This SAE Standard describes a method for measuring the weighted sound pressure levels at prescribed microphone positions in the proximity of a device or machine for outdoor use, in order to determine compliance with noise limits. The A-weighted sound power level of the source is calculated from the measured values. NOTES:1. When nine or more microphone positions are prescribed in the proximity of the source (as in Section 7), the A-weighted sound power levels determined in accordance with this document tend to result in standard deviations less than approximately 2 dB, provided that the spectrum does not contain pronounced discrete frequencies; if it does, the magnitude of the uncertainties will be larger and no general rules for the magnitude of the uncertainties can be given. These standard deviations reflect the cumulative effects of all causes of measurement uncertainty, excluding variations in the sound power level from machine to machine or from test to test, which may be caused, for example, by changes in the mounting or operating conditions of the source. 2. For measurements made using a hemispherical measurement suface, the directivity index of the source may be calculated according to the description of appendix B. 3. Measurement of A-weighted sound pressure levels at the operator's postion(s) is not described in this document. 4. The results of noise measurements made according to this document are obtained under prescribed conditions and iwll not necessarily correspond to the noise experienced from the equipment when it is in operation on a construction site.

Reference Data for Engineers is the most respected, reliable, and indispensable reference tool for technical professionals around the globe. Written by professionals for professionals, this book is a complete reference for engineers, covering a broad range of topics. It is the combined effort of 96 engineers, scientists, educators, and other recognized specialists in the fields of electronics, radio, computer, and communications technology. By providing an abundance of information on essential, need-to-know topics without heavy emphasis on complicated mathematics, Reference Data for Engineers is an absolute "must-have" for every engineer who requires comprehensive electrical, electronics, and communications data at his or her fingertips. Featured in the Ninth Edition is updated coverage on intellectual property and patents, probability and design, antennas, power electronics, rectifiers, power supplies, and properties of materials. Useful information on units, constants and conversion factors, active filter design, antennas, integrated circuits, surface acoustic wave design, and digital signal processing is also included. The Ninth Edition also offers new knowledge in the fields of satellite technology, space communication, microwave science, telecommunication, global positioning systems, frequency data, and radar. * Widely acclaimed as the most practical reference ever published for a wide range of electronics and computer professionals, from technicians through post-graduate engineers. * Provides a great way to learn or review the basics of various technologies, with a minimum of tables, equations, and other heavy math.

The discipline of instrumentation has grown appreciably in recent years because of advances in sensor technology and in the interconnectivity of sensors, computers and control systems. This 4e of the Instrumentation Reference Book embraces the equipment and systems used to detect, track and store data related to physical, chemical, electrical, thermal and mechanical properties of materials, systems and operations. While traditionally a key area within mechanical and industrial engineering, understanding this greater and more complex use of sensing and monitoring controls and systems is essential for a wide variety of engineering areas--from manufacturing to chemical processing to aerospace operations to even the everyday automobile. In turn, this has meant that the automation of manufacturing, process industries, and even building and infrastructure construction has been improved dramatically. And now with remote wireless instrumentation, heretofore inaccessible or widely dispersed operations and procedures can be automatically monitored and controlled. This already well-established reference work will reflect these dramatic changes with improved and expanded coverage of the traditional domains of instrumentation as well as the cutting-edge areas of digital integration of complex sensor/control systems. Thoroughly revised, with up-to-date coverage of wireless sensors and systems, as well as nanotechnologies role in the evolution of sensor technology Latest information on new sensor equipment, new measurement standards, and new software for embedded control systems, networking and automated control Three entirely new sections on Controllers, Actuators and Final Control Elements; Manufacturing Execution Systems; and Automation Knowledge Base Up-dated and expanded references and critical standards

Noise and Vibration Control Engineering: Principles and Applications, Second Edition is the updated revision of the classic reference containing the most important noise control design information in a single volume of manageable size. Specific content updates include completely revised material on noise and vibration standards, updated information on active noise/vibration control, and the applications of these topics to heating, ventilating, and air conditioning.

This Standard specifies the safety requirements for the design, manufacture, use and maintenance of drill rigs, mainly involving the important operational safety and ergonomics of drill rigs. This Standard applies to drill rigs, including casing, for surface and underground hole formation in building, tunnels, railways, roads, hydropower stations and water conservancy projects. Note: This Standard includes the major hazards of drill rigs under the conditions of intended use and foreseeable by the manufacturer. However, this Standard does not include all mechanical, electrical, hydraulic, pneumatic and other device hazards, nor does it include all hazards involved in general standards. Hazards not included in this Standard shall be subject to the relevant provisions of GB/T 15706.1 and GB/T 15706.2. The drill rigs to which this Standard applies mainly has the following characteristics: a) There are three types of drilling methods: impact, rotary and rotary impact; b) Chassis types include fixed, towed and self-propelled; c) Mainly used to form pile holes, anchor holes, blasting holes and drainage holes, etc. Specifically including the following models: ● Drill rigs for pile formation, mainly including impact drill rigs, rotary drill rigs, long spiral drill rigs, forward/reverse circulation drill rigs, swing/rotary casing drill rigs, pile top drill rigs, down-the-hole hammer rock drill rigs, etc.; ● Drill rigs for anchoring, mainly rotary and rotary impact drill rigs; ● Drill rigs for blasting holes, mainly including rock drills (cars), down-the-hole drills, rotary drills, etc.; ● Drill rigs for other purposes, including rotary spindle drill rigs, rotary and rotary impact drill rigs for surface/underground drilling, forward/reverse circulation drill rigs, horizontal directional drill rigs, etc.; GB 26545-2011 www.ChineseStandard.net  Buy True-PDF  Auto-delivery. Page 6 of 85 d) Casing or drilling fluid may be used to stabilize the drill hole. Self-propelled drill r...