Academic literature on the topic 'Hydrostatic travel drive'

In recent years, the enterprises of forestry and the Ministry of Energy of the Republic of Belarus and other countries widely implemented advanced milling tools designed to chop wood, stumps and roots without immersing the cutter in the soil (mulchers) and with immersion (rotovators), which allows you to prepare the ground for planting forest crops. They can be mounted on multi-purpose tractors, loaders and excavators. At the same time, there are no methods that allow carrying out a reasonable choice of technological equipment for a particular basic machine, since a significant number of production, technological and technical factors have an impact on the emerging power and capacity parameters. The proposed method allows taking into account a significant number of variable values (working methods, speeds of various operations, parameters of the working body, its drive and base chassis, soil conditions, etc.) and simulate the interaction of milling tools under various operating conditions. It was found that the greatest loads on the mulcher rotor occur during the felling of tree and shrub vegetation, which is associated with an increase in the area of interaction between the cutters and the wood up to 2 times compared with the chopping of similar lying stands. This value can be reduced by 15–30 % depending on the diameter of the trunks being processed. In the case of a significant amount (cluster) of forest stands with a diameter of more than 10 cm, it is preferable to carry out work at a speed of about 0.2 m/s or advanced felling of these trees. The use of hydraulic travel (speed) reducers or hydrostatic transmission is promising in order to reduce dynamic loads and get better adaptability of the working equipment to natural-production conditions (the ability to work at a speed from 0 to 5 km/h). It should be noted that the installed required engine power for the milling equipment drive should be increased by 10–15 % due to the needs of the drive of various equipment located on the base chassis. Also, in the case of the integrated use of tree and shrub vegetation, it is possible to use mulchers that collect biomass; however, this will require additional energy costs. In this regard, the method can be applied when choosing the parameters of technological equipment for the existing base chassis, to solve the inverse problem, and also to select the operating mode of the milling equipment depending on the natural and production conditions with the possibility of subsequent prediction of the effectiveness of the work performed.

I have been the chairman of the technical committee of ultraprecision positioning at the Japan Society of Precision Engineers (JSPE) from 1993 to 1997. In November 2008, the 3rd International Conference on Positioning Technology (ICPT) was held in Shizuoka, Japan. After the conference I together with Dr. Sadaji Hayama, an adviser of the journal editorial board, asked by mail the most significant presenters and members of the technical committee of ultraprecision positioning if they are willing to contribute their papers for this special issue. As a result, we received more than 20 manuscripts, among which 2 development reports, 2 reviews, and 14 papers have been selected for publication in this journal. The contents of these papers relate mainly to the nano/subnanometer positioning technology, new control methods for ultraprecision positioning, guide way for precision positioning, positioning for ultraprecision machining, new hard disk drive method, etc. I would like to express my sincere gratitude to the authors for their interesting papers on this issue and I also would like to deeply thank all the reviewers and editors for their invaluable effort.1. Demarcation Between Precision Positioning and Ultraprecision Positioning The Technical Committee of Ultraprecision Positioning (TCUP) has had a poll on Ultraprecision and Ultraprecision technology to the randomly selected members of Japan Society for Precision Engineers (JSPE) every four years since 1986 [1]. Results indicate that most respondents felt that the maximum allowable positioning error and image resolution was 1 µm for precision positioning and 10 nm for ultraprecision positioning. After 2004, most respondents appeared to view 0.1 nm as the demarcation line between the precision positioning and ultraprecision positioning.2. Know-How for Achieving Ultraprecision Positioning The champion device in ultraprecision positioning is always the stages of demagnification exposure devices for semiconductors. The exposure method using stages have advanced from 1980s steppers shown in Fig. 1(a) to today's scanning stages with the increasement of LSI capacity in achieving higher processing as shown in Fig. 1(b). The stepper consists of X and Y stages.The XY stages in the 1980s consisted of a DC servomotor, either a ball or sliding screw plus a linear guide way consisting of either rollers or a slide guide. Current scanning type consists of a linear motor and pneumatic hydrostatic guide way (Fig. 1(b)). Reticle and wafer stages travel in opposite directions and the relative positioning error is about 1 nm.Ultraprecision positioning of sub-µm accuracy is now achieved either by an AC servomotor and a ball screw or by using a linear motor. subsection2.1. Achieving high positioning resolution and accuracy with less than 0.1 µm generally depends on three factors: newpage(1) Displacement sensors for feed-back(2) Mechanical structure(3) Control, including software Ultraprecision positioning is possible only when these three factors are well coordinated.(1) Displacement Sensors Ultra-precision positioning requires high-performance displacement sensors. About 10 sensor manufacturers in Japan alone currently achieve resolution under 1 nm [3]. To achieve higher resolution, laser interferometers must operate in thermostatic chambers controlling or monitoring temperature, humidity, and atmospheric pressure. Great effort is required to minimize or eliminate air turbulence and inhomogeneous atmosphere temperatures in the laser beam path. To achieve nm level resolution, operations must be conducted in a vacuum.Linear encoders, although somewhat less accurate than laser interferometers, are used in over 50% for ultraprecision positioning devices in Japan and their market share continues to grow, according to the 2006 TCUP poll. Analog sensor performance in detecting microscopic displacement is steadily improved. The technical level of precision positioning device is often assessed by how the designer considers Abbe's principle.(2) Mechanical Structure Overall structural rigidity should be maximized to ensure monolithic construction. Semiconductor aligners used in exposure are made from ceramics with a high specific rigidity, i.e., the quotient of Young's modulus divided by specific gravity.1990s arguments pitting linear actuators against ball screws subsided as their specific advantages and domains of preferred use became established. Linear guide ways using steel balls or rollers are becoming cheaper, and their accuracy and other aspects of performance are improving.When stage movement is reversed, friction generated by preloads as nonlinear spring behavior which is caused by elastic deformation of balls and race ways over the moving stroke of several tens of µm, stage vibration is easy to generate. Another disadvantage, called waving, occurs when the table moves up and down at the sub-µm level perpendicular to the stage travel direction at twice the spacing of the roller separation. It is found out that waving is minimized by crowning roller guide race way. Error due to waving is reduced to less than one tenth of the original error margin [4]. Nonlinear spring behavior is minimized by modifying control method of the positioning device. For longitudinal travel, pneumatic-hydrostatic devices virtually unaffected by friction are an alternative but are prohibitively expensive.(3) Control, Including Software In precision positioning, control devices and systems have advanced significantly in the last two decades [5], changing from analog to digital with higher sampling frequency. Current digital control enables devices to be operated in conceptually the same way as analog control. TCUP respondents [1] stated that 70% of positioning devices in Japan still depend on conventional control, PID control, with innovative contemporary control theory, fuzzy control, and neural nets, etc. yet to be fully implemented.2.2. Higher Positioning Speed Higher positioning speed is required, as well as higher positioning accuracy. In scanning Fig. 1(b), maximum stage speed exceeds 2 m/s second and maximum acceleration ranges from 3G to 5G. The corresponding speed and acceleration of the wafer stage is one fourth of these values. At such high acceleration, reaction dampers are used to prevent vibration [2].About ten years ago, the maximum velocities of positioning stages tended to be limited by the speed of the displacement sensor for feed-back, however at present, it is possible to operate at the range of speed mentioned above. Note that the velocity exceeding 2 m/s is possible even with ball-screw, but noise and microvibration remain a problem.3. Nanometer and Subnanometer Positioning [3, 5-7, 10] We are pursuing the convergence of the positioning resolution to the fullest extent of the resolution of the displacement sensor for the feed-back. Bulletins [3, 6] have carried reports on experiments attaining resolution for positioning with maximum error below 0.1 nm. We introduce cases of positioning device development at nm and sub-nm resolution using both ball screw [7] and linear motor drives [8]. I would like to introduce a commercialized ball screw drive production of 1 nm resolution [7].3.1. Combination of Ball-Screw and Stepping Motors [7] The positioning devices have the resolution respectively at 1 nm and 5 nm (the lengths of travelling strokes for the stage are 20 m and 50 mm respectively). Both compensate for the rolling frictions between the ball screw and the roller guide way and for the nonlinear spring behavior at the micro-displacement range through the control of the stepping motors at high, medium and low ranges of speeds. As the dimension of detector of the displacement sensor is very small, we can make the positioning devices smaller. So, it is very strong to external disturbances.3.2. New type of Linear Motor Drive [8] The latest new type of linear actuators, generally referred to as tunnel actuators (TAs) used in ultraprecision positioning devices with a stage stroke of 200 nm (Fig. 2) are free from magnetic attractive force between stator magnets and armatures, generating less heat and having other advantages over conventional linear motors with cores.In experiments using a displacement sensor to adjust feed-back with 0.034 nm resolution and a maximum velocity of 400 mm/s, we use ball guide ways to reduce cost and still achieved a positioning resolution of 0.2 nm (Fig. 3) [8]. Experiments confirmed that, to achieve more higher resolution, electric current linear amplifiers are 10 times more effective than PWM as the current amplifier.4. Conclusions We have discussed how nanometer- and sub-nm level positioning resolution and accuracy became possible, greatly contributing to advances in nanotechnology. Nanometer and subnanometer positioning resolution are currently verified by signals from displacement sensors for feed-back. Considering changes in the positioning of stages, however, such positioning and resolution should be verified by using displacement sensors which are more accurate.If possible, verification on the resolution and accuracy must be done using a laser interferometer in a vacuum in a temperature-controlled chamber. We feel that positioning resolution should be indicated by signals directly received from sensors without low pass filter.

The object of this master’s thesis is design of a suitable hydrostatic travel drive for harvester. The first part dedicates of constructions of harvesters and actual different conceptions of travel drive. Next, there are design of hydrostatic circuit, calculation of general hydraulic parameters and design of hydraulic components in the second part. The last part deals with issue of combustion engine and cooler.

A deep submergence vehicle operated by the Woods Hole Oceanographic Institution (WHOI), Alvin has made more than 4,200 deep-ocean dives since 1964. Lockheed Martin Corp. was contracted in 2007 by WHOI with funding provided by the National Science Foundation to design a Replacement Human Occupied Vehicle (RHOV) which would take advantage of recent technological advances to provide expanded depth capability. This paper discusses the criteria, evaluation, and selection of the method of descent and ascent, a high-level naval architecture trade which drives the general arrangement of the entire vehicle. Constrained by vehicle performance requirements, exploration of the system design parameters through dynamic simulation and CFD modeling allows for design optimization. Considering the transient features of ascent and descent such as dynamic ballast pumping and variation in fluid and vehicle density driven by hydrostatic pressure, the preferred method of vertical travel for the RHOV is a level vehicle at zero angle of pitch with velocity orthogonal to the free surface.

To increase productivity of a wind power plant, the overall loss of its drivetrain should be minimized. For hydrostatic transmission wind turbine (HTSWT), aerodynamic efficiency of the rotor and the hydrostatic efficiency of pump and motor determine the overall loss. In this study, optimal control theory is utilized to develop a control law that minimizes the overall loss. A nonlinear model is considered for the drivetrain and a performance index (PI) is defined for the overall loss subject to system constraints which were then used to derive the optimal control law based on Pontryagin Minimum Principle (PMP),. Simulation results verified that the controller was able to maximize the drive-train efficiency. At very low wind speed, a trade-off is observed between aerodynamic and hydrostatic efficiency. For higher wind speed where the hydrostatic efficiency asymptotically reaches its maximum efficiency maximum output power coincided with maximum power point tracking of input wind power.

An anisotropic ductile damage description is motivated from fracture mechanisms and physical observations in Al-Si-Mg aluminum alloys with second phases. Ductile damage is induced by the classical process of nucleation of voids at inclusions, followed by their growth and coalescence. These mechanisms are related to different microstructural and length scale parameters like the fracture toughness, the void size, the intervoid ligament distance, etc. The classical thermodynamic constraints of irreversible processes with material state variables are used to model the tensorial damage evolution coupled to the Bammann-Chiesa-Johnson (BCJ) rate-dependent plasticity. The damage-plasticity coupling is based on the effective stress concept, assuming the total energy equivalence, and written through a deviatoric damage effect tensor on the deviatoric part and through the trace of the second rank damage tensor on the hydrostatic part. The damage rate tensor is additively decomposed into a nucleation rate tensor, a void growth rate scalar, and a coalescence rate tensor. The induced damage anisotropy is mainly driven by the nucleation, which evolves as a function of the absolute value of the plastic strain rate tensor. Finally, some experimental data of cast A356 aluminum alloy are correlated with predictive void-crack evolution to illustrate the applicability of the anisotropic damage model.