Create a book download as pdf printable version 5 jun 20 the swash plate oscillation creates an additional displacement of the pump, with the main shaft by means of a pin and slot mechanism. C079, page 1 a study on the variable displacement mechanism of swash plate type compressor for automotive air conditioning system geon ho lee1, tae jin lee2 1 department of refrigeration and air conditioning, doowon. So welcome to this lecture 20 analysis of an axial piston swash plate type. A wide variety of swash plate options are available to you, there are 1,852 suppliers who sells swash plate on, mainly located in asia. It is a mechanical engineering device used to translate the motion of a rotating shaft into reciprocating motion, or vice versa. I assume it has something to do with the flight controls, but im not quite sure what. Combining equations 1, 2 and 3 the net instantaneous torque exerted on the. In particular, the double pump with its tandem arrangement, has eliminated a power divider, has an increased transmission efficiency, and is lighter. The pressure sensor by measuring the pressure dependent qfactor designed in this work is a clampedfree cantilever connected to a perforated plate with large surface area fig. Miloslavich, project engineer abstract several mechanisms have been used to con vert the motion of a rotating shaft to the reciprocating motion needed to drive the pistons of a conventional compressor. Swashplates can be used in a variety of settings, with one of the most famous applications being the helicopter swashplate, which is used by the pilot to adjust the blades of a helicopter in order to achieve lift and control the position of the helicopter. The example below shows how two followers can be used resting on the same swash plate cam. We have developed a new compressor for car air conditioners.
Advantages and disadvantages of piston pump 20100516 17. Swash plate pumps have a rotating cylinder containing pistons. This model illustrates the operation of a swashplate mechanism used in helicopters to translate the input of helicopter flight control into the motion of the rotor blades, and hence controls the orientation of the rotor blades. A swash plate mechanism is used to convert reciprocating motion of the expander pistons to rotary motion. Swash plate definition of swash plate by the free dictionary. The discharge pressure pulsation is mostly dictated by the kinematic relations of the piston slippershoe units fsi1, and is almost isolated from the swash plate vibration. Depending on the magnitude of the clearances slipperswash plate and barrelport plate, the main source of the leakage would be weather one gap or the other. This module enables simulation of an assembly of flexible and rigid bodies, together with. An investigation into the swash plate vibration and.
Earlier investigations of variable axial piston pumps assume a fixed swash plate angle. Fjy force exerted on a single slipper from the slipper holddown mechanism in the. Development of the swash plate type continuously variable. As the engine turns the rotor shaft, it also turns the upper swash plate and the rotor blade system. Helicopter swashplate design and analysis using semi. Depending on the magnitude of the clearances slipper swash plate and barrelport plate, the main source of the leakage would be weather one gap or the other. It has been developed from previous variable displacement compressors, and it encompasses a simple structure. Based on the motion model of the piston and the connecting rod of the engine, the motion tendencies were simulated. Pdf file click here for printable worksheet a swash plate cam is usually a disc that rotates around a shaft. Modeling a helicopter swashplate mechanism comsol blog. A study on the variable displacement mechanism of swash. Pdf dynamic behavior of a variable stroke swash plate mechanism is. New for 2016 homebuilt helicopter swashplate plans ebook download. The swash plate block is a model of a swash plate mechanism used in axialpiston hydraulic pumps and motors to convert translational motion of a piston into rotational motion of a drive shaft.
A piston located at a on the vertical axis is designated as piston no. Swashplate type axial piston pumps for open circuits in. This mechanism enables the swashplate to tilt in all directions and move vertically as. Swash plate in a singlepiston, isothermal axial piston. A swashplate mechanism, used in a helicopter to control the pitch of the rotor blades, can be easily simulated using the multibody dynamics module available in comsol multiphysics.
Jun 04, 2017 if you know how aerofoils work, you know half of the answer. The results suggest the circumferential distance can cause vibration, noise, and rough. The swash plate block models a single, pistonactuated swash plate within an axialpiston pump. Swash, or forewash in geography, is a turbulent layer of water that washes up on the beach after an incoming wave has broken. Pdf performance analysis on a variable capacity swash. The upper swash plate connects to the mast, or rotor shaft, through special linkages. Torque on the cylinder block of an axialpiston swash. The swash plate vibration is strongly influenced by the pressure pulsation through the control actuator mechanism fsi2 and the control valve mechanism fsi3. It was originally invented to replace a crankshaft, and. Since then toyota industries has diversified and expanded the scope of its business domains to include textile machinery, automobiles vehicles, engines, car airconditioning compressors, etc. Us5630707a variable displacement mechanism for swash. Types of compressor and structure oneway swash plate type.
The plate operates a fourarmed pendulum that can be deflected in four spatial directions. If you know how aerofoils work, you know half of the answer. In this paper, simulation of the step response of electro hydromechanically controlled constant power regulated swash plate axial piston pumps with conical cylinder blocks has been carried out. High efficiency and large selfpriming capability the spherical valve plate and improved hydraulic bal. A variable displacement swashplate type compressor suitable for use as a refrigerant compressor of an automotive air conditioner has a cylinder block having a plurality of cylinder bores each slidably receiving a doubleheaded piston, a shaft driven by an automotive engine, a swash plate tiltably mounted on the shaft for rotation therewith to reciprocatorily move the pistons, and a spool for. The swash plate oscillation creates an additional displacement of the pump, especially. The swashplate mechanism is used to transfer rotational motion into dynamic analysis of the swashplate mechanism based on the solution presented.
The disc is set at an angle so that the follower moves up and down as the disc rotates. Meaning, pronunciation, translations and examples log in dictionary. The displacement control system properly changes the tilt angle of the swash plate. Because the main rotor blades are spinning, the swashplate is used to transmit three of the pilots commands from the nonrotating fuselage to the rotating rotor hub and mainblades. This system includes blade grips, which connect the blades to a hub. The jpg to pdf converter is browserbased and functions independently of your os. C079, page 1 a study on the variable displacement mechanism of swash plate type compressor for automotive air conditioning system geon ho lee1, tae jin lee2 1 department of refrigeration and air conditioning, doowon technical college, ansungshi, kyonggido, south korea. In this paper, the mathematic model of the swashplate type variable displacement axial piston pump vdapp is established. One of the most elusive parts of building your own homemeade helicopter is now available to the public. Dynamics of the swash plate mechanism purdue epubs.
A mechanical model of an axial pistontype machine with a socalled wobble plate and zshaft mechanism is presented. Jun 14, 20 modeling a helicopter swashplate mechanism. High efficiency and large selfpriming capability the spherical valve plate and improved hydraulic balance provide stable cylinder rotation, thus achieving. The pistons suck in fluid during half a revolution and push fluid out during the other half. A swashplate or swash plate is a component which can be used to convert circular motion into reciprocating motion, and vice versa. This compressor is a swash plate type compressor with onesided compression, having a continuously variable displacement mechanism. Align 150 dfc how to level the swash plate correctly youtube.
It translates linear actuation into rotational motion that, when connected to the valve plate orifice il block, periodically connects the piston with the pump intake and discharge. As they cut through air, air flows faster on the top side of the rotor blade compared to the air flowing on the bottom side. Swash plate suction valve valve plate technology based on experience first choice for the world take advantage of densos complete ac solution range global status experts in ac for detailed information about compressor oil, warranty and installation, please refer to. Pdf joiner allows you to merge multiple pdf documents and images into a single pdf file, free of charge. Variable displacement swashplate type compressor nippon. The swash plate of the pump is operated with a heavy spring and a piston. Buy your copy today of the homemade helicopter swashplate plans. Combined with the peristaltic propulsion, the aquajellies. It is demonstrated that the main source of the leakage in piston pumps is weather the slipper swash plate or the barrelport plate, producing over 94% of the total leakage. Apr 12, 2020 a swashplate or swash plate is a component which can be used to convert circular motion into reciprocating motion, and vice versa.
Dynamic modelling of the swash plate of a hydraulic axial piston. Swash plate oscillation in a variable displacement. A spring pushes the pistons against a stationary swash plate, which sits at an angle to the cylinder. Torque ripple attenuation for an axil piston swash plate. Due to many advantages, swash plate pumps are wide spread in hydraulic systems. This is in ebook format, not pdf and not printable. Chapter 3 installation of swash on your computer the portability of the swash code between di. Swash plate pump definition and meaning collins english. F force exerted on the nth slipper from the swash plate in the direction normal to the. The vdapp applied to an electrohydraulic servo control system usually induces unstable performance, so that a servo controller is designed and analyzed to control the swashplate angular displacement and improve the stability and transient response of pump performance. Pdf dynamic behavior of variable stroke swash plate mechanism. A complete analysis of axial piston pump leakage and. Emitted noise is one of the biggest drawbacks of using. A swashplate also known as slant disk was invented by anthony george maldon michell in 1917.
In this video we have explained all the components of the pump and how each components contribute to its working, you can see how the flow can be varied using the swash plates and how the pistons. Manring, noah denver, torque on the cylinder block of an axialpiston swashplate type hydrostatic pump 1996. Mar 16, 2016 the swash plate vibration is strongly influenced by the pressure pulsation through the control actuator mechanism fsi2 and the control valve mechanism fsi3. Swash plate oscillation in a variable displacement floating cup pump. The overall aim is to design and construct an oilfree piston expander demonstrator as a first step to realizing an advanced and compact smallscale steam engine system. In order to conduct a comprehensive analysis and optimization improvements of the swashplate engine, it is necessary to analyze and discuss the motion of the swashplate completely. It is seen that design optimization method combining integrated cosimulation and. S is the plane of the swash plate, and s is the vertical plane.
When highpressure oil supplied from the pump flows into the cylinder block through the valve plate, the swash plate is pushed by the force of the piston assembly. The swashplate of a model helicopter consists of stationary and rotating plates separated by ball bearings. Having the seismic plate perforated provide us decreased squeeze film gas damping as well. Manring, noah denver, torque on the cylinder block of an axialpiston swash plate type hydrostatic pump 1996.
A distributemerge switch for ethercat networks request pdf. A variable displacement mechanism for a swash plate hydraulic pump or motor, in which a swash plate, a swash plate guiding wall, a tilting control piston, and a swash plate tilting guiding and swash plate rotation preventing pin are included for varying the requiring flow rate volumetric displacement per revolution without the rotation of the swash plate even during the tilting of the swash. Noise considerations presented by viral mehta a candidate for the degree of doctor of philosophy and hereby certify that in their opinion it is worthy of acceptance. It is demonstrated that the main source of the leakage in piston pumps is weather the slipperswash plate or the barrelport plate, producing over 94% of the total leakage. A swashplate is a device that translates input via the helicopter flight controls into motion of the main rotor blades. The swash action can move beach materials up and down the beach, which results in the crossshore sediment exchange. Toyota industries corporation was founded in 1926 by sakichi toyoda to manufacture and sell the automatic looms which he had invented.
Now that we know that the best way to check the correct neutral swashplate position is the workline pressure comparison, let us look closely into typical closedloop controls and servomechanism designs, and the best ways to null them the most common type of closedloop pump control is proportional displacement control hydraulic or electric. This work deals in particular with variable displacement swashplate. Pdf displacement control in variable displacement axial piston. Advantages and disadvantages of piston pump industrial. Pressure compensation reduced flow after reaching set pressure. The working principles is similar to crankshaft, scotch yoke, or wobblenutatorzcrank drives, in engine designs.
When the pendulum tilts in a particular direction, the jellyfishs centre of gravity is displaced accordingly and it then swims in this direction. The cyclic pitch of the rotor blades is used to change a helicopters roll and pitch. The basics of variable displacement pump controls crossco. In a variable displacement pump, we vary the angle of the rotating group, which is done by tilting the swash plate.
Swash plate oscillation in a variable displacement floating cup pump p. What is the function of the scissors link on the rotor of a helicopter. Swash plate oscillations due to piston forces in variable. The top countries of suppliers are south korea, china, from which the percentage of swash plate supply is 1%, 98% respectively. Closed loop hydrostatic transmissions null adjustment. Nov 15, 2017 in this video we have explained all the components of the pump and how each components contribute to its working, you can see how the flow can be varied using the swash plates and how the pistons. Helicopter swashplate mechanism comsol multiphysics. Multidisciplinary design optimization of a swashplate axial. A refrigeration capacity of 8 watts was achieved at 4. Swash plate piston pump axial flow variable displacement. Shown on edge on the far right in the animation is a dark stationary disk. Pdf modeling of swash plate axial piston pumps with. Homebuilt helicopter swashplate plans build a helicopter.
This study investigates the oscillations of swash plates caused by piston forces acting on the swash plate. Dynamic highfrequency behaviour of the swash plate in. What is the function of the scissors link in helicopter. The swashplate angle control of a variable displacement. The mechanism is a combination of a cylinder block or rotor, with the piston fitted inside, and an angled swash plate. Basic construction motor unit traveling motor with reduction gear swing motor with reduction gear construction and mechanism 1. The swash plate assembly consists of two parts the upper and lower swash plates. A swash plate type compressor composed of a pair of cylinder blocks having pistons and a swash plate mounted therein is assembled in such a manner that projections extending partially from the cylinder blocks are brought into abutting relationship. A swashplate mechanism controls the cyclic and collective pitch of the rotor blades.
A swash plate drive mechanism for an axial piston machine is disclosed comprising a pair of yokes with intersecting longitudinal axes and intersecting crossaxes and a swash plate drivingly connected with the pistons and pivotally connected between the yokes for pivotal movement about their crossaxes whereby the swash plate is caused to oscillate and effect double frequency drive between the. The timescale of swash motion varies from seconds to minutes depending on the type of beach see figure 1 for beach types. Pressure compensated control is the most basic control for a variable stroke piston pump. Movement of the swash plate in variable inline pumps at decreased displacement setting angle liselott ericson fluid and mechatronic systems, linkoping university, 581 83 linkoping liselott.
1422 555 869 782 1424 542 51 1307 873 1292 1032 898 618 1055 1000 877 213 537 651 267 172 537 1162 542 1604 974 1613 1286 800 1016 13 667 1129 690 1374 715 487 1140 268 778 956 550 1305