resetting device are arranged, so that the energy dissipation capacity of the torsion bar can be fully exerted under small displacement of the torsion damper, and meanwhile residual deformation of the structure is reduced through the self-resetting device.

The utility model belongs to the field of aircraft structure design, and particularly relates to a double-shear torsion bar type sealing plate which comprises a hanging belt plate, a sealing skin, a torsion bar, a torsion support and a fixed support. The hanging belt plate and the sealing skin are arranged on the two sides of the torsion bar respectively. Square torsion heads are arranged at the two ends and the middle of the torsion bar, square torsion holes are formed in one end of the hanging belt plate, the torsion support and the fixed support, and the square torsion holes are connected with the corresponding square torsion heads on the torsion bar. After assembly is completed, the rear edge of the sealing skin is pushed by the control surface structure so that the sealing skin can rotate around the axis of the torsion bar, and the torsion bar is in a torsional deformation state and provides restoring force for the sealing skin. That is, large displacement formed by swinging of the rear edge of the sealing skin is achieved through torsional deformation of the torsion bar, so that stress and strain on the sealing plate are greatly reduced. The size of the torsion driving force can be adjusted by adjusting the size of the preset torsion angle. The torsion bar is small in occupied space and simple and reliable in torsion mechanism.

The utility model discloses a kind of angle meters for detecting tibia torsion, belong to orthopedics medical detection instrument technical field.The angle meter includes mounting seat, symmetrically arranged measuring claw and angle disc assembly.Measuring claw is linked by engaging tooth, adjustable spacing to adapt to different tibia size;Angle disc integrates level and pointer, and realizes non-radiation, high-precision in-situ measurement in combination with laser pointer.Through medial and lateral reference points of ankle joint, torsion angle is quickly positioned and read, solve the problem of traditional X-ray radiation risk and mechanical tool positioning inaccuracy.The utility model compact structure, convenient operation is applicable to the quick detection of clinical tibia torsion angle.

The invention discloses a transmission system performance test method, a computer readable storage medium and a test device. Comprising the following steps: controlling a driving piece to perform linear loading at a first loading torque and a first loading slope; a torsion angle < {in1} of the input shaft, a torsion angle < {out1} of the first output shaft and a torsion angle < {out2} of the second output shaft are obtained, and a relative gap value at the moment is calculated; controlling the driving piece to perform linear loading at a second loading torque and a second loading slope; a torsion angle < {in2} of the input shaft, a torsion angle < {out3} of the first output shaft and a torsion angle < {out4} of the second output shaft are obtained, and a relative gap value at the moment is calculated; and calculating the transmission clearance of the to-be-measured transmission system. Therefore, according to the performance test method provided by the invention, the rotation torque and the torsion angle are accurately measured, and the transmission gap of the to-be-tested transmission system is calculated through the two relative gap values, so that the measurement accuracy can be improved, the manual dependence is low, the automation degree is high, and the operation efficiency is high.

An annuloplasty device configured to mechanically strain annulus tissue while delivering structural disruption energy to induce plastic deformation. In some embodiments, the mechanical distortion includes vacuum-induced attachment to the tissue, optionally with or without additional manipulation to tension or stretch the tissue. In some embodiments, the mechanical distortion includes torsional deformation of the tissue. Optionally, the torsional deformation is limited by the device to a predetermined torsional angle, e.g., in the range of 60° to 120°. In some embodiments, the torsional deformation includes rotating an axis extending between tissue-implanting pins of the device from a first angle oblique to a local circumferential direction, through an intermediate angle perpendicular to the local circumferential direction, to a second such angle. In some embodiments, a non-penetrating transducer delivers structural disruption energy via a surface that contacts the annulus tissue.

The present invention is such that, when viewed along the central axis thereof, the start point phase of a first discharge groove is located in a range of +10° to +90° with respect to a center cutting edge, the end point phase of the first discharge groove is located in a range of -40° to 0° with respect to the center cutting edge, the start point phase of a second discharge groove is located in a range of +10° to +90° with respect to an outer peripheral blade, and the end point phase of the second discharge groove is located in a range of -40° to 0° with respect to the outer peripheral blade. The first discharge groove has a first front groove section and a first rear groove section connected to the first front groove section. The second discharge groove has a second front groove section and a second rear groove section connected to the second front groove section. The torsion angle of the first front groove section monotonically decreases when approaching the first rear groove section. The torsion angle of the second front groove section monotonically decreases when approaching the second rear groove section. The torsion angle of each of the first rear groove section and the second rear groove section is 0°.

The invention discloses a blade optimization method and device, a storage medium, an electronic device and a computer program product, and relates to the field of blades, and the blade optimization method comprises the following steps: determining a corresponding rated wind speed of a target blade under the condition of considering flexible deformation, the rated wind speed is the wind speed corresponding to the condition that the wind driven generator reaches the rated generation power; determining an aeroelastic torsional deformation angle of the blade section of the blade corresponding to the rated wind speed to obtain a target aeroelastic torsional deformation angle; and optimizing the pneumatic torsional angle of the blade section according to the target aeroelastic torsional deformation angle. By the adoption of the technical scheme, the problem that power is reduced due to flexible deformation of the blades is solved.

The utility model provides an anti-loose locking nut, which belongs to the technical field of fasteners, and aims to solve the problems that the conventional axial anti-loose locking nut needs to perform fine knob adjustment on a plurality of extrusion parts repeatedly in the fastening process, the operation is complicated and time-consuming, and the final torsion angle is easy to deviate. The three extrusion pieces are connected to the interior of the coating shell in a dispersed and threaded mode; the operation cover is arranged in front of the coating shell; the twisting shaft is rotationally connected to the interior of the operation cover; the operation assembly is arranged in the operation cover; and the locking assembly is arranged in the nut main body. The three keying pieces can be driven to rotate at completely consistent angles by rotating the twisting shaft, so that the amplitude of pressure applied to the three wedge blocks is consistent, the amplitude balance of the three wedge blocks in the moving process is realized, and the locking capability and the stability of a bolt or a screw rod are ensured.

The application relates to a torsion angle description and analysis method of a profile bending and twisting component, and relates to the advanced manufacturing field of complex profile bending components. NURBS parameters on the edges and the center line of the profile bending and twisting component are extracted respectively, parameterized dot distribution is carried out according to the arc length, the curvatures and coordinates of each point on the curve are obtained, a torsion vector and a projection plane are constructed, matrix transformation is combined, and finally the section torsion angles at different positions on the center line are calculated. In this case, the application provides an analysis method of the torsion angle parameters by adopting six-axis free bending and twisting technology to manufacture the profile bending and twisting component, the torsion angle change of each section of the profile bending and twisting component along the axis can be accurately described, and the manufacturing precision of the six-axis free bending and twisting technology is further improved. In addition, the method is simple and feasible, has high analysis efficiency, has important engineering application value in the fields of aviation and new energy vehicles, and has obvious economic benefits.

One aspect of this disclosure relates to a cutting tool comprising a shaft portion and two or more main cutting edges. The shaft portion extends along a central axis. The shaft portion has an outer peripheral surface. The outer peripheral surface surrounds the central axis. The two or more main cutting edges are arranged in a helical configuration on the outer peripheral surface. Each main cutting edge has a main cutting edge. The main cutting edge has a torsion angle. In the direction along the central axis, within ±30% of the cutting edge length of the region from the center of the region, the main cutting edge has at least one first slit portion and a second slit portion. The main cutting edge is formed in the region. The first slit portion and the second slit portion have torsion angles in opposite directions to the torsion angle. The relationship between the first slit portion and the second slit portion satisfies at least one of a first condition and a second condition. The first condition is that the width of the first slit portion is different from the width of the second slit portion. The second condition is that the depth of the first slit portion is different from the depth of the second slit portion.

The present invention relates to the technical field of deformation monitoring, and particularly to a measurement method and system for the deformation of the initial support steel arch of a tunnel, including: obtaining the strain data of each strain rod relative to the waist measurement point at each deformation monitoring point during the period to be measured; analyzing the movement of each strain rod according to the strain data corresponding to each deformation monitoring point during the period to be measured, and analyzing the deformation of different strain rods at the same deformation monitoring point in combination with the physical parameter information of the strain rods to obtain the deformation detection index of each strain rod at each deformation monitoring point during the period to be measured; obtaining the torsion angle detection index of each deformation monitoring point during the period to be measured according to the deformation detection index and the distance distribution between each deformation monitoring point and the waist measurement point; and judging the deformation early warning situation of the tunnel steel arch during the period to be measured by using the deformation detection index and the torsion angle detection index. The present invention makes the deformation monitoring result of the steel arch more comprehensive and improves the monitoring safety.

The invention relates to a numerical control three-dimensional spine correcting instrument and a key parameter setting method thereof.The numerical control three-dimensional spine correcting instrument comprises a rack, a head and chest plate, a hip and leg plate and a hip plate, the head and chest plate is arranged on a sliding rail base in a sliding mode along the y axis, the hip and leg plate can rotate around the x axis and the y axis respectively, and the hip plate is rotationally arranged on the hip and leg plate; the sliding rail seat is rotationally arranged on the rack, and the sliding rail seat rotates to enable one side, close to the hip-leg plate, of the head-chest plate to quickly jack up and down in the z-axis direction; the impact stroke of the head and chest plate is 30-100 mm and adjustable, the up-down fast jacking stroke of the head and chest plate is + 50--50 mm and adjustable, the angle formed by rotating the hip and leg plate around the x axis is + 15--25 degrees and adjustable, the angle formed by rotating the hip and leg plate around the y axis is 0-30 degrees and adjustable, and the torsion angle of the hip plate is 0-15 degrees and adjustable. The impact and fast jacking actions of the head-chest plate, the rotation action of the hip-leg plate around the y axis and the twisting action of the hip plate are required to be synchronously completed within 0.25 second. Various key actions of the traditional Chinese medicine spine correction technique are more accurately achieved, the accurately quantified three-dimensional actions act on the lesion intervertebral space at the same time, and the correction effect can be remarkably improved.

A clamp for measuring the torsion angle of a deformed steel bar longitudinal rib comprises an inspection rack and a cylinder support, the cylinder support is installed on the inspection rack, a cylinder is installed above one side of the cylinder support, a compression spring is arranged at the front end of a cylinder piston head, a connecting steel plate is welded to the tail end of the compression spring, one side of the connecting steel plate is connected with an upper clamping plate, and the other side of the connecting steel plate is connected with a lower clamping plate. The upper clamping plate is provided with an upper groove, the inspection rack is provided with a lower clamping plate, and the lower clamping plate is provided with a lower groove. The clamp has the advantages that the clamp is installed at the head end of an inspection rack, the head end of the deformed steel bar is fixed in the horizontal direction of a longitudinal rib, and a measurer can independently measure the torsion angle at the tail end of the deformed steel bar, so that single-person operation is achieved, more convenience is achieved, deviation caused by manual fixing of the head end of the deformed steel bar can be eliminated at the same time, and the measuring efficiency is improved. And economy and reliability are realized. The clamp can be suitable for clamping deformed steel bars of different specifications by replacing the upper clamping plate and the lower clamping plate, and detection efficiency and accuracy can be effectively improved.

The invention discloses a drive for enabling a wing to generate torsional deformation, and belongs to the field of morphing aircraft structure design. The drive device is composed of a motor, a drive shaft, a supporting plate, a worm, a cutting worm gear, a composite round pipe, a first connecting plate and a second connecting plate; and the first connecting plate and the second connecting plate are respectively positioned on webs of a fixed-section wing rib and a deformed-section wing rib of the wing. The driving shaft is connected to the fixed section wing rib through the connecting plate, the motor drives the worm and gear to drive the driving shaft to rotate, and the driving shaft transmits torque to the deformation section wing rib through the composite round pipe and drives the deformation section wing rib to rotate, so that the wing deformation section is subjected to torsional deformation. The direction and size of the torsion angle of the wing can be actively adjusted, and the scheme is high in feasibility and practicability. According to the invention, the worm gear and the worm are used for transmitting torque, so that controllable torsion angles are generated among different wing sections along the spanwise direction, and the torsion of the wing structure is realized.

The utility model relates to a large-torsion-angle comfortable lining which comprises an inner pipe and an outer ring arranged on the periphery of the inner pipe, and further comprises an inner ring, an inserting piece, a first rubber layer, a second rubber layer and a third rubber layer which are arranged between the inner pipe and the outer ring, the inner ring is arranged on the periphery of the inner pipe, the first rubber layer is arranged between the inner pipe and the inner ring, and the second rubber layer is arranged between the second rubber layer and the third rubber layer. The inserting piece is arranged on the periphery of the inner ring, the second rubber layer is arranged between the inner ring and the inserting piece, and the third rubber layer is arranged between the inserting piece and the outer ring. The inner ring is tubular, and the insertion sheets are arc-shaped sheets. Deformation of a large torsion angle can be achieved, the durability of the bushing is greatly improved, the rigidity of the bushing can be adjusted due to the receding structure, and the driving comfort is improved.

An active control system for suppressing swing and sway behaviors includes a first motor, a rotating plate, a sensor and a controller. The first motor is provided on a to-be-controlled object. The rotating plate is provided on the first motor. The controller is connected to the sensor and the first motor. The sensor is configured to detect a torsional angle of the to-be-controlled object and send the torsional angle to the controller. The controller is configured to process the torsional angle and output a control instruction to the first motor based on a processing result, so as to control the first motor to drive the rotating plate to rotate.

The invention relates to the technical field of gear deformation detection and matched gear design, in particular to a method for large gear ring deformation detection and matched pinion design. The method comprises the following steps: S1, arranging a strain measurement sensor, and detecting the deformation at the tooth root of a gear tooth of a large gear ring by using the strain measurement sensor; s2, calculating the torsion angle of the gear teeth of the large gear ring on the end face according to the deformation amount; the tooth groove width increment of the gear teeth of the large gear ring on the end face is obtained according to the torsion angle; s3, calculating the pressure angle and modulus of the large gear ring after deformation by using the torsion angle of the gear teeth of the large gear ring on the end surface and the tooth space width increment; s4, calculating the pressure angle and modulus of the paired pinion according to the pressure angle and modulus of the deformed large gear ring; the paired pinion is designed based on the pressure angle and modulus of the paired pinion. According to the invention, the deformation of the large gear ring can be detected, and then the paired pinion is designed, so that the engineering design requirements are met.