rambomenaa كبير مهندسين
عدد المساهمات : 2041 التقييم : 3379 تاريخ التسجيل : 21/01/2012 العمر : 47 الدولة : مصر العمل : مدير الصيانة بشركة تصنيع ورق الجامعة : حلوان
| موضوع: كتاب Solving Tribology Problems in Rotating Machines السبت 24 نوفمبر 2012, 8:31 pm | |
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أخوانى فى الله أحضرت لكم كتاب Solving Tribology Problems in Rotating Machines H. Prashad
ويتناول الموضوعات الأتية :
Contents Preface xiii About the author xv 1 Reliability analysis of rolling-element bearings 1 1.1 A general review 1 1.2 Introduction 1 1.3 Detection of bearing malfunction and determination of defect frequencies 2 1.4 Resonant frequencies 3 1.5 Experimental procedure 3 1.6 Instrumentation details and techniques 4 1.7 Determination of defect frequencies and energy levels 7 1.8 Results and discussion 9 1.9 Conclusions and recommendations 19 1.10 References 20 1.11 Nomenclature 20 2 Functional performance of rolling-element bearings for acceptance in routine applications 22 2.1 A general review 22 2.2 Introduction 22 2.3 Bearing test philosophy 23 2.4 Bearing test machine 25 2.5 Experimental procedure 26 2.6 Data deduction 27 2.7 Results and discussion 30 2.8 Overall vibration levels of bearings 37 2.9 Predicted life of bearings 37 2.10 Comparison of performance of bearings 382.11 Conclusions 38 2.12 References 39 3 Cage and roller slip of rolling-element bearings 40 3.1 A general review 40 3.2 Introduction 40 3.3 Characteristic defect frequencies 41 3.4 Experimental procedure 41 3.5 Spectral analysis technique 42 3.6 Determination of defect frequencies and energy levels 43 3.7 Results and discussion 44 3.8 Comparison of bearings 51 3.9 Conclusions 52 3.10 References 53 3.11 Appendix 53 3.12 Nomenclature 54 4 Diagnosis and cause analysis of rolling-element bearings failure in electric power equipment 56 4.1 A general review 56 4.2 Introduction 56 4.3 Bearing arrangement and nature of bearing failure 57 4.4 Investigations, observation of failures and data collection 57 4.5 Results and discussion 61 4.6 Conclusions 64 4.7 References 65 5 Localized electrical current in rolling-element bearings 67 5.1 A general review 67 5.2 Introduction 67 5.3 Bearing arrangement and the nature of bearing failure 69 5.4 Investigations, observations and data collection 70 5.5 Theoretical model and approach to determine the flow of localized current in a bearing 72 5.6 Field strength on track surfaces of races and rolling-elements 75 5.7 Magnetic flux density 75 5.8 Determination of time span for the appearance of flutes on track surfaces 76 5.9 Data deduction 76 5.10 Results and discussion 77 vi Contents5.11 Conclusions 80 5.12 References 81 5.13 Nomenclature 82 6 Response and performance of a rolling-element bearing under the influence of an electric current 84 6.1 A general review 84 6.2 Introduction 84 6.3 Behaviour of grease in non-insulated bearings 86 6.4 Effect of current on formation of corrugated patterns on the roller track of races of roller bearings 90 6.5 Effect of current leakage on electro-adhesion forces in rolling friction and magnetic flux density distribution on bearing surfaces 92 6.6 Effect of operating parameters on the threshold voltages and impedance response of non-insulated rolling-element bearings 94 6.7 Impedance, capacitance and charge accumulation on roller bearings 95 6.8 Contact temperature, contact stresses and slip bands initiation on roller track of races 96 6.9 Effects of instantaneous charge leakage on roller tracks of roller bearings lubricated with high-resistivity lubricants 98 6.10 Capacitive effects of roller bearings on repeated starts and stops of a machine 99 6.11 Mechanism of bearing failures 100 6.12 Conclusion 102 6.13 References 102 6.14 Nomenclature 103 7 Effect of oil grades and clearance ratios on the reliability of cylindrical hydrodynamic bearings 106 7.1 A general review 106 7.2 Introduction 106 7.3 Background 107 7.4 Theoretical 109 7.5 Evaluation of viscosity coefficients 110 7.6 Determination of viscosity integral 112 7.7 Assessment of bearing performance 114 7.8 Effect of oil grades on temperature rise and safe loadcarrying capacity of bearings 116 Contents viiviii Contents 7.9 Bearing turbulence and transition speed 117 7.10 Results and discussion 120 7.11 Conclusions and recommendations 126 7.12 References 128 7.13 Nomenclature 128 8 Spherical seating of hydrodynamic journal bearings 130 8.1 A general review 130 8.2 Introduction 130 8.3 Theoretical basis of the simplified design methodology 131 8.4 Evaluation of minimum values of constant of moment of friction and optimum values of the design parameters of spherical seating 133 8.5 Functional nomographs for evaluation of optimum values for spherical seating design parameters 134 8.6 Guidelines for choosing the optimum values for spherical seating design parameters 136 8.7 Conclusions and recommendations 136 8.8 References 137 8.9 Nomenclature 137 9 Life estimation of turbine oils: a methodology and criterion for acceptance or rejection 139 9.1 A general review 139 9.2 Introduction 139 9.3 Experimental investigations 140 9.4 Data deduction 141 9.5 Results and discussion 142 9.6 Conclusions and recommendations 147 9.7 References 148 10 Axial force on motor bearings: a tool for performance evaluation 149 10.1 A general review 149 10.2 Introduction 149 10.3 Axial force measurement technique 150 10.4 Experimental determination of axial force 152 10.5 Results and discussion 152 10.6 Conclusions and future studies 153 10.7 Bibliography 15311 An analysis of the progressive increase in vibration of a large synchronous electric motor 154 11.1 A general review 154 11.2 Introduction 154 11.3 Possible sources of vibration 155 11.4 Diagnosis of causes of vibrations 156 11.5 System design, bearing assembly and characteristic features of the synchronous motor under investigation 157 11.6 Investigations and analysis 158 11.7 Results and discussion 161 11.8 Conclusions and recommendations 163 11.9 References 164 12 A study of the causes of failure of rolling-element bearings in alternators 165 12.1 A general review 165 12.2 Introduction 165 12.3 Design features of the alternators 166 12.4 The nature of bearing failure 166 12.5 Data collection and investigations 167 12.6 Causes of shaft voltage and flow of current through bearings 171 12.7 Results and discussion 172 12.8 Conclusions and recommendations 175 12.9 References 175 13 The diagnosis of the cause of a bearing problem in a synchronous condenser 177 13.1 A general review 177 13.2 Introduction 177 13.3 Technical details of the synchronous condenser 178 13.4 Experimental procedure 178 13.5 Measurement obtained 179 13.6 Theoretical 180 13.7 Comparison of theoretical and experimental data 183 13.8 Results and discussion 184 13.9 Conclusions and recommendations 185 13.10 References 185 13.11 Nomenclature 186 Contents ix14 The cause of noise at the top bearings of vertical pump-motor sets 187 14.1 Introduction 187 14.2 Sump layout and construction 187 14.3 System layout 188 14.4 System behaviour 189 14.5 Factors causing the unusual system behaviour 191 14.6 Vibration spectra and analysis 191 14.7 Results and discussion 193 14.8 Design of the bearing used and its significance 199 14.9 Explanation of the cause of noise at the motor top bearing 200 14.10 Conclusions and recommendations 200 14.11 Bibliography 202 15 Modifications to the design and bearings of horizontal axis windmills used for pumping water, to achieve trouble-free, reliable operation 203 15.1 A general review 203 15.2 Introduction 203 15.3 Design features 204 15.4 Operational philosophy 204 15.5 Transmission system 205 15.6 Bearings and performance of the reciprocating pump 205 15.7 Recommendations 209 15.8 Conclusions 213 15.9 References 213 16 Magnetic suspension bearings for AC energy meters 214 16.1 A general review 214 16.2 Introduction 214 16.3 Design considerations 216 16.4 Mechanical requirements 220 16.5 Typical construction 221 16.6 Frictional torque studies 222 16.7 Conclusions and discussion 226 16.8 Bibliography 227 17 A new generation of rolling-element bearing with an outline of its performance advantages 228 17.1 A general review 228 17.2 Introduction 228 x Contents17.3 Basic concept and principle of operation of DDHPB 229 17.4 Theoretical analysis 230 17.5 Theory behind performance evaluation of bearings 232 17.6 Design and test conditions of DDHPB 233 17.7 Bearing test set-up and experimental details for testing DDHPB vis-à-vis conventional bearings 235 17.8 Data deduction 235 17.9 Results and discussion 237 17.10 Brief summary of the published research on DDHPB 239 17.11 Conclusions 239 17.12 References 240 17.13 Nomenclature 241 Index 243
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| موضوع: رد: كتاب Solving Tribology Problems in Rotating Machines السبت 24 نوفمبر 2012, 8:44 pm | |
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