Dissertations / Theses on the topic 'Design of mower'

In this diploma thesis is documented an analysis and an approach of designing a self-propelled mobile reel mower with respect of general assumptions of industrial design. Thesis takes aim on a comparison of technologies of present manufacturers of garden equipment and proper choice and following application of technical solution and shape solution on a new product.

This thesis deals with the analysis and design OF self-propelled mower on the grass. The machine is designed for cutting fodder, and their subsequent treatment. Focusing on the vast scope and great hourly output. The design emphasis is on compliance ergonomic rules, easy maintenance and functionality of the machine. For a very innovative features can be seen ejecting the cab, crop spacing on the sides, drive hydraulic cutter bars. In particular, the location of the cabin and boarding colors and folding machine cutter bars during transport. The machine was created to perfect performance, operator comfort, performance focused on large cysts and fluid design.

Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2014.
Cataloged from PDF version of thesis.
Includes bibliographical references (page 14).
The flail mower is a piece of agricultural equipment that uses bladed attachments rotating around a drum to cut down bushes and grassy terrain. One major drawback to the flail mower is the rapid wear that happens almost immediately when any sort of rocks, gravel, or rough terrain are encountered. The goal of this project was to design and manufacture a prototype of a machine that could level rough terrain through repeating impacts as opposed to cutting with blades. The final design was a chain flail mower, a piece of equipment designed to level rough terrain that uses chains to repeatedly bludgeon rocks, gravel, and debris. The designed chain flail mower was assembled into an existing commercially available snow blower for testing.
by Aaron Flores.
S.B.

The work deals with comprehensive design concept of a remote controlled slope mower in direct relation to the proposed technological solution. Product has been designed in order to take (capture) its place in the current, young market of commercialy used slope mowers. Main goal of this work is to create an advanced shape solution with high-end technical specifications, based on a suitable undercarriage concept.

Thesis (Master of Engineering)--Case Western Reserve University, 2010
Department of EMC - Mechanical Engineering Title from PDF (viewed on 2010-05-25) Includes abstract Includes bibliographical references and appendices Available online via the OhioLINK ETD Center

Thesis (M.S. in Engineering Acoustics) Naval Postgraduate School, June 1995.
Thesis advisor(s): Anthony A. Atchley, Thomas J. Hofler. "June 1995." Includes bibliographical references. Also available online.

This paper is about the central role of product design on consumer evaluations. While the design literature has articulated two different types of design, i.e. form-based design and function-based design (Khalid 2004), most extant marketing literature has mostly focused on the impact of functional design on performance (see Chitturi, Raghunathan, and Mahajan (2007) for a notable exception). In this paper, I examine the individual and joint effects of the two design dimensions: form design and functional design on consumer evaluations of new products. In the first essay, employing theoretical underpinnings from processing fluency theory, I investigate four major research questions. First, all else equal, does form design matter? Second, how does form design interact with functional design? Third, does the interaction between form and functionality change in an innovation context? Specifically, given a certain level of functionality, what type of form is more advantageous for a radically new product (RNP) or an incrementally new product (INP)? Fourth, is there an individual difference in consumer evaluations to innovative products with various form designs? Results from the four experiments conducted demonstrate that (1) more typical form design leads to more positive attitudes toward the product than less typical form design, (2) a more typical design compensates for the average functionality of the product and hence a product with average functionality is evaluated as well as highly functional products in the more typical design condition. In a less typical design condition, a product with high functionality leads to much lower consumer attitudes towards the product, (3) whereas the form design for incremental innovations must be closer to the incumbent products for favorable evaluations, less typical form is evaluated as good as more typical form for radical innovations. (4) Form design of an innovative product matters more to the technologically more sophisticated consumers (experts) than technologically less sophisticated consumers (novices). In the second essay, I examine the issues involved in using form design to nullify first mover advantage. Pioneers or first movers can be defined as the first firm to sell in a new product category. Despite the proliferation of the pioneering advantage research, there are few empirical studies which examined how the product design enables the later entrants to nullify the first mover advantage. Employing theoretical underpinnings from categorization theory, I investigate the following research questions. First, what type of form is more likely to enhance consumer evaluations and nullify first mover advantage when the follower s product is featured with higher or lower functionality? Second, how does form design interact with functional design for the follower s product? Results from the experimental study conducted demonstrate that (1) if the follower s functionality is not superior to the pioneer s, follower had better focus on design differentiation which can compensate for the lower functionality of the follower (2) if the follower s functionality is superior to the pioneer s, follower had better follow the pioneer s design for the better product evaluation. The managerial implication is clear: Form design is a critical determinant of consumer evaluations. Form design helps create and appropriate value for firms.
Ph.D.
Department of Marketing
Business Administration
Business Administration PhD

Thesis (Ph. D.)--West Virginia University, 1999.
Title from document title page. Document formatted into pages; contains xi, 238 p. : ill. (some col.) Includes abstract. Includes bibliographical references (p. 231-238).

Construction machines, also referred to as engineering vehicles or earth movers, are used in a variety of tasks related to infrastructure development and material handling. While modern construction machines represent a high level of sophistication in several areas, their suspension systems are generally rudimentary or even nonexistent. This leads to unacceptably high vibration levels for the operator, particularly when considering front loaders and dump trucks, which regularly traverse longer distances at reasonably high velocities. To meet future demands on operator comfort and high speed capacity, more refined wheel suspensions will have to be developed. The aim of this thesis is therefore to investigate which factors need to be considered in the fundamental design of suspension systems for wheeled construction machines. The ride dynamics of wheeled construction machines are affected by a number of particular properties specific to this type of vehicle. The pitch inertia is typically high in relation to the mass and wheelbase, which leads to pronounced pitching. The axle loads differ considerably between the loaded and the unloaded condition, necessitating ride height control, and hence the suspension properties may be altered as the vehicle is loaded. Furthermore, the low vertical stiffness of off-road tyres means that changes in the tyre properties will have a large impact on the dynamics of the suspended mass. The impact of these factors has been investigated using analytical models and parameters for a typical wheel loader. Multibody dynamic simulations have also been used to study the effects of suspended axles on the vehicle ride vibrations in more detail. The simulation model has also been compared to measurements performed on a prototype wheel loader with suspended axles. For reasons of manoeuvrability and robustness, many construction machines use articulated frame steering. The dynamic behaviour of articulated vehicles has therefore been examined here, focusing on lateral instabilities in the form of “snaking” and “folding”. A multibody dynamics model has been used to investigate how suspended axles influence the snaking stability of an articulated wheel loader. A remote-controlled, articulated test vehicle in model-scale has also been developed to enable safe and inexpensive practical experiments. The test vehicle is used to study the influence of several vehicle parameters on snaking stability, including suspension, drive configuration and mass distribution. Comparisons are also made with predictions using a simplified linear model. Off-road tyres represent a further complication of construction machine dynamics, since the tyres’ behaviour is typically highly nonlinear and difficult to evaluate in testing due to the size of the tyres. A rolling test rig for large tyres has here been evaluated, showing that the test rig is capable of producing useful data for validating tyre simulation models of varying complexity. The theoretical and experimental studies presented in this thesis contribute to the deeper understanding of a number of aspects of the dynamic behaviour of construction machines. This work therefore provides a basis for the continued development of wheel suspensions for such vehicles.
QC 20110531

Thesis (M.S.)--University of Wisconsin--Madison, 1996.
Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaf 69).

碩士
國立臺灣大學
生物產業機電工程學研究所
107
This study is dedicated to establish an intelligent lawn mower. Based on a remote control car body and calculate the motion state of the mower body based on the characteristics of Ackermann steering system. The corresponding mower body speed and angular velocity relationship are implemented and maintained by the Robot Operating System (ROS). The Hall sensor is used to test the tire’s rotation speed to perform linear speed sensing. The measured speed from Hall sensor and the actual measured average speed deviation are 0.7 m/s, and sensor fusion is implemented by Kalman Filter, so as to achieve more accurate mower state tracking, since the steering is only using the IMU for sensing, error gradually increase overtime, so it is necessary to additionally locate the position of the mower through environmental information. Through the depth information of the Intel D435 depth camera, as the main sensor of the intelligent mower''s environmental information, with the mower state estimated by Kalman Filter, using the Particle Filter algorithm to locate the mower position, confirm the mower After state tracking and positioning, the overall environment can be mapped with environmental information to achieve Simultaneous Localization And Mapping (SLAM). In this study, the path planning is divided into global and local path planning, implement by the combination of the shortest path algorithm (A* search) and DWA (Dynamic window approach). Achieve the basic positional movement effect、remote control and analog monitoring functions. In the field of region filling, tests how to completely fill an irregular shape map through simulation. In addition to the above software implementation, this study also includes how to gradually build a remote control car into a self-driving vehicle with a mowing mechanism, and design a mowing mechanism’s prototype, and test the mowing with a current sensor. The current feedback tracking of the drive motor is used to monitor the mowing situation.

Indiana University-Purdue University Indianapolis (IUPUI)
With the development of the electric mower, an electrical control system is necessary to drive the blades and the traction wheel. This thesis introduces an electrical deck control system. The system includes a high-powered deck controller and a permanent magnet synchronous motor (PMSM). A PMSM control model has been built in MATLAB/Simulink to verify and support the physical design. Three different PWM modulation methods have also been implemented and compared in MATLAB/Simulink. Furthermore, a model for the distribution and features of grass was built based on sampling of Google Street View images. A six-step pulse width modulation (PWM) control strategy was realized using a PIC33 embedded microprocessor. An enhanced closed-loop control system design was implemented to keep a constant blade speed in order to cut grass efficiently.

碩士
國立雲林科技大學
資訊工程系
107
At present, automatic sweeping robots are very common in the market, but automatic mowing robots are not so common. The automation of lawn mowers can eliminate many boring manual work and save labor. The focus of this article is to develop a fully automatic mowing robot. The mowing robot can be set to automatically cut off weeds in the designated area, or it can be manually controlled by wifi using a mobile phone, allowing the user to remotely control the mowing robot. We first bought a mower to modify it and completed the manual control. After that, we assembled a small robot car to simulate the automation part for the convenience of testing. The automated part uses the RTK method to get the precise GPS coordinates of the current car and the next target, and then combines the gyro sensor plus the PID to complete the straight line to reduce the overlap ratio during walking.

碩士
國立中興大學
電機工程學系所
96
An optimal path planning scheme for autonomous lawnmowers to achieve minimum working time, minimum energy conservation and mixed operation mode, as well as high efficiency is developed in this thesis. For route planning, rough path planning and a geography method are adopted. A rough path planning is first considered with obstacles ignored. Then, a geography method is applied to enable the details of a real optimal path in accessing the easiest and safest condition. After taking the chosen mode, a distinct path planed on the basis of the obstacles coordinates are obtained. Additionally, a global positioning system (GPS) which provides real-time positioning of the lawnmower is equipped with the path planning system. In addition to the path planning using single mower, an algorithm for multi-task operation as well as the partitioning method for working area is also developed. For this algorithm, we define an index of mowing easiness, with which the accomplishing level in mowing for any prairies can be derived. Based on the figure of mowing easiness, an objective function is proposed for optimization. With the optimization of this objective function, the control law for the optimal multi-task of mowing is developed. The optimal path planning has been tested under a variety of simulations and proven to be effective in enhancing the working efficiency.

碩士
吳鳳科技大學
光機電暨材料研究所
104
This research is focused on the helical blades used in the reel mower machine which uses 5 to 10 helical blades. These blades are normally manufactured using the roll forming process which has certain demerits. This research is done to develop a new process known as Compression process for the manufacture of blades using inverse engineering. To save cost of research, time as well as waste of material the computerized simulation process is being used. The design of the blade as well as the die for the compression and modification are done using software Solidworks. Simulation is performed using software Deform 3D. The simulation result and the actual design are compared using software GEOMAGIC. This study also shows the potential applications of inverse engineering and its benefits in verifying and reinventing the part manufacturing process.

碩士
大葉大學
工業工程與科技管理學系碩士在職專班
97
Speech recognition system to identify whether the kind of language, the use of the basic methods are more or less the same,the main difference is that the characteristics of various languages to Chinese characters, the pronunciation of Chinese characters by the sound of vowels and tones of the composition,therefore,need to recognize when together with the tone of the judge. The previous study of speech recognition systems only theoretical research-oriented,rapid growth until the computer and with each passing day,the voice recognition function gradually eat into the actual product application.Currently used in general speech recognition system are: remote control toys,input method,query systems,locks and so on,gradually has been widely used in a variety of purposes. Currently the industry common use and more precise fixed position system motor （step motor,servo motor）all did not adopt the speedch recognition function.This thesis research draws up to have the speech recognition function,combining the grey theories of gray relational analysis,applying in tread unto the motor to position the system. This thesis structure is divided into two parts：one is handling for the speech recognition,and using the grey theories of gray relational analysis.Another is to sieve the right order to lose to the controller of PLC to make to tread into the motor to control.

碩士
國立聯合大學
電機工程學系碩士班
103
High speed motor is often adopted in the air conditioner and machine tool to achieve energy saving and high speed manufacture. The objective of this research is to develop the drive technology for induction motor (IM) with high speed. Vector control (VC) is essential for a precise speed and torque control of the IM. This research employs an indirect VC that estimates the rotor speed and slip to achieve a speed sensorless control. Precise rotor speed estimation relies on precise machine parameter estimation. This research presents an auto tunning method that uses DC test, lock-rotor test and no load test to estimate the equivalent circuit parameters of the IM. Accordingly, the sensorless speed estimation and indirect VC are designed. A sliding mode back EMF estimation method is adopted to reduce the speed error due to parameter variation caused by the inevitable temperature rise. To make a smooth full range speed control, a dynamic filter is developed to adjust the cut-off frequency of the low-pass filter to obtain a low ripple speed feedback. A fully digital controller is realized using the TI F28335 DSP IC. The firmware is programmed with the auxiliary design of the PSIM SimCoder digital control developing platform. A 2kW IM drive is implemented. The effectiveness of the proposed method is confirmed with some simulation and experimental results.

碩士
國立臺灣大學
財務金融學研究所
102
This thesis establishes a theoretical model to investigate welfare issues related to reverse mergers, which are a type of mergers used by private firms to become publicly traded without resorting to the initial public offering (IPO) process. It proposes that reverse mergers provide a way for private firms to get listed rapidly and gain first-mover advantages in the product markets, but the managers of poor-quality firms may use reverse mergers to get listed and exploit uninformed investors through insider trading. This thesis finds that moving the reverse merger stocks to a stock market with lower market liquidity may be the best choice in terms of social welfare. This arrangement effectively limits the insider trading gains of the poor-quality firms’ managers, thus depresses their incentive to undertake reverse mergers. At the same time, it still allows firms that have good market opportunities but cannot satisfy the IPO standard to get listed through reverse mergers.

碩士
國立中山大學
電機工程學系研究所
95
The objective of this thesis is to establish an electromagnetic energy conversion mechanism that is suitable for electric power generation from solar thermal energy. Based on the generator design and thorough electromagnetic path design, a tubular linear generator system design will be proposed. The stator armature with three-phase concentrated windings mounted on a slotless structure is targeted to be implemented for this structure of the generator design, and a special designed of two-segmental Halbach permanent magnet array will be installed on the mover to fulfill the desired tubular linear generator construction. From detailed magnetic equivalent circuit (MEC) analysis and three-dimensional finite element analyses, the feasibility and applicability of the proposed machine system concepts will be verified. Finally, the steady-state operational characteristic of this generator have been estimated cinfirm the design objectives.