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Author: Samuel Kärnell Publisher: Linköping University Electronic Press ISBN: 9179298303 Category : Languages : en Pages : 72
Book Description
More and more vehicles are being electrified. Mobile working machines and heavy trucks are not excluded, and these machines are often hydraulically intense. Electrification entails new requirements for the hydraulic system and its components, and these requirements must be taken into consideration. Hydraulic systems have looked similar for a long time, but now there is an opportunity to advance. Many things change when a diesel engine is replaced with an electric motor. For example, variable-speed control becomes more relevant, electric regeneration becomes possible, and the use of multiple prime movers becomes an attractive alternative. The noise from the hydraulic system will also be more noticeable when the diesel engine is gone. Furthermore, the introduction of batteries to the system makes the energy more valuable, since batteries are heavy and costly compared to a diesel tank. Therefore, it is commercially viable to invest in the hydraulic system. This thesis revolves around the heart of the hydraulic system, that also is the root of all evil. That is the pump. Traditionally, a pump has had either a fixed displacement or a continuously variable displacement. Here, the focus is on something in between, namely a pump with discrete displacement. The idea of discrete displacement is far from unique, but has not been investigated in detail in combination with variable speed before. In this thesis, a novel design for a quiet pump with discrete displacement is presented and analysed. The results show that discrete displacement is relevant from an energy perspective for machines working extensively at high pressure levels and with low flow rates, and that a few discrete values are enough to make a significant difference. However, for other cycles, the possible energy gains are very limited, but the discrete displacement can be a valuable feature if downsizing the electric machine is of interest.
Author: Samuel Kärnell Publisher: Linköping University Electronic Press ISBN: 9179298303 Category : Languages : en Pages : 72
Book Description
More and more vehicles are being electrified. Mobile working machines and heavy trucks are not excluded, and these machines are often hydraulically intense. Electrification entails new requirements for the hydraulic system and its components, and these requirements must be taken into consideration. Hydraulic systems have looked similar for a long time, but now there is an opportunity to advance. Many things change when a diesel engine is replaced with an electric motor. For example, variable-speed control becomes more relevant, electric regeneration becomes possible, and the use of multiple prime movers becomes an attractive alternative. The noise from the hydraulic system will also be more noticeable when the diesel engine is gone. Furthermore, the introduction of batteries to the system makes the energy more valuable, since batteries are heavy and costly compared to a diesel tank. Therefore, it is commercially viable to invest in the hydraulic system. This thesis revolves around the heart of the hydraulic system, that also is the root of all evil. That is the pump. Traditionally, a pump has had either a fixed displacement or a continuously variable displacement. Here, the focus is on something in between, namely a pump with discrete displacement. The idea of discrete displacement is far from unique, but has not been investigated in detail in combination with variable speed before. In this thesis, a novel design for a quiet pump with discrete displacement is presented and analysed. The results show that discrete displacement is relevant from an energy perspective for machines working extensively at high pressure levels and with low flow rates, and that a few discrete values are enough to make a significant difference. However, for other cycles, the possible energy gains are very limited, but the discrete displacement can be a valuable feature if downsizing the electric machine is of interest.
Author: Editorial Datagroup Publisher: ISBN: 9781086582666 Category : Languages : en Pages : 184
Book Description
The Fluid Power Pumps & Motors World Summary Paperback Edition provides 7 years of Historic & Current data on the market in about 100 countries. The Aggregated market comprises of the 19 Products / Services listed. The Products / Services covered (Fluid power pumps & motors) are classified by the 5-Digit NAICS Product Codes and each Product and Services is then further defined by each 6 to 10-Digit NAICS Product Codes. In addition full Financial Data (188 items: Historic & Current Balance Sheet, Financial Margins and Ratios) Data is provided for about 100 countries. Total Market Values are given for 19 Products/Services covered, including: FLUID POWER PUMPS + MOTORS 1. Fluid power pump & motor manufactures 2. Nonaerospace type reciprocating fluid power pumps 3. Nonaerospace type rotary & other fluid power pumps 4. Nonaerospace type fluid power motors 5. Aerospace type fluid power pumps & motors 6. Parts for fluid power pumps, motors & hydrostatic transmissions 7. Fluid power pumps & motors, nsk, total 8. Fluid power pumps & motors, nsk, nonadministrative-record 9. Fluid power pumps & motors, nsk, administrative-record There are 188 Financial items covered, including: Total Sales, Pre-tax Profit, Interest Paid, Non-trading Income, Operating Profit, Depreciation: Structures, Depreciation: P + E, Depreciation: Misc., Total Depreciation, Trading Profit, Intangible Assets, Intermediate Assets, Fixed Assets: Structures, Fixed Assets: P + E, Fixed Assets: Misc., Total Fixed Assets, Capital Expenditure: Structures, Capital Expenditure: P + E, Capital Expenditure: Vehicles, Capital Expenditure: Data Processing, Capital Expenditure: Misc., Total Capital Expenditure, Retirements: Structures, Retirements: P + E, Retirements: Misc., Total Retirements, Total Fixed Assets, Finished Product Stocks, Work in Progress as Stocks, Materials as Stocks, Total Stocks / Inventory, Debtors, Total Maintenance Costs, Services Purchased, Misc. Current Assets, Total Current Assets, Total Assets, Creditors, Short Term Loans, Misc. Current Liabilities, Total Current Liabilities, Net Assets / Capital Employed, Shareholders Funds, Long Term Loans, Misc. Long Term Liabilities, Workers, Hours Worked, Total Employees, Raw Materials Cost, Finished Materials Cost, Fuel Cost, Electricity Cost, Total Input Supplies / Materials + Energy Costs, Payroll Costs, Wages, Director Remunerations, Employee Benefits, Employee Commissions, Total Employees Remunerations, Sub Contractors, Rental & Leasing: Structures, Rental & Leasing: P + E, Total Rental & Leasing Costs, Maintenance: Structures, Maintenance: P + E, Communications Costs, Misc. Expenses, Sales Personnel Variable Costs, Sales Expenses + Costs, Sales Materials Costs, Total Sales Costs, Distribution Fixed + Variable Costs, Premises Fixed Costs, Premises Variable Costs, Physical Handling Fixed + Variable Costs, Physical Process Fixed + Variable Costs, Total Distribution Costs, Correspondence Costs, Media Advertising Costs, Advertising Materials Costs, POS & Display Costs, Events Costs, Total Advertising Costs, Product Handling Costs, Product Support Costs, Product Service Costs, Customer Problem Solving Costs, Total After-Sales Costs, Total Marketing Costs, New Technology Expenditure, New Production Technology Expenditure, Total Research + Development Expenditure, Total Operational & Process Costs, Debtors + Agreed Terms, Un-recoverable Debts. /.. etc.
Author: Patrick J. Klette Publisher: Atp American Technical Publishers ISBN: 9780826936349 Category : Fluid power technology Languages : en Pages : 0
Book Description
Fluid Power Systems is a text/workbook that covers topics specifically relating to the design, application, and maintenance of hydraulic and pneumatic systems. This new edition has been redesigned and includes expanded content on hydraulic pumps, fluid conductors, connectors, and means of transmission. The text/workbook addresses fluid power systems, components, and devices specific to industrial, commercial, and mobile power equipment applications such as pumps, valves, actuators, electrical controls, and troubleshooting techniques. Each component, device, or system is introduced with descriptions, operation, common applications, system examples, and operating characteristics. Schematic symbols are introduced throughout the textbook to assist the learner with schematic diagram comprehension.The included FluidSIM� 4.2 Student Version simulation software provides the learner with an added tool to create, build, and troubleshoot hydraulic circuits in the form of specific activities in the text/workbook. Instructors can also create their own activities.
Author: Samuel Kärnell
Author: Samuel Kärnell
Author: Charles S. Hedges
Author: Dudley A. Pease
Author: Editorial Datagroup
Author: 
Author: James A. Sullivan
Author: Patrick J. Klette
Author: D. McCloy
Author: Pacific Coast Electrical Bureau
Author: American National Standards Institute