Criteria

Text:
Content:
Display:

Results

Viewing 70801 to 70830 of 102048
Technical Paper
1987-04-01
Robert H. Anderson, Howard Schwerdlin
When choosing a power transmission coupling for a particular application, several areas of concern must be attended to. Among these are the operative speed and horsepower, misalignment between driver and driven equipment and environmental conditions. However, neither the coupling nor any component used in the application can be considered safe from damage until an analysis of torsional vibration has been carefully completed. In the following paper, case studies of torsionally and environmentally induced failures will be presented. By presenting case histories, along with system models and the results of onsite measurements, it is hoped that the importance of these design steps are not overlooked. Additionally, causes and solutions for spline shaft wear will be discussed.
Technical Paper
1987-04-01
Richard A. Lowe
A new hydraulipowered auger attachment designed for backhoe loaders is being developed by Lowe Manufacturing Company, incorporated. The auger unit will utilize a new generation hydraulic motor with builin pressure relief, as well as refinements in critical power transfer components and digging wear parts.
Technical Paper
1987-04-01
Michael A. Roussin
Caterpillar has introduced a new concept that shatters previous ripping limitations. The D9L Impact Ripper has extended the ripping capacity and productivity of the standard ripper tractor in heavy construcion, mining, and quarry applications. This paper describes the design objectives, development program, component selection, and the demonstrated productivity of the D9L Impact Ripper.
Technical Paper
1987-04-01
Don J. Gerhardt, Thomas A. Sills
This paper describes the design of a new microprocessor control system suitable for the control of a wide variety of diesel powered equipment. An application for controlling a diesel engine and centrifugal compressor for aircraft ground support equipment is discussed. The equipment supplies 400 Hz electrical power and compressed air for turbine engine starting and aircraft air conditioning. The Digital Electronic Control Unit (DECU) has a dual 16 bit microprocessor capability with a built in power supply, EMI filters and analog interface circuits. The DECU controls the engine fuel control valve, compressor variable inlet guide vanes, compressor variable angle diffuser position and air dump valve. The DECU can be configured to monitor up to .32 analog input channels and 32 digital channels. Four analog output, 32 digital output, and two RS-423 serial channels can be installed. EEPROM memory is used to store calibration data and to record fault history.
Technical Paper
1987-04-01
Daryl Gerke
As microprocessors continue to move into increasingly hostile applications, such as engine ignition systems, their susceptibility to noise also increases. The traditional approaches of “noise avoidance”, such as filtering, grounding, shielding may not be enough, and a second line of defenses may be needed. The system must be designed to be “noise tolerant” as well. This paper discusses a number of simple, yet effective, noise tolerant design techniques that may be applied to minimize the consequences of noise in microprocessor based systems.
Technical Paper
1987-04-01
Hugh C. Morris
A personal computer program is used to predict pressures and cylinder displacements in a typical loader bucket regenerative circuit. This interactive, graphically oriented program expedites the simulation and provides accurate circuit design in less time.
Technical Paper
1987-04-01
H.C. Vergeer, A. Lawson, T.C. Burnett, J.E. Sauerteig
A heavy-duty methanol engine utilizing a glow plug ignition system has been developed by Kloeckner-Humboldt-Deutz (KHD). This engine was tested to determine the performance and emissions characteristics prior to installation in a load-haul-dump (LHD) mining machine. The engine is now undergoing field trials at an operating mine in Canada. Results show that the methanol engine produced low exhaust emissions relative to the diesel-powered counterpart. Low particulate emissions and the absence of sulphur compounds were confirmed. This paper describes the engine, presents engine test results and provides an update on the field trials at the underground mines.
Technical Paper
1987-04-01
M. A. Groeneweg, R. Ahuja, R. F. Pfeiffer, T. N. Bezue
The drive to increase engineering productivity and decrease expensive hardware testing has resulted in the widespread application of the finite element method of structural analysis to diesel engine components. The scope of finite element analysis at Detroit Diesel Allison has been expanded far beyond the simple investigation of mechanically induced component stresses. The DDA developed, multipurpose finite element code, STRATA, has been used to analyze critical deflections, combustion induced thermal stresses, the probability of survival of ceramic structures and assembly parameters for ceramic-metal composite components. Finite element analysis has also been combined with the concept of factorial experiments to optimize new component designs. Specific examples of each application are discussed including piston kit, cylinder head, and valve gear components. Analytical results are interpreted and unique characteristics highlighted.
Technical Paper
1987-04-01
Peter Ward, Andrew Wakeling, Richard Weeks, Richard Russell
This paper describes the theoretical basis of SDRC's redesign package, Optisen. The use of the program is illustrated on the design of an excavator arm for stiffness and strength requirements.
Technical Paper
1987-04-01
William G. Wolber
THE USE OF MICROCOMPUTER CONTROLS, monitors and displays is now common in passenger cars and heavy agricultural equipment, and a great deal of effort is in process to develop similar systems for line-haul trucks and other applications of heavy-duty diesel engines. The service conditions for these latter applications are quite demanding, and significantly different from those in passenger cars. This paper is one of a series of SAE overview papers which the author has presented, documenting progress in the use of sensors for the control of vehicles, and especially for engine control. Specifically, this paper treats the robust sensors being applied to heavy-duty diesel engine control and other heavy-duty vehicle controls both on and off the road. How these sensors must differ from light vehicle control sensors and the concepts favored for pressure, temperature, speed, and timing measurement control are emphasized.
Technical Paper
1987-04-01
J. E. Morris
At present, combustion pressure sensors find widespread use in basic engine research and development. In the future they could provide the essential information for closed loop engine control (of both fuel mixture and ignition timing) and diagnostics. The quartz piezoelectric device is the most familiar; its concept has been extended to piezo-ceramic configurations seated beneath or inside a sparkplug. This paper presents preliminary results for a novel fiber-optic pressure sensor incorporated into a spark-plug. Head-stud transducers are also described.
Technical Paper
1987-04-01
David J. Olson, Charles R. Cornell
The tremendous pressures on the agricultural economy are forcing the use of electronic controls on agricultural equipment for greater operational efficiency. One of the first significant electronic controls on an agricultural tractor is for automatic actuation of the three-point hitch. This paper discusses the use of simulation in the development of such an electronic hitch control system.
Technical Paper
1987-04-01
Daniel E. Schafer
Textbooks on Statistical Process Control concepts have been available for over thirty years. However, the actual process of implementing SPC into American industry is just beginning. This paper describes a method of SPC implementation as developed and instituted by a heavy-duty transmission manufacturing plant. The process described goes far beyond applying a few control charts at troublesome machine operations. Statistical Process Control is structured into a “system” where inspection stations are no longer required at the end of production lines. Total responsibility of quality management now belongs to the Production organization.
Technical Paper
1987-04-01
John T. Sponzilli, Gordon H. Walter, Douglas V. Doane
Modern steelmaking practices enable closer control of chemical composition and hardenability, and some manufacturers are already specifying narrow hardenability limits. This paper reviews a recent activity of SAE Division 8, Carbon and Alloy Steel Hardenability, that developed restricted hardenability bands for a series of steels. The paper summarizes the need for restricted hardenability limits and the methods used to develop the new bands for the proposed SAE Standard J1868.
Technical Paper
1987-04-01
D. J. LINGENFELSER
Recently, two new families of steels, strand cast steel and microalloyed steel, have become available to engineers. This paper briefly describes these materials and shows how basic material tests, fatigue, fracture toughness, etc., can be used to evaluate potential applications of the materials and minimize full-scale component testing by increased understanding of basic material properties. Axial fatigue and fracture toughness tests are shown to be reliable indicators of material performance in components while Charpy V-notch energy is of little value for quantitative engineering analysis. An alternative impact test which more closely represents material behavior in components is discussed.
Technical Paper
1987-04-01
R. P. Schmidt, S. K. R. Iyengar
This paper describes the use of a micro-computer based data acquisition system for the collection and analysis of data from hydraulic component performance tests. The first part describes the overall computer hierarchy for the hydraulics test facilities. The data collection system which was designed to be portable, is used for the gathering of laboratory data from performance test stands. The second section covers the menu-driven programs and their usage by engineers and technicians. The options available include storing of test data, real-time display of hardware and software values, report generation and plotting. The various types of reports and plots available at the test stand provide a quick evaluation of the completed test. The last part describes the post processing options available to the user. The data can be readily transferred to other systems for further analysis. This includes an office-based system similar to the data acquisition system and larger main-frame systems. The data can be analyzed using spread sheets, and powerful plotting and statistical analysis packages.
Technical Paper
1987-04-01
Norman Miller, Darrell Socie, Stephen Downing
This paper traces the development of small field data acquisition and analysis systems. The impact of some significant recent advances in microelectronics on the design of field test systems is detailed. Techniques for the exploitation of newly developed microelectronic devices to design field test systems based on the concepts of distributed computing and modular hardware and software organization are discussed. The paper concludes with a description of a recently developed test system which embodies the newly available capabilities.
Technical Paper
1987-04-01
G.C. Grenier, D. J. Eisenlord, G. E. Leese
One of the most challenging aspects of a ground vehicle design project is the acquisition of fatigue service history for subsequent use in laboratory simulation tests and fatigue life analyses. This paper addresses the trade-offs involved in selecting data sampling rates for purposes of frequency domain characterization versus those for amplitude preservation in the time/cycle domain for fatigue life analysis. Fatigue life predictions on representative data are presented using tools designed to integrate the analysis and testing aspects of the mechanical engineering process.
Technical Paper
1987-04-01
G. Vander Molen, A. Akers
This paper describes the mode of operation of a control valve assembly that is used with a hydraulic pump. The operating system of the valve is modelled in a simplified form, and an analogy for hydraulic resonance of the pressure sensing system is presented. For the control valve investigated, air entrainment, length and diameter of the resonator neck, and valve mass produced the greatest shift in resonant frequency. Experimental work was conducted on the hydraulic system so that the resonance levels and frequencies could be measured and the accuracy of the theory verified. The results obtained make it possible to evaluate what changes to any of the variables considered would be most effective in driving the second harmonic frequency above the operating range.
Technical Paper
1987-04-01
Max P. Gassman, Gary L. Dostal
A need to vary the wheel base during operation exists for some mobile equipment. This need can be caused by legal considerations or the geometry of the haul road. To meet this need, we consider a hydraulically-operated device used as a fifth wheel. This type of unit is being built and installed on some tractor trailer combinations. Since the apparatus can be operated with the vehicle in motion, the system needs to be analyzed under various dynamic conditions. System pressure peaks and component operation is examined under a variety of conditions involving road surface irregularities and the effect of striking obstructions such as loading docks. Some recommendations for design improvement are included. The analysis was carried out with the use of the IBM-CSMP (Continuous System Modeling Program) (1).* The purpose of the work was to gain preliminary knowledge regarding probable operation of the apparatus.
Technical Paper
1987-04-01
Gary M. Stubblefield
Trapper Mine, a large western surface coal mine, began operating in 1976 and suffered from typical start-up inefficiencies including poor equipment availabilities and weak maintenance management practices. Throughout its brief history, a continuous effort to improve this situation has been ongoing. This paper describes the corrective action taken to-date and hints at what might be in the high-tech future of mine maintenance.
Technical Paper
1987-04-01
David J. Arnett
Recently, significant focus and development effort has been dedicated toward in-vehicle networking. This effort includes work on behalf of the American Trucking Association (ATA), the Society of Automotive Engineers (SAE), the International Standards Organization (ISO), and independent developments by automotive and semiconductor manufacturers. In-vehicle networking extends, as a result, beyond passenger cars into heavy truck, military, and construction vehicles. In the course of these developments, the benefits of networking have been examined and networking is perceived as having significant benefits, resulting in production and custom development [1, 2, 3]. The Controller Area Network (CAN) is a high-performance serial communication solution which has been designed to meet the requirements for the broad range of applications and has now progressed from a specification to a product. This paper will detail the CAN solution and the CAN products designed to support in-vehicle networking needs in the 80's and 90's.
Technical Paper
1987-04-01
Harold F. Shultz
This paper discusses design objectives for a fire suppression system, the steps in the design and testing of the system, and the production and support of the system for the final user.
Technical Paper
1987-04-01
Barry A. Stewart
The National Fire Protection Association (NFPA) is internationally recognized for its development and publication of life and property fire protection standards. This paper will describe the organizational structure of the NFPA and the process through which these consensus standards are developed. Reference is made to an actual standard on diesel equipment and diesel fuel in underground mines. Included are the necessary steps leading to membership approval and NFPA publication.
Technical Paper
1987-04-01
Danforth K. Heiple, G. Edwin Burks Lecture
The right answer to the wrong question has little, if any, value; whereas the wrong answer to the right question may very well establish a proper direction for continuing effort and resources. This paper examines the engineers' involvement in the question and answer process, citing examples relative to broad human experience and to the construction and industrial machinery industry.
Technical Paper
1987-04-01
Paul D. Tomlingson
Abstract An effective maintenance program ensures the adequate availability of production equipment, in turn, this availability enables production to maximize utilization and successfully meet production targets. An overall production strategy is necessary to draw all departments toward this common effort. Only then will production targets be met. From the maintenance view this means that production must comply with PM and repair schedules. Purchasing must supply parts and materials on time. Mine engineering must not overwhelm maintenance with non-vital construction. Accounting must provide correct, timely cost information - etc. This strategy - its content, effectiveness and enforcement is the responsibility of the mine manager…. his alone. This paper describes a successful approach to maintenance within this strategy.
Technical Paper
1987-04-01
Bernard R. Barnaski
Efficient use of computer data bases and programs is effective in fan design and performance predictions, test data reduction, and information access. Data bases must be capable of easy access by users. Programs must be written with the ultimate users' needs in mind. Data bases must be capable of constant updating to be effective.
Technical Paper
1987-04-01
John E. Mahoney
Several new, patented devices have recently been introduced to protect the equipment investment. Some of them are on board the Hitachi hydraulic excavators, and some are carried to the machine by the service personnel at usual service intervals. This paper will discuss these new devices as management tools.
Technical Paper
1987-04-01
Steven Stiling
Maintenance activities have always been important, but they are becoming increasingly critical for a number of reasons. To meet the unique needs of the maintenance environment. Arthur Andersen & Co. has developed an economic and flexible system - the Micro Maintenance Management System (M3S). M3S is a microcomputer based system that offers many significant benefits including: Availability right at the shop floor level, through the use of a microcomputer. “Local Area Networking”: Multiple users may access the system simultaneously. Flexible: Can be tailored to meet the needs of specific users. Automatic prompting of special maintenance requirements. Management reporting on key performance factors and activity measure. M3S consists of three closely related modules: Work Order Planning and Tracking Stores/Material Control Equipment Monitoring
Technical Paper
1987-04-01
J. A. McCarty, J. H. Emme
Significant developments in moldable noise reduction materials will allow design engineers of off-highway equipment to incorporate molded parts concepts into their design schemes for both the cab and engine compartments as their use of contoured shapes continues to increase. When properly designed, and used in conjunction with complementary treatments which have been carefully selected on the basis of proven acoustic test criteria, molded sound barriers and sound absorption parts are more cost effective than the oft seen overkill of conventional materials.